Display device

Abstract

To enable a display of a content having a wide dynamic range of luminance to be displayed with appropriate brightness.SOLUTION: According to an embodiment of the present technology, there is provided a display device including: a memory including an EDID including video resolution information; an interface configured to output luminance performance information of a display part to a playback device and receive video data and luminance characteristic information from the playback device; a circuit configured to control a display of a video image based on the received video data and the luminance characteristic information; and a user interface configured to display a menu screen and select whether to perform an adjustment of luminance of the video image by the display part. The video data is processed by the playback device based on the luminance performance information, the received video data is the processed video data, and the luminance characteristic information indicates a luminance characteristic. The present technology can be applied to a television receiver.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present technology relates to a display device, and more particularly to a display device that can display content with a wide dynamic range of luminance at an appropriate brightness. [Background technology]

[0002] Blu-ray (registered trademark) Disc (hereinafter referred to as BD) is a recording medium for content such as movies. Conventionally, authoring of videos to be recorded on BD has been done at a standard brightness (100 nit = 100 cd / m 2 The dynamic range of the master video is compressed, assuming that it will be viewed on a monitor.

[0003] The master video is shot with a high-quality camera and has a dynamic range greater than that which can be displayed on a standard brightness monitor. By compressing the master video, the dynamic range is inevitably lost. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-58692 [Patent Document 2] Japanese Patent Application Laid-Open No. 2009-89209 Summary of the Invention [Problem to be solved by the invention]

[0005] With the advancement of display technologies such as organic electroluminescence (EL) displays and liquid crystal displays (LCDs), monitors with brightness levels higher than the standard, such as 500 nits or 1000 nits, are now available on the market, and there is a demand for content that can take advantage of the performance of monitors with such a wide dynamic range.

[0006] The present technology has been made in view of such circumstances, and makes it possible to display content with a wide dynamic range of brightness at an appropriate brightness. [Means for solving the problem]

[0007] A display device according to one aspect of the present technology includes: a memory including EDID containing video resolution information; an interface that outputs brightness performance information of a display unit to a playback device and receives video data and brightness characteristic information from the playback device; a circuit that controls the display of video based on the received video data and the brightness characteristic information; and a user interface that displays a menu screen and selects whether to adjust the brightness of the video using the display unit, wherein the video data is processed by the playback device based on the brightness performance information, the received video data is processed video data, and the brightness characteristic information represents brightness characteristics.

[0008] In a display device according to one aspect of the present technology, an EDID including video resolution information is stored, brightness performance information of a display unit is output to a playback device, video data and brightness characteristic information are received from the playback device, video display is controlled based on the received video data and the brightness characteristic information, a menu screen is displayed, and whether or not to adjust the brightness of the video is selected by the display unit. Also, the video data is processed by the playback device based on the brightness performance information, the received video data is processed video data, and the brightness characteristic information represents brightness characteristics. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a diagram showing an example of the configuration of a recording and reproduction system according to an embodiment of the present technology. [Figure 2] FIG. 10 is a diagram illustrating an example of signal processing in mode-i. [Figure 3]FIG. 10 is a diagram showing the flow of signals processed in mode-i. [Figure 4] FIG. 10 is a diagram illustrating an example of signal processing in mode-ii. [Figure 5] FIG. 10 is a diagram showing the flow of signals processed in mode-ii. [Figure 6] FIG. 1 is a diagram illustrating the structure of an access unit of HEVC. [Figure 7] FIG. 10 is a diagram illustrating the syntax of Tone mapping information. [Figure 8] 10A to 10C are diagrams illustrating examples of information used as tone mapping definition information and HDR information. [Figure 9] FIG. 10 is a diagram showing an example of a tone curve indicated by Tone mapping information where tone_map_model_id=0. [Figure 10] A figure showing an example of a step function indicated by Tone mapping information for tone_map_model_id=2. [Figure 11] A figure showing an example of a broken line function indicated by Tone mapping information for tone_map_model_id=3. [Figure 12] FIG. 10 is a diagram illustrating an example of each piece of information included in HDR information. [Figure 13] FIG. 10 is a diagram showing an example of a management structure of an AV stream in the BD-ROM format. [Figure 14] FIG. 1 is a diagram showing the structure of a main path and a sub path. [Figure 15] FIG. 2 is a diagram illustrating an example of a file management structure. [Figure 16] FIG. 10 is a diagram showing the syntax of a PlayList file. [Figure 17] FIG. 10 is a diagram illustrating the syntax of a Clip Information file. [Figure 18] FIG. 18 is a diagram illustrating the syntax of ProgramInfo() in FIG. 17. [Figure 19]FIG. 19 is a diagram illustrating the syntax of StreamCodingInfo in FIG. 18. [Figure 20] FIG. 1 is a block diagram illustrating an example of the configuration of a recording device. [Figure 21] FIG. 21 is a block diagram showing an example of the configuration of an encoding processing unit in FIG. 20. [Figure 22] FIG. 10 is a diagram illustrating an example of signal processing by an HDR-STD conversion unit. [Figure 23] FIG. 10 is a diagram illustrating an example of tone mapping. [Figure 24] FIG. 1 is a block diagram illustrating an example of the configuration of a playback device. [Figure 25] 25 is a block diagram showing an example of the configuration of a decoding processing unit in FIG. 24. FIG. [Figure 26] FIG. 1 is a block diagram showing an example of the configuration of a display device. [Figure 27] 10 is a flowchart illustrating a recording process of the recording device. [Figure 28] 28 is a flowchart illustrating the encoding process in mode-i performed in step S2 of FIG. 27. [Figure 29] 28 is a flowchart illustrating the encoding process in mode-ii performed in step S3 of FIG. 27. [Figure 30] 28 is a flowchart illustrating a Database information generation process performed in step S4 of FIG. 27. [Figure 31] 10 is a flowchart illustrating a playback process of the playback device. [Figure 32] 32 is a flowchart illustrating the decoding process in mode-i performed in step S44 of FIG. 31. [Figure 33] 32 is a flowchart illustrating the decoding process in mode-ii performed in step S45 of FIG. 31. [Figure 34] 10 is a flowchart illustrating a display process of the display device. [Figure 35]FIG. 17 is a diagram showing an example of the syntax of AppInfoPlayList() included in the PlayList file of FIG. 16. [Figure 36] FIG. 17 is a diagram showing the syntax of PlayList() included in the PlayList file of FIG. 16. [Figure 37] FIG. 37 is a diagram showing the syntax of PlayItem() in FIG. 36. [Figure 38] FIG. 38 is a diagram showing the syntax of STN_table() in FIG. 37. [Figure 39] FIG. 39 is a diagram illustrating the syntax of stream_attributes() in FIG. 38. [Figure 40] FIG. 10 is a diagram illustrating an example of PSR allocation. [Figure 41] FIG. 10 is a diagram illustrating an example of signal processing in mode-i when the brightness of HDR video is adjusted on the playback device side. [Figure 42] A figure showing an example of signal processing in mode-ii when the brightness of HDR video is adjusted on the playback device side. [Figure 43] FIG. 26 is a block diagram showing an example configuration of the HDR video output unit of FIG. 25. [Figure 44] 32 is a flowchart illustrating the decoding process in mode-i performed in step S44 of FIG. 31. [Figure 45] 32 is a flowchart illustrating the decoding process in mode-ii performed in step S45 of FIG. 31. [Figure 46] 10 is a flowchart illustrating a display process of the display device. [Figure 47] FIG. 10 is a diagram illustrating an example of recognition based on information transmitted and received via HDMI. [Figure 48] FIG. 10 is a diagram showing another example of recognition based on information transmitted and received via HDMI. [Figure 49] FIG. 10 is a diagram illustrating an example of an HDR EDID. [Figure 50] FIG. 1 is a diagram illustrating an example of an HDR InfoFrame. [Figure 51]10 is a flowchart illustrating HDR EDID setting processing of the display device. [Figure 52] 10 is a flowchart illustrating a playback process of the playback device. [Figure 53] 53 is a flowchart illustrating the HDR raw output process performed in step S227 of FIG. 52. [Figure 54] 53 is a flowchart illustrating the HDR·cooked output process performed in step S228 of FIG. 52. [Figure 55] 53 is a flowchart illustrating the STD output process performed in step S229 of FIG. 52. [Figure 56] 10 is a flowchart illustrating a display process of the display device. [Figure 57] FIG. 1 is a block diagram illustrating an example of the configuration of a computer. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present technology will be described in the following order. 1. Recording and playback system 2. About HEVC 3. About the BD format 4. Configuration of each device 5. Operation of each device 6. Variations 7. Example of adjusting brightness on the playback device 8. Example of application to HDMI 9. Other Variations

[0011] <1. Recording and playback system> FIG. 1 is a diagram showing an example of the configuration of a recording and reproducing system according to an embodiment of the present technology.

[0012] 1 is composed of a recording device 1, a playback device 2, and a display device 3. The playback device 2 and the display device 3 are connected via an HDMI (registered trademark) (High Definition Multimedia Interface) cable 4. The playback device 2 and the display device 3 may also be connected via a cable of another standard, or via wireless communication.

[0013] The recording device 1 records content, and the playback device 2 plays back the content. The content is provided from the recording device 1 to the playback device 2 using an optical disc 11. The optical disc 11 is a disc on which content is recorded in, for example, a BD-ROM (Blu-ray (registered trademark) Disc Read-Only) format.

[0014] The content may be recorded on the optical disc 11 in other formats such as BD-R, -RE, etc. Furthermore, the content may be provided from the recording device 1 to the playback device 2 using removable media other than an optical disc, such as a memory card equipped with a flash memory.

[0015] If the optical disc 11 is a BD-ROM disc, the recording device 1 is, for example, a device used by a content author. In the following, the description will be given assuming that the optical disc 11 on which the content is recorded by the recording device 1 is provided to the playback device 2. However, in reality, optical discs are duplicated based on a master disc on which the content is recorded by the recording device 1, and one of these optical discs, the optical disc 11, is provided to the playback device 2.

[0016] HDR (High Dynamic Range) video, which is video having a dynamic range (brightness range) greater than or equal to the dynamic range that can be displayed on a monitor with standard brightness, is input to the recording device 1. The standard brightness is, for example, 100 cd / m 2 (=100nits).

[0017] The recording device 1 records the input master HDR video as is, that is, as video having a dynamic range equal to or greater than the dynamic range that can be displayed on a monitor with standard brightness, onto the optical disc 11. In this case, the optical disc 11 also records information indicating the brightness characteristics of the master HDR video and information used when converting the HDR video to STD video.

[0018] Standard video (STD video) is video with a dynamic range that can be displayed on a monitor with standard brightness. If the dynamic range of standard video is 0-100%, the dynamic range of HDR video is expressed as a range from 0% to 101% or more, such as 0-500%, 0-1000%, etc.

[0019] Furthermore, the recording device 1 converts the input master HDR video into STD video, that is, into video having a dynamic range that can be displayed on a monitor with standard brightness, and records the video on the optical disc 11. In this case, the optical disc 11 also records information indicating the brightness characteristics of the master HDR video and information used when converting the STD video into HDR video.

[0020] The HDR video recorded by the recording device 1, or the STD video obtained by converting the HDR video, is a so-called 4K resolution video with a horizontal and vertical resolution of, for example, 4096 x 2160 or 3840 x 2160 pixels. The recording device 1 encodes the video data using, for example, HEVC (High Efficiency Video Coding).

[0021] Information indicating the luminance characteristics of the master HDR video and information used when converting HDR video to STD video or STD video to HDR video are inserted into the HEVC encoded data as SEI (Supplemental Enhancement Information). The HEVC stream with the SEI inserted into the HEVC encoded data is recorded on the optical disc 11 in BD format.

[0022] The playback device 2 communicates with the display device 3 via the HDMI cable 4 and acquires information about the display performance of the display device 3. The playback device 2 determines whether the display device 3 is a device with an HDR monitor that is capable of displaying HDR video, or a device with a STD monitor that is only capable of displaying STD video.

[0023] Furthermore, the playback device 2 drives the drive, reads out the HEVC stream recorded on the optical disc 11, and decodes it.

[0024] For example, if the video data obtained by decoding is HDR video data and the display device 3 has an HDR monitor, the playback device 2 outputs the HDR video data obtained by decoding the HEVC stream to the display device 3. In this case, the playback device 2 outputs information indicating the luminance characteristics of the master HDR video to the display device 3 along with the HDR video data.

[0025] On the other hand, if the video data obtained by decoding is HDR video data and the display device 3 has a STD monitor, the playback device 2 converts the HDR video obtained by decoding the HEVC stream into STD video and outputs the STD video data. The conversion of HDR video to STD video is performed using information recorded on the optical disc 11 that is used when converting HDR video to STD video.

[0026] When the video data obtained by decoding is STD video data and the display device 3 has an HDR monitor, the playback device 2 converts the STD video obtained by decoding the HEVC stream into HDR video and outputs the HDR video data to the display device 3. The conversion of the STD video into HDR video is performed using information that is recorded on the optical disc 11 and that is used when converting STD video to HDR video. In this case, the playback device 2 outputs information indicating the luminance characteristics of the master HDR video to the display device 3, along with the HDR video.

[0027] On the other hand, if the video data obtained by decoding is STD video data and the display device 3 has an STD monitor, the playback device 2 outputs the STD video data obtained by decoding the HEVC stream to the display device 3.

[0028] The display device 3 receives the video data transmitted from the playback device 2 and displays the video of the content on a monitor. The playback device 2 also transmits audio data of the content. The display device 3 outputs the audio of the content from a speaker based on the audio data transmitted from the playback device 2.

[0029] For example, if information indicating the luminance characteristics of the master HDR video is transmitted together with the video data, the display device 3 recognizes that the video data transmitted from the playback device 2 is HDR video data. As described above, information indicating the luminance characteristics of the master HDR video is transmitted together with the HDR video data to the display device 3 that has an HDR monitor.

[0030] In this case, display device 3 displays the HDR video image according to the characteristics specified by the information indicating the luminance characteristics of the master HDR video. That is, if the display device 3's own monitor has a dynamic range of 0-500%, and the information indicating the luminance characteristics of the master HDR video specifies that the dynamic range of the HDR video has a predetermined characteristic of 0-500%, display device 3 adjusts the luminance within the range of 0-500% according to the predetermined characteristic and displays the image.

[0031] By being able to specify the brightness characteristics of the master HDR video, content authors can display the video with the brightness they intended.

[0032] Typically, display devices such as TVs recognize externally input video as video with a dynamic range of 0-100%. Furthermore, if the display device's own monitor has a wider dynamic range, it will automatically expand the brightness to display the image according to the monitor's characteristics. By specifying brightness characteristics and adjusting the brightness of HDR video according to the specified characteristics, it is possible to prevent brightness adjustments made by the display device without the author's intention.

[0033] Furthermore, playback devices that output video to display devices such as TVs typically convert the brightness according to the characteristics of the transmission path before outputting the video. The display device that receives the video then converts the brightness of the received video according to the monitor's characteristics and displays the image. By outputting HDR video directly from the playback device 2 to the display device 3 without converting the brightness in the playback device 2, the number of brightness conversions can be reduced, enabling the display device 3 to display an image with a brightness closer to the master.

[0034] On the other hand, if the video data transmitted from the playback device 2 is STD video data, the display device 3 displays the STD video image. The fact that STD video is transmitted from the playback device 2 means that the display device 3 is a device that has a STD monitor.

[0035] Hereinafter, the mode in which the master HDR video is recorded as HDR video on the optical disc 11 will be referred to as mode-i where appropriate. In mode-i, information indicating the luminance characteristics of the master HDR video and information used when converting the HDR video to STD video are recorded on the optical disc 11.

[0036] Additionally, mode-ii refers to a mode in which a master HDR video is converted into STD video and recorded on the optical disc 11. In mode-ii, information indicating the luminance characteristics of the master HDR video and information used when converting the STD video into HDR video are recorded on the optical disc 11.

[0037] [Signal processing in mode-i] FIG. 2 is a diagram showing an example of signal processing in mode-i.

[0038] The left side of the solid line L1 indicates the encoding process performed in the recording device 1, and the right side of the solid line L2 indicates the decoding process performed in the playback device 2.

[0039] When a master HDR video is input, the recording device 1 detects the luminance of the master HDR video and generates HDR information that indicates the luminance characteristics of the master HDR video, as indicated by the tip of arrow #1. The recording device 1 also encodes the master HDR video using HEVC, as indicated by the tip of arrow #2.

[0040] As indicated by the arrow #3, the recording device 1 converts the master HDR video into STD video. The STD video image obtained after conversion is displayed on a monitor (not shown). The conversion of HDR video into STD video is performed while the author visually checks the converted STD video image and adjusts the conversion parameters as appropriate.

[0041] Based on the adjustments made by the author, the recording device 1 generates tone mapping definition information for HDR-STD conversion, which is information used when converting HDR video to STD video, as indicated by the tip of arrow #4.

[0042] Tone mapping definition information is information that defines the correspondence between each pixel value indicating brightness in a dynamic range such as 0-400%, which is wider than the standard dynamic range, and each pixel value indicating brightness in the standard dynamic range of 0-100%.

[0043] As indicated by arrow #5, the recording device 1 inserts the HDR information and tone mapping definition information as SEI into the HEVC encoded data to generate an HEVC stream. The recording device 1 records the generated HEVC stream on an optical disc 11 in BD format and provides it to the playback device 2 as indicated by arrow #11.

[0044] In this way, information indicating the luminance characteristics of the master HDR video and information used when converting the HDR video to STD video are provided to the playback device 2 by inserting them into the stream using the HEVC SEI.

[0045] The playback device 2 reads the HEVC stream from the optical disc 11, and extracts HDR information and tone mapping definition information from the SEI of the HEVC stream, as indicated by the tips of arrows #21 and #22.

[0046] Furthermore, the playback device 2 decodes the HEVC encoded data, as indicated by the tip of arrow #23. If the display device 3 has an HDR monitor, the playback device 2 adds HDR information to the HDR video data obtained by decoding the encoded data, as shown at the end of arrow #24, and outputs it to the display device 3, as shown at the end of arrow #25.

[0047] On the other hand, if the display device 3 has an STD monitor, the playback device 2 converts the HDR video obtained by decoding the encoded data into STD video using the tone mapping definition information for HDR-STD conversion extracted from the HEVC stream, as indicated by arrow #26. The playback device 2 outputs the STD video data obtained by the conversion to the display device 3, as indicated by arrow #27.

[0048] In this way, the HDR video data obtained by decoding the HEVC encoded data is output together with HDR information to the display device 3 having an HDR monitor. Also, the HDR video data obtained by decoding the HEVC encoded data is converted to STD video, and then output to the display device 3 having an STD monitor.

[0049] FIG. 3 is a diagram showing the flow of processing from when the master HDR video is input to the recording device 1 until the video data is output from the playback device 2.

[0050] As indicated by the tip of white arrow #51, the master HDR video is provided to the playback device 2 together with HDR information generated in the recording device 1 based on the master HDR video and tone mapping definition information for HDR-STD conversion. The HDR information includes, for example, information indicating that the dynamic range has been expanded to a range of 0-400%.

[0051] If the display device 3 has an HDR monitor, HDR information is added to HDR video data obtained by decoding the HEVC encoded data in the playback device 2, as indicated by arrows #52 and #53. The HDR video data with the HDR information added is output to the display device 3, as indicated by arrow #54.

[0052] On the other hand, if the display device 3 has an STD monitor, in the playback device 2, as indicated by arrows #55 and #56, the HDR video obtained by decoding the HEVC encoded data is converted into STD video using tone mapping definition information for HDR-STD conversion. The STD video data obtained by conversion is output to the display device 3, as indicated by arrow #57. In Figure 3, the amplitude of the waveform representing the HDR video and the amplitude of the waveform representing the STD video each indicate a dynamic range.

[0053] Thus, in mode-i, the master HDR video is recorded as HDR video on the optical disc 11. Furthermore, depending on the performance of the display device 3 that is the output destination, it is possible to switch between outputting the HDR video obtained by decoding the encoded data as is with HDR information added, or outputting the HDR video after converting it to STD video.

[0054] [Signal processing in mode-II] FIG. 4 is a diagram illustrating an example of signal processing in mode-ii.

[0055] When a master HDR video is input, the recording device 1 detects the luminance of the master HDR video and generates HDR information as indicated by the tip of arrow #71.

[0056] As indicated by the tip of arrow #72, the recording device 1 converts the master HDR video into STD video. The STD video image obtained through the conversion is displayed on a monitor (not shown).

[0057] Based on the adjustments made by the author, the recording device 1 generates tone mapping definition information for STD-HDR conversion, which is information used when converting STD video into HDR video, as indicated by the tip of arrow #73.

[0058] Furthermore, as indicated by the tip of arrow #74, the recording device 1 encodes the STD video obtained by converting the master HDR video in HEVC.

[0059] As indicated by arrow #75, recording device 1 inserts HDR information and tone mapping definition information as SEI into HEVC encoded data to generate an HEVC stream. Recording device 1 records the generated HEVC stream on optical disc 11 in BD format and provides it to playback device 2 as indicated by arrow #91.

[0060] The playback device 2 reads the HEVC stream from the optical disc 11, and extracts HDR information and tone mapping definition information from the SEI of the HEVC stream, as indicated by the tips of arrows #101 and #102.

[0061] Furthermore, playback device 2 decodes the HEVC encoded data, as indicated by arrow #103. If display device 3 has an STD monitor, playback device 2 outputs the STD video data obtained by decoding the encoded data to display device 3, as indicated by arrow #104.

[0062] On the other hand, if the display device 3 has an HDR monitor, the playback device 2 converts the STD video obtained by decoding the encoded data into HDR video using the tone mapping definition information for STD-HDR conversion extracted from the HEVC stream, as indicated by arrow #105. The playback device 2 adds HDR information to the HDR video data obtained by conversion, as indicated by arrow #106, and outputs the HDR video to the display device 3, as indicated by arrow #107.

[0063] In this way, the STD video data obtained by decoding the HEVC encoded data is converted into HDR video and then output together with HDR information to the display device 3 having an HDR monitor. Also, the STD video data obtained by decoding the HEVC encoded data is output as is to the display device 3 having an STD monitor.

[0064] FIG. 5 is a diagram showing the flow of processing from when the master HDR video is input to the recording device 1 until the video data is output from the playback device 2.

[0065] The master HDR video is converted to STD video, as indicated by the tip of the white arrow #121, and then provided to the playback device 2 together with HDR information generated in the recording device 1 based on the master HDR video and tone mapping definition information for STD-HDR conversion.

[0066] If the display device 3 has an HDR monitor, the playback device 2 converts the STD video obtained by decoding the HEVC encoded data into HDR video using tone mapping definition information for STD-HDR conversion, as indicated by arrows #122 and #123. Also, as indicated by arrows #124 and #125, HDR information is added to the HDR video data obtained by converting the STD video, and the HDR video data is output to the display device 3, as indicated by arrow #126.

[0067] On the other hand, if the display device 3 has an STD monitor, the playback device 2 outputs the STD video obtained by decoding the HEVC encoded data to the display device 3, as indicated by the tip of arrow #127.

[0068] In this way, in mode-ii, the master HDR video is converted into STD video and recorded on the optical disc 11. Furthermore, depending on the performance of the display device 3 that is the output destination, the STD video obtained by decoding the encoded data is converted into HDR video, and it is possible to switch between adding HDR information to the converted video and outputting it, or outputting the STD video as is.

[0069] The configurations and operations of the recording device 1 and playback device 2 described above will be described in detail later.

[0070] <2.About HEVC> Here, HEVC will be explained.

[0071] FIG. 6 is a diagram showing the structure of an access unit in HEVC.

[0072] An HEVC stream is composed of access units, which are a collection of Network Abstraction Layer (NAL) units. One access unit contains video data for one picture.

[0073] As shown in Figure 6, one access unit consists of an AU delimiter (Access Unit delimiter), a VPS (Video Parameter Set), an SPS (Sequence Parameter Set), a PPS (Picture Parameter Set), an SEI, a VCL (Video Coding Layer), an EOS (End of Sequence), and an EOS (End of Stream).

[0074] The AU delimiter indicates the beginning of an access unit. The VPS contains metadata that describes the contents of the bitstream. The SPS contains information that the HEVC decoder needs to refer to throughout the sequence decoding process, such as picture size and CTB (Coding Tree Block) size. The PPS contains information that the HEVC decoder needs to refer to in order to perform picture decoding. The VPS, SPS, and PPS are used as header information.

[0075] SEI is auxiliary information that includes timing information for each picture and information about random access. HDR information and tone mapping definition information are included in Tone mapping information, which is one type of SEI. VCL is the data for one picture. EOS (End of Sequence) indicates the end position of the sequence, and EOS (End of Stream) indicates the end position of the stream.

[0076] FIG. 7 is a diagram showing the syntax of Tone mapping information.

[0077] Using the Tone mapping information, the brightness and color of the decoded picture are converted to match the performance of the monitor to which the picture is output. Note that the line numbers and colons (:) on the left side of Figure 7 are shown for convenience of explanation and are not information contained in the Tone mapping information. The main information contained in the Tone mapping information will be explained below.

[0078] The tone_map_id in the second line is identification information for the Tone mapping information. The tone_map_id identifies the purpose of the Tone mapping information.

[0079] For example, an ID for mode-i and an ID for mode-ii are secured. When the recording mode is mode-i, an ID for mode-i is set as tone_map_id in the Tone mapping information inserted into the SEI of the coded data of HDR video. When the recording mode is mode-ii, an ID for mode-ii is set as tone_map_id in the Tone mapping information inserted into the SEI of the coded data of STD video. On the optical disc 11, either the ID for mode-i or the ID for mode-ii is set as tone_map_id.

[0080] The tone_map_model_id on the eighth line indicates the model of the tone map used to convert the coded data.

[0081] In the recording device 1, one piece of Tone mapping information in which a value of 0, 2, or 3 is set as tone_map_model_id, and one piece of Tone mapping information in which a value of 4 is set as tone_map_model_id are generated.

[0082] 8, Tone mapping information in which tone_map_model_id is set to one of 0, 2, and 3 is used as tone mapping definition information for HDR-STD conversion or STD-HDR conversion. Also, information included in Tone mapping information in which tone_map_model_id is set to 4 is used as HDR information.

[0083] Lines 9 to 11 in Figure 7 are descriptions related to tone_map_model_id=0. When tone_map_model_id=0, min_value and max_value are described.

[0084] FIG. 9 is a diagram showing an example of a tone curve indicated by Tone mapping information where tone_map_model_id=0.

[0085] The horizontal axis of Fig. 9 represents coded_data (RGB values ​​before conversion), and the vertical axis represents target_data (RGB values ​​after conversion). When the tone curve of Fig. 9 is used, RGB values ​​equal to or less than coded data D1 are converted to RGB values ​​indicated by min_value, as indicated by hollow arrow #151. RGB values ​​equal to or greater than coded data D2 are converted to RGB values ​​indicated by max_value, as indicated by hollow arrow #152.

[0086] Tone mapping information with tone_map_model_id=0 is used as tone mapping definition information for HDR-STD conversion. When using Tone mapping information with tone_map_model_id=0, luminance (luminance expressed by RGB values) above max_value and below min_value will be lost, but the load of the conversion process will be lighter.

[0087] Lines 15 to 17 in Fig. 7 are descriptions relating to tone_map_model_id=2. When tone_map_model_id=2, start_of_coded_interval[i], which represent a step function and whose number is the same as the number of max_target_data, are described.

[0088] FIG. 10 is a diagram illustrating an example of a step function indicated by Tone mapping information with tone_map_model_id=2.

[0089] When using the step function in Figure 10, for example, coded_data=5 is converted to target_data=3. If start_of_coded_interval[i] is {1,3,4,5,5,5,7,7,···}, the coded_data-target_data conversion table is expressed as {0,1,1,2,3,5,5,···}.

[0090] Tone mapping information for tone_map_model_id=2 is used as tone mapping definition information for STD-HDR conversion or HDR-STD conversion. Because the Tone mapping information for tone_map_model_id=2 contains a large amount of data, it needs to be convolved into a conversion table when it is created, but the load of the conversion process is light.

[0091] Lines 18 to 23 in Figure 7 are descriptions related to tone_map_model_id=3. When tone_map_model_id=3, coded_pivot_value[i] and target_pivot_value[i], the number of which is specified by num_pivots and which represent a broken line function, are described.

[0092] FIG. 11 is a diagram illustrating an example of a broken line function indicated by Tone mapping information with tone_map_model_id=3.

[0093] 11 is used, for example, coded_data=D11 is converted to target_data=D11', and coded_data=D12 is converted to target_data=D12'. Tone mapping information with tone_map_model_id=3 is used as tone mapping definition information for STD-HDR conversion or HDR-STD conversion.

[0094] In this way, Tone mapping information in which a value of 0, 2, or 3 is set as tone_map_model_id is used as tone mapping definition information for STD-HDR conversion or HDR-STD conversion, and is transmitted from the recording device 1 to the playback device 2.

[0095] Lines 24 to 39 in Fig. 7 are descriptions related to tone_map_model_id=4. Of the information related to tone_map_model_id=4, ref_screen_luminance_white, extended_range_white_level, nominal_black_level_code_value, nominal_white_level_code_value, and extended_white_level_code_value are parameters that make up the HDR information.

[0096] FIG. 12 is a diagram illustrating an example of each piece of information included in the HDR information.

[0097] The horizontal axis in Fig. 12 represents each RGB pixel value. When the bit length is 10 bits, each pixel value has a value between 0 and 1023. The vertical axis in Fig. 12 represents brightness (luminance). Curve L11 shows the relationship between pixel value and brightness on a monitor with standard brightness. The dynamic range of a monitor with standard brightness is 0-100%.

[0098] ref_screen_luminance_white is the standard monitor brightness (cd / m 2 ) The extended_range_white_level indicates the maximum brightness value of the extended dynamic range. In the example of FIG. 12, 400 is set as the value of extended_range_white_level.

[0099] The nominal_black_level_code_value indicates the pixel value of black (0% brightness), and the nominal_white_level_code_value indicates the pixel value of white (100% brightness) on a monitor with standard brightness. The extended_white_level_code_value indicates the white pixel value in the extended dynamic range.

[0100] 12, the dynamic range of 0-100% is extended to a dynamic range of 0-400% according to the value of extended_range_white_level, as indicated by the white arrow #161. The pixel value corresponding to a brightness of 400% is specified by extended_white_level_code_value.

[0101] The luminance characteristics of HDR video are those indicated by curve L12, where the values ​​of nominal_black_level_code_value, nominal_white_level_code_value, and extended_white_level_code_value are 0%, 100%, and 400% brightness, respectively.

[0102] In this way, the luminance characteristics of the master HDR video are indicated by the Tone mapping information in which the value 4 is set as tone_map_model_id, and is transmitted from the recording device 1 to the playback device 2.

[0103] <3.About the BD format> Here, the BD-ROM format will be explained.

[0104] [Data management structure] FIG. 13 is a diagram showing an example of the management structure of an AV stream in the BD-ROM format.

[0105] AV streams including HEVC streams are managed using two layers: PlayList and Clip. AV streams may be recorded not only on the optical disc 11 but also in the local storage of the playback device 2.

[0106] A pair of one AV stream and its associated clip information is managed as a single object. The pair of an AV stream and clip information is called a clip.

[0107] An AV stream is expanded on a time axis, and the access point of each Clip is specified in a PlayList mainly by a timestamp. Clip Information is used to find the address in the AV stream where decoding should start.

[0108] A PlayList is a collection of playback sections of an AV stream. One playback section in an AV stream is called a PlayItem. A PlayItem is represented by a pair of IN and OUT points of the playback section on the time axis. As shown in Figure 13, a PlayList is made up of one or more PlayItems.

[0109] The first PlayList from the left in FIG. 13 is made up of two PlayItems, and these two PlayItems refer to the first and second halves of the AV stream contained in the Clip on the left, respectively.

[0110] The second PlayList from the left consists of one PlayItem, which references the entire AV stream contained in the Clip on the right.

[0111] The third PlayList from the left is made up of two PlayItems, and these two PlayItems reference a certain portion of the AV stream contained in the Clip on the left and a certain portion of the AV stream contained in the Clip on the right, respectively.

[0112] For example, if the left PlayItem included in the first PlayList from the left is specified by the disc navigation program as the playback target, the first half of the AV stream included in the left Clip referenced by that PlayItem will be played. In this way, the PlayList is used as playback management information for managing the playback of AV streams.

[0113] A playback path created in a PlayList by a sequence of one or more PlayItems is called a Main Path. A playback path created in a PlayList by a sequence of one or more SubPlayItems, which runs parallel to the Main Path, is called a Sub Path.

[0114] FIG. 14 is a diagram showing the structure of the Main Path and the Sub Path.

[0115] A PlayList has one Main Path and one or more Sub Paths. The PlayList in Fig. 14 has one Main Path and three Sub Paths made up of a sequence of three PlayItems.

[0116] An ID is assigned to each PlayItem that makes up the Main Path, in order from the beginning. IDs are also assigned to the Sub Paths, in order from the beginning: Subpath_id=0, Subpath_id=1, and Subpath_id=2.

[0117] In the example of Fig. 14, the Sub Path with Subpath_id=0 includes one SubPlayItem, the Sub Path with Subpath_id=1 includes two SubPlayItems, and the Sub Path with Subpath_id=2 includes one SubPlayItem.

[0118] An AV stream referenced by one PlayItem includes at least a video stream (main image data). The AV stream may or may not include one or more audio streams that are played at the same time (synchronized) with the video stream included in the AV stream.

[0119] The AV stream may or may not include one or more streams of bitmap subtitle data (PG (Presentation Graphic)) that are played back in synchronization with the video stream included in the AV stream.

[0120] An AV stream may or may not include one or more IG (Interactive Graphic) streams that are played in synchronization with the video stream included in the AV stream file. IG streams are used to display graphics such as buttons that are operated by the user.

[0121] In the AV stream referenced by one PlayItem, a video stream and an audio stream, a PG stream, and an IG stream that are played in synchronization with the video stream are multiplexed.

[0122] Furthermore, one SubPlayItem references a video stream, audio stream, PG stream, etc. that is different from the AV stream referenced by the PlayItem.

[0123] In this way, AV streams including HEVC streams are played back using PlayList and Clip Information. The PlayList and Clip Information containing information related to the playback of AV streams are referred to as Database information as appropriate.

[0124] [Directory Structure] FIG. 15 is a diagram showing an example of the management structure of files recorded on the optical disc 11. As shown in FIG.

[0125] The files recorded on the optical disc 11 are managed hierarchically using a directory structure. One root directory is created on the optical disc 11.

[0126] The BDMV directory is placed under the root directory.

[0127] Stored under the BDMV directory are an Index file named "Index.bdmv" and a MovieObject file named "MovieObject.bdmv".

[0128] Under the BDMV directory, a PLAYLIST directory, a CLIPINF directory, a STREAM directory, etc. are provided.

[0129] The PLAYLIST directory contains PlayList files that describe PlayLists. Each PlayList file has a name that combines a five-digit number with the extension ".mpls." The file name "00000.mpls" is set for one PlayList file shown in FIG.

[0130] The CLIPINF directory stores Clip Information files. Each Clip Information file is given a name that combines a five-digit number with the extension ".clpi." The three Clip Information files in Figure 15 are given the file names "00001.clpi," "00002.clpi," and "00003.clpi," respectively.

[0131] The STREAM directory stores stream files. Each stream file is given a name that combines a five-digit number with the extension ".m2ts." The three stream files in Figure 15 are given the file names "00001.m2ts," "00002.m2ts," and "00003.m2ts," respectively.

[0132] A Clip Information file and a stream file that have the same five-digit number in their file names constitute a single Clip. When playing stream file "00001.m2ts", the Clip Information file "00001.clpi" is used, and when playing stream file "00002.m2ts", the Clip Information file "00002.clpi" is used. As will be described later, Clip Information files used to play AV streams, including HEVC streams, contain information about HDR video processing.

[0133] [Syntax of each file] Here, the main syntax descriptions of each file will be explained.

[0134] FIG. 16 is a diagram showing the syntax of a PlayList file.

[0135] A PlayList file is a file stored in the PLAYLIST directory of FIG. 15 and has the extension ".mpls".

[0136] AppInfoPlayList() stores parameters related to the playback control of the PlayList, such as playback restrictions.

[0137] PlayList() stores parameters related to the Main Path and Sub Path.

[0138] PlayListMark() stores mark information of the PlayList, that is, information about a mark that is a jump destination (jump point) in a user operation or command that instructs a chapter jump or the like.

[0139] FIG. 17 is a diagram showing the syntax of the Clip Information file.

[0140] The Clip Information file is a file stored in the CLIPINF directory in FIG. 15 and has the extension ".clpi."

[0141] ClipInfo() stores information indicating the type of AV stream that constitutes the Clip, information indicating the recording rate of the AV stream, and the like.

[0142] SequenceInfo() includes information indicating the position on the time axis of the source packets that make up the AV stream, information indicating the display time, and the like.

[0143] ProgramInfo() includes the PID of the AV stream that constitutes the Clip, information about the encoding of the AV stream, and so on.

[0144] FIG. 18 is a diagram showing the syntax of ProgramInfo() in FIG.

[0145] The number_of_program_sequences indicates the number of program sequences described in ProgramInfo(). A program sequence is made up of a sequence of source packets that make up a program.

[0146] SPN_program_sequence_start[i] indicates the source packet number at the start of the program sequence.

[0147] StreamCodingInfo includes information about the coding of the AV stream that constitutes the Clip.

[0148] FIG. 19 is a diagram showing the syntax of StreamCodingInfo in FIG.

[0149] The stream_coding_type indicates the coding method of the elementary stream included in the AV stream. For example, in StreamCodingInfo of Clip Information used for playing an HEVC stream, a value indicating that the coding method is HEVC is set as stream_coding_type.

[0150] video_format indicates the video scanning method. In the video_format used for playing an HEVC stream, a value indicating a 4K scanning method such as 2160p (2160 line progressive) is set as stream_coding_type.

[0151] frame_rate indicates the frame rate of the video stream.

[0152] aspect_ratio indicates the aspect ratio of the video.

[0153] cc_flag is a 1-bit flag that indicates whether closed caption data is included in the video stream.

[0154] HDR_flag is a 1-bit flag that indicates whether recording is being performed with HDR video as the master. For example, HDR_flag=1 indicates that recording is being performed with HDR video as the master. HDR_flag=0 indicates that recording is being performed with STD video as the master.

[0155] mode_flag is a 1-bit flag that indicates the recording mode of the HEVC stream. mode_flag is enabled when HDR_flag=1. For example, mode_flag=1 indicates that the recording mode is mode-i. Also, mode_flag=0 indicates that the recording mode is mode-ii.

[0156] In this way, the Clip Information includes a flag indicating whether the HEVC stream included in the AV stream played using that Clip Information is a stream whose master is HDR video, and a flag indicating the recording mode of the HEVC stream.

[0157] By referring to the flag included in the Clip Information, the playback device 2 can determine whether the master video is HDR video, without actually analyzing the HEVC stream.

[0158] <4. Configuration of each device> Here, the configuration of each device will be described.

[0159] [Configuration of Recording Device 1] FIG. 20 is a block diagram showing an example of the configuration of the recording device 1.

[0160] The recording device 1 is made up of a controller 21, an encoding processing unit 22, and a disk drive 23. A master HDR video is input to the encoding processing unit 22.

[0161] The controller 21 is configured by a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), etc. The controller 21 executes a predetermined program and controls the overall operation of the recording device 1.

[0162] A Data Base information generating unit 21A is realized by executing a predetermined program in the controller 21. The Data Base information generating unit 21A generates a PlayList and Clip Information, which are Data Base information, and outputs them to the disc drive 23.

[0163] The encoding processing unit 22 encodes the master HDR video and outputs the HEVC stream obtained by encoding the master HDR video to the disc drive 23.

[0164] The disc drive 23 records the PlayList and Clip Information supplied from the controller 21 and the file storing the HEVC stream supplied from the encoding processing unit 22 on the optical disc 11 according to the directory structure of FIG.

[0165] FIG. 21 is a block diagram showing an example of the configuration of the encoding processing unit 22 in FIG.

[0166] The encoding processing unit 22 is composed of an HDR information generation unit 31, an HEVC encoder 32, an HDR-STD conversion unit 33, a definition information generation unit 34, and an HEVC stream generation unit 35.

[0167] The HDR information generation unit 31 detects the luminance of the input master HDR video, and generates HDR information including each piece of information described with reference to Fig. 12. The HDR information generation unit 31 outputs the generated HDR information to the HEVC stream generation unit 35.

[0168] When the recording mode is mode-i, the HEVC encoder 32 encodes the input master HDR video using HEVC. When the recording mode is mode-ii, the HEVC encoder 32 encodes the STD video supplied from the HDR-STD conversion unit 33 using HEVC. The HEVC encoder 32 outputs the encoded data of the HDR video or the encoded data of the STD video to the HEVC stream generation unit 35.

[0169] The HDR-STD conversion unit 33 converts the input master HDR video into STD video. The conversion by the HDR-STD conversion unit 33 is performed according to conversion parameters input by the author as appropriate. The HDR-STD conversion unit 33 outputs information indicating the correspondence between the input data and the output data, where the RGB signals of the HDR video are the input data and the RGB signals of the STD video are the output data, to the definition information generation unit 34.

[0170] FIG. 22 is a diagram illustrating an example of signal processing by the HDR-STD conversion unit 33.

[0171] As indicated by the tip of arrow #201, the HDR-STD conversion unit 33 converts the YCrCb signals of the input master HDR video into RGB signals, and performs tone mapping on each RGB signal to each RGB signal of the STD video.

[0172] The HDR-STD conversion unit 33 outputs information indicating the correspondence between the RGB signals of the HDR video, which is the input data, and the RGB signals of the STD video, which is the output data, to the definition information generation unit 34. The information output to the definition information generation unit 34 is used to generate tone mapping definition information, as indicated by the tip of arrow #202.

[0173] Furthermore, as indicated by the tip of arrow #203, HDR-STD conversion unit 33 converts the RGB signals of the STD video into YCrCb signals and outputs them.

[0174] FIG. 23 is a diagram illustrating an example of tone mapping.

[0175] The RGB signals of the HDR video are converted into RGB signals of the STD video by compressing high-luminance components and expanding mid- and low-frequency luminance components, for example, as shown in Fig. 23. Information indicating a function F that associates the RGB signals of the HDR video with the RGB signals of the STD video as shown in Fig. 23 is generated by the definition information generation unit 34. Note that the function F shown in Fig. 23 is Tone mapping information of tone_map_model_id=3 that indicates the relationship between coded_data and target_data using a broken line function, as described with reference to Fig. 11.

[0176] Returning to the description of FIG. 21, when the recording mode is mode-ii, the HDR-STD conversion unit 33 outputs the STD video obtained by converting the HDR video to the HEVC encoder 32.

[0177] The definition information generation unit 34 generates tone mapping definition information for HDR-STD conversion based on the information supplied from the HDR-STD conversion unit 33.

[0178] For example, when tone_map_model_id=0 is used, the definition information generation unit 34 generates Tone mapping information including the values ​​of min_value and max_value in FIG. 9 as tone mapping definition information for HDR-STD conversion.

[0179] Furthermore, when tone_map_model_id=2 is used, the definition information generation unit 34 generates Tone mapping information including start_of_coded_interval[i] in FIG. 10 as tone mapping definition information for HDR-STD conversion.

[0180] Furthermore, when tone_map_model_id=3 is used, the definition information generation unit 34 generates Tone mapping information including the number of coded_pivot_value[i] and target_pivot_value[i] specified by num_pivots in Figure 11 as tone mapping definition information for HDR-STD conversion.

[0181] The HEVC stream generation unit 35 sets the same value according to the recording mode to tone_map_id of the Tone mapping information including HDR information supplied from the HDR information generation unit 31 and the Tone mapping information including tone mapping definition information supplied from the definition information generation unit 34. Furthermore, the HEVC stream generation unit 35 inserts the Tone mapping information including HDR information and the Tone mapping information including the tone mapping definition information as SEI into the coded data to generate an HEVC stream. The HEVC stream generation unit 35 outputs the generated HEVC stream to the disc drive 23.

[0182] [Configuration of playback device 2] FIG. 24 is a block diagram showing an example of the configuration of the playback device 2.

[0183] The playback device 2 includes a controller 51 , a disc drive 52 , a memory 53 , a local storage 54 , a network interface 55 , a decoding processing unit 56 , an operation input unit 57 , and an HDMI communication unit 58 .

[0184] The controller 51 is composed of a CPU, a ROM, a RAM, etc. The controller 51 executes a predetermined program and controls the overall operation of the playback device 2.

[0185] The disc drive 52 reads data from the optical disc 11 and outputs the read data to the controller 51, the memory 53, or the decoding processing unit 56. For example, the disc drive 52 outputs Database information read from the optical disc 11 to the controller 51, and outputs the HEVC stream to the decoding processing unit 56.

[0186] The memory 53 stores data necessary for the controller 51 to execute various processes. A register 53A, which is a PSR (Player Status Register), is formed in the memory 53. The register 53A stores various pieces of information that the playback device 2, which is a BD Player, refers to when playing back the optical disc 11.

[0187] The local storage 54 is configured by, for example, an HDD (Hard Disk Drive), and stores streams downloaded from a server.

[0188] The network interface 55 communicates with a server via a network such as the Internet, and supplies data downloaded from the server to the local storage 54 .

[0189] The decoding processing unit 56 decodes the HEVC stream supplied from the disc drive 52 and outputs the HDR video or STD video data to the HDMI communication unit 58. When outputting HDR video, the decoding processing unit 56 outputs HDR information to the HDMI communication unit 58 together with the HDR video data.

[0190] The operation input unit 57 is composed of input devices such as buttons, keys, and a touch panel, as well as a receiving unit that receives signals such as infrared rays transmitted from a predetermined remote commander. The operation input unit 57 detects user operations and supplies a signal indicating the content of the detected operation to the controller 51.

[0191] The HDMI communication unit 58 communicates with the display device 3 via the HDMI cable 4. For example, the HDMI communication unit 58 acquires information about the performance of the monitor of the display device 3 and outputs the information to the controller 51. The HDMI communication unit 58 also outputs the HDR video or STD video data supplied from the decoding processing unit 56 to the display device 3.

[0192] FIG. 25 is a block diagram showing an example of the configuration of the decoding processing unit 56 in FIG.

[0193] The decoding processing unit 56 is composed of a parameter extraction unit 71, an HEVC decoder 72, an HDR-STD conversion unit 73, an STD-HDR conversion unit 74, and an output unit 75. The output unit 75 is composed of an HDR video output unit 75A and an STD video output unit 75B.

[0194] The HEVC stream read by the disc drive 52 is input to the parameter extraction unit 71. For example, the decoding processing unit 56 is supplied from the controller 51 with information indicating the recording mode identified by mode_flag included in the Clip Information and information on the performance of the monitor of the display device 3 identified by information acquired from the display device 3.

[0195] The parameter extraction unit 71 extracts HDR information and tone mapping definition information from the SEI of the HEVC stream. For example, when the recording mode is mode-i and HDR video is to be output to the display device 3, the parameter extraction unit 71 outputs the HDR information to the HDR video output unit 75A. Furthermore, when the recording mode is mode-i and STD video is to be output to the display device 3, the parameter extraction unit 71 outputs tone mapping definition information for HDR-STD conversion to the HDR-STD conversion unit 73.

[0196] On the other hand, when the recording mode is mode-ii and HDR video is output to the display device 3, parameter extraction unit 71 outputs HDR information to HDR video output unit 75A and outputs tone mapping definition information for STD-HDR conversion to STD-HDR conversion unit 74. When the recording mode is mode-ii and STD video is output to the display device 3, the extracted HDR information and tone mapping definition information are not used.

[0197] Furthermore, the parameter extraction unit 71 outputs the coded data included in the HEVC stream to the HEVC decoder 72.

[0198] The HEVC decoder 72 decodes the HEVC encoded data supplied from the parameter extraction unit 71. When the recording mode is mode-i, the HEVC decoder 72 outputs the HDR video obtained by decoding to the HDR-STD conversion unit 73 and the HDR video output unit 75A. When the recording mode is mode-ii, the HEVC decoder 72 outputs the STD video obtained by decoding to the STD-HDR conversion unit 74 and the STD video output unit 75B.

[0199] The HDR-STD conversion unit 73 converts the HDR video supplied from the HEVC decoder 72 into STD video based on the tone mapping definition information for HDR-STD conversion supplied from the parameter extraction unit 71. The HDR-STD conversion unit 73 outputs the STD video obtained by the conversion to the STD video output unit 75B.

[0200] The STD-HDR conversion unit 74 converts the STD video supplied from the HEVC decoder 72 into HDR video based on the tone mapping definition information for STD-HDR conversion supplied from the parameter extraction unit 71. The STD-HDR conversion unit 74 outputs the HDR video obtained by the conversion to the HDR video output unit 75A.

[0201] When outputting HDR video to the display device 3, the HDR video output unit 75A of the output unit 75 outputs the HDR video supplied from the HEVC decoder 72 or the HDR video supplied from the STD-HDR conversion unit 74 together with the HDR information supplied from the parameter extraction unit 71.

[0202] When outputting STD video to the display device 3, the STD video output unit 75B outputs the STD video supplied from the HEVC decoder 72 or the STD video supplied from the HDR-STD conversion unit 73.

[0203] The data output from the HDR video output unit 75A and the STD video output unit 75B is transmitted to the display device 3 by the HDMI communication unit 58.

[0204] [Configuration of display device 3] FIG. 26 is a block diagram showing an example of the configuration of the display device 3.

[0205] The display device 3 includes a controller 101, an HDMI communication unit 102, a signal processing unit 103, and a monitor 104. The controller 101 includes a memory 101A.

[0206] The controller 101 is configured with a CPU, a ROM, a RAM, etc. The controller 101 executes a predetermined program and controls the overall operation of the display device 3.

[0207] For example, the controller 101 stores and manages EDID (Extended display identification data) that indicates the performance of the monitor 104 in the memory 101A. When authenticating the playback device 2, the controller 101 outputs the EDID stored in the memory 101A to the HDMI communication unit 102, which transmits the EDID to the playback device 2. The playback device 2 identifies the performance of the monitor 104 of the display device 3 based on the EDID.

[0208] The HDMI communication unit 102 communicates with the playback device 2 via the HDMI cable 4. The HDMI communication unit 102 receives video data transmitted from the playback device 2 and outputs the data to the signal processing unit 103. The HDMI communication unit 102 also transmits the EDID supplied from the controller 101 to the playback device 2.

[0209] The signal processing unit 103 processes the video data supplied from the HDMI communication unit 102 and displays the video on the monitor 104 .

[0210] <5. Operation of each device> Here, the operation of each device having the above configuration will be explained.

[0211] [RECORDING PROCESS] First, the recording process of the recording device 1 will be described with reference to the flowchart in Fig. 27. The process in Fig. 27 starts when a master HDR video is input to the recording device 1.

[0212] In step S1, the controller 21 of the recording device 1 determines whether the recording mode is mode-i. The recording mode is set by, for example, the author.

[0213] If it is determined in step S1 that the recording mode is mode-i, then in step S2, the encoding processing unit 22 performs encoding processing in mode-i. The HEVC stream generated by the encoding processing in mode-i is supplied to the disc drive 23.

[0214] On the other hand, if it is determined in step S1 that the recording mode is mode-ii, then in step S3, the encoding processing unit 22 performs encoding processing in mode-ii. The HEVC stream generated by the encoding processing in mode-ii is supplied to the disc drive 23.

[0215] In step S4, the Data Base information generating unit 21A performs a Data Base information generating process. The PlayList file and Clip Information file generated by the Data Base information generation process are supplied to the disc drive 23 .

[0216] In step S5, the disc drive 23 records the PlayList file, the Clip Information file, and the stream file storing the HEVC stream onto the optical disc 11. Then, the process ends.

[0217] Next, the encoding process in mode-i performed in step S2 of FIG. 27 will be described with reference to the flowchart of FIG.

[0218] In step S11, the HDR information generation unit 31 of the encoding processing unit 22 detects the luminance of the master HDR video and generates HDR information.

[0219] In step S12, the HEVC encoder 32 performs HEVC encoding on the master HDR video to generate encoded data of the HDR video.

[0220] In step S13, the HDR-STD conversion unit 33 converts the input master HDR video into STD video. Information indicating the correspondence between the input data and the output data, where the RGB signals of the HDR video are the input data and the RGB signals of the STD video are the output data, is supplied to the definition information generation unit 34.

[0221] In step S14, the definition information generation unit 34 generates tone mapping definition information for HDR-STD conversion based on the information supplied from the HDR-STD conversion unit 33.

[0222] In step S15, the HEVC stream generation unit 35 sets an ID for mode-i to the tone_map_id of the Tone mapping information including HDR information generated by the HDR information generation unit 31 and the Tone mapping information including tone mapping definition information generated by the definition information generation unit 34. The HEVC stream generation unit 35 also inserts the Tone mapping information including HDR information and the Tone mapping information including the tone mapping definition information into the coded data to generate an HEVC stream. After that, the process returns to step S2 in Fig. 27, and the subsequent processes are performed.

[0223] Next, the encoding process in mode-ii performed in step S3 of FIG. 27 will be described with reference to the flowchart of FIG.

[0224] In step S21, the HDR information generation unit 31 of the encoding processing unit 22 detects the luminance of the master HDR video and generates HDR information.

[0225] In step S22, the HDR-STD conversion unit 33 converts the input master HDR video into STD video. Information indicating the correspondence between the input data and the output data, where the RGB signals of the HDR video are the input data and the RGB signals of the STD video are the output data, is supplied to the definition information generation unit 34.

[0226] In step S23, the definition information generation unit 34 generates tone mapping definition information for STD-HDR conversion based on the information supplied from the HDR-STD conversion unit 33.

[0227] In step S24, the HEVC encoder 32 performs HEVC encoding on the STD video obtained by converting the master HDR video, and generates encoded data of the STD video.

[0228] In step S25, the HEVC stream generation unit 35 sets an ID for mode-ii to the tone_map_id of the Tone mapping information including HDR information generated by the HDR information generation unit 31 and the Tone mapping information including tone mapping definition information generated by the definition information generation unit 34. The HEVC stream generation unit 35 also inserts the Tone mapping information including HDR information and the Tone mapping information including the tone mapping definition information into the coded data to generate an HEVC stream. After that, the process returns to step S3 in Fig. 27, and the subsequent processes are performed.

[0229] Next, the Database information generation process performed in step S4 of FIG. 27 will be described with reference to the flowchart of FIG.

[0230] In step S31, the Data Base information generation unit 21A of the controller 21 generates a PlayList including the various pieces of information described with reference to Fig. 16. The PlayList generated by the Data Base information generation unit 21A includes information about PlayItems that specify an HEVC stream as a playback section.

[0231] In step S32, the Data Base information generation unit 21A generates Clip Information that includes HDR_flag and mode_flag in StreamCodingInfo of ProgramInfo(). In this example, since the master video is HDR video, the Data Base information generation unit 21A sets the value of HDR_flag to 1, which indicates this.

[0232] Furthermore, when encoding processing is performed in mode-i in step S2 of Fig. 27, the Data Base information generation unit 21A sets the value of mode_flag to 1, which is a value indicating that the recording mode is mode-i. On the other hand, when encoding processing is performed in mode-ii in step S3 of Fig. 27, the Data Base information generation unit 21A sets the value of mode_flag to 0, which is a value indicating that the recording mode is mode-ii. Thereafter, the process returns to step S4 of Fig. 27, and the subsequent processes are performed.

[0233] In the recording device 1, the HEVC stream and Database information generated by the above processing are recorded on the optical disc 11.

[0234] [Reproduction processing] Next, the playback process of the playback device 2 will be described with reference to the flowchart of FIG.

[0235] At a predetermined timing, such as before starting playback of the optical disc 11, the controller 51 of the playback device 2 controls the HDMI communication unit 58 to communicate with the display device 3 and reads the EDID from the memory 101A of the display device 3. The controller 51 stores and manages information indicating the performance of the monitor of the display device 3 in a register 53A.

[0236] In step S41, the controller 51 controls the disc drive 52 to read the PlayList and Clip Information, which are Database information, from the optical disc 11. The controller 51 also identifies the HEVC stream to be played based on the information included in the PlayList, and controls the disc drive 52 to read the AV stream including the identified HEVC stream from the optical disc 11.

[0237] In step S42, the controller 51 references the HDR_flag and mode_flag included in the Clip Information. In this example, the HDR_flag is set to a value indicating that recording has been performed with the master as HDR video. This puts the playback device 2 into a state in which it plays back HDR video or STD video obtained by converting the HDR video.

[0238] In step S43, the controller 51 determines whether the recording mode is mode-i based on the value of mode_flag.

[0239] If it is determined in step S43 that the recording mode is mode-i, the decoding processing unit 56 performs decoding processing in mode-i in step S44.

[0240] On the other hand, if it is determined in step S43 that the recording mode is mode-ii, the decoding processing unit 56 performs decoding processing in mode-ii in step S45.

[0241] After the decoding process is performed in step S44 or step S45, the process ends.

[0242] Here, it is assumed that the determination of whether the recording mode is mode-i is made based on the value of mode_flag, but it may also be made based on tone_map_id of the Tone mapping information inserted in the HEVC stream.

[0243] Next, the decoding process in mode-i performed in step S44 in FIG. 31 will be described with reference to the flowchart in FIG.

[0244] In step S61, the parameter extraction unit 71 of the decoding processing unit 56 extracts HDR information and tone mapping definition information from the SEI of the HEVC stream. The parameter extraction unit 71 outputs the HEVC encoded data included in the HEVC stream to the HEVC decoder 72.

[0245] In step S62, the HEVC decoder 72 decodes the HEVC encoded data and outputs the HDR video obtained by the decoding to the HDR-STD conversion unit 73 and the HDR video output unit 75A.

[0246] In step S63, the controller 51 determines whether the monitor of the display device 3 is an HDR monitor based on the information stored in the register 53A. As described above, the register 53A stores information about the performance of the monitor of the display device 3 based on the HDMI EDID read from the display device 3.

[0247] If it is determined in step S63 that the monitor of the display device 3 is an HDR monitor, in step S64, the HDR video output unit 75A outputs the HDR video supplied from the HEVC decoder 72 together with the HDR information supplied from the parameter extraction unit 71.

[0248] On the other hand, if it is determined in step S63 that the monitor of the display device 3 is not an HDR monitor but an STD monitor, in step S65, the HDR-STD conversion unit 73 converts the HDR video supplied from the HEVC decoder 72 into STD video based on the tone mapping definition information for HDR-STD conversion supplied from the parameter extraction unit 71.

[0249] In step S66, the STD video output unit 75B outputs the STD video obtained by the conversion performed by the HDR-STD conversion unit 73.

[0250] After the HDR video is output in step S64, or after the STD video is output in step S66, the controller 51 determines in step S67 whether or not the playback has ended.

[0251] If it is determined in step S67 that the playback has not ended, the controller 51 returns to step S61 and repeats the above processing. If it is determined in step S67 that the playback has ended, the controller 51 returns to step S44 in Figure 31 and performs the subsequent processing.

[0252] Next, the decoding process in mode-ii performed in step S45 of FIG. 31 will be described with reference to the flowchart of FIG.

[0253] In step S81, the parameter extraction unit 71 of the decoding processing unit 56 extracts HDR information and tone mapping definition information from the SEI of the HEVC stream. The parameter extraction unit 71 outputs the HEVC encoded data included in the HEVC stream to the HEVC decoder 72.

[0254] In step S82, the HEVC decoder 72 decodes the HEVC encoded data and outputs the STD video obtained by the decoding to the STD-HDR conversion unit 74 and the STD video output unit 75B.

[0255] In step S83, the controller 51 determines whether or not the monitor of the display device 3 is an HDR monitor, based on the information stored in the register 53A.

[0256] If it is determined in step S83 that the monitor of the display device 3 is an HDR monitor, in step S84, the STD-HDR conversion unit 74 converts the STD video supplied from the HEVC decoder 72 into HDR video based on the tone mapping definition information for STD-HDR conversion supplied from the parameter extraction unit 71.

[0257] In step S85, the HDR video output unit 75A outputs the HDR video obtained by the conversion performed by the STD-HDR conversion unit 74 together with the HDR information supplied from the parameter extraction unit 71.

[0258] On the other hand, if it is determined in step S83 that the monitor of the display device 3 is a STD monitor, the STD video output unit 75B outputs the STD video supplied from the HEVC decoder 72 in step S86.

[0259] After the HDR video is output in step S85, or after the STD video is output in step S86, the controller 51 determines in step S87 whether or not the playback has ended.

[0260] If it is determined in step S87 that the playback has not ended, the controller 51 returns to step S81 and repeats the above processing. If it is determined in step S87 that the playback has ended, the controller 51 returns to step S45 in Figure 31 and performs the subsequent processing.

[0261] [Display Processing] Next, the display process of the display device 3 will be described with reference to the flowchart of FIG.

[0262] Here, a case will be described in which the monitor 104 of the display device 3 is an HDR monitor. HDR video with HDR information added is transmitted from the playback device 2 to the display device 3 that has an HDR monitor.

[0263] In step S101, the HDMI communication unit 102 of the display device 3 receives the HDR video and HDR information transmitted from the playback device 2.

[0264] In step S102, the controller 101 references the HDR information and determines whether the HDR video transmitted from the playback device 2 can be displayed as is. The HDR information includes information indicating the luminance characteristics of the master HDR video, i.e., the HDR video transmitted from the playback device 2. The determination in step S102 is made by comparing the luminance characteristics of the HDR video specified by the HDR information with the display performance of the monitor 104.

[0265] For example, if the dynamic range of the HDR video specified by the HDR information is 0-400%, and the dynamic range of the monitor 104 is 0-500% (for example, 100% brightness is 100 cd / m 2 This gives 500cd / m 2 ), it is determined that the HDR video can be displayed as is. On the other hand, if the dynamic range of the HDR video specified by the HDR information is 0-400% and the dynamic range of the monitor 104 is 0-300%, it is determined that the HDR video cannot be displayed as is.

[0266] If it is determined in step S102 that the HDR video can be displayed as is, then in step S103, the signal processing unit 103 displays the HDR video image on the monitor 104 according to the luminance specified by the HDR information. For example, if the luminance characteristics shown by curve L12 in FIG. 12 are specified by the HDR information, each pixel value represents a brightness in the range of 0-400% shown by curve L12.

[0267] On the other hand, if it is determined in step S102 that the HDR video cannot be displayed as is, then in step S104, the signal processing unit 103 adjusts the brightness according to the display performance of the monitor 104, and displays the brightness-adjusted HDR video image. For example, if the brightness characteristics shown by curve L12 in Fig. 12 are specified by the HDR information and the dynamic range of the monitor 104 is 0-300%, each pixel value is compressed to represent a brightness in the range of 0-300%.

[0268] After the HDR video image is displayed in step S103 or step S104, in step S105, the controller 101 determines whether or not to end the display, and if it is determined not to end, the processes from step S101 onwards are repeated. If it is determined in step S105 that the display should be ended, the controller 101 ends the process.

[0269] Through the above series of processes, the recording device 1 can record the master HDR video as is onto the optical disc 11, and have the playback device 2 play back the HDR video image, allowing the display device 3 to display the HDR video image.

[0270] Furthermore, the recording device 1 can convert the master HDR video into a STD video and record it on the optical disc 11, and the playback device 2 can restore it to HDR video and display the HDR video image on the display device 3.

[0271] By allowing the brightness characteristics of the master HDR video to be specified using HDR information when playing HDR video, content authors can display HDR video images with the brightness they intended.

[0272] <6. Variations> [Flag storage location] In the above, HDR_flag and mode_flag are stored in Clip Information, but they may also be stored in a PlayList.

[0273] First example of storage location FIG. 35 is a diagram showing an example of the syntax of AppInfoPlayList() included in the PlayList file of FIG.

[0274] As described above, AppInfoPlayList() stores parameters related to the playback control of the PlayList, such as playback restrictions, etc. In the example of Fig. 35, MVC_Base_view_R_flag is followed by HDR_flag and mode_flag.

[0275] In this way, it is also possible to describe HDR_flag and mode_flag in AppInfoPlayList() of the PlayList file.

[0276] Second example of storage location FIG. 36 is a diagram showing the syntax of PlayList() included in the PlayList file of FIG.

[0277] The number_of_PlayItems indicates the number of PlayItems in the PlayList. In the example of Fig. 14, the number of PlayItems is 3. The PlayItem_id value is assigned from 0 in the order in which the PlayItem() appears in the PlayList.

[0278] The number_of_SubPaths indicates the number of Sub Paths in the PlayList. In the example of Fig. 14, the number of Sub Paths is 3. The SubPath_id value is assigned from 0 in the order in which the SubPath() appear in the PlayList.

[0279] As shown in FIG. 36, in the PlayList(), the same number of PlayItem() as the number of PlayItems is described, and the same number of SubPath() as the number of SubPaths is described.

[0280] FIG. 37 is a diagram showing the syntax of PlayItem() in FIG.

[0281] Clip_Information_file_name[0] indicates the name of the Clip Information file of the Clip referenced by the PlayItem.Clip_codec_identifier[0] indicates the codec format of the Clip.

[0282] IN_time indicates the start position of the playback section of the PlayItem, and OUT_time indicates the end position. After OUT_time, UO_mask_table(), PlayItem_random_access_mode, and still_mode are included.

[0283] STN_table() contains information about the AV streams referenced by the PlayItem. If there are SubPaths that are played back in association with the PlayItem, it also contains information about the AV streams referenced by the SubPlayItems that make up the SubPath.

[0284] FIG. 38 is a diagram showing the syntax of STN_table() in FIG.

[0285] "number_of_video_stream_entries" indicates the number of video streams entered (registered) in the STN_table(). "number_of_audio_stream_entries" indicates the number of 1st audio streams entered in the STN_table(). "number_of_audio_stream2_entries" indicates the number of 2nd audio streams entered in the STN_table().

[0286] "number_of_PG_textST_stream_entries" indicates the number of PG_textST streams entered in STN_table(). PG_textST streams are PG (Presentation Graphics) streams that run-length encode bitmap subtitles and text subtitle files (textST). "number_of_IG_stream_entries" indicates the number of IG (Interactive Graphics) streams entered in STN_table().

[0287] STN_table() describes stream_entry() and stream_attributes(), which contain information about each video stream, 1st audio stream, 2nd audio stream, PG_textST stream, and IG stream. stream_entry() contains the PID of the stream, and stream_attributes() contains the attribute information of the stream.

[0288] FIG. 39 is a diagram showing an example of a description related to a video stream, out of the descriptions in stream_attributes() in FIG.

[0289] In the example of stream_attributes() in Figure 39, stream_coding_type, video_format, and frame_rate are described as video stream attribute information, followed by HDR_flag and mode_flag. Note that stream_coding_type indicates the coding method of the video stream, video_format indicates the video format, and frame_rate indicates the video frame rate.

[0290] In this way, it is also possible to write HDR_flag and mode_flag in the STN_table() of the PlayList file.

[0291] It is also possible to describe HDR_flag and mode_flag at a position in the PlayList file other than AppInfoPlayList() and STN_table(). Similarly, it is also possible to describe HDR_flag and mode_flag at a position in the Clip Information file other than StreamCodingInfo described with reference to Fig. 19.

[0292] The positions where HDR_flag and mode_flag are written are arbitrary; for example, one of HDR_flag and mode_flag may be written in the Clip Information file and the other in the PlayList file.

[0293] [PSR] FIG. 40 is a diagram illustrating an example of PSR allocation.

[0294] As described above, the register 53A of the playback device 2 is used as a PSR. In a BD, a PSR number is assigned to each PSR, and the use of each PSR is specified.

[0295] HDR_capability_flag is stored in PSR29, which is a PSR with a PSR number of 29. For example, a value of 1 for HDR_capability_flag in PSR29 indicates that the playback device 2 supports HDR video playback. A value of 0 for HDR_capability_flag in PSR29 indicates that the playback device 2 does not support HDR video playback.

[0296] HDR_capability_flag is referenced by the controller 51 executing the disc navigation program, for example, when an optical disc with 1 set as the value of HDR_flag in Clip Information, that is, an optical disc on which recording has been made with HDR video as the master, is inserted. If 0 is set as the value of HDR_capability_flag, a message is displayed requesting that the playback device 2 connect a display device that supports HDR video processing.

[0297] PSR25, which is a PSR with a PSR number of 25, is used as the PSR that records information indicating the HDR video compatibility of the connected monitor. In this case, information indicating the performance of the monitor of the display device 3, which is indicated by the EDID obtained from the display device 3, is stored in PSR25.

[0298] For example, PSR25 for HDR Display Capability stores information indicating HDR_display_capability_flag and brightness specifications. A value of 1 for HDR_display_capability_flag indicates that the connected monitor can display HDR video. A value of 0 for HDR_display_capability_flag indicates that the connected monitor cannot display HDR video.

[0299] As information indicating the brightness specifications, for example, information indicating up to what percentage of brightness display is possible is stored.

[0300] Instead of using PSR25 for HDR Display Capability, information indicating HDR_display_capability_flag and brightness specifications may be stored in PSR23, which is a PSR for Display Capability.

[0301] <7. Example of adjusting brightness on the playback device> In the above, it has been described that the display device 3 adjusts the brightness by itself when the HDR video transmitted from the playback device 2 cannot be displayed as is, but the brightness of the HDR video may also be adjusted by the playback device 2. The display device 3 receives the HDR video whose brightness has been adjusted by the playback device 2 and displays the HDR video image.

[0302] [Signal processing in mode-i] FIG. 41 is a diagram showing an example of signal processing in mode-i when the brightness of HDR video is adjusted by the playback device 2.

[0303] Of the processes shown in Figure 41, the processes performed by the recording device 1 and the processes related to the output of STD video performed by the playback device 2 are the same as those described with reference to Figure 2. Duplicate descriptions will be omitted where appropriate. It is assumed that the register 53A of the playback device 2 stores the above-mentioned HDR_display_capability_flag and information indicating brightness specifications.

[0304] The playback device 2 reads the HEVC stream from the optical disc 11, and extracts HDR information and tone mapping definition information from the SEI of the HEVC stream, as indicated by the tips of arrows #21 and #22.

[0305] Furthermore, the playback device 2 decodes the HEVC encoded data, as indicated by the tip of arrow #23. If the display device 3 has an HDR monitor but cannot display the HDR video as is, the playback device 2 adjusts the brightness of the HDR video obtained by decoding the encoded data, as shown at the end of arrow #301.

[0306] For example, if the dynamic range of the HDR video indicated by the HDR information is 0-400% and the information indicating the brightness specifications stored in register 53A indicates that the dynamic range of the monitor 104 is 0-300%, the playback device 2 adjusts the brightness. In this case, the brightness of each pixel value is compressed to the range of 0-300%.

[0307] When the brightness of the HDR video is adjusted, the playback device 2 rewrites the HDR information, as indicated by the tip of arrow #302. The rewritten HDR information becomes information that indicates the brightness characteristics of the HDR video after the brightness adjustment.

[0308] As indicated by the arrow #303, the playback device 2 adds HDR information to the brightness-adjusted HDR video data, and outputs the data to the display device 3, as indicated by the arrow #304.

[0309] [Signal processing in mode-II] FIG. 42 is a diagram showing an example of signal processing in mode-ii when the brightness of HDR video is adjusted by the playback device 2.

[0310] Of the processes shown in Fig. 42, the processes performed by the recording device 1 and the processes related to outputting STD video performed by the playback device 2 are the same as the processes explained with reference to Fig. 4. Duplicate explanations will be omitted where appropriate.

[0311] The playback device 2 reads the HEVC stream from the optical disc 11, and extracts HDR information and tone mapping definition information from the SEI of the HEVC stream, as indicated by the tips of arrows #101 and #102.

[0312] Furthermore, as indicated by arrow #103, playback device 2 decodes the HEVC encoded data. If display device 3 has an HDR monitor, playback device 2 converts the STD video obtained by decoding the encoded data into HDR video using tone mapping definition information for STD-HDR conversion extracted from the HEVC stream, as indicated by arrow #105.

[0313] If the display device 3 has an HDR monitor but cannot display the HDR video as is, the playback device 2 adjusts the brightness of the HDR video, as shown at the end of arrow #311, and rewrites the HDR information, as shown at the end of arrow #312.

[0314] As indicated by the arrow #313, the playback device 2 adds HDR information to the brightness-adjusted HDR video data and outputs it to the display device 3, as indicated by the arrow #314.

[0315] In this way, when the brightness of the HDR video is adjusted by the playback device 2, the HDR information is rewritten to represent the brightness characteristics after the adjustment, and is transmitted to the display device 3 together with the HDR video data.

[0316] The display device 3 recognizes that HDR video is being transmitted based on the HDR information, and can display the HDR video image on the monitor 104 according to the brightness specified by the rewritten HDR information.

[0317] [Configuration of playback device 2] FIG. 43 is a block diagram showing an example configuration of the HDR video output unit 75A in FIG.

[0318] The HDR video output unit 75A is composed of a brightness adjustment unit 111 and a rewriting unit 112. The HDR video supplied from the HEVC decoder 72 or the STD-HDR conversion unit 74 is input to the brightness adjustment unit 111. In addition, the HDR information supplied from the parameter extraction unit 71 is input to the rewriting unit 112.

[0319] The brightness adjustment unit 111 adjusts the brightness of the HDR video and outputs the brightness-adjusted HDR video.

[0320] The rewriting unit 112 rewrites the HDR information to represent the adjusted brightness characteristics based on the adjustment result by the brightness adjustment unit 111. The rewritten HDR information is added to the brightness-adjusted HDR video and transmitted to the display device 3.

[0321] [Decryption process of playback device 2] Here, the decoding process in mode-i performed in step S44 in Fig. 31 will be described with reference to the flowchart in Fig. 44. In the process in Fig. 44, the brightness of the HDR video is adjusted as appropriate.

[0322] Of the processes shown in Fig. 44, the processes in steps S151 to S153 and S158 to S160 are the same as the processes in steps S61 to S63 and S65 to S67 in Fig. 32, respectively. Duplicate explanations will be omitted where appropriate.

[0323] In step S151, the parameter extraction unit 71 of the decoding processing unit 56 extracts HDR information and tone mapping definition information from the SEI of the HEVC stream.

[0324] In step S152, the HEVC decoder 72 decodes the HEVC encoded data and outputs the HDR video obtained by the decoding.

[0325] In step S153, the controller 51 determines whether the monitor of the display device 3 is an HDR monitor.

[0326] If it is determined in step S153 that the monitor of the display device 3 is an HDR monitor, then in step S154, the controller 51 determines whether or not the HDR video can be displayed on the monitor 104 of the display device 3 as is.

[0327] If it is determined in step S154 that the HDR video cannot be displayed as is, in step S155, the brightness adjustment unit 111 of the HDR video output unit 75A adjusts the brightness of the HDR video decoded by the HEVC decoder 72 in accordance with the display performance of the monitor 104.

[0328] In step S156, the rewriting unit 112 rewrites the HDR information based on the result of the luminance adjustment.

[0329] In step S157, the HDR video output unit 75A outputs the HDR video after the brightness adjustment together with the rewritten HDR information.

[0330] If it is determined in step S154 that the HDR video can be displayed as is, the processes of steps S155 and S156 are skipped. In this case, in step S157, the HDR video output unit 75A outputs the HDR video decoded by the HEVC decoder 72 together with the HDR information extracted by the parameter extraction unit 71.

[0331] In step S160, it is determined whether or not playback has ended, and if it is determined that playback has ended, the process ends. Thereafter, the process returns to step S44 in Fig. 31, and the subsequent processes are carried out.

[0332] Next, the decoding process in mode-ii performed in step S45 in Fig. 31 will be described with reference to the flowchart in Fig. 45. In the process in Fig. 45, the brightness of the HDR video is adjusted as appropriate.

[0333] Of the processes shown in Fig. 45, the processes in steps S171 to S174, S179, and S180 are the same as the processes in steps S81 to S84, S86, and S87, respectively, in Fig. 33. Duplicate explanations will be omitted where appropriate.

[0334] In step S171, the parameter extraction unit 71 of the decoding processing unit 56 extracts HDR information and tone mapping definition information from the SEI of the HEVC stream.

[0335] In step S172, the HEVC decoder 72 decodes the HEVC encoded data and outputs the STD video obtained by the decoding.

[0336] In step S173, the controller 51 determines whether the monitor of the display device 3 is an HDR monitor.

[0337] If it is determined in step S173 that the monitor of the display device 3 is an HDR monitor, in step S174, the STD-HDR conversion unit 74 converts the decoded STD video into HDR video based on tone mapping definition information for STD-HDR conversion.

[0338] In step S175, the controller 51 determines whether or not the HDR video obtained by converting the STD video can be displayed on the monitor 104 of the display device 3 as is.

[0339] If it is determined in step S175 that the HDR video cannot be displayed as is, in step S176, the brightness adjustment unit 111 of the HDR video output unit 75A adjusts the brightness of the HDR video obtained by converting the STD video in accordance with the display performance of the monitor 104.

[0340] In step S177, the rewriting unit 112 rewrites the HDR information based on the result of the luminance adjustment.

[0341] In step S178, the HDR video output unit 75A outputs the HDR video after the brightness adjustment together with the rewritten HDR information.

[0342] If it is determined in step S175 that the HDR video can be displayed as is, the processes of steps S176 and S177 are skipped. In this case, in step S178, the HDR video output unit 75A outputs the HDR video obtained by converting the STD video together with the HDR information extracted by the parameter extraction unit 71.

[0343] In step S180, it is determined whether or not playback has ended, and if it is determined that playback has ended, the process ends. Thereafter, the process returns to step S45 in Fig. 31, and the subsequent processes are carried out.

[0344] [Display processing of display device 3] Next, the display processing of the display device 3 will be described with reference to the flowchart of FIG.

[0345] The processing in Fig. 46 is performed after the processing in Fig. 44 or 45 by the playback device 2. To the display device 3 equipped with an HDR monitor, the playback device 2 transmits, together with HDR information, the original HDR video without brightness adjustment or the HDR video after brightness adjustment.

[0346] In step S191, the HDMI communication unit 102 of the display device 3 receives the HDR video and HDR information transmitted from the playback device 2.

[0347] In step S192, the signal processing unit 103 displays the HDR video image on the monitor 104 according to the luminance specified by the HDR information.

[0348] In step S193, the controller 101 determines whether or not to end the display, and if it is determined not to end, the processes from step S191 onwards are repeated. If it is determined in step S193 that the display should be ended, the controller 101 ends the process.

[0349] In this way, when brightness adjustment is performed by the playback device 2, the display device 3 does not need to determine whether or not it can directly display the HDR video transmitted from the playback device 2. Furthermore, the display device 3 does not need to adjust the brightness of the HDR video by itself.

[0350] When it is necessary to adjust the brightness of HDR video, the user of the playback device 2 may be able to set whether the brightness adjustment is to be performed on the playback device 2 side or on the display device 3 side.

[0351] Alternatively, the display device 3 may notify the playback device 2 whether the brightness adjustment will be performed on the playback device 2 side or the display device 3 side, and the processing performed in the playback device 2 may be switched in response to the notification. For example, if the display device 3 has a function for adjusting the brightness of HDR video, the display device 3 may be notified that the brightness adjustment will be performed on its side, and if the display device 3 does not have the function for adjusting the brightness of HDR video, the playback device 2 may be notified that the brightness adjustment will be performed on its side.

[0352] When the display device 3 notifies the playback device 2 that brightness adjustment will be performed on its side, the playback device 2 performs the decoding process shown in Fig. 44 or 45. When the display device 3 notifies the playback device 2 that brightness adjustment will be performed on its side, the playback device 2 performs the decoding process shown in Fig. 32 or 33.

[0353] The parameters used for the brightness adjustment performed by the playback device 2 may differ from those used by the display device 3. In this case, it is considered more desirable from the standpoint of image quality to have the brightness adjustment performed by the display device 3, which has a monitor 104 and can perform adjustments that are more suited to the characteristics of the monitor 104.

[0354] By allowing the display device 3 to select whether brightness adjustment is performed on the playback device 2 side or the display device 3 side, it becomes possible to display HDR video with high image quality. The selection of whether brightness adjustment is performed on the playback device 2 side or the display device 3 side can be made based on a user operation. For example, when a user operates a remote controller or a button provided on the main body of the display device 3 to instruct display of a menu screen, the controller 101 of the display device 3 controls the signal processing unit 103 to display a menu screen including setting items related to HDR video on the monitor 104. When a setting item related to HDR video is selected, a screen used to select whether brightness adjustment is performed on the playback device 2 side or the display device 3 side is displayed, and the user can select one of them. The display device 3 notifies the playback device 2 of whether brightness adjustment of HDR video is performed on the playback device 2 side or the display device 3 side by transmitting information indicating the user's selection to the playback device 2 via the HDMI cable 4.

[0355] Notification of whether the brightness of HDR video is to be adjusted on the playback device 2 side or on the display device 3 side can be realized using HDMI EDID.

[0356] <8. Example of application to HDMI> [HDR EDID and HDR InfoFrame] FIG. 47 is a diagram showing an example of recognition based on information transmitted and received via HDMI.

[0357] As shown on the left side of Fig. 47, the playback device 2, which is a BD player that supports 4K resolution HDR video processing, reads out EDID stored in memory 101A of the display device 3. The memory 101A of the display device 3 stores multiple EDIDs, including an EDID that indicates the performance of the monitor 104 of the display device 3.

[0358] If the EDID read from the display device 3 includes an HDR EDID, the playback device 2 recognizes that the display device 3 has an HDR monitor and is capable of outputting HDR video to the display device 3. The HDR EDID includes information about the output of HDR video. The HDR EDID is used to notify the playback device 2 or the display device 3 whether the brightness of the HDR video will be adjusted.

[0359] As shown on the right side of Fig. 47, the playback device 2 adds an HDR InfoFrame to the data of each frame of HDR video that is output to the display device 3. In the HDMI standard, an InfoFrame is added to each frame of video. The video InfoFrame contains information about the video specifications, such as information indicating whether the video data is RGB data or YCbCr data, and information indicating the aspect ratio.

[0360] An HDR InfoFrame is an InfoFrame that contains information about HDR video specifications. HDR information indicating the brightness characteristics of HDR video is transmitted using the HDR InfoFrame. The playback device 2 outputs HDR video data with the HDR InfoFrame added to the display device 3.

[0361] When an HDR InfoFrame is added to the video data transmitted from the playback device 2, the display device 3 recognizes that the video data transmitted from the playback device 2 is HDR video data. The display device 3 then displays the HDR video image on the HDR monitor.

[0362] FIG. 48 is a diagram showing another example of recognition based on information transmitted and received via HDMI.

[0363] 48, if the EDID read from the display device 3 does not include an HDR EDID, the playback device 2 recognizes that the display device 3 is a device that does not have an HDR monitor. In this case, the playback device 2 outputs only STD video data to the display device 3. No HDR InfoFrame is added to the STD video data output by the playback device 2.

[0364] On the other hand, as shown on the right side of Fig. 48, if an HDR InfoFrame is not added to the video data transmitted from the playback device 2, the display device 3 recognizes that the video data transmitted from the playback device 2 is STD video data. The display device 3 then displays the STD video image on the STD monitor.

[0365] In this way, it is possible to use HDMI InfoFrame to transmit HDR information from the playback device 2 to the display device 3. In addition, it is possible to use HDMI EDID to notify the playback device 2 from the display device 3 whether the brightness of the HDR video will be adjusted on the playback device 2 side or the display device 3 side.

[0366] FIG. 49 is a diagram illustrating an example of HDR EDID.

[0367] The HDR EDID includes information indicating the monitor's maximum brightness, information indicating the maximum expansion level, and a raw / cooked flag-1, which indicates whether the HDR video is output raw or whether the HDR video brightness is adjusted if necessary before output.

[0368] A value of 1 in raw / cooked flag-1 indicates that the display device 3 is requesting that the HDR video be output without processing, that is, that the HDR video be output without brightness adjustment performed on the playback device 2 side. When the value of raw / cooked flag-1 is 1, the playback device 2 outputs the HDR video without adjusting the brightness, even if the dynamic range of the HDR video exceeds the display performance of the monitor 104.

[0369] For example, if the display device 3 has a function for adjusting the brightness of HDR video, it sets 1 as the value of raw / cooked flag-1.

[0370] Furthermore, a value of 0 for raw / cooked flag-1 indicates that the display device 3 is requesting that the playback device 2 adjust the luminance of the HDR video, if necessary, before outputting it. If the value of raw / cooked flag-1 is 0 and the dynamic range of the HDR video exceeds the display performance of the monitor 104, the playback device 2 adjusts the luminance of the HDR video in accordance with the display performance of the monitor 104, and outputs the adjusted HDR video.

[0371] For example, if the display device 3 does not have a function for adjusting the brightness of HDR video, it sets 0 as the value of the raw / cooked flag-1.

[0372] The decoding process of Fig. 32 or 33, in which brightness adjustment is not performed on the playback device 2 side but on the display device 3 side, corresponds to the process when the value of raw / cooked flag-1 is 1. Also, the decoding process of Fig. 44 or 45, in which brightness adjustment is performed on the playback device 2 side, corresponds to the process when the value of raw / cooked flag-1 is 0.

[0373] Hereinafter, the unprocessed HDR video output by the playback device 2 will be referred to as "raw output," and the output of HDR video after the playback device 2 adjusts the brightness of the HDR video as necessary will be referred to as "cooked output."

[0374] FIG. 50 is a diagram illustrating an example of an HDR InfoFrame.

[0375] The HDR InfoFrame includes HDR information parameters ref_screen_luminance_white, extended_range_white_level, nominal_black_level_code_value, nominal_white_level_code_value, extended_white_level_code_value, and raw / cooked flag-2.

[0376] The HDR InfoFrame also includes the raw / cooked flag-2, which indicates whether the output HDR video is raw HDR video without brightness adjustment, or HDR video with brightness adjustment.

[0377] A value of 1 for raw / cooked flag-2 indicates that the output HDR video is unprocessed HDR video for which no brightness adjustment has been performed by the playback device 2. For example, if the value of raw / cooked flag-1 included in the HDR EDID is 1, the playback device 2 adds an HDR InfoFrame with the value of raw / cooked flag-2 set to 1 to the HDR video data and outputs the HDR video.

[0378] Furthermore, a value of 0 for raw / cooked flag-2 indicates that the HDR video to be output is HDR video after brightness adjustment. For example, if the value of raw / cooked flag-1 included in the HDR EDID is 0 and the dynamic range of the HDR video exceeds the display performance of the monitor 104, the playback device 2 adjusts the brightness and sets the value of raw / cooked flag-2 to 0. The playback device 2 adds an HDR InfoFrame with the value of raw / cooked flag-2 set to 0 to data of the HDR video after brightness adjustment, and outputs the HDR InfoFrame.

[0379] 32 or 33, where brightness adjustment is not performed on the playback device 2 side, raw / cooked flag-2 of the HDR InfoFrame is set to a value of 1. Furthermore, in the decoding process of FIG. 44 or 45, where brightness adjustment is sometimes performed on the playback device 2 side, raw / cooked flag-2 of the HDR InfoFrame may be set to a value of 0.

[0380] [Processing of playback device 2 and display device 3] Here, the processing of the playback device 2 and the display device 3 using HDR EDID and HDR InfoFrame will be described.

[0381] First, the process of the display device 3 for setting HDR EDID will be described with reference to the flowchart in FIG.

[0382] In step S211, the controller 101 of the display device 3 sets the value of raw / cooked flag-1 to 1 or 0, and stores in the memory 101A an HDR EDID consisting of information indicating the maximum brightness of the monitor, information indicating the maximum expansion level, and raw / cooked flag-1.

[0383] In step S212, in response to the request from the playback device 2, the HDMI communication unit 102 reads out a plurality of EDIDs including the HDR EDID from the memory 101A and transmits them to the playback device 2.

[0384] Next, the playback process of the playback device 2 will be described with reference to the flowchart in FIG. The process of FIG. 52 is started after the process of FIG. 51 is performed in the display device 3, for example.

[0385] In step S221, the controller 51 controls the disc drive 52 to read the PlayList and Clip Information, which are Database information, from the optical disc 11. The controller 51 also identifies the HEVC stream to be played based on the information included in the PlayList, and controls the disc drive 52 to read the AV stream including the identified HEVC stream from the optical disc 11.

[0386] In step S222, the controller 51 refers to HDR_flag and mode_flag included in the Clip Information. In this example, a value indicating that recording is being performed with the master as HDR video is set in HDR_flag.

[0387] In step S223, the controller 51 controls the HDMI communication unit 58 to read the EDID from the display device 3. The HDMI communication unit 58 requests the HDMI communication unit 102 of the playback device 2 to read the EDID, and the HDMI communication unit 58 acquires the multiple EDIDs transmitted in response to the request.

[0388] In step S224, the controller 51 determines whether the EDID read from the display device 3 includes an HDR EDID.

[0389] If it is determined in step S224 that HDR EDID is included, the controller 51 recognizes that HDR video can be output to the display device 3, and in step S225, stores information indicating the display capabilities of the monitor 104 in the register 53A. For example, the controller 51 stores information indicating the maximum luminance and maximum expansion level of the monitor, which are included in the HDR EDID, in the PSR 25 as information indicating the luminance specifications of the monitor. The controller 51 also sets a value in the HDR_display_capability_flag of the PSR 25 indicating that the monitor 104 is capable of displaying HDR video.

[0390] In step S226, the controller 51 determines, based on the raw / cooked flag-1 included in the HDR EDID, whether or not raw output is requested by the display device 3. In the example described above, the controller 51 determines that raw output is requested if the value of raw / cooked flag-1 is 1, and determines that cooked output is requested if the value is 0.

[0391] If it is determined in step S226 that raw output is requested, in step S227, the controller 51 performs HDR raw output processing, which is processing for outputting HDR video in raw form.

[0392] If it is determined in step S226 that raw output is not requested, in step S228, the controller 51 performs HDR cooked output processing, which is processing for outputting cooked HDR video.

[0393] On the other hand, if it is determined in step S224 that HDR EDID is not included, in step S229, the controller 51 performs STD output processing, which is processing for outputting STD video. The output destination of the STD video in the STD output processing is a display device that does not have an HDR monitor, different from the display device 3.

[0394] After the video data is output in steps S227, S228, and S229, the process ends.

[0395] Next, the HDR raw output process performed in step S227 in FIG. 52 will be described with reference to the flowchart in FIG.

[0396] In step S241, the parameter extraction unit 71 of the decoding processing unit 56 extracts HDR information and tone mapping definition information from the SEI of the HEVC stream. The parameter extraction unit 71 outputs the HEVC encoded data included in the HEVC stream to the HEVC decoder 72.

[0397] In step S242, the HEVC decoder 72 decodes the HEVC encoded data. If the recording mode is mode-i, the HDR video data obtained by decoding the encoded data is supplied to the HDR video output unit 75A. If the recording mode is mode-ii, the STD video data obtained by decoding the encoded data is supplied to the STD-HDR conversion unit 74.

[0398] In step S243, the controller 51 determines whether the recording mode is mode-i based on the value of mode_flag.

[0399] If it is determined in step S243 that the recording mode is mode-ii, then in step S244, the STD-HDR conversion unit 74 converts the STD video supplied from the HEVC decoder 72 into HDR video based on the tone mapping definition information for STD-HDR conversion supplied from the parameter extraction unit 71. If it is determined in step S243 that the recording mode is mode-i, the processing of step S244 is skipped.

[0400] In step S245, the HDR video output unit 75A sets the value of raw / cooked flag-2 to 1, which indicates that the HDR video is unprocessed HDR video that has not undergone brightness adjustment. Furthermore, the HDR video output unit 75A generates an HDR InfoFrame that includes each parameter of the HDR information extracted by the parameter extraction unit 71 and the raw / cooked flag-2.

[0401] In step S246, the HDR video output unit 75A adds the HDR InfoFrame to the data of each frame of the HDR video and outputs it to the display device 3.

[0402] In step S247, the controller 51 determines whether or not the playback has ended, and if it determines that the playback has not ended, the process returns to step S241 and repeats the above processing. If it determines in step S247 that the playback has ended, the process returns to step S227 in Figure 52 and the subsequent processing is performed.

[0403] Next, the HDR·cooked output process performed in step S228 in FIG. 52 will be described with reference to the flowchart in FIG.

[0404] In step S261, the parameter extraction unit 71 of the decoding processing unit 56 extracts HDR information and tone mapping definition information from the SEI of the HEVC stream. The parameter extraction unit 71 outputs the HEVC encoded data included in the HEVC stream to the HEVC decoder 72.

[0405] In step S262, the HEVC decoder 72 decodes the HEVC encoded data. If the recording mode is mode-i, the HDR video data obtained by decoding the encoded data is supplied to the HDR video output unit 75A. If the recording mode is mode-ii, the STD video data obtained by decoding the encoded data is supplied to the STD-HDR conversion unit 74.

[0406] In step S263, the controller 51 determines whether the recording mode is mode-i based on the value of mode_flag.

[0407] If it is determined in step S263 that the recording mode is mode-ii, then in step S264, the STD-HDR conversion unit 74 converts the STD video supplied from the HEVC decoder 72 into HDR video based on the tone mapping definition information for STD-HDR conversion supplied from the parameter extraction unit 71. If it is determined in step S263 that the recording mode is mode-i, the processing of step S264 is skipped.

[0408] In step S265, the controller 51 compares the luminance characteristics of the HDR video indicated by the HDR information with the performance of the monitor 104 indicated by the information included in the HDR EDID, and determines whether the HDR video can be displayed as is on the monitor 104.

[0409] If it is determined in step S265 that the HDR video cannot be displayed as is, in step S266, the brightness adjustment unit 111 of the HDR video output unit 75A adjusts the brightness of the HDR video according to the display performance of the monitor 104.

[0410] In step S267, the rewriting unit 112 rewrites the HDR information based on the result of the brightness adjustment. If it is determined in step S265 that the HDR video can be displayed as is, the processes of steps S266 and S267 are skipped.

[0411] In step S268, the HDR video output unit 75A sets a predetermined value to the raw / cooked flag-2, and generates an HDR InfoFrame including each parameter of the HDR information.

[0412] For example, if the brightness of the HDR video has not been adjusted, the HDR video output unit 75A sets the value of raw / cooked flag-2 to 1, indicating this, and generates an HDR InfoFrame that includes raw / cooked flag-2 and each parameter of the HDR information extracted by the parameter extraction unit 71.

[0413] On the other hand, if the brightness of the HDR video is adjusted, the HDR video output unit 75A sets the value of raw / cooked flag-2 to 0, indicating this, and generates an HDR InfoFrame that includes raw / cooked flag-2 and each parameter of the rewritten HDR information.

[0414] In step S269, the HDR video output unit 75A adds the HDR InfoFrame to the data of each frame of the HDR video and outputs it to the display device 3.

[0415] In step S270, the controller 51 determines whether or not the playback has ended, and if it determines that the playback has not ended, the process returns to step S261 and repeats the above processing. If it determines in step S270 that the playback has ended, the process returns to step S228 in Figure 52 and the subsequent processing is performed.

[0416] Next, the STD output process performed in step S229 in FIG. 52 will be described with reference to the flowchart in FIG.

[0417] As described above, the processing in FIG. 55 is processing for outputting video data to a display device that is different from the display device 3 and does not have an HDR monitor.

[0418] In step S281, the parameter extraction unit 71 of the decoding processing unit 56 extracts HDR information and tone mapping definition information from the SEI of the HEVC stream. The parameter extraction unit 71 outputs the HEVC encoded data included in the HEVC stream to the HEVC decoder 72.

[0419] In step S282, the HEVC decoder 72 decodes the HEVC encoded data. If the recording mode is mode-i, the HDR video data obtained by decoding the encoded data is supplied to the HDR-STD conversion unit 73. If the recording mode is mode-ii, the STD video data obtained by decoding the encoded data is supplied to the STD video output unit 75B.

[0420] In step S283, the controller 51 determines whether the recording mode is mode-i based on the value of mode_flag.

[0421] If it is determined in step S283 that the recording mode is mode-i, then in step S284, the HDR-STD conversion unit 73 converts the HDR video supplied from the HEVC decoder 72 into STD video based on the tone mapping definition information for HDR-STD conversion supplied from the parameter extraction unit 71. If it is determined in step S283 that the recording mode is mode-ii, the processing of step S284 is skipped.

[0422] In step S285, the STD video output unit 75B outputs the STD video supplied from the HEVC decoder 72 or the STD video data supplied from the HDR-STD conversion unit 73.

[0423] In step S286, the controller 51 determines whether or not the playback has ended, and if it determines that the playback has not ended, the process returns to step S281 and repeats the above processing. If it determines in step S286 that the playback has ended, the process returns to step S229 in Figure 52 and the subsequent processing is performed.

[0424] Next, the display processing of the display device 3 will be described with reference to the flowchart of FIG.

[0425] An HDR InfoFrame is added to the video data that the playback device 2 transmits to the display device 3 that has an HDR monitor. Based on the HDR InfoFrame, the controller 101 of the display device 3 recognizes that the video data transmitted from the playback device 2 is HDR video data.

[0426] In step S301, the HDMI communication unit 102 of the display device 3 receives the HDR video data transmitted from the playback device 2. An HDR InfoFrame is added to the data of each frame of the HDR video.

[0427] In step S302, the controller 101 determines whether or not the HDR video data is raw output data, based on the raw / cooked flag-2 included in the HDR InfoFrame.

[0428] If the value of raw / cooked flag-2 is set to 1, the controller 101 determines that the HDR video data is raw output data. Also, if the value of raw / cooked flag-2 is set to 0, the controller 101 determines that the HDR video data is cooked output data.

[0429] If it is determined in step S302 that the HDR video data is raw output data, in step S303, the signal processing unit 103 refers to the HDR information included in the HDR InfoFrame. If the dynamic range of the HDR video exceeds the display performance of the monitor 104, the signal processing unit 103 adjusts the brightness of the HDR video as appropriate and causes the monitor 104 to display the HDR video image after the brightness adjustment.

[0430] On the other hand, if it is determined in step S302 that the HDR video data is cooked output data, in step S304, the signal processing unit 103 displays the HDR video image on the monitor 104 in accordance with the HDR information included in the HDR InfoFrame.

[0431] After the HDR video image is displayed in step S303 or step S304, in step S305, the controller 101 determines whether to end the display of the HDR video, and if it determines not to end it, it repeats the processing from step S301 onwards. If it determines in step S305 that the display should end, the controller 101 ends the processing.

[0432] Through the above series of processes, the playback device 2 can use HDMI InfoFrame to transmit HDR information to the display device 3. In addition, the display device 3 can use HDMI EDID to request whether the brightness of the HDR video should be adjusted on the playback device 2 side or the display device 3 side.

[0433] <9. Other variations> When HDR video data is transmitted from the playback device 2 to the display device 3, HDR information is added before transmission, but the data may be transmitted without adding HDR information.

[0434] Furthermore, although the above description has been given mainly on the case where the playback device 2 is a BD player, the above-described functions of the playback device 2 may be incorporated into a mobile terminal. In this case, the mobile terminal will function as the playback device 2.

[0435] Furthermore, although the content played by the playback device 2 has been described as being content recorded on removable media, the above-described technology can also be applied to playing content distributed over a network. In this case, the playback device 2 receives content transmitted from a server connected over a network such as the Internet, plays the content, and outputs HDR video to the display device 3.

[0436] [Example of computer configuration] The above-described series of processes can be executed by hardware or software. When the series of processes is executed by software, the program constituting the software is installed from a program recording medium into a computer incorporated in dedicated hardware or a general-purpose personal computer.

[0437] FIG. 57 is a block diagram showing an example of the hardware configuration of a computer that executes the above-described series of processes using a program.

[0438] The CPU 501 , ROM 502 , and RAM 503 are connected to one another via a bus 504 .

[0439] An input / output interface 505 is also connected to the bus 504. An input unit 506 including a keyboard, a mouse, etc., and an output unit 507 including a display, a speaker, etc. are connected to the input / output interface 505. In addition, a storage unit 508 including a hard disk, a nonvolatile memory, etc., a communication unit 509 including a network interface, etc., and a drive 510 that drives removable media 511 are also connected to the input / output interface 505.

[0440] In the computer configured as above, the CPU 501 loads a program stored in the storage unit 508 into the RAM 503 via the input / output interface 505 and the bus 504 and executes the program, thereby performing the above-described series of processes.

[0441] The program executed by the CPU 501 is installed in the storage unit 508 by being recorded on a removable medium 511, or provided via a wired or wireless transmission medium such as a local area network, the Internet, or digital broadcasting.

[0442] The program executed by the computer may be a program that processes in chronological order according to the order described in this specification, or may be a program that processes in parallel or at the required timing, such as when called.

[0443] The embodiments of the present technology are not limited to the above-described embodiments, and various modifications are possible without departing from the spirit of the present technology.

[0444] In this specification, a system refers to a collection of multiple components (devices, modules (components), etc.), regardless of whether all the components are contained in the same housing. Therefore, multiple devices housed in separate housings and connected via a network, and a single device housed in a single housing with multiple modules, are both systems.

[0445] [Configuration combination example] The present technology can also be configured as follows.

[0446] (1) a reading unit that reads out, from a recording medium on which coded data of an extended video, which is a video having a second luminance range wider than a first luminance range, luminance characteristic information indicating luminance characteristics of the extended video, and luminance conversion definition information used when performing luminance conversion from the extended video to a standard video, which is a video having the first luminance range, the coded data, the luminance characteristic information, and the luminance conversion definition information are recorded; a decoding unit that decodes the encoded data; a conversion unit that converts the extended video obtained by decoding the encoded data into the standard video based on the luminance conversion definition information; an output unit that outputs the extended video data and the luminance characteristic information to a display device that can display the extended video, and outputs the standard video data to a display device that cannot display the extended video; A playback device comprising: (2) The luminance characteristic information and the luminance conversion definition information are inserted into a stream including the encoded data as auxiliary information of the encoded data, and are recorded on the recording medium. The playback device according to (1) above. (3) The coded data is HEVC coded data, and the brightness characteristic information and the brightness conversion definition information are SEI of an HEVC stream. The playback device according to (2) above. (4) the luminance conversion definition information is first Tone mapping information in which one of 0, 2, and 3 is set as a value of tone_map_model_id, The luminance characteristic information is second Tone mapping information in which the value of tone_map_model_id is set to 4. The playback device according to (3) above. (5) The tone_map_model_id of the first Tone mapping information and the second Tone mapping information is set to the same value that indicates the recording mode of the recording medium. The playback device according to (4) above. (6) information relating to playback of the encoded data, including a flag indicating whether or not recording has been performed using the extended video as a master, is further recorded on the recording medium; The decoding unit decodes the encoded data when the flag indicates that recording has been performed using the extended video as a master. The playback device according to any one of (1) to (5). (7) the recording medium is a Blu-ray disc, The flag is included in a Clip Information file as information related to the playback. The playback device according to (6) above. (8) the recording medium is a Blu-ray disc, The flag is included in a PlayList file as information related to the playback. The playback device according to (6) above. (9) reading out, from a recording medium on which coded data of an extended video, which is a video having a second luminance range wider than a first luminance range, luminance characteristic information indicating luminance characteristics of the extended video, and luminance conversion definition information used when performing luminance conversion from the extended video to a standard video, which is a video having the first luminance range, the coded data, the luminance characteristic information, and the luminance conversion definition information are recorded; Decoding the encoded data; converting the extended video obtained by decoding the encoded data into the standard video based on the luminance conversion definition information; outputting the extended video data and the brightness characteristic information to a display device capable of displaying the extended video; The standard video data is output to a display device that cannot display the extended video. Playback method including steps. (10) Encoded data of an extended video, which is a video having a second luminance range wider than the first luminance range; and luminance characteristic information indicating a luminance characteristic of the extended video. brightness conversion definition information used when performing brightness conversion from the extended video to a standard video which is a video of the first brightness range; A recording medium having the following recorded thereon: In the playback device for playing back the recording medium, reading the encoded data, the luminance characteristic information, and the luminance conversion definition information from the recording medium; Decoding the encoded data; converting the extended video obtained by decoding the encoded data into the standard video based on the luminance conversion definition information; outputting the extended video data and the brightness characteristic information to a display device capable of displaying the extended video; The standard video data is output to a display device that cannot display the extended video. The recording medium on which the processing takes place. (11) a reading unit that reads out, from a recording medium on which coded data of a standard video, which is a video having a first luminance range obtained by performing luminance conversion on an extended video, which is a video having a second luminance range wider than a first luminance range, luminance characteristic information indicating luminance characteristics of the extended video, and luminance conversion definition information used when performing luminance conversion from the standard video to the extended video, the coded data, the luminance characteristic information, and the luminance conversion definition information are recorded; a decoding unit that decodes the encoded data; a conversion unit that converts the standard video obtained by decoding the encoded data into the extended video based on the luminance conversion definition information; an output unit that outputs the extended video data and the luminance characteristic information to a display device that can display the extended video, and outputs the standard video data to a display device that cannot display the extended video; A playback device comprising: (12) The luminance characteristic information and the luminance conversion definition information are inserted into a stream including the encoded data as auxiliary information of the encoded data, and are recorded on the recording medium. The playback device according to (11) above. (13) The coded data is HEVC coded data, and the brightness characteristic information and the brightness conversion definition information are SEI of an HEVC stream. The playback device according to (12) above. (14) the luminance conversion definition information is first Tone mapping information in which one of 0, 2, and 3 is set as a value of tone_map_model_id, The luminance characteristic information is second Tone mapping information in which the value of tone_map_model_id is set to 4. The playback device according to (13) above. (15) The tone_map_model_id of the first Tone mapping information and the second Tone mapping information is set to the same value that indicates the recording mode of the recording medium. The playback device according to (14) above. (16) information relating to playback of the encoded data, including a flag indicating whether or not recording has been performed using the extended video as a master, is further recorded on the recording medium; The decoding unit decodes the encoded data when the flag indicates that recording has been performed using the extended video as a master. The playback device according to any one of (11) to (15). (17) the recording medium is a Blu-ray disc, The flag is included in a Clip Information file as information related to the playback. The playback device according to (16) above. (18) the recording medium is a Blu-ray disc, The flag is included in a PlayList file as information related to the playback. The playback device according to (16) above. (19) a recording medium storing encoded data of a standard video, which is a video having a first luminance range, obtained by performing luminance conversion on an extended video, which is a video having a second luminance range wider than a first luminance range; luminance characteristic information indicating luminance characteristics of the extended video; and luminance conversion definition information used when performing luminance conversion from the standard video to the extended video; Decoding the encoded data; converting the standard video obtained by decoding the encoded data into the extended video based on the luminance conversion definition information; outputting the extended video data and the brightness characteristic information to a display device capable of displaying the extended video; The standard video data is output to a display device that cannot display the extended video. Playback method including steps. (20) Encoded data of a standard video, which is a video of a first luminance range, obtained by performing luminance conversion on an extended video, which is a video of a second luminance range wider than the first luminance range; brightness characteristic information indicating a brightness characteristic of the extended video; luminance conversion definition information used when converting luminance from the standard video to the extended video; A recording medium on which the following is recorded: In the playback device for playing back the recording medium, reading the encoded data, the luminance characteristic information, and the luminance conversion definition information from the recording medium; Decoding the encoded data; converting the standard video obtained by decoding the encoded data into the extended video based on the luminance conversion definition information; outputting the extended video data and the brightness characteristic information to a display device capable of displaying the extended video; The standard video data is output to a display device that cannot display the extended video. The recording medium on which the processing takes place. [Explanation of symbols]

[0447] 1 Recording device, 2 Playback device, 3 Display device, 11 Optical disc, 21 Controller, 21A Data Base information generation unit, 22 Encoding processing unit, 23 Disk drive, 31 HDR information generation unit, 32 HEVC encoder, 33 HDR-STD conversion unit, 34 Definition information generation unit, 35 HEVC stream generation unit, 51 Controller, 52 Disk drive, 53 Memory, 56 Decoding processing unit, 58 HDMI communication unit, 71 Parameter extraction unit, 72 HEVC decoder, 73 HDR-STD conversion unit, 74 STD-HDR conversion unit, 75 Output unit

Claims

[Claim 1] a memory containing an EDID containing video resolution information; an interface that outputs luminance performance information of the display unit to a playback device and receives video data and luminance characteristic information from the playback device; a circuit for controlling the display of an image based on the received video data and the received brightness characteristic information; a user interface that displays a menu screen and selects whether or not to adjust the brightness of the image on the display unit; Equipped with the video data is processed by the playback device based on the brightness performance information; the received video data is processed video data; The luminance characteristic information represents a luminance characteristic. Display device.

Images