Display device, receiving device and method, and computer-readable storage medium

Abstract

The present invention relates to a display device and method, a receiving device and method, and a computer-readable storage medium. The purpose of the present invention is to transmit HDR image data between devices in a good manner. A sending device (source device) sends HDR image data to a receiving device (sink device) via a channel. In this process, the sending device sends transmission format information and / or gamma correction information of the HDR image data to the receiving device via the channel. The receiving device performs processing (decoding processing, gamma correction processing, etc.) on the received HDR image data based on the received transmission format information and / or gamma correction information. For example, the sending device receives information on the transmission format and / or gamma correction format compatible with the receiving device from the receiving device, and selects a format compatible with the receiving device for use.

Description

[0001] This application is a divisional application of the invention patent application with application number 201480033700.9, application date June 16, 2014, and titled "Transmitting device, method for transmitting high dynamic range image data, receiving device, method for receiving high dynamic range image data, and program". More specifically, this divisional application is a further divisional application based on the divisional application with application number 201910416206.5, application date June 16, 2014, and titled "Display device, receiving device and method, and computer-readable storage medium". Technical Field

[0002] The present invention relates to a sending device, a method for sending high dynamic range image data, a receiving device, a method for receiving high dynamic range image data and a program, and more specifically to a sending device for sending high dynamic range image data for displaying high dynamic range images, etc. Background Art

[0003] In recent years, for example, the High Definition Multimedia Interface (HDMI) has become popular as a communication interface through which a digital picture signal (i.e., an uncompressed (baseband) picture signal (image data) and a digital voice signal (voice data) associated with the picture signal) is transmitted at high speed from a digital diverse disk (DVD) recorder, a set-top box, or other audio-visual (AV) source to a television receiver, a projector, or other display. The HDMI specification is described in detail in NPL 1, for example.

[0004] For example, consider an AV system or the like in which a disk player as a source device and a television receiver as a sync device are HDMI-connected to each other, but based on the image data recorded on the disk player at a resolution of, for example, 100 cd / m 2 The specification of the maximum brightness displayed on the display device assumes that the brightness is adjusted by the brightness.

[0005] On the other hand, with the development of technology, the maximum brightness of display devices has been extended to 1000cd / m 2 , exceeding the 100cd / m 2 , and the ability of the display device to perform high brightness output is not well utilized.

[0006] Therefore, High Dynamic Range (HDR) processing is proposed, in which a luminance dynamic range processing is performed so that a brightness of more than 100 cd / m 2The invention relates to processing of image data with maximum brightness of a certain image, and in practice has been extended to the capture and post-processing of still images. For example, in PTL 1, a proposal for a method for recording HDR image data and processing HDR image data is proposed.

[0007] Reference List

[0008] Non-patent literature

[0009] NPL 1: High-Definition Multimedia Interface Specification Version 1.4b, October 11, 2011

[0010] Patent Literature

[0011] PTL 1: Japanese Unexamined Patent Application Publication No. 2005-352482 Summary of the invention

[0012] Technical issues

[0013] There has been no proposal in the prior art for a transmission specification for a high dynamic range in a digital interface such as HDMI.

[0014] An object of the present technology is to enable transmission of high dynamic range image data between devices.

[0015] Solutions to the Problem

[0016] The concept of the present technology lies in: a sending device, comprising: a data sending unit, which sends high dynamic range image data to an external device via a transmission path; and an information sending unit, which sends information on the transmission method and / or gamma correction information of the high dynamic range image data sent in the data sending unit to the external device via the transmission path.

[0017] In the present technology, the data transmission unit transmits the image data with high dynamic range to the external device via the transmission path. For example, the data transmission unit may transmit the image data with high dynamic range to the external device via the transmission path using a differential signal.

[0018] For example, the high dynamic range image data may include first data and second data, and the data transmission unit may configure the first data and the second data into a picture format specified for a stereoscopic image, and may transmit the picture format to an external device via a transmission path. In addition, for example, the high dynamic range image data may include first data and second data, and the data transmission unit may transmit the first data as a first frame image to an external device via a transmission path, and transmit the second data as a second frame image to an external device via a transmission path.

[0019] For example, the high dynamic range image data may include first data and second data, and the first data is the low-order 8-bit data of the high dynamic range image data and the second data may be the high-order bit data of the high dynamic range image data, or the first data may be the high-order 8-bit data of the high dynamic range image data and the second data may be the low-order bit data of the high dynamic range image data.

[0020] The information sending unit sends information about the transmission method of the high dynamic range image data sent in the data sending unit and / or information about the gamma correction to an external device via a transmission path. For example, the information sending unit may insert the information about the transmission method of the high dynamic range image data sent in the data sending unit and / or information about the gamma correction during a blank period of the high dynamic range image data, thereby sending the inserted information to the external device. In addition, the information sending unit may send information about the transmission method of the high dynamic range image data sent in the data sending unit and / or information about the gamma correction to an external device via a control data line constituting the transmission path.

[0021] In addition, for example, the information transmission unit may transmit information of a transmission method of the high dynamic range image data transmitted in the data transmission unit and / or information of gamma correction to the external device via a bidirectional communication path configured according to a predetermined line of the transmission path. In this case, for example, the bidirectional communication path may be a pair of differential communication paths, and at least one of the differential communication paths in the pair may have a function of receiving a connection status notification from the external device using a DC bias potential.

[0022] In addition, for example, the information on the transmission method of the high dynamic range image data and the information on the gamma correction sent in the data sending unit may include at least one of the following: information on the maximum white level at 100% exceeding the high dynamic range image data, the bit value when expressed at the black level, the bit value when expressed at 100% white level, a flag indicating whether processing for the high dynamic range is performed, the brightness level of the assumed receiving device at 100% white level, the brightness input level required for increasing the brightness of the high dynamic range image, and the increased brightness output level required for increasing the brightness of the high dynamic range image.

[0023] In the present technology, in this way, the image data of the high dynamic range is transmitted to the external device via the transmission path, and the information of the transmission method of the image data of the high dynamic range and / or the information of the gamma correction is transmitted to the external device via the same transmission path. For this reason, in the external device, for example, it is possible to easily understand which transmission method and which gamma correction method are used to transmit the image data of the high dynamic range, so that the transmission of the image data of the high dynamic range can be performed well.

[0024] Moreover, in the present technology, for example, it may also include: an information receiving unit, which receives information about a transmission method and / or a gamma correction method for high dynamic range image data that can be supported by the external device and sent from the external device via a transmission path; and a method selection unit, which selects a predetermined transmission method and / or a predetermined gamma correction method from the transmission method and / or gamma correction method for high dynamic range image data that can be supported by the external device based on the information about the transmission method and / or the information about the gamma correction method received in the information receiving unit, and the data sending unit can send the high dynamic range image data according to the transmission method and / or gamma correction method selected in the method selection unit to the external device via the transmission path.

[0025] In this case, the external device can well support the transmission method and / or gamma correction method of the image data with a high dynamic range transmitted to the external device. For this reason, the transmission of the image data with a high dynamic range can be well performed.

[0026] In addition, another concept of the present technology is: a receiving device, comprising: a data receiving unit, which receives high dynamic range image data for displaying a high dynamic range image from an external device via a transmission path; an information receiving unit, which receives information on a transmission method and / or gamma correction information of the high dynamic range image data received in the data receiving unit from the external device; and a data processing unit, which processes the high dynamic range image data received in the data receiving unit based on the information on the transmission method and / or gamma correction information received in the information receiving unit.

[0027] In the present technology, the data receiving unit receives high dynamic range image data for displaying a high dynamic range image from an external device via a transmission path. For example, the data receiving unit may receive the high dynamic range image data from the external device via a transmission path using a differential signal.

[0028] For example, the high dynamic range image data may include first data and second data, and the data sending and receiving unit may receive the first data and second data configured as a picture format specified for stereoscopic images from an external device via a transmission path. In addition, for example, the high dynamic range image data may include first data and second data, and the data sending and receiving unit may receive a first frame image configured according to the first data and a second frame image configured according to the second data from an external device via a transmission path.

[0029] For example, the high dynamic range image data may include first data and second data, and the first data may be low-order 8-bit data of the high dynamic range image and the second data may be high-order bit data of the high dynamic range image, or the first data may be high-order 8-bit data of the high dynamic range image data and the second data may be low-order bit data of the high dynamic range image data.

[0030] The information receiving unit receives information of a transmission method of the high dynamic range image data received in the data receiving unit and / or information of gamma correction from an external device. Then, the data processing unit processes the high dynamic range image data received in the data receiving unit based on the information of the transmission method and / or information of gamma correction received in the information receiving unit.

[0031] For example, the information receiving unit can extract the information of the transmission method of the high dynamic range image data and / or the information of the gamma correction from the blank period of the high dynamic range image data received in the data receiving unit. In addition, for example, the information receiving unit can receive the information of the transmission method of the high dynamic range image data received in the data receiving unit and / or the information of the gamma correction from an external device via a control data line constituting a transmission path.

[0032] In addition, for example, the information receiving unit may receive information on the transmission method of the high dynamic range image data received in the data receiving unit and / or information on gamma correction from the external device via a bidirectional communication path configured according to a predetermined line of the transmission path. Then, in this case, the bidirectional communication path may be a pair of differential communication paths, and at least one of the differential communication paths in the pair may have a function of notifying the external device of the connection state using a DC bias potential.

[0033] In the present technology, in this way, high dynamic range image data sent from the transmitting side is processed based on information on the transmission method and / or information on gamma correction sent from the same transmitting side, so that appropriate processing can be easily performed on the received high dynamic range image data.

[0034] Furthermore, in the present technology, for example, a display control unit may be further included, and if the energy saving mode is selected, when the information receiving unit receives information on the transmission method of high dynamic range image data sent from an external device, the display unit performs a display on whether to cancel the energy saving mode. Therefore, it is possible to check the user's intention to confirm whether to cancel the energy saving mode.

[0035] In addition, in the present technology, for example, it may also include: an information storage unit, which stores information on a transmission method and / or a gamma correction method for image data with a high dynamic range that the information storage unit itself can support; and an information sending unit, which sends the information on the transmission method and / or the gamma correction method stored in the information storage unit to an external device via a transmission path. The information on the transmission method and / or the gamma correction method for image data with a high dynamic range that the information storage unit itself can support is sent to the sending side, so that the image data with a high dynamic range according to the transmission method and / or the gamma correction method that the information storage unit itself can support can be received from the sending side.

[0036] For example, at least one of information on the maximum brightness that can be displayed, information on the maximum increased brightness level at which processing for a high dynamic range can be performed, and a flag for prohibiting increase processing may also be stored in the information storage unit.

[0037] In addition, for example, a storage control unit may be included, which rewrites the flag for prohibiting the increase processing stored in the information storage unit to be invalid if the flag for prohibiting the increase processing is stored in the information storage unit and the energy saving mode is selected. In addition, for example, a storage control unit may be included, which rewrites the information of the maximum brightness that can be displayed and the information of the maximum increase brightness level that can be processed for the high dynamic range stored in the information storage unit if the information of the maximum brightness that can be displayed and the information of the maximum increase brightness level that can be processed for the high dynamic range are stored in the information storage unit and the energy saving mode is selected.

[0038] Advantageous Effects of the Invention

[0039] According to the present technology, it is possible to perform transmission of image data with a high dynamic range well between devices. Furthermore, the effects described in this specification are merely examples and are not limited to these examples, and there may be additional effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a block diagram showing a configuration example of an AV system according to the embodiment.

[0041] Figure 2 is a block diagram showing a configuration example of an HDMI transmission unit of a disc player and an HDMI reception unit of a television receiver.

[0042] Figure 3 is a diagram showing various transmission data periods when image data of 1920 rows of pixels and 1080 column lines are transmitted in TMDS channels # 0 , # 1 , and # 2 .

[0043] Figure 4 is a diagram for describing an 8-bit transmission method in the prior art.

[0044] Figure 5 It is a block diagram showing a configuration example of a disk player (source device) constituting an AV system.

[0045] Figure 6 : is a block diagram showing a configuration example of a television receiver (synchronizing device) constituting an AV system.

[0046] Figure 7 This is a diagram for describing a transmission method (1) for transmitting HDR image data using a deep color transmission format.

[0047] Figure 8 This is a diagram for describing a transmission method (2) for sending HDR image data using a stereoscopic picture format.

[0048] Fig. 9 This is a diagram for describing a transmission method (3) for sending HDR image data using a high frame rate picture format.

[0049] Fig.10 This is a diagram used to describe the HDR information (1) sent via a vendor specific information frame packet (Vendor Specific InfoFrame packet).

[0050] Fig.11 This is a diagram used to describe the HDR information (2) sent via the vendor-specific information frame data packet.

[0051] Fig.12 This is a diagram for describing the HDR information (3) sent via a vendor-specific information frame packet.

[0052] Fig.13 : is a diagram showing an example of the data structure of E-EDID stored in a sync device (television receiver).

[0053] Fig.14 : is a diagram showing an example of the data structure of the vendor-specific area of ​​E-EDID.

[0054] Fig.15 This is a diagram showing an example of the data structure of a vendor-specific infoframe packet of HDMI.

[0055] Fig.16This is a diagram showing an example of the data structure of the gamma correction method (1) transmitted via the vendor-specific infoframe packet.

[0056] Fig.17 This is a diagram showing an example of the data structure of the gamma correction method (2) transmitted via the vendor-specific infoframe packet.

[0057] Fig.18 This is a diagram showing an example of the data structure of the gamma correction method (3) transmitted using a vendor-specific information frame packet.

[0058] Fig.19 is a flowchart showing an example of processing performed by a source device (disc player) when connected to the device.

[0059] Fig. 20 is a flowchart showing an example of a process of selecting an HDR transmission method by a source device (disc player).

[0060] Fig.21 is a flowchart showing an example of a process of selecting an HDR transmission method by a source device (disc player) (continued).

[0061] Fig. 22 is a flowchart showing an example of processing performed when the energy saving mode is set in the sync device (television receiver).

[0062] Fig.23 : is a flowchart showing an example of processing for canceling the energy saving mode in the sync device (television receiver).

[0063] Fig.24 is a block diagram showing a configuration example of a DP system using a DP interface.

[0064] Fig.25 : is a diagram showing an example of a packet structure and the like in the case where transmission of information on a transmission method of HDR image data and information on a gamma correction method is performed through an AUX channel.

[0065] Fig.26 is a block diagram showing a configuration example of an MHL system using an MHL interface.

[0066] Fig. 27 is a diagram showing the CBUS data packet format.

[0067] Fig.28 A CBUS data packet format is shown in the case where transmission of information on a transmission method of HDR image data and information on gamma correction are performed via a CBUS / eCBUS line. DETAILED DESCRIPTION

[0068] The following describes an embodiment in which the present invention is put into practice (hereinafter referred to as an "embodiment"). Also, a description is provided as follows.

[0069] 1. Example

[0070] 2. Modification Example

[0071] <First Embodiment>

[0072] [Configuration example of AV system]

[0073] Figure 1 A configuration example of an audio-visual (AV) system 10 according to the embodiment is shown. The AV system 10 has a disk player 11 as a source device and a television receiver 12 as a sync device. The disk player 11 and the television receiver 12 are connected to each other via an HDMI cable 13 as a transmission path.

[0074] An HDMI terminal 11a to which an HDMI transmission unit (HDMITX) 11b and a high-speed bus interface (high-speed bus I / F) 11c are connected is provided to the disk player 11. An HDMI terminal 12a to which an HDMI reception unit (HDMIRX) 12b and a high-speed bus interface (high-speed bus I / F) 12c are connected is provided to the television receiver 12. One end of an HDMI cable 13 is connected to the HDMI terminal 11a of the disk player 11, and the other end of the HDMI cable 13 is connected to the HDMI terminal 12a of the television receiver 12.

[0075] exist Figure 1 In the AV system 10 shown, non-compressed image data reproduced in a disk player 11 and obtained are transmitted to a television receiver 12 via an HDMI cable 13, and an image derived from the image data transmitted from the disk player 11 is displayed on the television receiver 12. Furthermore, non-compressed image data reproduced in the disk player 11 and obtained are transmitted to the television receiver 12 via the HDMI cable 13, and audio derived from voice data transmitted from the disk player 11 is output from the television receiver 12.

[0076] Figure 2 Shows Figure 1 An example of a configuration of an HDMI transmission unit 11b of a disk player 11 and an HDMI reception unit 12b of a television receiver 12 in an AV system 10 of FIG. Figure 3), that is, during a period from one vertical synchronization signal to the next vertical synchronization signal excluding the horizontal blank period 15 and the vertical blank period 16, the HDMI transmitting unit 11b transmits a differential signal corresponding to the non-compressed pixel data of an image of one screen to the HDMI receiving unit 12b in one direction. In addition, during the horizontal blank period 15 and the vertical blank period 16, the HDMI transmitting unit 11b transmits a differential signal corresponding to voice data or control data associated with at least an image, other auxiliary data items, etc. to the HDMI receiving unit 12b in one direction in a plurality of channels.

[0077] That is, the HDMI transmitting unit 11b has an HDMI transmitter 21. For example, the HDMI transmitter 21 converts the non-compressed image pixel data into corresponding differential signals, and transmits the conversion results serially in a plurality of channels (three transition minimized differential signaling (TMDS) channels #0, #1, and #2) in one direction to the HDMI receiving unit 12b.

[0078] In addition, the transmitter 21 converts voice data associated with the non-compressed image, required control data, other auxiliary data items, etc. into corresponding differential signals, and transmits the conversion results serially in three TMDS channels #0, #1, and #2 in one direction to the HDMI receiving unit 12b. In addition, the transmitter 21 transmits a pixel clock synchronized with the pixel data transmitted in the three TMDS channels #0, #1, and #2 to the HDMI receiving unit 12b in the TMDS clock channel. Here, 10-bit pixel data is transmitted in one clock, which is a pixel clock in one TMDS channel #i (i=0, 1, 2).

[0079] During the event video 14 (reference Figure 3 ), the HDMI receiving unit 12b receives the differential signal corresponding to the pixel data transmitted in one direction from the HDMI transmitting unit 11b in multiple channels. In addition, during the horizontal blanking period 15 (reference Figure 3 ) or vertical blanking period 16 (reference Figure 3 ), the HDMI receiving unit 12b receives, in a plurality of channels, differential signals received in one direction from the HDMI transmitting unit 11b and corresponding to voice data or control data.

[0080] That is, the HDMI receiving unit 12b has an HDMI receiver 22. In TMDS channels #0, #1, and #2, the receiver 22 receives a differential signal corresponding to pixel data and a differential signal corresponding to voice data or control data received in one direction from the HDMI transmitting unit 11b connected via the HDMI cable 13. At this time, the differential signal is synchronized with a pixel clock similarly transmitted from the HDMI transmitting unit 11b in the TMDS clock channel and thus received.

[0081] In addition to the three TMDS channels #0 to #2 as transmission channels for transmitting pixel data and voice data and the TMDS clock channel as a transmission channel for transmitting the pixel clock, the transmission channels for the HDMI system configured according to the HDMI source sending unit 11b and the HDMI receiving unit 12b include a transmission channel called a display data channel (DDC) 23 or a consumer electronics control (CEC) line 24.

[0082] The DDC 23 is composed of two signal lines included in the HDMI cable 13. The HDMI transmitting unit 11b uses the DDC 23 to read enhanced extended display identification data (E-EDID) from the HDMI receiving unit 12b connected via the HDMI cable 13. That is, in addition to the HDMI receiver 22, the HDMI receiving unit 12b has an EDID read-only memory (ROM) in which E-EDID, which is capability information related to its own configuration capability, is stored.

[0083] The HDMI transmitting unit 11b reads the E-EDID of the HDMI receiving unit 12b from the HDMI receiving unit 12b connected via the HDMI cable 13 via the DDC 23. Then, based on the E-EDID, the HDMI transmitting unit 11b identifies the setting of the configuration capability of the HDMI receiving unit 12b, that is, for example, the format (profile) of the image supported by the electronic device having the HDMI receiving unit 12b, such as RGB, YCbCr 4:4:4, YCbCr 4:2:2.

[0084] The CEC line 24 is composed of a signal line included in the HDMI cable 13 and is used to perform bidirectional control data communication between the HDMI transmitting unit 11b and the HDMI receiving unit 12b. In addition, a line (HPD line) 25 connected to a pin called hot plug detection (HPD) is included in the HDMI cable 13.

[0085] The source device uses the line 25 so that it can detect the connection of the sync device using the DC bias potential. In this case, from the perspective of the source device, the HPD line has a function of receiving a connection status notification from the sync device using the DC bias potential. On the other hand, from the perspective of the sync device, the HPD line has a function of notifying the source device of the connection status using the DC bias potential.

[0086] Furthermore, a line (power line) 26 used to supply power from the source device to the sync device is included in the HDMI cable 13. Furthermore, a reserved line 27 is included in the HDMI cable 13. In some cases, a pair of differential transmission paths is configured by the HPD line 25 and the reserved line 27 and is used as a bidirectional transmission path.

[0087] Figure 3 Various transmission data periods that exist when image data of 1920 rows of pixels and 1080 columns of lines are transmitted in TMDS channels #0, #1, and #2 are shown. In the video field in which transmission data is transmitted in the three TMDS channels #0, #1, and #2 of HDMI, there are three types of periods, video data period 17, data island period 18, and control period 19, depending on the type of transmission data.

[0088] Here, the video field period is the period from the active edge of a vertical synchronization signal to the active edge of the next vertical synchronization signal, and is divided into a horizontal blanking period 15, a vertical blanking period 16, and an effective pixel period 14 (active video) which is a period obtained by excluding the horizontal blanking period and the vertical blanking period from the video field period.

[0089] The video data period 17 is allocated to the effective pixel period 14. In the video data period 17, data on effective pixels (active pixels) of 1920 pixels×1080 lines constituting non-compressed image data for one image are transmitted. The data island period 18 and the control period 19 are allocated to the horizontal blanking period 15 and the vertical blanking period 16. In the data island period 18 and the control period 19, auxiliary data are transmitted.

[0090] That is, the data island period 18 is allocated to a part of the horizontal blanking period 15 and the vertical blanking period 16. In the data island period 18, for example, a voice data packet or the like, which is data not related to control among the auxiliary data items, is transmitted. The control period 19 is allocated to the other part of the horizontal blanking period 15 and the vertical blanking period 16. In the control period 19, for example, a vertical synchronization signal and a horizontal synchronization signal, which are data related to control among the auxiliary data items, a control data packet, etc. are transmitted.

[0091] According to the embodiment, the disc player 11 receives information on a transmission method and a gamma correction method of image data of a high dynamic range that the television receiver 12 can support from the television receiver 12 via the HDMI cable 13. The high dynamic range is hereinafter appropriately abbreviated as "HDR". In this case, the television receiver 12 stores information on a transmission method and a gamma correction method of HDR image data supported by the television receiver 12 itself in a storage unit, and transmits the information on the transmission method and the information on the gamma correction method to the disc player 11 via the HDMI cable 13. Moreover, in the prior art, there is no transmission specification for HDR images and there is no compatibility between cameras.

[0092] The disc player 11 selects a predetermined transmission method and a gamma correction method from the transmission methods of HDR image data that the television receiver can support, based on the information of the transmission method and the information of the gamma correction method received from the television receiver 12. In this case, for example, if there are two or more of each of the transmission method and the gamma correction method of HDR image data that the television receiver 12 can support, the disc player 11 selects a transmission method with less image degradation and a gamma correction method capable of the easiest approximation.

[0093] The disc player 11 transmits HDR image data to the television receiver 12 via the HDMI cable 13 according to the selected transmission method and gamma correction method. At this time, the disc player 11 transmits information about the method of transmitting the HDR image data to be transmitted and information about gamma correction to the television receiver 12 via the HDMI cable 13.

[0094] The television receiver 12 receives the HDR image data from the disc player 11 via the HDMI cable 13 and receives the information of the transmission method of the HDR image data and the information of the gamma correction. The television receiver 12 processes the received HDR image data based on the received information of the transmission method and the information of the gamma correction, and generates the HDR image data for display. The maximum brightness of an object in nature is equal to or greater than 2000 cd / m 2 .

[0095] In the prior art, for example, brightness is adjusted based on the assumption that image data recorded in a disk player is based on a maximum brightness of 100 cd / m 2 In other words, in the prior art, the brightness of the image data is greatly compressed compared to the brightness values ​​available in nature. In addition, the maximum brightness of the display device has been extended to 1000 cd / m 2 , exceeding the 100cd / m 2 When implemented in a display device it will initially be adjusted to 100 cd / m 2 The brightness of the image data is increased to 1000cd / m 2 When processing, image quality problems occur.

[0096] HDR images are proposed to achieve high brightness images with white level brightness of 100% or more. 100% white level brightness is usually represented as a bit value of 235 or 255 in an 8-bit system. For grayscale, 8 bits or more are required to express brightness exceeding 100% white level brightness. In other words, HDR image data is image data with a length of 10 bits, 12 bits, 16 bits, etc.

[0097] Figure 4is a diagram showing an 8-bit transmission method in the related art. Figure 4 (a) shows an example of an original white level of 10-bit HDR image data and a bit value associated with the original white level. Figure 4 (b) shows an example of the brightness level of 8-bit image data converted so as to transmit 10-bit HDR image data using the 8-bit transmission method and the bit value associated with the brightness level. In this case, since the 100% brightness level is assigned to the 8-bit value "235", the 200% brightness is the maximum value "255" of the 8-bit value, and brightness compression is performed, resulting in the loss of information of brightness exceeding 108%.

[0098] [Disc player configuration example]

[0099] Figure 5 1 is a configuration example of the disk player 11. The disk player 11 has an HDMI terminal 11a, an HDMI transmission unit 11b, and a high-speed bus interface 11c. In addition, the disk player 11 has a central processing unit (CPU) 104, an internal bus 105, a flash read-only memory (ROM) 106, a synchronous random access memory (SDRAM) 107, a remote control receiving unit 108, and a remote control transmitting unit 109.

[0100] In addition, the disk player 11 has a serial advanced technology attachment (SATA) interface 110, a Blu-Ray disk (BD) drive 111, an Ethernet interface (I / F) 112, and a network terminal 113. In addition, the disk player 11 has a moving picture experts group (MPEG) decoder 115, a graphics generation circuit 116, a picture output terminal 117, a voice output terminal 118, and an HDR processing circuit 114.

[0101] In addition, the disk player 11 may have a display control unit 121, a panel drive circuit 122, a display panel 123, and a power supply unit 124. Also, "Ethernet" is a registered trademark. A high-speed bus interface 11c, a CPU 104, a flash ROM 106, an SDRAM 107, a remote control receiving unit 108, a SATA interface 110, an Ethernet interface 112, and an MPEG decoder 115 are connected to the internal bus 105.

[0102] The CPU 104 controls the operation of each unit of the disk player 11. The flash ROM 106 retains control software and stores data. The SDRAM 107 constitutes a work area of ​​the CPU 104. The CPU 104 expands the software or data read from the flash ROM 106 on the SDRAM 107, starts the software and controls each unit of the disk player 11.

[0103] The remote control receiving unit 108 receives the remote control signal (remote control code) transmitted from the remote control transmitting unit 109, and provides the received remote control signal to the CPU 104. The CPU 104 controls each unit of the disk player 11 according to the remote control code. Moreover, according to this embodiment, the remote control unit is exemplified as a user instruction input unit, but the user instruction input unit may have a different configuration, such as a touch panel unit that performs instruction input using a switch, a scroll wheel, and proximity / touch, a gesture input unit that detects instruction input using a mouse, a keyboard, and a camera, and a voice input unit that performs instruction input using voice.

[0104] The BD drive 101 records content data on a BD disc (not shown) as a disc-shaped recording medium, or reproduces content data from the BD. The BD drive 111 is connected to the internal bus 105 through the SATA interface 110. The MPEG decoder 115 performs encoding processing on the MPEG 2 stream reproduced in the BD drive 111, thereby obtaining image data and voice data.

[0105] The graphic generation circuit 116 performs convolution processing of graphic data and the like on the image data obtained in the MPEG decoder 115, if necessary. The picture output terminal 117 outputs the image data output from the graphic generation circuit 116. The voice output terminal 118 outputs the voice data obtained in the MPEG decoder 115.

[0106] The panel drive circuit 122 drives the display panel 123 based on the picture (image) data output from the graphic generation circuit 260. The display control unit 121 controls the graphic generation circuit 116 or the panel drive circuit 122, thereby controlling the display on the display panel 123. For example, the display panel 123 is configured by a liquid crystal display (LCD), a plasma display panel (PDP), an organic electroluminescent (EL) panel, or the like.

[0107] Moreover, according to this embodiment, an example in which the display control unit 121 is provided outside the CPU 104 is illustrated, but the CPU 104 may directly control the display on the display panel 123. In addition, the CPU 104 and the display control unit 121 may be integrated into one chip, and may be multi-core. The power supply unit 124 supplies power to each unit of the disk player 11. The power supply unit 124 may be an AC power supply and a battery (storage battery or dry cell).

[0108] The HDMI transmission unit (HDMI source) 11b outputs baseband image (picture) data or voice data from the HDMI terminal 11a using HDMI-compliant communication. The high-speed bus interface 11c is an interface for a bidirectional communication path configured by predetermined lines (according to this embodiment, a reserved line and an HPD line) constituting the HDMI cable 13.

[0109] The high-speed bus interface 11c is inserted between the Ethernet interface 112 and the HDMI terminal 101. The high-speed bus interface 11c transmits transmission data supplied from the CPU 104 to the device of the other party from the HDMI terminal 101 via the HDMI cable 13. In addition, the high-speed bus interface 11c supplies reception data received from the device of the other party through the HDMI terminal 11a to the CPU 14 from the HDMI cable 13.

[0110] When the HDR image data for displaying the HDR image in the image data items obtained in the MPEG decoder 115 is transmitted in the TMDS channel of the HDMI, the HDR processing circuit 114 processes the HDR image data into a state according to the transmission method. Here, the HDR data is configured in a dark image format, or in a stereoscopic image data format, or in a high frame graphics format. Although the HDR processing circuit 114 and the HDMI transmitting unit 11b are integrated into one chip, they can be multi-core. The type of transmission method of the HDR image data, the selection of the transmission method, the data packet format of each method, etc. are described in detail below.

[0111] Brief description in Figure 5 1. In recording, content data is obtained through a digital tuner not shown, obtained from a network terminal 113 through an Ethernet interface 112, or obtained from an HDMI terminal 11a through a high-speed bus interface 11c. Content data is input to the SATA interface 110 and recorded on a BD by a BD drive 111. In some cases, content data may be recorded on a hard disk drive (HDD) connected to the SATA interface 110, which is not shown.

[0112] At the time of reproduction, the content data (MPEG stream) reproduced from the BD by the BD drive 111 is provided to the MPEG decoder 115 via the SATA interface 110. In the MPEG decoder 115, decoding processing is performed on the reproduced content data and the image data or voice data of the baseband. The image data is output to the picture output terminal 117 via the graphic generation circuit 116. In addition, the voice data is output to the voice output terminal 118.

[0113] Furthermore, at the time of reproduction, according to the operation of the user, the image data obtained in the MPEG decoder 115 is supplied to the panel driving circuit 122 through the graphic generating circuit 116, and the reproduced image is displayed on the display panel 123. Furthermore, according to the operation of the user, the voice data obtained in the MPEG decoder 115 is supplied to a speaker not shown, and the voice corresponding to the reproduced image is output.

[0114] In addition, during reproduction, if the image data or voice data obtained in the MPEG decoder 115 is transmitted in the TMDS channel of HDMI, the image data and voice data are provided to the HDMI transmitting unit 11b, thereby being packaged and output from the HDMI transmitting unit 11b to the HDMI terminal 11a.

[0115] Moreover, if the image data is HDR image data, the HDR image data is processed by the HDR processing circuit 114 into a state according to the selected transmission method and then provided to the HDMI transmission unit 11b. In addition, when the content data reproduced in the BD drive 111 is transmitted to the network at the time of reproduction, the content data is output to the network terminal 113 through the Ethernet interface 112. In the same manner, when the content data reproduced in the BD drive 111 is transmitted to the bidirectional communication path of the HDMI cable 13 at the time of reproduction, the content data is output to the HDMI terminal 11a through the high-speed bus interface 11c. Here, before the image data is output, the image data may be encoded using copyright protection technology (such as HDCP, DTCP, and DTCP+) so as to transmit the image data.

[0116] [Configuration example of TV receiver]

[0117] Figure 6 1 shows a configuration example of a television receiver 12. The television receiver 12 has an HDMI terminal 12a, an HDMI receiving unit 12b, a high-speed bus interface 12c, and an HDR processing circuit 204. In addition, the television receiver 12 has an antenna terminal 205, a digital tuner 206, an MPEG decoder 207, a picture signal processing circuit 208, a graphic generation circuit 209, a panel drive circuit 210, and a display panel 211.

[0118] In addition, the television receiver 12 has a voice signal processing circuit 212, a voice amplifying circuit 213, a speaker 214, an internal bus 220, a CPU 221, a flash ROM 222, and a synchronous random access memory (SDRAM) 223. In addition, the television receiver 12 has an Ethernet interface (I / F) 224, a network terminal 225, a remote control receiving unit 226, and a remote control transmitting unit 227. In addition, the television receiver 12 has a display control unit 231 and a power supply unit 232. Moreover, "Ethernet" is a registered trademark.

[0119] The antenna terminal 205 is a terminal to which a television broadcast signal received in a receiving antenna (not shown) is input. The digital tuner 206 processes the television broadcast signal input to the antenna terminal 205, thereby extracting a partial transport stream (TS) (TS packets of picture images and TS packets of voice data) from a predetermined transport stream corresponding to a channel selected by a user.

[0120] Furthermore, the digital tuner 206 extracts program specific information / service information (PSI / SI) from the obtained transport stream, and outputs the PSI / SI to the CPU 221. By obtaining information of a packet ID (PID) of an arbitrary channel from the PSI / SI (PAT / PMT), a process of extracting a partial TS of an arbitrary channel from a plurality of transport streams obtained in the digital tuner 206 can be performed.

[0121] The MPEG decoder 207 performs a decoding process on a picture packetized elementary stream (PES) configured by a TS packet of picture data obtained in the digital tuner 206, thereby obtaining image data. In addition, the MPEG decoder 207 performs a decoding process on a voice PED packet configured by a TS packet of voice data obtained in the digital tuner 206, thereby obtaining voice data.

[0122] If necessary, the picture signal processing circuit 208 and the graphics generation circuit 209 perform scaling processing (resolution conversion processing), convolution processing of graphics data, gamma correction of HDR image data, etc. on the image data obtained in the MPEG decoder 207 or the image data received in the HDMI receiving unit 202.

[0123] The panel drive circuit 210 drives the display panel 211 based on the picture (image) data output from the graphic generation circuit 209. The display control unit 231 controls the graphic generation circuit 209 or the panel drive circuit 210, thereby controlling the display on the display panel 211. For example, the display panel 211 is configured by a liquid crystal display (LCD), a plasma display panel (PDP), an organic electroluminescent (EL) panel, or the like.

[0124] Moreover, according to this embodiment, an example in which a display control unit 231 is provided in addition to the CPU 221 is shown, but the CPU 221 may directly control the display on the display panel 211. In addition, the CPU 221 and the display control unit 231 may be integrated into one chip, and may be multi-core. The power supply unit 232 supplies power to each unit of the television receiver 12. The power supply unit 232 may be an AC power supply and a battery (storage battery or dry cell).

[0125] The voice signal processing circuit 212 performs required processing, such as D / A conversion, on the voice data obtained in the MPEG decoder 207. The voice amplifier circuit 213 amplifies the voice signal output from the voice signal processing circuit 212, thereby providing the amplified voice signal to the speaker 214. Moreover, the speaker 214 can be mono or stereo. In addition, there can be one speaker 214 or there can be two or more speakers 214. In addition, the speaker 214 can be an earphone or a headset. In addition, the speaker 214 can correspond to 2.1 channels, 5.1 channels, etc. In addition, the speaker 214 can be connected to the television receiver 12 in a wireless manner. In addition, the speaker 214 can be another device.

[0126] The CPU 221 controls the operation of each unit of the television receiver 12. The flash ROM 222 holds control software and stores data. The DRAM 223 constitutes a work area of ​​the CPU 221. The CPU 221 expands the software and data read from the flash ROM 222 on the SDRAM 223, thereby starting the software and controlling each unit of the television receiver 12.

[0127] The remote control receiving unit 226 receives the remote control signal (remote control code) transmitted from the remote control transmitting unit 227, and supplies the received remote control signal to the CPU 221. The CPU 221 controls each unit of the television receiver 12 based on the remote control code. Moreover, according to this embodiment, the remote control unit is exemplified as a user instruction input unit, but the user instruction input unit may have a different configuration, such as a touch panel unit that performs instruction input using a switch, a scroll wheel, and proximity / touch, a gesture input unit that detects instruction input using a mouse, a keyboard, and a camera, and a voice input unit that performs instruction input using voice.

[0128] The network terminal 225 is a terminal connected to the network and connected to the Ethernet interface 224. To the internal bus 220, the high-speed bus interface 12c, the CPU 221, the flash ROM 222, the SDRAM 223, the Ethernet interface 224, the MPEG decoder 207, and the display control unit 231 are connected.

[0129] Using communication conforming to HDMI, the HDMI receiving unit (HDMI Sync) 12b receives baseband image (picture) data or voice data, which are supplied to the HDMI terminal 12a via the HDMI cable 13. Like the high-speed bus interface 11c of the above-mentioned disk player 11, the high-speed bus interface 12c is an interface for a bidirectional communication path configured by predetermined lines (according to this embodiment, a reserved line and an HPD line) constituting the HDMI cable 13.

[0130] The high-speed bus interface 12c is inserted between the Ethernet interface 224 and the HDMI terminal 201. The high-speed bus interface 12c transmits the transmission data supplied from the CPU 221 to the device of the other party from the HDMI terminal 12a via the HDMI cable 13. In addition, the high-speed bus interface 12c supplies the CPU 221 with the reception data received from the device of the other party through the HDMI terminal 12a from the HDMI cable 13.

[0131] If the image data received in the HDMI receiving unit 202 is HDR image data, the HDR processing circuit 204 performs processing (decoding processing) corresponding to the transmission method on the HDR image data, thereby generating HDR image data. That is, the HDR processing circuit 204 performs the inverse processing of the processing performed by the HDR processing circuit 114 of the above-mentioned disc player 11, thereby obtaining data constituting the HDR image data. The HDR processing circuit 204 and the HDMI receiving unit 202, or the HDR processing circuit 204 and the picture signal processing circuit 208 may be integrated into one chip, or may be a multi-core.

[0132] In addition, the HDR processing circuit 204 performs an arithmetic operation that generates HDR image data based on first data configured by low-order 8-bit image data of the HDR image and second data configured by high-order 8-bit image data of the HDR image, or generates HDR image data based on first data configured by high-order 8-bit image data of the HDR image and second data configured by low-order 8-bit image data of the HDR image.

[0133] Moreover, for example, when the received content data is transmitted to the network, the content data is output to the network terminal 225 through the Ethernet interface 224. In the same manner, when the received content data is transmitted to the bidirectional communication path of the HDMI cable 13, the content data is output to the HDMI terminal 11a through the high-speed bus interface 12c. Here, before the image data is output, the image data may be encoded using copyright protection technology (such as HDCP, DTCP, and DTCP+) and transmitted.

[0134] Brief description in Figure 62. The operation of the television receiver 12 is shown in FIG. The television broadcast signal input to the antenna terminal 205 is supplied to the digital tuner 206. In the digital tuner 206, the television broadcast signal is processed, a predetermined transport stream corresponding to a channel selected by a user is output, a partial transport stream (TS) (TS packets of picture images and TS packets of voice data) is extracted from the transport stream, and the partial TS is supplied to the MPEG decoder 207.

[0135] In the MPEG decoder 207, decoding processing is performed on the picture PES packet configured by the TS packet of the picture data, thereby obtaining the picture data. If necessary, in the picture signal processing circuit 208 and the graphic generation circuit 209, scaling processing (resolution conversion processing) and convolution processing of the graphic data are performed on the picture data, and then the picture data is supplied to the panel driving circuit 210. For this reason, the image corresponding to the channel selected by the user is displayed on the display panel 211.

[0136] Furthermore, in the MPEG decoder 207, a decoding process is performed on the voice PES packet configured by the TS packet of the voice data, thereby obtaining the voice data. The necessary processing such as D / A conversion is performed on the voice data in the voice signal processing circuit 212, the voice data is additionally amplified by the voice amplification circuit 213, and then the voice data is supplied to the speaker 214. For this reason, the voice corresponding to the channel selected by the user is output from the speaker 214.

[0137] In addition, the content data (image data and voice data) supplied from the network terminal 225 to the Ethernet interface 224 or supplied from the HDMI terminal 12a through the high-speed bus interface 12c is supplied to the MPEG decoder 207. Subsequently, the same operation as when a television broadcast signal is received is performed, so that an image is displayed on the display panel 211 and a voice is output from the speaker 214.

[0138] Furthermore, in the HDMI receiving unit 12b, image data and voice data transmitted from the disk player 11 connected to the HDMI terminal 12a via the HDMI cable 13 are obtained. The image data is supplied to the picture signal processing circuit 208 through the HDR processing circuit 204. Furthermore, the voice data is directly supplied to the voice signal processing circuit 212. Subsequently, the same operation as when a television broadcast signal is received is performed, so that an image is displayed on the display panel 211 and voice is output from the speaker 214.

[0139] Moreover, if the image data received in the HDMI receiving unit 12b is HDR image data, in the HDR processing circuit 204, processing (decoding processing) corresponding to the transmission method is performed on the HDR image data, thereby generating HDR image data. Then, the HDR image data is provided from the HDR processing circuit 204 to the picture signal processing unit 208. In addition, in the picture signal processing circuit 208, if the HDR image data is provided, image data for displaying an HDR image is generated based on the HDR image data, and gamma correction is performed based on the gamma correction information received in the HDMI receiving unit 12b. For this reason, the HDR image is displayed on the display panel 211.

[0140] [HDR image data transmission method]

[0141] Next, a method for transmitting HDR image data is described. First, a case where the HDR image data of the original signal is configured by image data having a length of 8 bits or more is described. Here, Figures 7 to 9 As shown in the description Figures 7 to 9 Each item of HDR image data is image data in a 1920×1080p pixel format.

[0142] Consider that when the original signal is transmitted using a baseband digital interface, for example, the following three transmission methods are used. These methods are the most desirable methods because they can be transmitted without reducing the level of the original signal. However, since the transmission band needs to be 1.2 times or more of the image data in the 8-bit pixel format of 1920×1080p, transmission is possible when there is space in the transmission band.

[0143] The transmission method (1) is as follows Figure 7 A method of performing transmission using a deep color transmission format is shown in . In this case, a 1920×1080p pixel format is selected as an image format, and information for allocating the number of bits per pixel to any one of "DC-48 bits", "DC-36 bits", and "DC-30 bits" described below and information for HDR transmission to be redefined are transmitted together. In this case, since all pixel data cannot be transmitted using one pixel block, pixel mapping processing is required in the HDR processing circuit 114 or the HDMI transmission unit 11b.

[0144] In the transmission method (2), if Figure 8As shown, the lower 8 bits of the HDR image data are arranged in the left eye image data area in the stereoscopic picture format, and the remaining upper bits of the HDR image data are arranged in the right eye image data area in the stereoscopic picture format, thereby transmitting the HDR image data. In this case, a picture format called 1920×1080p frame packing is specified as the picture format and is transmitted together with information on the HDR transmission method to be redefined without specifying the stereoscopic picture format. In this case, slice processing of the lower 8-bit image data and the upper bit image data and processing of bit mapping to a predetermined stereoscopic picture format are required in the HDR processing circuit 114.

[0145] Furthermore, the above provides a description of the effect of arranging the remaining high-order bits of HDR image data in the left-eye image data area of ​​the stereoscopic picture format and transmitting. That is, when the HDR image data is 10-bit image data, 12-bit image data, and 16-bit image data, the remaining high-order bits of the HD image data are 2 bits, 4 bits, and 8 bits, respectively. It is also considered that the high-order 8 bits of the HDR image data are arranged in the right-eye image data area of ​​the stereoscopic picture format and transmitted instead of the remaining high-order bits.

[0146] In addition, the above provides a description of the effect of arranging the lower 8 bits of HDR image data in the left eye image data area of ​​the stereoscopic picture format, and the remaining upper bits of the HDR image data in the right eye image data area of ​​the stereoscopic picture format to transmit the HDR image data. However, it is also considered that the lower 8 bits of the HDR image data are arranged in the left eye image data area of ​​the stereoscopic picture format, and the remaining upper bits of the HDR image data are arranged in the right eye image data area of ​​the stereoscopic picture format to transmit the HDR image data.

[0147] In addition, the above provides a description of the effect of arranging the lower 8 bits of HDR image data in the left eye image data area of ​​the stereoscopic picture format, and the remaining upper bits of the HDR image data in the right eye image data area of ​​the stereoscopic picture format to transmit the HDR image data. However, it is also considered that the upper 8 bits of the HDR image data are arranged in the left eye image data area of ​​the stereoscopic picture format, and the remaining lower bits of the HDR image data are arranged in the right eye image data area in the stereoscopic picture format to transmit the HDR image data.

[0148] The transmission method (3) is a transmission method in which, if Fig. 9As shown in , the low-order 8 bits of HDR image data are arranged in the first frame image data area with a high frame rate, and the remaining high-order bits of the HDR image data are arranged in the second frame image data area, thereby transmitting the HDR image data. In this case, the normal 1920×1080p picture format for high frame rate is specified as the picture format and is transmitted together with the information of the HDR transmission method to be redefined. In this case, slice processing of the low-order 8-bit image data and the high-order bit image data and processing of bit mapping to a predetermined image format for a high frame rate are required in the HDR processing circuit 114.

[0149] Furthermore, the above provides a description of the effect of arranging the remaining high-order bits of the HDR image data in the second frame image data area and transmitting. That is, when the HDR image data is 10-bit image data, 12-bit image data, and 16-bit image data, the remaining high-order bits of the HD image data are 2 bits, 4 bits, and 8 bits, respectively. It is also considered that the high-order 8 bits of the HDR image data are arranged in the second frame image data area and transmitted instead of the remaining high-order bits.

[0150] In addition, the above provides a description of the effect of arranging the lower 8 bits of HDR image data in the first frame image data area with a high frame rate, and the remaining upper bits of the HDR image data in the second frame image data area to transmit the HDR image data. However, it is also considered that the lower 8 bits of the DR image data are arranged in the second frame image data area with a high frame rate, and the remaining upper bits of the HDR image data are arranged in the first frame image data area to transmit the HDR image data.

[0151] In addition, the above provides a description of the effect of arranging the lower 8 bits of HDR image data in the first frame image data area with a high frame rate, and the remaining upper bits of the HDR image data in the second frame image data area to transmit the HDR image data. However, it is also considered that the upper 8 bits of the HDR image data are arranged in the first frame image data area with a high frame rate, and the remaining lower bits of the HDR image data are arranged in the second frame image data area to transmit the HDR image data.

[0152] Moreover, in the case of transmission methods (2) and (3), the HDR processing circuit 204 of the above-mentioned television receiver 12 performs processing to separately extract the low-order 8 bits and high-order bits or the high-order 8 bits and low-order bits of HDR image data from the stereoscopic picture format or from the high frame rate picture format, respectively.

[0153] [Gamma correction method for HDR image data]

[0154] Next, a gamma correction method for HDR image data is described.

[0155] In the gamma correction method (1), if Fig.10 As shown, a gamma correction curve can be approximated by assigning a brightness level of the display panel 211 assumed at 100% brightness, a maximum brightness level of the HDR image to be sent, a bit value of image data indicating 0% brightness, a bit value of image data indicating 100% brightness, and a bit value of image data indicating a maximum white level expressed in the HDR image, and the HDR image under consideration can be displayed by performing image correction based on the approximated curve.

[0156] In the gamma correction method (2), if Fig.11 As shown, a gamma correction curve can be approximated by assigning an output brightness level of the display panel 211 assumed at an assigned brightness input level, a brightness dynamic range value of the transmitted HDR image, and a maximum brightness level, and the assumed HDR image can be displayed by performing image correction based on the approximated curve.

[0157] In the gamma correction method (3), if Fig.12 As shown, the gamma correction curve can be approximated by assigning the brightness level at 100% brightness, the brightness level at 0% brightness, and the gamma value defined in ITU-R BT.1886, and the assumed HDR image can be displayed by performing image correction based on the approximated curve.

[0158] [Example of EDID data structure]

[0159] Fig.13 An example of the data structure of E-EDID is shown. E-EDID consists of a basic block and an extended block. Data specified by the E-EDID 1.3 specification expressed as "E-EDID 1.3 Basic Structure" is arranged in the header of the basic block. Subsequently, timing information expressed as "Preferred timing" for maintaining compatibility with the previous EDID and timing information expressed as "2nd timing" different from "Preferringtiming" for maintaining compatibility with the previous EDID are arranged.

[0160] In addition, in the basic block, after “2nd timing”, information indicating the name of the display device expressed as “Monitor Name” and information indicating the number of pixels available for the display in the case of a 4:3 or 16:9 aspect ratio expressed as “Monitor Range Limits” are sequentially arranged.

[0161] In the header of the extended block, the following contents are arranged in sequence: data of a description of the image size (resolution) available for the display expressed as a "Short Video Descriptor", a frame rate, information indicating whether the display is interlaced or progressive, and information including information such as an aspect ratio, and data of a description of a method of encoding and decoding reproducible speech, a sampling frequency, a cutoff band, and information including information such as the number of codec bits expressed as a "Short Audio Descriptor", and information about the left and right speakers expressed as a "Speaker Allocation".

[0162] In addition, in the extension block, after "Speaker Allocation", data specifically defined for each manufacturer expressed as "VenderSpecific", timing information expressed as "3rd timing" for maintaining compatibility with the previous EDID, and timing information expressed as "4th timing" for maintaining compatibility with the previous EDID are arranged.

[0163] [Example of data structure of the vendor specific data block (VSDB) area]

[0164] According to this embodiment, a data area extended to store HDR image information is defined in the VSDB area. Fig.14 An example of the data structure of the VSDB area is shown. 0th to Nth blocks are provided in the VSDB area, each of which is a one-byte block.

[0165] The data area of ​​HDR image information that the synchronization device (the television receiver 12 according to this embodiment) must store is defined in the fourth bit of the eighth byte and in the (M+1)th to (M+3)th bytes after the already defined 0th to Mth bytes.

[0166] First, the 0th to 8th bytes are described. The header indicating the data area expressed as "Vender-specific tag code (=3)" and the information indicating the length of the VSDB data expressed as "Length (=N)" are arranged in the 0th byte arranged in the header of the data, and the header of the data is expressed as "VendorSpecific". In addition, information indicating the number "0x000C03" expressed as "24bit IEEE Registration Identifier (0x000C03) LSB first" registered for HDMI (R) is arranged in the first to third bytes.

[0167] In addition, information expressed by each of "A", "B", "C" and "D" indicating the 24-bit physical address of the sync device is arranged in the fourth to fifth bytes. In the sixth byte, a flag expressed as "Supports-AI" indicating the functions supported by the sync device, each piece of information expressing the number of bits allocated per pixel expressed as each of "DC-48bit", "DC-36bit" and "DC-30bit", a flag indicating whether the sync device supports the transmission of 4:4:4:YCbCr images expressed as "DCY 444", and a flag indicating whether the sync device supports digital video interface (DVI) expressed as "DVI-Dual" are arranged.

[0168] In addition, information indicating the maximum frequency of the pixel clock of TMDS expressed as "Max-TMDS-Clock" is arranged in the seventh byte. Information on the presence of the allocation delay field, information on the presence of the allocation interlaced delay field, information on the presence of the allocation extension of the 3D video format, and information on the functional support of the allocation content type (CNC) are arranged in the eighth byte. In the fourth bit of the eighth byte, a flag indicating whether HDR information supported by the synchronization device exists is rearranged. If the flag is true, this indicates that information about HDR exists in the (15+M)th to (18+M)th bytes.

[0169] Next, the (15+M)th to (18+M)th bytes are described. Whether the processing related to the HDR function is prohibited in the source device is indicated in the seventh bit of the (15+M)th byte. Data indicating three video formats of HDR images supported by the synchronization device (the above-mentioned transmission methods (1) to (3)) is written in each of the sixth to fourth bits of the (15+M)th byte.

[0170] If a method other than this is proposed, the third to 0th bits of the (15+M)th byte are available for allocation. Data indicating three methods of gamma correction of HDR images supported by the synchronization device are written in each of the seventh to fifth bits of the (16+M)th byte. If a gamma correction method other than this is proposed, the fourth to 0th bits of the (16+M)th byte are available for allocation.

[0171] As an example, if the seventh bit is true, processing such as increasing the brightness level of the HDR image or compressing bits is prohibited in the source device. The maximum brightness value available to the display panel unit 211 of the synchronization device is in cd / m 2 The maximum brightness increase level that can be processed by the picture signal processing circuit 208 of the sync device is allocated to the (17+M)th byte in units of percentage. If "Raw" in the seventh bit of the (15+M)th byte is false, these are used as information required for processing such as brightness increase or bit compression of HDR images performed in the source device on the sync device.

[0172] A method of storing HDR transmission information using the VSDB area is proposed here, but the storage of HDR transmission information is not limited to this method, because the data structure of E-EDID, for example, such as using the video capability data block (VCDB), can also be implemented in data areas other than this.

[0173] exist Figure 1 In the AV system 10 shown, the CPU 104 of the disk player (source device) 11 uses the HPD line (reference Figure 2 ) checks the connection to the television receiver (synchronizer) 12. Thereafter, the DDC 23 (reference Figure 2 ), the CPU 104 of the disc player 11 reads the E-EDID from the television receiver 12 to read the HDR image information, and identifies the transmission method of the HDR image supported by the television receiver 12.

[0174] exist Figure 1 In the AV system 10 shown, when HDR image data is transmitted to the television receiver 12, as described above, the disc player 11 selects an arbitrary transmission method and an arbitrary gamma correction method from the transmission methods and gamma correction methods of HDR image data that the television receiver 12 can support, respectively, based on the HDR image information read from the television receiver 12, thereby selecting the transmission method and the gamma correction method and transmitting the HDR image data. At that time, the disc player 11 transmits information about the HDR image format currently being transmitted to the television receiver 12.

[0175] In this case, the disk player 11 transmits the information to the television receiver 12 by inserting the information into the blank period of the HDR image data (picture signal) transmitted to the television receiver 12. Here, for example, by using a vendor-specific information frame (hereinafter referred to as "VSIF") packet of HDMI, the disk player 11 inserts the information about the image format currently being transmitted into the blank period of the HDR image data. The VSIF packet is arranged in the above-mentioned data island period 19 (refer to Figure 3 )middle.

[0176] [An example of the data structure of a VSIF packet]

[0177] Fig.15 An example of the data structure of a VSIF packet is shown. For HDMI, supplementary information about an image can be sent from a source device to a sync device using a VSIF packet. The checksum of the data is defined in the 0th byte. Information indicating the number "0x000C03" registered for HDMI(R) expressed as "24bit IEEE Registration Identifier (0x000C03) LSB first" is arranged in the first to third bytes.

[0178] A flag indicating whether 3D data exists in the fifth to (7+N)th bytes after the fourth byte is allocated to the seventh bit of the fourth byte. An "HDR_Format" flag indicating whether transmission information of HDR image data exists in the (8+N)th byte and subsequent bytes is allocated to the subsequent sixth bit. If the "HDR_Format" flag is false, this indicates that there is no transmission of HDR image data. If the "HDR_Format" flag is true, supplementary information about the HDR image is allocated to the (8+N)th to (11+M+N)th bytes.

[0179] Information on whether processing such as brightness increase or brightness compression is performed on the HDR image to be transmitted in the source device is allocated to the seventh bit of the (8+N)th byte. If "Raw" is true, this indicates that processing such as brightness increase is not performed on the source device. If "Raw" is false, this indicates that processing such as brightness increase is performed on the source device.

[0180] Information about which of the three methods (transmission methods (1) to (3)) (picture format) of transmitting the HDR image is selected is allocated to the subsequent sixth to fourth bits. In this case, for the sixth to fourth bits, the transmission method (1) is set to 0b001, the transmission method (2) is set to 0b010, and the transmission method (3) is set to 0b011. If a method other than this is proposed, the sixth to fourth bits of 0b100 to 0b111 and the third to 0th bits can be used for allocation.

[0181] Information about which of the three gamma correction methods of the HDR image (the above-mentioned gamma correction methods (1) to (3)) is selected is allocated to the seventh to fourth bits of the (9+N)th byte. In this case, for the seventh to fourth bits, the gamma correction method (1) is set to 0b0001, the gamma correction method (2) is set to 0b0010, and the gamma correction method (3) is set to 0b0011. If a method other than this is proposed, the seventh to fourth bits 0b0100 to 0b1111 and the fourth to 0th bits are available for allocation. The byte length (M) of the data in the gamma correction method allocated to the (11+N)th byte and subsequent bytes is allocated to the (10+N)th byte.

[0182] Fig.16 The gamma correction method (1) is shown in Fig.10 ). The data length 9 for the gamma correction method (1) is allocated to the (10+N)th byte. The brightness level "Reference_Screen_Luminance_White" of the display panel 211 assumed at 100% brightness is expressed in cd / m 2 The maximum brightness level "Extended_Range_White_Level" of the HDR image to be sent is allocated to bytes (13+N) to (14+N) in units of percentage.

[0183] The bit value "Nominal_Black_Level_Code_Value" of the image data indicating the 0% brightness level is allocated to the (15+N)th byte. Generally, because values ​​from 0 to 64 are allocated, the length is one byte. The bit value "Nominal_White_Level_Code_Value" of the image data indicating the 100% brightness level is allocated to the (16+N)th to (17+N)th bytes. The bit value "Extended_White_Level_Code_Value" of the image data indicating the maximum white level expressed in the HDR image is allocated to the (18+N)th to (19+N)th bytes.

[0184] Above Fig.10 An example of HDR information (1) transmitted using a VSIF packet is shown, that is, the values ​​of the above-mentioned "Extended_Range_White_Level", "Nominal_Black_Level_Code_Value", "Nominal_White_Level_Code_Value", and "Extended_White_Level_Code_Value". In this example, "Extended_Range_White_Level" is "400" and the bit length is 10 bits.

[0185] Fig.17 The gamma correction data structure for gamma correction method (2) is shown. The data length 13 for gamma method (2) is allocated to the (10+N)th byte. The input brightness level "Input_Knee_Point" for method (2) is allocated to the (11+N)th to (12+N)th bytes in units of 0.1%. The output brightness level "Output_Knee_Point" is allocated to the (13+N)th to (14+N)th bytes in units of 0.1%.

[0186] The dynamic range "Dynamic_Range" of the HDR image to be transmitted is allocated to bytes (15+N) to (18+N) in units of 0.1%. The luminance level "Dynamic_Range_Luminance" of the maximum dynamic range is expressed in cd / m 2 The units are allocated to the (19+N)th to (22+N)th bytes.

[0187] Above Fig.11 An example of HDR information (2) transmitted using a VSIF packet is shown, i.e., the values ​​of the above-mentioned "Input_Knee_Point", "Output_Knee_Point", "Dynamic_Range", and "Dynamic_Range_Luminance". Here, a data structure for a set of "Knee_Point" is described, but a more accurate curve can be approximated using data with multiple "Knee_Point".

[0188] Fig.18 The gamma correction data structure for gamma method (3) is shown. The data length 4 for gamma correction method (3) is allocated to the (10+N)th byte. The brightness level "Screen_Luminance_White_Level" at 100% brightness is expressed in cd / m 2The brightness level "Screen_Luminance_Black_Level" at 0% brightness is expressed in cd / m 2 The unit is allocated to the (13+N)th byte. Generally, since a value from 0 to 64 is allocated, the length is one byte. The gamma value "Gamat_Value" is allocated to the (14+N)th byte.

[0189] Above Fig.12 An example of a calculation formula using the HDR information (3) transmitted via the VSIF packet, namely the above-mentioned “Screen_Luminance_White_Level”, “Screen_Luminance_Black_Level” and “Gamat_Value” is shown.

[0190] If any one of the sixth to fourth bits of the (8+N)th byte is set to true, the synchronization device (according to this embodiment, the television receiver 12) can determine that HDR image data is transmitted. In addition, depending on which bit among the sixth to fourth bits is set to true, the synchronization device can determine the transmission method (picture format).

[0191] That is, if the sixth to fourth bits are set to 0b001, it should be understood that a picture format called 1920×1080p deep color is used, thereby performing transmission of HDR image data (refer to Figure 7 ). In addition, if the sixth to fourth bits are set to 0b010, a stereoscopic picture format called 1920×1080p frame packing is used, thereby performing transmission of HDR image data (refer to Figure 8 ). In addition, it should be understood that if the sixth to fourth bits are set to 0b011, a high frame rate 1920×1080p picture format is used, thereby performing transmission of HDR image data (refer to Fig. 9 ).

[0192] In addition, using the values ​​of the seventh to fourth bits of the (9+N)th byte, the gamma correction method of the HDR image can be determined. That is, it should be understood that if the seventh to fourth bits are set to 0b0001, the gamma correction method (1) is used, thereby performing the transmission of the HDR image data (refer to Fig.10 ). In addition, it should be understood that if the seventh to fourth bits are set to 0b0010, the gamma correction method (2) is used, thereby performing the transmission of HDR image data (refer to Fig.11 ). In addition, it should be understood that if the seventh to fourth bits are set to 0b0011, the gamma correction method (3) is used, thereby performing the transmission of HDR image data (refer to Fig.12 ).

[0193] Here, a method of transmitting HDR transmission information using a VSIF packet is proposed, but the transmission of HDR transmission information is not limited to this method, because transmission can also be achieved using packets other than this, such as using an auxiliary video (AV) information frame. However, if the information related to HDR of the TV receiver (sync device) 12 is transmitted to the disc player (source device) 11 using the VSDB area of ​​the E-EDID data area, it is desirable to transmit the information related to HDR of the disc player 11 using the VSIF packet.

[0194] [Example of Processing Executed by Source Device When Connecting to Device]

[0195] Next, refer to Fig.19 The flowchart in the description is in Figure 1 The AV system 10 shown is a process performed by a disk player (source device) 11 when connected to a television receiver (sync device) 12.

[0196] The disk player 11 starts processing in step ST1, and thereafter continues processing in step ST2. In step ST2, the disk player 11 determines whether the HPD signal is at a high level "H". When the HPD signal is not at a high level "H", the television receiver (synchronizer) 12 is not connected to the disk player 11. At this time, the disk player 11 proceeds to step ST8, and the processing ends.

[0197] If the HPD signal is at a high level "H", the disk player 11 reads the E-EDID of the television receiver 12 in step ST3. Then, in step ST4, the disk player 11 determines whether HDR image information (HDR data) exists. When the HDR image information does not exist, the disk player 11 sets data indicating that the HDR image is not transmitted in the VSIF packet in step ST7, thereafter proceeds to step ST8, and the process ends. Here, the setting of the data indicating that the HDR image is not transmitted means that the VSIF packet (refer to Fig.15 ) is set to a low level “L”.

[0198] Furthermore, when there is HDR image information in step ST4, the disc player 11 determines the transmission method and gamma correction method of the HDR image data in step ST5. Then, the disc player 11 sets data indicating the transmission method and gamma correction method of the HDR image data in the VSIF packet in step ST6, thereafter proceeds to step ST8, and the processing ends.

[0199] [Example of Selection Processing of HDR Transmission Method in Source Device]

[0200] Next, refer to Fig. 20 and 21 The flowchart in the description is in Figure 1 In the AV system 10 shown in FIG. 1 , a disc player (source device) 11 determines a transmission method of HDR image data. Fig.19 (processing in step ST5 in the above).

[0201] The disk player 11 starts the processing in step ST11, and thereafter proceeds to step ST12. In step ST12, the disk player 11 determines whether the fourth bit of the eighth byte in the VSDB area in the television receiver (synchronizer) 12 is at a high level "H". When the fourth bit of the eighth byte is not at a high level "H", the disk player 11 sets data indicating that the HDR image is not transmitted in the VSIF packet in step ST13, and thereafter proceeds to step ST27, and the processing ends. Here, the setting of the data indicating that the HDR image is not transmitted means that the VSIF packet (refer to Fig.12 ) is set to "L".

[0202] When the fourth bit of the eighth byte is at the high level "H" in step ST12, the disk player 11 proceeds to the processing in step ST14. In step ST14, the disk player 11 determines whether the seventh bit of the (15+M)th byte in the VSDB area in the television receiver 12 is at the high level "H". When the seventh bit of the (15+M)th byte is not at the high level "H", the disk player 11 reads the (17+M)th byte and the (18+M)th byte in the VSDB area in step ST15 and proceeds to the next step ST16.

[0203] In step ST16, based on the maximum brightness (cd / m 2 ) byte, and based on the data on the maximum brightness increase level (%) stored in the (18+M)th byte, the disc player 11 performs brightness compression processing on the HDR image to be transmitted, and proceeds to the next step ST17. In step ST17, the disc player 11 sets data indicating that brightness compression processing is performed on the HDR image and information on gamma correction in the VSIF packet, thereafter proceeds to step ST27, and the processing ends. Here, the setting of data indicating that brightness compression processing is performed on the HDR image means that the VSIF packet (refer to Fig.15 ) is set to "False = 'L'".

[0204] Furthermore, when the seventh bit of the (15+M)th byte is at the high level "H" in step ST14, the disc player 11 proceeds to the next step ST19 without performing the brightness compression process on the HDR image in step ST18. In step ST19, the disc player 11 determines whether the sixth bit of the (15+M)th byte in the VSDB area is set to the high level "H".

[0205] When the sixth bit of the (15+M)th byte is at a high level "H", the disc player 11 selects method (1) from the HDR image transmission methods in step ST20, and proceeds to the next step ST21. In step ST21, the disc player 11 sets data indicating the transmission method (1) of the HDR image in the VSIF packet, and thereafter proceeds to step ST26-1. Here, the setting of the data indicating the transmission method (1) of the HDR image means that the VSIF packet (refer to Fig.15 ) in which the sixth to fourth bits of the (8+N)th byte are set to "0b001".

[0206] Furthermore, when the sixth bit of the (15+M)th byte is at a low level "L" in step ST19, the process proceeds to the next step ST22. In step ST22, the disc player 11 determines whether the fifth bit of the (15+M)th byte in the VSDB area is set to a high level "H". When the fifth bit of the (15+M)th byte is at a high level "H", the disc player 11 selects method (2) from the HDR image transmission methods in step ST23, and proceeds to the next step ST24.

[0207] In step ST24, the disc player 11 sets data indicating the transmission method (2) of the HDR image in the VSIF packet, and then proceeds to step ST26-1. Here, the setting of the data indicating the transmission method (2) of the HDR image means that the VSIF packet (refer to Fig.15 ) in which the sixth to fourth bits of the (8+N)th byte are set to "0b010".

[0208] Furthermore, when the fifth bit of the (15+M)th byte is not at the high level "H" in step ST22, the disc player 11 selects method (3) from the HDR image transmission methods in step ST25, and proceeds to the next step ST26. In step ST26, the disc player 11 sets data indicating the transmission method (3) of the HDR image in the VSIF packet, and thereafter proceeds to step ST26-1. Here, the setting of the data indicating the transmission method (3) of the HDR image means that the VSIF packet (refer to Fig.15 ) in which the sixth to fourth bits of the (8+N)th byte are set to "0b011".

[0209] In step ST26-1, the disk player 11 determines whether the sixth bit of the (16+M)th byte in the VSDB data packet is at a high level "H". When the sixth bit of the (16+M)th byte is at a high level "H", in step ST26-2, the disk player 11 sets the seventh to fourth bits of the (9+N)th byte in the VSIF area to "0b0010", sets data on the gamma correction method (2) in the (10+N)th to (22+N)th bytes, and proceeds to step ST27, and the processing ends.

[0210] Furthermore, when the sixth bit of the (16+M)th byte in the VSDB data packet is not at the high level "H" in step ST26-1, the disk player 11 proceeds to step ST26-3. In step ST26-3, the disk player 11 determines whether the seventh bit of the (16+M)th byte in the VSDB data packet is at the high level "H". When the seventh bit of the (16+M)th byte is at the high level "H", in step ST26-4, the disk player 11 sets the seventh to fourth bits of the (9+N)th byte in the VSIF area to "0b0001", sets data on the gamma correction method (1) in the (10+N)th to (19+N)th bytes, and proceeds to step ST27, and the processing ends.

[0211] Furthermore, when the seventh bit of the (16+M)th byte is not at the high level "H" in step ST26-3, the disk player 11 proceeds to step ST26-5. In step ST26-5, the disk player 11 determines whether the fifth bit of the (16+M)th byte in the VSDB data packet is at the high level "H". When the fifth bit of the (16+M)th byte is at the high level "H", in step ST26-6, the disk player 11 sets the seventh to fourth bits of the (9+N)th byte in the VSIF area to "0b0011", sets data on the gamma correction method (3) in the (10+N)th to (14+N)th bytes, and proceeds to step ST27, and the processing ends.

[0212] Furthermore, when the fifth bit of the (16+M)th byte in the VSDB data packet is not at the high level "H" in step ST26-5, the disk player 11 proceeds to step ST26-7. In step ST26-7, the seventh to fourth bits of the (9+N)th byte in the VSIF area are set to "0b0000" and the (10+N)th byte is set to "L", the process proceeds to step ST27, and the processing ends.

[0213] [Example of processing performed by the synchronization device when setting the energy saving mode]

[0214] Next, refer to Fig. 22The flowchart in the description is in Figure 1 The processing performed by the television receiver (synchronizer) 12 when the energy saving mode is set in the AV system 10 shown. The television receiver 12 starts the processing in step ST30 and thereafter proceeds to step ST31. In step ST31, the television receiver 12 determines whether its own operation mode is set to the energy saving mode.

[0215] When setting to the energy saving mode is performed, it is not desirable for the television receiver 12 to perform an increase in HDR brightness more than necessary from the perspective of energy saving because the user selects an operation to suppress power consumption by lowering the brightness of the display panel 211 to display an image. For this reason, when setting to the energy saving mode is performed, the television receiver 12 proceeds to the processing in step ST32.

[0216] In step ST32, the television receiver 12 sets the seventh bit of the (15+M)th byte present in the VSDB area of ​​its own E-EDID to "False='L'". In addition, in step ST32, the television receiver 12 also sets the value of the maximum brightness level of the display panel 211 stored in the (17+M)th byte and the value of the maximum brightness range stored in the (18+M)th byte to the value of the brightness level and the value of the maximum brightness range set in the energy saving mode, respectively. Thereafter, the television receiver 12 proceeds to step ST34, and the processing ends.

[0217] In addition, when setting to the energy saving mode is not performed in step ST31, the television receiver 12 proceeds to step ST33. In step ST33, the television receiver 12 sets the seventh bit of the (15+M)th byte present in the VSDB area of ​​its own E-EDID to "True='H'". In addition, in step ST33, the television receiver 12 also sets the value of the maximum brightness level of the display panel 211 stored in the (17+M)th byte and the value of the maximum brightness range stored in the (18+M)th byte to the value of its own maximum brightness level and the value of the maximum brightness range, respectively. Thereafter, the television receiver 12 proceeds to step ST34, and the processing ends.

[0218] [Example of Processing of Synchronizing Device to Cancel Energy Saving Mode]

[0219] Next, we will refer to Fig.23 The flowchart in the description is in Figure 1 The illustrated AV system 10 is a process performed by the television receiver (synchronizing device) 12 when transmission of an HDR image starts from the disk player (source device) 11 when the energy saving mode is set.

[0220] The television receiver 12 starts processing in step ST40, and then proceeds to step ST41. In step ST41, the television receiver 12 determines the VSIF packet (reference Fig.15 ) is set to a high level "H". If the sixth bit of the fourth byte is not set to a high level "H", it is determined that there is no transmission of the HDR image, and then proceeding to step ST47 occurs without canceling the energy saving mode, and the processing ends.

[0221] If the sixth bit of the fourth byte is set to high level "H" in step ST41, the television receiver 12 proceeds to step ST42. In step ST42, the television receiver 12 determines whether the television receiver 12 itself is set to the energy saving mode. If the setting to the energy saving mode is not performed, the television receiver 12 determines that it is possible to receive the HDR image, and then proceeds to step ST47 without being set to the energy saving mode, and the processing ends.

[0222] If the setting to the energy saving mode is performed in step ST42, the television receiver 12 proceeds to the next step ST43. In step ST43, the television receiver 12 displays a selection screen on the display panel 211, through which the user gives an instruction whether to cancel the energy saving mode to perform reception of the HDR image, thereby reminding the user of the selection screen, and when the user makes a selection, proceeds to the next step ST44.

[0223] In step ST44, the television receiver 12 determines whether the user gives an instruction to cancel the energy saving mode so as to select the reception of the HDR image. If the user does not want to cancel the energy saving mode, the energy saving mode is not canceled, and then the process proceeds to step ST47 and ends.

[0224] If the user desires to cancel the energy saving mode in step ST44, the television receiver 12 proceeds to the next step ST45. In step ST45, in order to cancel the energy saving mode and thus perform reception of the HDR image, the television receiver 12 sets the VSDB area (reference Fig.14 ) is set to high level "H", the brightness values ​​at the (17+M)th bytes and the (18+M)th bytes are set to the maximum values ​​of the brightness levels that can be displayed on its own display panel 211, and the processing proceeds to the next step ST46. In step ST46, the television receiver 12 cancels the energy saving mode, thereafter proceeds to step ST47, and the processing ends.

[0225] As mentioned above, in Figure 1In the AV system 10 shown, HDR image data is transmitted from a disk player 11 to a television receiver 12 via an HDMI cable 13, and information on a transmission method of the HDR image data and information on gamma correction are transmitted via the same HDMI cable 13, so that transmission of the HDR image data can be performed well. For example, based on the received information on the transmission method and the gamma correction information, the television receiver 12 can appropriately process the received HDR image data.

[0226] In addition, Figure 1 In the AV system 10 shown, a method (such as a transmission method and a gamma correction method of HDR image data) that can be supported by the television receiver 12 can be selected in the disk player 11. For this reason, in the television receiver 12, it is possible to ensure that a decoding process and a gamma correction process are performed on the received HDR image data. In other words, the transmission of HDR image data can be performed well between the disk player 11 and the television receiver 12.

[0227] <2. Modifications>

[0228] Moreover, according to the above embodiment, the disk player 11 inserts the information of the transmission method of HDR image data and the information of gamma correction during the blank period of the image data (picture signal) using the VSIF packet, so that these information are sent to the television receiver 12.

[0229] For example, the disk player 11 can transmit the information of the transmission method of the HDR image data and the information of the gamma correction to the television receiver 12 via the CEC line 24 which is the control data line of the HDMI cable 13. Furthermore, for example, the disk player 11 can transmit the information of the transmission method of the HDR image data and the information of the gamma correction to the television receiver 12 via the bidirectional communication path configured from the reserved line 27 and the HPD line 25 of the HDMI cable 13.

[0230] In addition, according to the above-mentioned embodiment, information on the transmission method and gamma correction method of HDR image data supported by the TV receiver 12 is included in the E-EDID of the TV receiver 12, and the disc player 11 reads the E-EDID via the DDC 23 of the HDMI cable 13 to obtain information on the transmission method and gamma correction method of HDR image data supported by the TV receiver 12.

[0231] However, the disc player 11 can receive information on the transmission method and gamma correction method of HDR image data supported by the television receiver 12 via the CEC line 24 which is the control data line of the HDMI cable 13 or via a bidirectional communication path configured according to the reserved line 27 and HPD line 25 of the HDMI cable 13.

[0232] Furthermore, according to the above-described embodiment, an example is shown in which the disk player 11 transmits both the information of the transmission method of HDR image data and the information of gamma correction to the television receiver 12. However, a configuration in which either one of the two pieces of information is transmitted is also considered.

[0233] In addition, according to the above embodiment, the HDMI transmission path is used. However, in addition to HDMI, as a baseband digital interface, there are mobile high-definition link (MHL), digital video interface (DVI) interface, display port (DP) interface, wireless interface using 60GHz millimeter wave, etc. The present technology can be applied in the same way to the case of sending HDR image data using these digital interfaces.

[0234] [Example of Configuration of DP System]

[0235] Fig.24 300. In the DP system 300, a DP transmitter 301 and a DP receiver 307 are connected to each other through a DP cable 303. In addition, the DP transmitter 301 includes a DP transmission unit 302, and the DP receiver 307 includes a DP reception unit 308 and a storage unit 309.

[0236] DP cable 303 is configured by main link 304, AUX channel 305 and hot plug detection 306. Main link 304 is configured by one, two or four duplex terminated differential signal pairs (pairs), has no dedicated clock signal, and instead the clock is embedded in the 8B / 10B encoded data stream.

[0237] Unlike in HDMI, in the DP interface, the transmission speed and the pixel frequency are independent of each other, and the pixel depth or resolution, the frame frequency, and the presence or absence of voice data or additional data such as DRM information in the transmission stream and the amount of voice data or additional data can be freely adjusted. The transmission of HDR image data, the information of the transmission method of HDR image data, and the transmission of gamma correction information are performed using the main link 304.

[0238] For the transmission data structure of the DP interface, use the TMDS transmission data structure in HDMI (refer to Figure 3 ), and for HDR image data, use Figures 7 to 9 In addition, the information of the transmission method of HDR image data and the information of gamma correction use the data structure with the control period of HDMI 19 (reference Figure 3 ) is inserted into the VSIF packet thus transmitted (reference Fig.15 ) data packet with the same data structure.

[0239] The DP transmitter 301 checks the connection to the DP receiver 307 using the hot plug detection 306. Thereafter, using the AUX channel 305, the DP transmitter 301 reads the HDR image information in the E-EDID from the storage unit 309 of the DP receiver 307 and identifies the transmission method of the HDR image supported by the DP receiver 307. The data structure of the HDR image information in the E-EDID of the DP receiver 307 can be the same as Fig.13 and 14 Same as in.

[0240] In addition, in addition to the main link 304, the DP interface also has a half-duplex bidirectional AUX channel 305, which has a bandwidth of 1 Mbit / s or a bandwidth of 720 Mbit / s, and exchanges information related to functions between the transmitter and the receiver through this bidirectional communication. The AUX channel 305 can be used to perform information on the transmission method of HDR image data and information on the gamma correction method.

[0241] [Example of data structure of AUX channel]

[0242] Fig.25 (a) shows an example of a data packet structure in the case of performing transmission of information of a transmission method of HDR image data and information of a gamma correction method using the AUX channel 305. The data packet is configured by a header, a data area, and a STOP bit. The header is configured by a SYNC area for synchronization, a 4-bit command area, and a 20-bit memory address of the storage unit 309. In addition, the data area is configured by an 8-bit data length area and a payload area of ​​8 bits to 128 bits or 512 bits in length.

[0243] The information of the transmission method of the HDR image data and the information of the gamma correction method are inserted into the payload. When the information of the transmission method of the HDR image data and the information of the gamma correction method are transmitted from the DP transmitter 301 to the DP receiver 307, "0b1000" is set in the command area of ​​the header. Fig.25 As shown in (b), syntax data expressed as "Metadata_tx" is set in the payload area.

[0244] "Continuation_flag" is a bit indicating continuity when the data length of the payload area of ​​one packet is less than the data length of the information of the transmission method of the HDR image data to be transmitted and the information of the gamma correction method, thereby dividing these information into a plurality of packets and transmitting them. "Metadata_type" indicates the method selected by the DP receiver 307 based on the information of the transmission method of the HDR image data and the gamma correction method supported by the DP transmitter 301. "Metadata" sets the information of the transmission method of the HDR image data to be transmitted and the information of the gamma correction method.

[0245] In addition, when obtaining information on the transmission method and gamma correction method of HDR image data supported by the DP receiver 307, the DP transmitter 301 assigns "0b1001" to the command area of ​​the header area. Fig.25 As shown in (c), syntax data expressed as "EDID-read" is set in the payload area. The byte length of the data in the information of the transmission method of the obtained HDR image data and the information of the gamma correction method is set in "HDR_VSDB_length". In this way, in the DP system 300, the information of the transmission method of the HDR image data and the information of the gamma correction method can also be sent in the same way as in the AV system 10 in HDMI.

[0246] [Example of the configuration of the MHL system]

[0247] Fig.26 4 shows a configuration example of an MHL system 400 using an MHL interface. In the MHL system, an MHL transmitter 401 and an MHL receiver 408 are connected to each other through an MHL cable 404. In addition, the MHL transmitter 401 includes a TMDS transmission unit 402 and a storage unit 403, and the MHL receiver 408 includes a TMDS reception unit 409, a storage unit 410, and an EDID-ROM 411.

[0248] The MHL cable 404 is configured by a TMDS channel 405, an MHL link control bus (CBUS) / enhanced MHL link control bus (eCBUS) line 406, and a power MHL voltage bus (VBUS) line 407. The TMDS channel 405 is configured by a pair of differential signal pairs, and performs transmission of HDR image data, information on a transmission method of HDR image data, and information on gamma information.

[0249] For the transmission data structure of the MHL interface, use the TMDS transmission data structure in HDMI (refer to Figure 3 ), and for HDR image data, use Figures 7 to 9In addition, the information of the transmission method of HDR image data and the information of gamma correction use the data structure with the control period 19 in HDMI (reference Figure 3 ) inserted in the VSIF packet (reference Fig.15 ) data packet with the same data structure.

[0250] In the CBUS / eCBUS line 406, when Fig. 27 When the data area of ​​the packet data in is set to 0x64, HPD indicates a high level “1”, and when the data area of ​​the packet data is set to 0x65, HPD indicates a low level “0”. Therefore, the MHL transmitter 401 checks the connection to the MHL receiver 408 via the CBUS / eCBUS line 406.

[0251] Thereafter, the MHL transmitter 401 reads the HDR image information in the E-EDID from the MHL receiver 408 using the CBUS / eCBUS line 406, and identifies the transmission method of the HDR image supported by the MHL receiver 408. The data structure of the HDR image information in the E-EDID in the MHL receiver 408 can be the same as Fig.13 and 14 Same as in.

[0252] [Example of data structure of CBUS line]

[0253] Fig.28 (a) shows the CBUS packet format in the case of performing transmission of information of a transmission method of HDR image data and information of gamma correction via the CBUS / eCBUS line 406. Generally, because the data packet transmitted via the CBUS / eCBUS line 406 is transmitted by multiplexing data having a data length of one byte in a time division manner, a delay occurs when data having a large data length (such as information of a transmission method of HDR image data and information of gamma correction) is transmitted, and the CBUS / eCBUS line 406 is not suitable for data transmission requiring real-time transmission. Therefore, the "block protocol" of the enhanced MHL dedicated communication (eMSC) that can transmit up to 256 bytes of data in blocks is used. This data packet is configured by a 2-byte request command area (0xFF), a response wait NULL area, a START unit, a 256-byte payload area, a 2-byte CRC area, and a response wait NULL area.

[0254] Information on the transmission method of HDR image data and information on gamma correction are inserted into the 256-byte payload area. Fig.28As shown in (b), syntax data expressed as "Metadata_tx" is set in the payload area. "Metadata_type" indicates the method selected by the MHL transmitter 401 based on the information of the transmission method of HDR image data and the gamma correction method supported by the MHL receiver 408. "Metadata" sets the information of the transmission method of the HDR image data to be transmitted and the information of the gamma correction method. In this way, in the MHL system 400, the information of the transmission method of HDR image data and the information of the gamma correction method can also be transmitted in the same way as in the AV system 10 in HDMI.

[0255] Furthermore, according to this embodiment, an example is shown in which the disk player 11 is used as a transmitting device (source device) and the television receiver 12 is used as a receiving device (synchronizing device), but, of course, the present technology can be applied in the same manner even if other transmitting devices and receiving devices are used.

[0256] Furthermore, the present technology can be configured as follows.

[0257] (1) A sending device comprises: a data sending unit for sending high dynamic range image data to an external device via a transmission path; and an information sending unit for sending information on a transmission method of the high dynamic range image data sent in the data sending unit and / or information on gamma correction to the external device via the transmission path.

[0258] (2) The transmission device according to (1), wherein the data transmission unit transmits the image data with a high dynamic range to the external device via the transmission path using a differential signal.

[0259] (3) A sending device according to (2), wherein the information sending unit inserts information on the transmission method of the high dynamic range image data and / or information on gamma correction sent in the data sending unit during a blank period of the high dynamic range image data, thereby sending the inserted information to an external device.

[0260] (4) The transmitting device according to (2), wherein the information transmitting unit transmits information of a transmission method of the high dynamic range image data transmitted in the data transmitting unit and / or information of gamma correction to an external device via a control data line constituting a transmission path.

[0261] (5) A sending device according to (2), wherein the information sending unit sends information on a transmission method of high dynamic range image data sent in the data sending unit and / or information on gamma correction to an external device via a bidirectional communication path configured according to a predetermined line of the transmission path.

[0262] (6) The transmitting device according to (5), wherein the bidirectional communication path is a pair of differential communication paths, and at least one of the pair of differential communication paths has a function of receiving a connection state notification from an external device using a DC bias potential.

[0263] (7) A sending device according to any one of (1) to (6), wherein the high dynamic range image data includes first data and second data, and wherein a data sending unit configures the first data and the second data into a picture format specified for stereoscopic images and sends the picture format to an external device via a transmission path.

[0264] (8) A sending device according to any one of (1) to (6), wherein the high dynamic range image data includes first data and second data, and wherein a data sending unit sends the first data as a first frame image to an external device via a transmission path, and sends the second data as a second frame image to the external device via the transmission path.

[0265] (9) A sending device according to any one of (1) to (6), wherein the high dynamic range image data includes first data and second data, and wherein the first data is low-order 8-bit data of the high dynamic range image data and the second data is high-order bit data of the high dynamic range image data, or the first data is high-order 8-bit data of the high dynamic range image data and the second data is low-order bit data of the high dynamic range image data.

[0266] (10) A sending device according to any one of (1) to (9), wherein information on a transmission method of high dynamic range image data and information on gamma correction sent in a data sending unit includes at least one of the following: information on a maximum white level exceeding 100% of the high dynamic range image data, a bit value when expressed at a black level, a bit value when expressed at a 100% white level, a flag indicating whether processing for a high dynamic range has been performed, a brightness level of a receiving device assumed at a 100% white level, a brightness input level required for increasing the brightness of a high dynamic range image, and an increased brightness output level required for increasing the brightness of a high dynamic range image.

[0267] (11) The sending device according to any one of (1) to (10) further includes: an information receiving unit, which receives information about a transmission method and / or a gamma correction method for high dynamic range image data that can be supported by the external device and is sent from the external device via a transmission path; and a method selection unit, which selects a predetermined transmission method and / or a predetermined gamma correction method from the transmission method and / or gamma correction method for high dynamic range image data that can be supported by the external device based on the information about the transmission method and / or the information about the gamma correction method received in the information receiving unit, wherein the data sending unit sends the high dynamic range image data according to the transmission method and / or the gamma correction method selected in the method selection unit to the external device via the transmission path.

[0268] (12) A method for sending high dynamic range image data, comprising: a data sending step, sending the high dynamic range image data to an external device via a transmission path, and an information sending step, sending information on a transmission method and / or gamma correction information of the high dynamic range image data sent in the data sending step to the external device via the transmission path.

[0269] (13) A program for causing a computer to act as: a data sending component that sends high dynamic range image data to an external device via a transmission path; and an information sending component that sends information on a transmission method of the high dynamic range image data sent in the data sending component and / or information on gamma correction to the external device via the transmission path.

[0270] (14) A receiving device comprises: a data receiving unit, which receives high dynamic range image data for displaying a high dynamic range image from an external device via a transmission path; an information receiving unit, which receives information on a transmission method and / or gamma correction information of the high dynamic range image data received in the data receiving unit from the external device; and a data processing unit, which processes the high dynamic range image data received in the data receiving unit based on the information on the transmission method and / or gamma correction information received in the information receiving unit.

[0271] (15) The receiving device according to (14), wherein the data receiving unit receives the image data of the high dynamic range from the external device via the transmission path using a differential signal.

[0272] (16) The receiving device according to (15), wherein the information receiving unit extracts information on a transmission method of the high dynamic range image data and / or information on gamma correction from a blank period of the high dynamic range image data received in the data receiving unit.

[0273] (17) A receiving device according to (15), wherein the information receiving unit receives information on a transmission method of high dynamic range image data received in the data receiving unit and / or information on gamma correction from an external device via a control data line constituting a transmission path.

[0274] (18) A receiving device according to (15), wherein the information receiving unit receives information on a transmission method and / or gamma correction of high dynamic range image data received in the data receiving unit from an external device via a bidirectional communication path configured according to a predetermined line of the transmission path.

[0275] (19) A receiving device according to (18), wherein the bidirectional communication path is a pair of differential communication paths, and at least one of the pair of differential communication paths has a function of notifying an external device of a connection state using a DC bias potential.

[0276] (20) A receiving device according to any one of (14) to (19), wherein the high dynamic range image data includes first data and second data, and wherein a data sending and receiving unit receives the first data and second data configured in a picture format prescribed for stereoscopic images from an external device via a transmission path.

[0277] (21) A receiving device according to any one of (14) to (19), wherein the high dynamic range image data includes first data and second data, and wherein a data sending and receiving unit receives a first frame image configured according to the first data and a second frame image configured according to the second data from an external device via a transmission path.

[0278] (22) A receiving device according to any one of (14) to (19), wherein the high dynamic range image data includes first data and second data, and wherein the first data is low-order 8-bit data of the high dynamic range image data and the second data is high-order bit data of the high dynamic range image data, or the first data is high-order 8-bit data of the high dynamic range image data and the second data is low-order bit data of the high dynamic range image data.

[0279] (23) The receiving device according to any one of (14) to (22) further includes: a display control unit, which, if the energy saving mode is selected, displays on the display unit whether to cancel the energy saving mode when information on the transmission method of high dynamic range image data sent from an external device is received in the information receiving unit.

[0280] (24) The receiving device according to any one of (14) to (23) further includes: an information storage unit, which stores information on a transmission method and / or a gamma correction method for high dynamic range image data that the information storage unit itself can support; and an information sending unit, which sends the information on the transmission method and / or the information on the gamma correction method stored in the information storage unit to an external device via a transmission path.

[0281] (25) A receiving device according to (24), wherein the information storage unit also stores at least one of information on the maximum brightness that can be displayed, information on the maximum increased brightness level that can be processed for a high dynamic range, and a flag for prohibiting increased processing.

[0282] (26) The receiving device according to (24) or (25) further includes: a storage control unit, which rewrites the flag for prohibiting additional processing stored in the information storage unit to invalid if the flag for prohibiting additional processing is stored in the information storage unit and the energy saving mode is selected.

[0283] (27) The receiving device according to any one of (24) to (26) further includes: a storage control unit, which rewrites the information of the maximum brightness that can be displayed and the information of the maximum increased brightness level that can be processed for a high dynamic range if information of the maximum brightness that can be displayed and the information of the maximum increased brightness level that can be processed for a high dynamic range stored in the information storage unit.

[0284] (28) A method for receiving high dynamic range image data, comprising: a data receiving step, enabling a data receiving unit to receive the high dynamic range image data from an external device via a transmission path; an information receiving step, receiving information on a transmission method and / or gamma correction information of the high dynamic range image data received in the data receiving step from the external device; and a data processing step, processing the high dynamic range image data received in the data receiving step based on the information on the transmission method and / or gamma correction information received in the information receiving step.

[0285] (29) A program for causing a computer to act as: a data receiving component that receives high dynamic range image data for displaying a high dynamic range image from an external device via a transmission path; an information receiving component that receives information on a transmission method and / or gamma correction information of the high dynamic range image data received in a data receiving unit from the external device; and a data processing component that processes the high dynamic range image data received in the data receiving component based on the information on the transmission method and / or gamma correction information received in the information receiving component.

[0286] Label list

[0287] 10. AV System

[0288] 11 disc player

[0289] 11a HDMI terminal

[0290] 11b HDMI Transmitter

[0291] 11c high-speed bus interface

[0292] 12 TV receiver

[0293] 12a HDMI terminal

[0294] 12b HDMI Receiver

[0295] 12c high-speed bus interface

[0296] 13 HDMI cable

[0297] 14 Valid image period

[0298] 15 Horizontal blanking period

[0299] 16 Vertical blanking period

[0300] 17 Video data period

[0301] 18 Data Island Period

[0302] 19 Control period

[0303] 21 HDMI Transmitter

[0304] 22 HDMI Receiver

[0305] 23 DDC lines

[0306] 24 CEC lines

[0307] 25 HPD Line

[0308] 26 Power cord

[0309] 27 Reserved Lines

[0310] 104 CPU

[0311] 105 Internal bus

[0312] 106 Flash ROM

[0313] 107 SDRAM

[0314] 108 Remote control receiving unit

[0315] 109 Remote control sending unit

[0316] 110 SATA interface

[0317] 111 BD drive

[0318] 112 Ethernet interfaces

[0319] 113 Network terminal

[0320] 114 HDR processing circuit

[0321] 115 MPEG decoder

[0322] 116 Graphics Generation Circuit

[0323] 117 Image output terminal

[0324] 118 Voice output terminal

[0325] 121 Display control unit

[0326] 122 Panel drive circuit

[0327] 123 Display Panel

[0328] 124 Power supply unit

[0329] 204 HDR processing circuit

[0330] 205 Antenna terminal

[0331] 206 Digital Tuner

[0332] 207 MPEG decoder

[0333] 208 Image signal processing circuit

[0334] 209 Graphics Generation Circuit

[0335] 210 Panel drive circuit

[0336] 211 Display Panel

[0337] 212 Voice Signal Processing Circuit

[0338] 213 Voice Amplifier Circuit

[0339] 214 Speakers

[0340] 220 Internal bus

[0341] 221 CPU

[0342] 222 Flash ROM

[0343] 223 DRAM

[0344] 224 Ethernet interface

[0345] 225 Network terminal

[0346] 226 Remote Control Receiver Unit

[0347] 227 Remote control sending unit

[0348] 231 Display control unit

[0349] 232 Power supply unit

[0350] 300 DP System

[0351] 301 DP transmitter

[0352] 302 DP sending unit

[0353] 303 DP Cable

[0354] 304 Main Link

[0355] 305 AUX channels

[0356] 306 Hot plug detection

[0357] 307 DP Receiver

[0358] 308 DP receiving unit

[0359] 309 Storage Unit

[0360] 400 MHL System

[0361] 401 MHL Transmitter

[0362] 402 TMDS transmitter unit

[0363] 403 Storage Unit

[0364] 404 MHL Cable

[0365] 405 TMDS channels

[0366] 406 CBUS / eCBUS lines

[0367] 407 VBUS line

[0368] 408 MHL Receiver

[0369] 409 TMDS Receiver Unit

[0370] 410 Storage Unit

[0371] 411 EDID ROM

Claims

1. A display device, comprising: a storage unit including capability information of the display device; Panel driving circuit; as well as Display panel, The display device is configured to receive a high dynamic range signal including image data of a high dynamic range from an external device through an interface terminal via a transmission path, and receive information on gamma correction of the image data of the high dynamic range in an information frame data packet, and wherein the interface terminal is configured to send a plurality of information on gamma correction from the storage unit that the display device can process to display a high dynamic range image on the display panel to the external device, wherein the received information on gamma correction is selected from the plurality of information on gamma correction; The storage unit is an EDID memory, and the data information from the storage unit includes the plurality of information on gamma correction and the name of the display device.

2. The display device according to claim 1, wherein: The interface terminal includes a display port DP terminal.

3. The display device according to claim 1 or 2, wherein: The information frame data packet is a manufacturer-specific information frame data packet.

4. The display device according to claim 1 or 2, wherein: The information frame data packet is an auxiliary video AV information frame data packet.

5. The display device according to claim 1 or 2, wherein: The information frame data packet is arranged in a data island period allocated to a part of a horizontal blank period and a vertical blank period of the image data.

6. The display device according to claim 3, wherein: High dynamic range information is sent with the vendor specific information frame data packet.

7. The display device according to claim 1 or 2, wherein: High dynamic range image data for displaying a high dynamic range image is configured in a deep color image format.

8. The display device according to claim 1 or 2, wherein: The information in the information frame data packet includes an extended maximum brightness of the display device.

9. The display device according to claim 8, wherein: The extended maximum brightness of the display device is expressed in cd / m 2 As unit.

10. The display device according to claim 1 or 2, wherein: EDID data consists of a basic block and an extended block, and the extended block includes resolution, frame rate, or information indicating whether the display device has interlaced or progressive capabilities.

11. A display device, comprising: a storage unit including capability information of the display device; Panel driving circuit; as well as Display panel, The display device is configured to receive a high dynamic range signal including image data of a high dynamic range from a transmitting device through an interface receiving unit via a transmission path, and receive information on gamma correction of the image data of the high dynamic range in an information frame data packet, wherein the received information on gamma correction is selected from a plurality of information on gamma correction, and the display device is capable of processing the plurality of information on gamma correction to display a high dynamic range image on the display panel; and The storage unit is an EDID memory, and the data information from the storage unit includes the name of the display device.

12. The display device according to claim 11, wherein: The interface receiving unit includes a display port DP terminal.

13. The display device according to claim 11 or 12, wherein: The infoframe data packet is a vendor-specific infoframe data packet including information on gamma correction of the high dynamic range image data.

14. The display device according to claim 11 or 12, wherein: The information frame data packet is an auxiliary video AV information frame data packet.

15. The display device according to claim 11 or 12, wherein: The information frame data packet is arranged in a data island period allocated to a part of a horizontal blank period and a vertical blank period of the image data.

16. The display device according to claim 13, wherein: High dynamic range information is sent with the vendor specific information frame data packet.

17. The display device according to claim 11 or 12, wherein: High dynamic range image data for displaying a high dynamic range image is configured in a deep color image format.

18. The display device according to claim 11 or 12, wherein: The information in the information frame data packet includes an extended maximum brightness of the display device.

19. The display device according to claim 18, wherein: The extended maximum brightness of the display device is expressed in cd / m 2 As unit.

20. The display device according to claim 11 or 12, wherein: EDID data consists of a basic block and an extended block, and the extended block includes resolution, frame rate, or information indicating whether the display device has interlaced or progressive capabilities.

21. A method for receiving high dynamic range image data, comprising: a data receiving step, enabling a data receiving unit to receive the high dynamic range image data from an external device via a transmission path; an information receiving step of receiving, from the external device, information on gamma correction of the high dynamic range image data received in the data receiving step, wherein the received information on gamma correction is selected from a plurality of information on gamma correction, and the data processing step is capable of processing the plurality of information on gamma correction to display a high dynamic range image; a data processing step of processing the high dynamic range image data received in the data receiving step based on the information about gamma correction received in the information receiving step; as well as an information storing step of storing at least one of information on a maximum brightness that can be displayed and information on a maximum increased brightness level that can be processed for a high dynamic range, The data receiving unit includes the name of the receiving unit in the EDID sent by the receiving unit to the external device.

22. An apparatus for causing a computer to act as: a data receiving section that receives high dynamic range image data for displaying a high dynamic range image from an external device via a transmission path; an information receiving unit that receives, from the external device, information on gamma correction of the high dynamic range image data received in the data receiving unit, wherein the received information on gamma correction is selected from a plurality of information on gamma correction, and the data processing unit is capable of processing the plurality of information on gamma correction to display a high dynamic range image; a data processing component, processing the high dynamic range image data received in the data receiving component based on the information about gamma correction received in the information receiving component; as well as an information storage unit storing at least one of information on a maximum brightness that can be displayed and information on a maximum increased brightness level that can be processed for a high dynamic range, The information storage component includes the name of the information storage component in the EDID sent by the receiving unit to the external device.

23. A receiving device, comprising: a data receiving unit that receives high dynamic range image data for displaying a high dynamic range image from an external device via a transmission path; an information receiving unit that receives, from the external device, information on gamma correction of the high dynamic range image data received in the data receiving unit, wherein the received information on gamma correction is selected from a plurality of information on gamma correction, and the receiving device is capable of processing the plurality of information on gamma correction to display a high dynamic range image; as well as a data processing unit, which processes the high dynamic range image data received in the data receiving unit based on the information about gamma correction received in the information receiving unit, The receiving device includes the name of the receiving device in the EDID sent by the receiving device to the external device.

24. The receiving device according to claim 23, in, The data receiving unit receives the high dynamic range image data from the external device via the transmission path using a differential signal.

25. The receiving device according to claim 23 or 24, in, The information receiving unit extracts the information on gamma correction of the image data with a high dynamic range from a blank period of the image data with a high dynamic range received in the data receiving unit.

26. The receiving device according to claim 24, in, The information receiving unit receives the information on gamma correction of the image data with a high dynamic range received in the data receiving unit from the external device via a control data line constituting the transmission path.

27. The receiving device according to claim 24, in, The information receiving unit receives the information on gamma correction of the image data of the high dynamic range received in the data receiving unit from the external device via a bidirectional communication path configured according to a predetermined line of the transmission path.

28. The receiving device according to claim 27, in, The bidirectional communication path is a pair of differential communication paths, and at least one of the pair of differential communication paths has a function of notifying the external device of a connection state using a DC bias potential.

29. The receiving device according to claim 23 or 24, in, The high dynamic range image data includes first data and second data, and The data receiving unit receives the first data and the second data configured in a picture format prescribed for stereoscopic images from the external device via the transmission path.

30. The receiving device according to claim 24, in, The high dynamic range image data includes first data and second data, and The data receiving unit receives a first frame image configured according to the first data and a second frame image configured according to the second data from the external device via the transmission path.

31. The receiving device according to claim 23 or 24, in, The high dynamic range image data includes first data and second data, and Among them, the first data is the low-order 8-bit data of the high dynamic range image and the second data is the high-order bit data of the high dynamic range image, or the first data is the high-order 8-bit data of the high dynamic range image data and the second data is the low-order bit data of the high dynamic range image data.

32. The receiving device according to claim 23, wherein the information receiving unit further receives information about a transmission method of the high dynamic range image data, and the receiving device further comprises: The display control unit, if the power saving mode is selected, performs display on the display unit whether to cancel the power saving mode when the information on the transmission method of the high dynamic range image data transmitted from the external device is received in the information receiving unit.

33. The receiving device according to claim 23, further comprising: An information storage unit storing information on a gamma correction method for the image data of the high dynamic range that the information storage unit itself can support; as well as an information sending unit that sends the information on the gamma correction method stored in the information storage unit to the external device via the transmission path, The at least one piece of information is in EDID.

34. The receiving device according to claim 33, in, The information storage unit also stores at least one of information on a maximum brightness that can be displayed, information on a maximum increased brightness level at which processing for a high dynamic range can be performed, and a flag for prohibiting increased processing.

35. The receiving device according to claim 23, further comprising: The storage control unit rewrites the flag for prohibiting the adding process stored in the information storage unit to be invalid if the flag for prohibiting the adding process is stored in the information storage unit and the energy saving mode is selected.

36. The receiving device according to claim 23, further comprising: A storage control unit is configured to rewrite the information of the maximum brightness that can be displayed and the information of the maximum increased brightness level that can be processed for a high dynamic range if the information of the maximum brightness that can be displayed and the information of the maximum increased brightness level that can be processed for a high dynamic range stored in the information storage unit.

37. A method for receiving high dynamic range image data, comprising: a data receiving step, enabling a data receiving unit to receive the high dynamic range image data from an external device via a transmission path; an information receiving step of receiving, from the external device, information on gamma correction of the high dynamic range image data received in the data receiving step, wherein the received information on gamma correction is selected from a plurality of information on gamma correction, and the data processing step is capable of processing the plurality of information on gamma correction to display a high dynamic range image; as well as a data processing step of processing the high dynamic range image data received in the data receiving unit based on the information about gamma correction received in the information receiving step, The data receiving unit includes the name of the data receiving unit in the EDID sent by the data receiving unit to the external device.

38. A non-transitory recording medium configured to store a program and an EDID including a name of a display device associated with the medium executable by a computer, the program comprising: receiving high dynamic range image data for displaying a high dynamic range image from an external device via a transmission path; receiving information on gamma correction of the high dynamic range image data from the external device, wherein the received information on gamma correction is selected from a plurality of information on gamma correction, and the program is capable of processing the plurality of information on gamma correction to display a high dynamic range image; as well as The high dynamic range image data is processed based on the information about the gamma correction.

Images