Processing Equipment

Abstract

To make it possible to transmit HDR video data after applying appropriate photoelectric conversion according to an image content to the HDR video data.SOLUTION: Input video data having a level range of 0% to 100%*N (N is a number greater than 1) is subjected to photoelectric conversion to obtain transmission video data. A container including a video stream obtained by encoding the transmission video data is transmitted. Information on electro-optic conversion characteristics for each predetermined unit of the transmission video data is inserted into a video stream layer and / or a container layer. For example, the predetermined unit is a scene unit or a program unit.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present technology relates to processing devices. [Background technology]

[0002] Conventionally, gamma correction is known, which corrects the gamma characteristics of a monitor by inputting data having the inverse characteristics of the monitor. For example, Non-Patent Document 1 describes transmitting a video stream generated by encoding transmission video data obtained by applying photoelectric conversion to HDR (High Dynamic Range) video data having a level of 0 to 100%*N (N is greater than 1). [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] High Efficiency Video Coding (HEVC) text specification draft 10 (for FDIS & Last Call) Summary of the Invention [Problem to be solved by the invention]

[0004] If the range of compatibility with conventional photoelectric conversion characteristics is widened, the range in which the effect of HDR is exerted will be narrowed. On the other hand, if the range in which the effect of HDR is exerted is widened in the photoelectric conversion characteristics applied to HDR video data, the range in which compatibility with conventional photoelectric conversion characteristics is narrowed. In this way, it is difficult for a single photoelectric conversion characteristic to simultaneously satisfy both compatibility with conventional characteristics and the rich expressive performance unique to HDR. On the other hand, generally, the requirements for the gradation of HDR images differ from image to image.

[0005] The purpose of this technology is to enable the transmission of HDR video data after performing appropriate photoelectric conversion according to the image content. [Means for solving the problem]

[0006] The concept of this technology is as follows: a processing unit that performs photoelectric conversion on input video data having a level range of 0% to 100%*N (N is a number greater than 1) to obtain transmission video data; a transmitting unit for transmitting a container including a video stream obtained by encoding the transmission video data; An information inserting unit is provided for inserting information on electrical-optical conversion characteristics of each predetermined unit of the transmitted video data into the layer of the video stream and / or the layer of the container. Located in the transmitting device.

[0007] In this technology, a processing unit performs photoelectric conversion on input video data having a level range of 0% to 100%*N (N is a number greater than 1) to obtain transmission video data. A transmitting unit transmits a container including a video stream obtained by encoding the transmission video data. For example, the container may be a transport stream (MPEG-2 TS) adopted in the digital broadcasting standard. Also, for example, the container may be MP4 used for Internet distribution or a container in another format.

[0008] The information inserting unit inserts information on electrical-optical conversion characteristics for each predetermined unit of the transmission video data into the video stream layer and / or the container layer. For example, the predetermined unit may be a scene unit or a program unit. For example, the electrical-optical conversion characteristic information may be type information for specifying a type of the electrical-optical conversion characteristic. For example, the electrical-optical conversion characteristic information may be a parameter for determining a curve of the electrical-optical conversion characteristic.

[0009] In this way, in the present technology, information on the electro-optical conversion characteristics for each predetermined unit of transmitted video data is inserted into the video stream layer and / or the container layer. Therefore, it becomes possible to selectively apply appropriate photoelectric conversion characteristics according to the image contents to the HDR video data for each predetermined unit, perform photoelectric conversion, and transmit the HDR video data.

[0010] Another concept of the present technology is a receiving unit for receiving a container in a predetermined format including a video stream obtained by encoding transmitted video data; The transmission video data is obtained by photoelectrically converting input video data having a level range of 0% to 100%*N (N is a number greater than 1); information on electrical-optical conversion characteristics for each predetermined unit of the transmitted video data is inserted into a layer of the video stream and / or a layer of the container; The video stream is further provided with a processing unit that processes the video stream included in the container received by the receiving unit. in the receiving device.

[0011] In this technology, a receiving unit receives a container in a predetermined format including a video stream obtained by encoding transmission video data. The transmission video data is obtained by performing photoelectric conversion on input video data having a level range of 0% to 100%*N (N is a number greater than 1). In addition, information on the photoelectric conversion characteristics of the transmission video data for each predetermined unit is inserted in a layer of the video stream and / or a layer of the container. The processing unit processes the video stream included in the container received by the receiving unit.

[0012] For example, the processing unit may include a decoding unit that decodes a video stream to obtain transmission video data, and an electro-optical conversion unit that performs electro-optical conversion on the transmission video data obtained by the decoding unit based on information on electro-optical conversion characteristics for each predetermined unit of the transmission video data to obtain output video data. This makes it possible to reproduce the HDR video data before being photoelectrically converted on the transmitting side, thereby enabling good display of HDR images.

[0013] In this case, for example, the electro-optical conversion characteristic information may be type information for specifying a type of electro-optical conversion characteristic, and the electro-optical conversion unit may perform electro-optical conversion on the transmission video data based on a curve of the electro-optical conversion characteristic of the type specified by the type information. Also, in this case, for example, the electro-optical conversion characteristic information may be parameters for determining the curve of the electro-optical conversion characteristic, and the electro-optical conversion unit may perform electro-optical conversion on the transmission video data based on the curve of the electro-optical conversion characteristic determined by the parameters.

[0014] In this case, for example, the curve of the electro-optical conversion characteristic used in the electro-optical conversion unit may be determined based on the maximum displayable level information together with the parameters, and the maximum level of the output video data may be limited to the maximum displayable level information. This allows the HDR image to be displayed satisfactorily on the display unit (display) without causing whiteout or the like.

[0015] The processing unit may also include a decoding unit that decodes a video stream included in the container to obtain transmission video data, and a transmitting unit that associates the transmission video data obtained by the decoding unit with electro-optical conversion characteristic information for each predetermined unit of the transmission video data and transmits the transmission video data to an external device. In this way, the external device can perform electro-optical conversion on the transmission video data based on the information on the electro-optical conversion characteristic for each predetermined unit, thereby reproducing the HDR video data before electro-optical conversion on the transmitting side, and enabling good display of HDR images.

[0016] In this case, for example, the transmitting unit may transmit the transmission video data to an external device via a differential signal on a predetermined number of channels, and transmit the information on the electrical-optical conversion characteristics to the external device by inserting the information on the electrical-optical conversion characteristics into a blanking period of the transmission video data.

[0017] Another concept of the present technology is a receiving unit for receiving, from an external device, transmission video data and information on electro-optical conversion characteristics of the transmission video data for each predetermined unit, the information being associated with the transmission video data; an electro-optical conversion section for performing electro-optical conversion on the transmission video data received by the receiving section based on information on the electro-optical conversion characteristic for each predetermined unit, to obtain output video data; It is on the display device.

[0018] In this technology, the receiving unit receives the transmission video data and information on the electro-optical conversion characteristics of the transmission video data for each predetermined unit, which is associated with the transmission video data, from an external device. The electro-optical conversion unit performs electro-optical conversion on the transmission video data received by the receiving unit based on the information on the electro-optical conversion characteristics for each predetermined unit, thereby obtaining output video data. This makes it possible to reproduce the HDR video data before electro-optical conversion, and to display HDR images in a good condition.

[0019] In this case, for example, the electro-optical conversion characteristic information may be type information for specifying a type of electro-optical conversion characteristic, and the electro-optical conversion unit may perform electro-optical conversion on the transmission video data based on the electro-optical conversion characteristic curve of the type specified by the type information. Also, in this case, for example, the electro-optical conversion characteristic information may be parameters for determining the electro-optical conversion characteristic curve, and the electro-optical conversion unit may perform electro-optical conversion on the transmission video data based on the electro-optical conversion characteristic curve determined by the parameters.

[0020] In this case, for example, the curve of the electro-optical conversion characteristic used in the electro-optical conversion unit may be determined based on the maximum displayable level information together with the parameters, and the maximum level of the output video data may be limited to the maximum displayable level information. This allows the HDR image to be displayed satisfactorily on the display unit (display) without causing whiteout or the like.

[0021] Another concept of the present technology is a first transmitting unit for transmitting a container including a video stream composed of encoded data of transmission video data obtained by performing photoelectric conversion on input video data having a level range of 0% to 100%*N (N is a number greater than 1); a second transmitting unit for transmitting a metafile having information for acquiring the video stream at a receiving side; Information on electrical-optical conversion characteristics for each predetermined unit of the transmitted video data is inserted into the video stream and / or the metafile. Located in the transmitting device.

[0022] In this technology, a first transmitting unit transmits a container including a video stream consisting of encoded data of transmission video data obtained by performing photoelectric conversion on input video data having a level range of 0% to 100%*N (N is a number greater than 1). Also, a second transmitting unit transmits a metafile having information for acquiring the video stream on the receiving side. Then, information on the electrical-optical conversion characteristics for each predetermined unit of the transmission video data is inserted into the video stream and / or the metafile.

[0023] In this way, in the present technology, information on the electro-optical conversion characteristics for each predetermined unit of transmitted video data is inserted into the video stream and / or metafile. Therefore, it becomes possible to selectively apply appropriate photoelectric conversion characteristics according to the image contents to the HDR video data for each predetermined unit, perform photoelectric conversion, and transmit the data.

[0024] Another concept of the present technology is a transmitter for transmitting a container including a video stream including coded data of transmission video data obtained by photoelectrically converting input video data having a level range of 0% to 100%*N (N is a number greater than 1); Information on electrical-optical conversion characteristics for each predetermined unit of the transmitted video data is inserted into a layer of the video stream and / or a layer of the container. Located in the transmitting device. Effect of the Invention

[0025] According to the present technology, it is possible to perform appropriate photoelectric conversion according to image content on HDR video data and transmit the data. Note that the effects described in this specification are merely examples and are not limiting, and additional effects may also be provided. [Brief description of the drawings]

[0026] [Figure 1] FIG. 1 is a block diagram showing a configuration example of a transmission / reception system. [Diagram 2] FIG. 2 is a block diagram showing a configuration example of a transmission device. [Diagram 3] FIG. 4 is a diagram showing an example of photoelectric conversion characteristics. [Figure 4] FIG. 2 is a diagram showing the first access unit of a GOP when the encoding method is HEVC. [Diagram 5] FIG. 13 is a diagram showing an example of the structure of an HDR EOTF Information SEI message. [Figure 6] A figure showing an example of the structure of "HDR_EOTF information_data()". [Figure 7] FIG. 13 is a diagram showing the main contents of an example structure of “HDR_EOTF information_data()”. [Figure 8] FIG. 13 is a diagram illustrating an example of the structure of an HDR descriptor. [Figure 9] FIG. 2 is a diagram illustrating an example of the configuration of a transport stream. [Figure 10]FIG. 2 is a block diagram showing an example of the configuration of a set-top box. [Figure 11] FIG. 13 is a diagram illustrating an example of the packet structure of an HDMI Vendor Specific InfoFrame. [Figure 12] FIG. 13 is a diagram illustrating an example of the packet structure of an HDMI Vendor Specific InfoFrame. [Figure 13] FIG. 1 is a diagram illustrating a configuration example of a display device. [Figure 14] FIG. 13 is a diagram showing an example of an electro-optical conversion characteristic. [Figure 15] FIG. 13 is a diagram showing an example of an electro-optical conversion characteristic. [Figure 16] FIG. 13 is a block diagram showing another example of the configuration of the transmission / reception system. [Figure 17] FIG. 2 is a block diagram showing a configuration example of a receiving device. [Figure 18] FIG. 1 is a block diagram showing an example of the configuration of an MPEG-DASH-based transmission / reception system. [Figure 19] FIG. 13 is a diagram for explaining a newly defined schema. [Figure 20] 13 is a diagram showing an example of description of an MPD file including electro-optical conversion characteristic information. FIG. [Figure 21] A figure showing an example of the structure of a Fragmented MP4 stream. [Figure 22] FIG. 13 is a block diagram showing another example configuration of an MPEG-DASH-based transmission / reception system. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] Hereinafter, modes for carrying out the invention (hereinafter, referred to as "embodiments") will be described. The description will be made in the following order. 1. Embodiment 2. Variations

[0028] <1. Preferred embodiment> [Transmitting and receiving system configuration] 1 shows a configuration example of a transmission / reception system 10 according to an embodiment. The transmission / reception system 10 includes a transmission device 100, a set-top box (STB) 200, and a display device (monitor) 300. The set-top box 200 and the display device 300 are connected via a High Definition Multimedia Interface (HDMI) cable 400.

[0029] The transmitting device 100 generates an MPEG2 transport stream TS as a container and transmits this transport stream TS on broadcast waves or network packets. This transport stream TS has a video stream obtained by encoding the transmission video data.

[0030] This transmission video data is obtained by selectively applying appropriate photoelectric conversion characteristics according to the image contents to the HDR video data, which is the input video data, for each predetermined unit, and performing photoelectric conversion. In this case, for example, the input video data has a level range of 0% to N% (N>100), whereas the transmission video data has a level range of 0% to 100%. Here, the value of "%" indicates a relative value, for example, with 100cd / m2 being 100%. The predetermined unit is a scene unit or a program unit, etc.

[0031] The transmitting device 100 inserts information on the electrical-optical conversion characteristics for each predetermined unit of the transmission video data into the layer of the video stream and / or the layer of the transport stream (container). The electrical-optical conversion characteristics are generally the inverse characteristics of the optical-electrical conversion characteristics, but do not necessarily have to be completely inverse characteristics. Here, the information on the electrical-optical conversion characteristics is, for example, type information for specifying the type of the electrical-optical conversion characteristics, or parameters for obtaining the curve of the electrical-optical conversion characteristics.

[0032] The set-top box 200 receives a transport stream TS transmitted by broadcast waves or network packets from the transmitting device 100. This transport stream TS has a video stream obtained by encoding the transmitted video data. The set-top box 200 performs a decoding process on the video stream to obtain the transmitted video data.

[0033] The set-top box 200 also acquires information on electrical-optical conversion characteristics for each predetermined unit of the transmission video data inserted in the layer of the video stream and / or the layer of the transport stream (container). The set-top box 200 associates the transmission video data with the electrical-optical conversion characteristic information and transmits them to the display device 300.

[0034] In this case, the set-top box 200 sends the transmission video data and the electrical-optical conversion characteristic information to the display device 300 through the HDMI cable 400. That is, the set-top box 200 transmits the transmission video data on a TMDS channel, and transmits the electrical-optical conversion characteristic information by, for example, inserting it into a blanking period of the transmission video data.

[0035] The display device 300 receives the transmission video data and the electro-optical conversion characteristic information sent from the set-top box 200 through the HDMI cable 400. The display device 300 performs electro-optical conversion on the transmission video data based on the electro-optical conversion characteristic information for each predetermined unit to obtain output video data. Then, the display device 300 displays an HDR image based on the output video data on a display unit (display).

[0036] In this case, when the electro-optical conversion characteristic information is type information, the display device 300 performs electro-optical conversion on the transmission video data based on the electro-optical conversion characteristic curve of the type specified by the type information. Also, in this case, when the electro-optical conversion characteristic information is a parameter for determining the electro-optical conversion characteristic curve, the display device 300 performs electro-optical conversion on the transmission video data based on the electro-optical conversion characteristic curve determined by the parameter. In this case, for example, it is also possible to limit the maximum level of the output video data to the maximum level information that can be displayed by determining it based on maximum level information that can be displayed together with the parameter.

[0037] "Transmitter Configuration" 2 shows an example of the configuration of the transmitting device 100. This transmitting device 100 has a control unit 101, a camera 102, a photoelectric conversion unit 103, a video encoder 104, a system encoder 105, and a transmitting unit 106. The control unit 101 is configured with a CPU (Central Processing Unit), and controls the operation of each unit of the transmitting device 100 based on a control program stored in a storage device (not shown).

[0038] The camera 102 captures an image of a subject and outputs video data of a high dynamic range (HDR) image (HDR video data). This video data has a level range of 0 to 100%*N, for example, 0 to 400% or 0 to 800%. Here, a level of 100% corresponds to a white luminance value of 100 cd / m2.

[0039] The photoelectric conversion unit 103 selectively applies electro-optical conversion characteristics according to the image contents to the HDR video data obtained from the camera 102 for each predetermined unit, for example, for each scene or each program, and performs photoelectric conversion to generate transmission video data. The selection of the photoelectric conversion characteristics to be applied here is performed automatically by analyzing the image contents, or manually by a user operation. In this case, for example, when the input video data of the photoelectric conversion unit 103 is represented by 12 bits or more, the transmission video data after photoelectric conversion is represented by 10 bits or less.

[0040] FIG. 3 shows an example of photoelectric conversion characteristics. The "HDR:Type 1" curve is compatible with legacy gamma characteristics from 0 to S1. The "HDR:Type 2" curve is compatible with legacy gamma characteristics from 0 to S2. Furthermore, the "HDR:Type 3" curve is compatible with legacy gamma characteristics from 0 to S3. Note that the photoelectric conversion characteristics that can be selected by the photoelectric conversion unit 103 are not limited to these three.

[0041] 2, the video encoder 104 obtains encoded video data by encoding the transmission video data generated by the photoelectric conversion unit 103 in a format such as MPEG4-AVC, MPEG2video, or HEVC (high efficiency video coding). The video encoder 104 also generates a video stream (video elementary stream) including the encoded video data using a stream formatter (not shown) provided downstream.

[0042] At this time, the video encoder 104 inserts information on electro-optical conversion characteristics for each predetermined unit of the transmission video data into the layer of the video stream. This electro-optical conversion characteristic information generally indicates an inverse characteristic of the electro-optical conversion characteristic applied by the above-mentioned photoelectric conversion unit 103, but does not necessarily have to be a completely inverse characteristic. This electro-optical conversion characteristic information is, for example, type information for specifying the type of electro-optical conversion characteristic, or a parameter for obtaining a curve of the electro-optical conversion characteristic. The video encoder 104 inserts this electro-optical conversion characteristic information, for example, in units of GOP (Group Of Picture), which is a display access unit including a predicted image.

[0043] The system encoder 105 generates a transport stream TS including the video stream generated by the video encoder 104. Then, the transmission unit 106 transmits this transport stream TS to the setup box 200 via broadcast waves or net packets.

[0044] At this time, the system encoder 105 inserts information on electrical-optical conversion characteristics for each predetermined unit of transmitted video data into the transport stream (container) layer, similar to the above-mentioned insertion into the video stream layer. In this case, the system encoder 105 inserts this electrical-optical conversion characteristic information, for example, under a video elementary loop (Video ES loop) of a program map table (PMT) included in the transport stream TS.

[0045] The operation of the transmission device 100 shown in Fig. 2 will be briefly described. Video data of an HDR image captured by the camera 102 (HDR video data) is supplied to the photoelectric conversion unit 103. In this photoelectric conversion unit 103, photoelectric conversion is performed by selectively applying electro-optical conversion characteristics according to the image contents to this HDR video data for each predetermined unit, for example, for each scene or each program, and transmission video data is generated.

[0046] The transmission video data thus generated by the photoelectric conversion unit 103 is supplied to the video encoder 104. In this video encoder 104, the transmission video data is subjected to encoding, for example, HEVC, and a video stream (video elementary stream) including the encoded video data is generated. At this time, in the video encoder 104, information on the electrical-optical conversion characteristics of each predetermined unit of the transmission video data is inserted into a layer of the video stream.

[0047] The video stream generated by the video encoder 104 is supplied to the system encoder 105. This system encoder 105 generates an MPEG2 transport stream TS including the video stream. At this time, the system encoder 105 inserts information on the electrical-optical conversion characteristics for each predetermined unit of transmitted video data into the transport stream (container) layer, similar to the insertion into the video stream layer described above. This transport stream TS is loaded onto broadcast waves or net packets by the transmitter 106 and transmitted to the set-top box 200.

[0048] [Electro-optical conversion characteristics information, TS configuration] As described above, the electro-optical conversion characteristic information is inserted into the layer of the video stream. For example, when the encoding method is HEVC, this electro-optical conversion characteristic information is inserted into the “SEIs” part of the access unit (AU) as an HDR EOTF information SEI message (HDR_EOTF_information SEI message).

[0049] Figure 4 shows the first access unit of a GOP (Group Of Pictures) when the encoding method is HEVC. In the case of the HEVC encoding method, a group of SEI messages for decoding, "Prefix_SEIs", is placed before the slices in which pixel data is encoded, and a group of SEI messages for display, "Suffix_SEIs", is placed after these slices. The HDR EOTF information SEI message is placed as the SEI message group, "Suffix_SEIs".

[0050] FIG. 5(a) shows an example of the structure (Syntax) of the "HDR_EOTF_information SEI message". "uuid_iso_iec_11578" has a UUID value specified in "ISO / IEC 11578:1996 AnnexA." "HDR_EOTF information()" is inserted into the "user_data_payload_byte" field. FIG. 5(b) shows an example of the structure (Syntax) of "HDR_EOTF information()", into which "HDR_EOTF_information_data()" is inserted as electro-optical conversion characteristic information. "userdata_id" is an identifier of the electro-optical conversion characteristic information, specified as 16 unsigned bits. The 8-bit field of "HDR_EOTF_information_length" indicates the byte size of the "HDR_EOTF_information_data()" following this field.

[0051] FIG. 6 shows an example structure (Syntax) of the electro-optical conversion characteristic information "HDR_EOTF information_data()". FIG. 7 shows the contents (Semantics) of each piece of information in the example structure shown in FIG. 6. The 16-bit field of "uncompressed_peak_level" indicates the percentage value of the maximum level of the source image data (HDR video data) (relative value when 100cd / m2 is 100%). "eotf_flag" is 1-bit flag information, and indicates whether the electro-optical conversion characteristic information is type information or not. "1" indicates that it is type information for specifying the type of electro-optical conversion characteristic. "0" indicates that it is a parameter for obtaining the electro-optical conversion characteristic curve.

[0052] When "eotf_flag = 1", the 8-bit field "eotf_type" is present. This field indicates the type of electro-optical conversion characteristics. On the other hand, when "eotf_flag = 0", the following information is present: The 16-bit field "compressed_peak_level" indicates the percentage value (relative to 100cd / m2) of the maximum level of the coded image data (transmitted video data). The 8-bit field "number_of_mapping_periods" indicates the number of chained level mapping curves.

[0053] The 16-bit field "compressed_mapping_level" indicates the change in the level mapping curve on the level compression axis as a percentage value with "compressed_peak_level" set to 100%. The 16-bit field "uncompressed_mapping_level" indicates the change in the level mapping curve on the level uncompressed axis as a percentage value with "uncompressed_peak_level" set to 100%.

[0054] As described above, the electro-optical conversion characteristic information is inserted into the layer of the transport stream. In this embodiment, for example, an HDR descriptor, which is a descriptor including the electro-optical conversion characteristic information, is inserted under a PMT (Program Map Table).

[0055] Figure 8 shows an example of the structure (Syntax) of this HDR descriptor. Although a detailed explanation is omitted, this HDR descriptor contains information similar to the electro-optical conversion characteristic information "HDR_EOTF information_data()" in the HDR EOTF information SEI message described above. The 8-bit field "HDR descriptor_tag" indicates the descriptor type, and in this case indicates that it is an HDR descriptor. The 8-bit field "HDR descriptor_length" indicates the length (size) of the descriptor, and indicates the number of subsequent bytes as the length of the descriptor.

[0056] Figure 9 shows an example of the structure of a transport stream TS. The transport stream TS includes a video elementary stream PES packet "PID1:video PES1." The above-mentioned HDR EOTF information SEI message (HDR_EOTF_information SEI message) is inserted into this video elementary stream.

[0057] The transport stream TS also includes a PMT (Program Map Table) as PSI (Program Specific Information). The PSI is information indicating which program each elementary stream included in the transport stream belongs to. The transport stream TS also includes an EIT (Event Information Table) as SI (Serviced Information) for managing events (programs).

[0058] The PMT contains an elementary loop that contains information related to each elementary stream. In this configuration example, there is a video elementary loop (Video ES loop). This video elementary loop contains information such as the stream type and packet identifier (PID) corresponding to the above-mentioned video elementary stream, as well as a descriptor that describes information related to that video elementary stream. The above-mentioned HDR descriptor is placed under the video elementary loop (Video ES loop) of this PMT.

[0059] "Configuring the Setup Box" 10 shows an example of the configuration of a set-top box 200. This set-top box 200 has a control unit 201, a receiving unit 202, a system decoder 203, a video decoder 204, an HDMI (High-Definition Multimedia Interface) transmitting unit 205, and an HDMI terminal 206. Note that "HDMI" is a registered trademark.

[0060] The control unit 201 is configured to include a CPU (Central Processing Unit), and controls the operation of each unit of the set-top box 200 based on a control program stored in a storage device (not shown).

[0061] The receiving unit 202 receives the transport stream TS transmitted from the transmitting device 100 via broadcast waves or network packets. The system decoder 203 extracts a video stream (elementary stream) from this transport stream TS. The system decoder 203 also extracts various pieces of information inserted in the layers of the transport stream TS as described above, and sends them to the control unit 201. This information also includes an HDR descriptor having the above-mentioned electrical-optical conversion characteristic information.

[0062] The video decoder 204 performs a decoding process on the video stream extracted by the system decoder 203 to obtain transmission video data (baseband video data). The video decoder 204 also extracts an SEI message inserted in the video stream and sends it to the control unit 201. This SEI message also includes an HDR EOTF information SEI message having the above-mentioned electro-optical conversion characteristic information.

[0063] The HDMI transmission unit 205 transmits the transmission video data acquired by the video decoder 204 through HDMI-compliant communication to an HDMI sink device, in this embodiment, the display device 300, via the HDMI terminal 206. In addition, the HDMI transmission unit 205 is provided with electro-optical conversion characteristic information for each predetermined unit (for example, scene unit, program unit, etc.) of the transmission video data from the control unit 201, and transmits this electro-optical conversion characteristic information to the display device 300 in association with the transmission video data.

[0064] In this case, for example, the electro-optical conversion characteristic information is inserted into a blanking period of the transmission video data, and is transmitted in association with the transmission video data. Note that the method of transmitting the electro-optical conversion characteristic information is not limited to inserting it into a blanking period as described above. For example, it is also possible to transmit the information using a CEC line or HEC (HDMI Ethernet channel).

[0065] When transmitting the electro-optical conversion characteristic information by inserting it into the blanking period of the transmitted video data, one possible method is to use an information packet placed in the blanking period of the image data, such as an HDMI Vendor Specific InfoFrame (VS_Info).

[0066] Fig. 11 shows an example of the packet structure of an HDMI Vendor Specific InfoFrame. This HDMI Vendor Specific InfoFrame is defined in CEA-861-D, so a detailed description will be omitted. The packet structure example in Fig. 11 shows a case where the electrical-optical conversion characteristic information is type information that specifies the type of electrical-optical conversion characteristic.

[0067] The 0th bit of the 5th byte (PB5) contains flag information "Hdr_INFOFLAG" indicating whether or not electrical-optical conversion characteristic information has been inserted. If electrical-optical conversion characteristic information has been inserted, "Hdr_INFOFLAG = 1" is set. Additionally, the 3rd bit of the 7th byte (PB7) contains flag information "Eotf_flag" indicating whether or not the electrical-optical conversion characteristic information is type information. In the example of FIG. 11, "Eotf_flag = 1" is set, indicating that the electrical-optical conversion characteristic information is type information.

[0068] In this way, when the electro-optical conversion characteristic information is type information, 16-bit information of "uncompressed_peak_level" is placed in the 8th byte (PB8) and the 9th byte (PB9). In this case, the upper 8 bits are placed in the 8th byte, and the lower 8 bits are placed in the 9th byte. In addition, 8-bit information of "eotf_type" is placed in the 10th byte (PB10).

[0069] Figure 12 also shows an example of the packet structure of an HDMI Vendor Specific InfoFrame. The packet structure example in Figure 12 shows a case where the electrical-optical conversion characteristic information is a parameter for determining the electrical-optical conversion characteristic curve. In this example, "Eotf_flag = 0" indicates that the electrical-optical conversion characteristic information is a parameter.

[0070] In this way, when the electro-optical conversion characteristic information is a parameter, 16-bit information of "uncompressed_peak_level" is placed in the 8th byte (PB8) and the 9th byte (PB9). In this case, the upper 8 bits are placed in the 8th byte, and the lower 8 bits are placed in the 9th byte. Also, 16-bit information of "compressed_peak_level" is placed in the 10th byte (PB10) and the 11th byte (PB11). In this case, the upper 8 bits are placed in the 10th byte, and the lower 8 bits are placed in the 11th byte.

[0071] In addition, 8-bit information of "number_of_mapping_periods" is placed in the 12th byte (PB12). In addition, 16-bit information of "compressed_mapping_level" is placed in the 13th byte (PB13) and the 14th byte (PB14). In this case, the upper 8 bits are placed in the 13th byte, and the lower 8 bits are placed in the 14th byte. In addition, 16-bit information of "uncompressed_mapping_level" is placed in the 15th byte (PB15) and the 16th byte (PB16). In this case, the upper 8 bits are placed in the 15th byte, and the lower 8 bits are placed in the 16th byte. Below, the same information as the 13th byte to the 16th byte is repeatedly placed for the number of "number_of_mapping_periods".

[0072] [Display device configuration] 13 shows an example of the configuration of a display device 300. This display device 300 has a control unit 301, an HDMI terminal 302, an HDMI receiving unit 303, an electro-optical conversion unit 304, and a display unit 305. The control unit 301 is configured with a CPU (Central Processing Unit), and controls the operation of each unit of the display device 300 based on a control program stored in a storage device (not shown).

[0073] The HDMI receiving unit 303 receives transmission video data and electrical-optical conversion characteristic information for each predetermined unit (for example, scene unit, program unit, etc.) of the transmission video data from an HDMI source device, in this embodiment, the set-top box 200, by HDMI-compliant communication via the HDMI terminal 302. The HDMI receiving unit 303 sends the received electrical-optical conversion characteristic information to the control unit 301.

[0074] The electro-optical converter 304 performs electro-optical conversion on the transmission video data received by the HDMI receiver 303 based on information on electro-optical conversion characteristics for each predetermined unit provided by the controller 301 to obtain output video data. The display unit 305 displays an HDR image based on this output video data. In this case, for example, when the input video data of the electro-optical converter 304 is represented by 10 bits or less, the output video data of the electro-optical converter 304 is represented by 12 bits or more.

[0075] When the electro-optical conversion characteristic information is type information, the electro-optical conversion unit 304 performs electro-optical conversion on the transmission video data based on the electro-optical conversion characteristic curve of the type specified by the type information. FIG. 14 shows an example of electro-optical conversion characteristics. The curve of "HDR: Type 1" is compatible with the legacy gamma characteristic from 0 to V1. The curve of "HDR: Type 2" is compatible with the legacy gamma characteristic from 0 to V2. Furthermore, the curve of "HDR: Type 3" is compatible with the legacy gamma characteristic from 0 to V3. Note that the photoelectric conversion characteristics that can be selected by the electro-optical conversion unit 304 are not limited to these three.

[0076] Furthermore, when the information on the electro-optical conversion characteristics is a parameter for determining a curve of the electro-optical conversion characteristics, the electro-optical conversion unit 304 performs electro-optical conversion on the transmission video data based on the curve of the electro-optical conversion characteristics determined with the parameter. In this case, the coordinate data of the change point of the linked level mapping curve is given as a parameter, and the curve of the electro-optical conversion characteristics is determined so as to pass through this coordinate position or its vicinity. Then, the electro-optical conversion unit 304 performs electro-optical conversion based on this curve of the electro-optical conversion characteristics.

[0077] In this way, when the curve of the electro-optical conversion characteristic is obtained by the parameter, it is possible to limit the maximum level of the output video data to the maximum level information that can be displayed by obtaining the curve based on the maximum level information that can be displayed together with the parameter. Fig. 15 shows an example of the electro-optical conversion characteristic. Both the curve of "HDR:Type 1" and the curve of "HDR:Type 1'" are compatible with the legacy gamma characteristic from 0 to V1, but while the maximum level of the curve of "HDR:Type 1" is S'w, the maximum level of the curve of "HDR:Type 1'" is limited to S'w2, which is the maximum level that can be displayed.

[0078] In addition, both the "HDR:Type 2" curve and the "HDR:Type 2´" curve are compatible with legacy gamma characteristics from 0 to V2, but while the maximum level of the "HDR:Type 2" curve is S´w, the maximum level of the "HDR:Type 2´" curve is limited to S´w2, which is the maximum level that can be displayed. Furthermore, both the "HDR:Type 3" curve and the "HDR:Type 3´" curve are compatible with legacy gamma characteristics from 0 to V3, but while the maximum level of the "HDR:Type 3" curve is S´w, the maximum level of the "HDR:Type 3´" curve is limited to S´w2, which is the maximum level that can be displayed.

[0079] The operation of the display device 300 shown in Fig. 13 will be briefly described. The HDMI receiving unit 303 receives the transmission video data and the electric-optical conversion characteristic information of the transmission video data for each predetermined unit (for example, each scene, each program, etc.) from the set-top box 200 via the HDMI terminal 302. The electric-optical conversion characteristic information is sent to the control unit 301. In addition, the transmission video data is supplied to the electric-optical conversion unit 304.

[0080] In the electric-optical conversion unit 304, electric-optical conversion is performed based on information on electric-optical conversion characteristics for each predetermined unit provided by the control unit 301, to obtain output video data. In this case, when the electric-optical conversion characteristic information is type information, electric-optical conversion is performed on the transmission video data based on the electric-optical conversion characteristic curve of the type specified by the type information. Also, in this case, when the optical conversion characteristic information is a parameter for determining the electric-optical conversion characteristic curve, electric-optical conversion is performed on the transmission video data based on the electric-optical conversion characteristic curve determined by the parameter.

[0081] The transmission video data obtained by the electro-optical conversion unit 304 is supplied to the display unit 305. The display unit 305 displays an HDR image based on this output video data.

[0082] As described above, in the transmission / reception system 10 shown in Fig. 1, the transmission device 100 inserts information on the electrical-optical conversion characteristics for each predetermined unit of the transmission video data into the video stream layer and the container layer. Therefore, it becomes possible to selectively apply appropriate electrical-optical conversion characteristics according to the image contents to the HDR video data for each predetermined unit, perform electrical conversion, and transmit the data.

[0083] 1, the display device 300 performs electro-optical conversion on the transmission video data received from the set-top box 200 based on information on electro-optical conversion characteristics of each predetermined unit of the transmission video data to obtain output video data. Therefore, the HDR video data before being photoelectrically converted by the transmission device 100 can be reproduced, enabling good display of HDR images.

[0084] 1, when the electro-optical conversion characteristic information is a parameter for determining a curve of the electro-optical conversion characteristic, the display device 300 determines the curve of the electro-optical conversion characteristic based on the parameter as well as the maximum level information that can be displayed, thereby limiting the maximum level of the output video data from the electro-optical conversion unit 304 to the maximum level information that can be displayed. Therefore, the display unit (display) 305 can display an HDR image satisfactorily without causing whiteout or the like.

[0085] 1, the set-top box 200 inserts the electro-optical conversion characteristic information for each predetermined unit of the transmission video data into a blanking period of the transmission video data, and transmits the information to the display device 300. This makes it easy to transmit the electro-optical conversion characteristic information in association with the transmission video data.

[0086] <2. Modifications> In the above embodiment, the electro-optical conversion characteristic information is inserted into the video stream layer and the transport stream (container) layer, but the electro-optical conversion characteristic information may be inserted into only one of them. Also, a series of percentage values ​​are treated as relative values ​​relative to a reference value of 100cd / m2, with a brightness of 100cd / m2 being 100%, but this is not necessarily required. The reference value of 100% may be set to a brightness other than 100cd / m2. In that case, it is necessary to associate the cd / m2 value with the percentage separately.

[0087] In the above-described embodiment, the transmission / reception system 10 is configured with the transmission device 100, the set-top box 200, and the display device 300. However, as shown in Fig. 16, a transmission / reception system 10A may be configured with the transmission device 100 and a reception device 200A having a display unit.

[0088] FIG. 17 shows a configuration example of the receiving device 200A. In FIG. 17, the parts corresponding to FIG. 10 and FIG. 13 are given the same reference numerals, and detailed description thereof is omitted as appropriate. This receiving device 200A has a control unit 201A, a receiving unit 202, a system decoder 203, a video decoder 204, an electric-to-optical converter 304, and a display unit 305. The electric-to-optical converter 304 performs electric-to-optical conversion on the transmission video data obtained by the video decoder 204 based on information on electric-to-optical conversion characteristics for each predetermined unit provided by the control unit 201A, to obtain output video data. The display unit 305 displays an HDR image based on this output video data.

[0089] In the above embodiment, the set-top box 200 and the display device 300 are connected via an HDMI digital interface. However, the present technology can be applied to a case where these are connected via a digital interface (including wireless as well as wired) similar to the HDMI digital interface.

[0090] [MPEG-DASH-based transmission and reception system] This technology can also be applied to an MPEG-DASH-based transmission / reception system. Fig. 18 shows a configuration example of an MPEG-DASH-based transmission / reception system 10B. This transmission / reception system 10B has a configuration in which N receivers 403 are connected to a DASH stream file server 401 and a DASH MPD server 402 via a network 404 such as the Internet.

[0091] The DASH stream file server 401 generates DASH-specification stream segments (hereinafter referred to as "DASH segments") based on media data of specified content (video data, audio data, subtitle data, etc.), and transmits the specified stream segments to the requesting receiver 403 in response to a request from the receiver 403.

[0092] The DASH MPD server 402 generates an MPD file for acquiring DASH segments generated in the DASH stream file server 401. The DASH MPD server 402 generates an MPD file based on content metadata from a content management server (not shown) and addresses (urls) of segments generated in the DASH stream file server 401. In response to a request from the receiver 403, the DASH MPD server 402 transmits the MPD file to the requesting receiver 403.

[0093] In the MPD format, an adaptation set that describes coding-related information for video and audio is defined for each stream such as video and audio, and each attribute is described below. For example, if the video data included in the DASH segment corresponds to the coded data of the transmission video data in the above embodiment, and is obtained by selectively applying photoelectric conversion characteristics according to the image contents to the HDR video data for each predetermined unit (for example, scene unit or program unit) and performing photoelectric conversion, the MPD file describes information on the photoelectric conversion characteristics corresponding to the photoelectric conversion characteristics. This corresponds to the insertion of an HDR descriptor into the layer of the transport stream TS in the above embodiment.

[0094] In this case, information on electrical-optical conversion characteristics for each predetermined unit of video data is inserted into the video data (video stream) included in the DASH segment, similar to the video stream in the above-described embodiment. For example, when the encoding method is HEVC, this electrical-optical conversion characteristic information is inserted as an HDR EOTF information SEI message (HDR_EOTF_information SEI message) into the "SEIs" portion of the access unit (AU).

[0095] In order to describe the electro-optical conversion characteristic information in the MPD file, for example, a schema as shown in Fig. 19 is newly defined. "service_video:high_dynamic_range" indicates whether the video display is HDR (High Dynamic Range). "0" indicates that it is not HDR, and "1" indicates that it is HDR.

[0096] "service_video:high_dynamic_range:eotf_compatible" indicates whether the electro-optical conversion characteristics are compatible with legacy gamma characteristics. "0" indicates compatible HDR electro-optical conversion characteristics, with partial compatibility with legacy gamma characteristics. "1" indicates incompatible HDR electro-optical conversion characteristics, with no compatibility with legacy gamma characteristics. "2" indicates legacy gamma characteristics.

[0097] "service_video:high_dynamic_range:eotf_type" indicates the type of electro-optical conversion characteristics. "0" indicates "type_1", "1" indicates "type_2", and "2" indicates "type_3". "service_video:high_dynamic_range:compressed_peak_level" indicates the percentage value of the maximum level of the encoded image data (transmitted video data) (a relative value where 100cd / m2 is, for example, 100%). "service_video:high_dynamic_range:number_of_mapping_periods" indicates the number of chained level mapping curves.

[0098] "service_video:high_dynamic_range:compressed_mapping_level" indicates the change in the level mapping curve on the level compression axis as a percentage value with "compressed_peak_level" set to 100%. "service_video:high_dynamic_range:uncompressed_mapping_level" indicates the change in the level mapping curve on the level uncompression axis as a percentage value with "uncompressed_peak_level" set to 100%.

[0099] FIG. 20 shows an example of a description of an MPD file including electro-optical conversion characteristic information. For example, <1> " indicates that the video display is HDR (High Dynamic Range). <0> " From the description, we can see that it is an HDR light-to-light conversion characteristic that is compatible with the legacy gamma characteristics. Also, for example, "service_video:high_dynamic_range:eotf_type <1> " From the description, we can see that the type of electro-optical conversion characteristic is "type_2".

[0100] FIG. 21 shows an example of the configuration of a Fragmented MP4 stream. A video Fragmented MP4 stream includes a Fragmented MP4 obtained by packetizing a video stream. A predetermined number of pictures of the video stream are inserted into the "mdat" portion of the Fragmented MP4. In this video stream, as in the above embodiment, for example, an HDR EOTF information SEI message (HDR_EOTF_information SEI message) is inserted for each GOP.

[0101] Then, similarly to the above-described embodiment, the receiver 403 performs electro-optical conversion on the received video data based on the electro-optical conversion characteristic information included in the HDR EOTF Information SEI message or the electro-optical conversion characteristic information described in the MPD file. This makes it possible to reproduce the HDR video data before the electro-optical conversion on the transmitting side, for example, and to display HDR images in a good condition. Note that since the receiver 403 acquires the MPD file in advance, it is also possible to prepare the characteristics of the electro-optical conversion unit in advance based on the electro-optical conversion characteristic information included therein.

[0102] 18 transmits a segment of a predetermined stream generated by a DASH stream file server 401 and an MPD file generated by a DASH MPD server 402 to a receiver 403 via a network 404. However, as shown in FIG. 22, a transmission / reception system 10C can be configured in a similar manner to transmit a segment of a predetermined stream generated by a DASH stream file server 401 and an MPD file generated by a DASH MPD server 402 to a receiver 403 via broadcast waves from a broadcast station 405.

[0103] The present technology can also be configured as follows. (1) a processing unit that performs photoelectric conversion on input video data having a level range of 0% to 100%*N (N is a number greater than 1) to obtain transmission video data; a transmitting unit for transmitting a container including a video stream obtained by encoding the transmission video data; An information inserting unit is provided for inserting information on electrical-optical conversion characteristics of each predetermined unit of the transmitted video data into the layer of the video stream and / or the layer of the container. Transmitting device. (2) The above-mentioned predetermined unit is a scene unit or a program unit. The transmitting device according to (1) above. (3) The electro-optical conversion characteristic information is type information for specifying the type of electro-optical conversion characteristic. A transmitting device according to (1) or (2). (4) The electro-optical conversion characteristic information is a parameter for determining a curve of the electro-optical conversion characteristic. A transmitting device according to (1) or (2). (5) a processing step of performing photoelectric conversion on input video data having a level range of 0% to 100%*N (N is a number greater than 1) to obtain transmission video data; a transmitting step of transmitting a container including a video stream obtained by encoding the transmission video data by a transmitting unit; An information inserting step of inserting information on electrical-optical conversion characteristics for each predetermined unit of the transmitted video data into a layer of the video stream and / or a layer of the container. Transmission method. (6) a receiving unit for receiving a container in a predetermined format including a video stream obtained by encoding the transmitted video data, The transmission video data is obtained by photoelectrically converting input video data having a level range of 0% to 100%*N (N is a number greater than 1); information on electrical-optical conversion characteristics for each predetermined unit of the transmitted video data is inserted into a layer of the video stream and / or a layer of the container; The video stream is further provided with a processing unit that processes the video stream included in the container received by the receiving unit. Receiving device. (7) The processing unit is a decoding unit for decoding the video stream to obtain the transmission video data; an electric-optical conversion section for performing electric-optical conversion on the transmission video data obtained by the decoding section based on information on the electric-optical conversion characteristic for each predetermined unit, to obtain output video data; The receiving device according to (6) above. (8) the electro-optical conversion characteristic information is type information for specifying a type of electro-optical conversion characteristic, The electro-optical conversion unit is performing electro-optical conversion on the transmission video data based on the electro-optical conversion characteristic curve of the type designated by the type information; The receiving device according to (7) above. (9) The electro-optical conversion characteristic information is a parameter for determining a curve of the electro-optical conversion characteristic, The electro-optical conversion unit is Based on the curve of the electrical-optical conversion characteristic obtained from the parameters, electrical-optical conversion is performed on the transmitted video data. The receiving device according to (7) above. (10) the electro-optical conversion characteristic curve used in the electro-optical conversion unit is obtained based on maximum level information that can be displayed together with the parameters; The maximum level of the output video data is limited to the maximum level information that can be displayed. The receiving device according to (9) above. (11) The processing unit is a decoding unit for decoding the video stream included in the container to obtain transmission video data; a transmitting section for transmitting the transmission video data obtained by the decoding section and electrical-optical conversion characteristic information for each predetermined unit of the transmission video data to an external device in association with each other; The receiving device according to (6) above. (12) The transmitting unit is Transmitting the transmission video data to the external device by differential signals through a predetermined number of channels; The information on the electro-optical conversion characteristics is inserted into a blanking period of the transmission video data, thereby transmitting the electro-optical conversion characteristics information to the external device. The receiving device according to (11) above. (13) A receiving step of receiving, by a receiving unit, a container in a predetermined format including a video stream obtained by encoding the transmitted video data, The transmission video data is obtained by photoelectrically converting input video data having a level range of 0% to 100%*N (N is a number greater than 1); information on electrical-optical conversion characteristics for each predetermined unit of the transmitted video data is inserted into a layer of the video stream and / or a layer of the container; The method further includes a processing step of processing the video stream contained in the container received in the receiving step. Receiving method. (14) a receiving unit for receiving from an external device transmission video data and information on electrical-optical conversion characteristics of the transmission video data for each predetermined unit, the information being associated with the transmission video data; an electro-optical conversion section for performing electro-optical conversion on the transmission video data received by the receiving section based on information on the electro-optical conversion characteristic for each predetermined unit, to obtain output video data; Display device. (15) the electro-optical conversion characteristic information is type information for specifying a type of electro-optical conversion characteristic, The electro-optical conversion unit is performing electro-optical conversion on the transmission video data based on the electro-optical conversion characteristic curve of the type designated by the type information; The display device according to (14) above. (16) The electro-optical conversion characteristic information is a parameter for determining a curve of the electro-optical conversion characteristic, The electro-optical conversion unit is Based on the curve of the electrical-optical conversion characteristic obtained from the parameters, electrical-optical conversion is performed on the transmitted video data. The display device according to (14) above. (17) the electro-optical conversion characteristic curve used in the electro-optical conversion unit is obtained based on maximum level information that can be displayed together with the parameters; The maximum level of the output video data is limited to the maximum level information that can be displayed. The display device according to (16) above. (18) a receiving step of receiving, by a receiving unit, transmitted video data and information on electrical-optical conversion characteristics of the transmitted video data for each predetermined unit, from an external device, the information being associated with the transmitted video data; an electro-optical conversion step for performing electro-optical conversion on the transmission video data received in the receiving step based on information on the electro-optical conversion characteristics for each predetermined unit to obtain output video data; Display method. (19) a first transmitting unit for transmitting a container including a video stream composed of encoded data of transmission video data obtained by performing photoelectric conversion on input video data having a level range of 0% to 100%*N (N is a number greater than 1); a second transmitting unit for transmitting a metafile having information for acquiring the video stream at a receiving side; Information on electrical-optical conversion characteristics for each predetermined unit of the transmitted video data is inserted into the video stream and / or the metafile. Transmitting device. (20) A transmitting unit for transmitting a container including a video stream including encoded data of transmission video data obtained by photoelectrically converting input video data having a level range of 0% to 100%*N (N is a number greater than 1), Information on electrical-optical conversion characteristics for each predetermined unit of the transmitted video data is inserted into a layer of the video stream and / or a layer of the container. Transmitting device.

[0104] The main feature of this technology is that by inserting information on the electrical-optical conversion characteristics for each specified unit of transmitted video data into the video stream layer or container layer, it is possible for the transmitting side to selectively apply appropriate electrical-optical conversion characteristics according to the image content for each specified unit of HDR video data to perform electrical-optical conversion (see Figure 9). [Explanation of symbols]

[0105] 10,10A~10C...Transmitting and receiving system 100 Transmitting device 101...Control section 102 Camera 103... Photoelectric conversion unit 104: Video Encoder 105 System Encoder 106 Transmitter 200··Set-top box 200A···Receiver 201, 201A...Control unit 202 Receiving unit 203 System Decoder 204: Video decoder 205 HDMI transmitter 206 HDMI terminal 300...Display device 301 Control section 302 HDMI terminal 303 HDMI receiver 304: Electric-optical converter 305...Display section 401...DASH stream file server 402...DASH MPD Server 403...Receiver 404...Net 405···Broadcasting Station

Claims

1. a processor for applying photoelectric conversion characteristics to the high dynamic range image; a generating unit that generates meta information of an image generated by applying the photoelectric conversion characteristic, The meta-information is information on a conversion characteristic corresponding to the photoelectric conversion characteristic, and the conversion characteristic is partially compatible with a legacy gamma characteristic. Processing unit.

2. The conversion characteristic curve has a portion of a legacy gamma characteristic curve and a portion of a curve that has a different slope from the legacy gamma characteristic curve. The processing device of claim 1 .

3. The information regarding the conversion characteristics is type information that identifies the conversion characteristics. The processing device according to claim 2 .

4. The information on the conversion characteristics is a parameter for determining a curve of the conversion characteristics. The processing device according to claim 2 .

5. The maximum level of luminance of the transfer characteristic curve is greater than the maximum level of luminance of the legacy gamma characteristic curve. The processing device of claim 1 .

6. a processor for applying photoelectric conversion characteristics to the high dynamic range image; a generating unit that generates meta information of an image generated by applying the photoelectric conversion characteristic, The meta-information is information regarding a conversion characteristic corresponding to the photoelectric conversion characteristic, and the conversion characteristic is partially compatible with a gamma characteristic of a non-high dynamic range. Processing unit.

Images