WO2018159570A1 - Image signal generation device, reception device, television receiver, transmission/reception system, control program, and recording medium - Google Patents

Image signal generation device, reception device, television receiver, transmission/reception system, control program, and recording medium Download PDF

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Publication number
WO2018159570A1
WO2018159570A1 PCT/JP2018/007093 JP2018007093W WO2018159570A1 WO 2018159570 A1 WO2018159570 A1 WO 2018159570A1 JP 2018007093 W JP2018007093 W JP 2018007093W WO 2018159570 A1 WO2018159570 A1 WO 2018159570A1
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Prior art keywords
gradation
video
gradation range
luminance
unit
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PCT/JP2018/007093
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French (fr)
Japanese (ja)
Inventor
鈴木　秀樹
靖 手塚
茂樹 谷口
智夫 西垣
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シャープ株式会社
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Publication of WO2018159570A1 publication Critical patent/WO2018159570A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/02—Arrangements for generating broadcast information; Arrangements for generating broadcast-related information with a direct linking to broadcast information or to broadcast space-time; Arrangements for simultaneous generation of broadcast information and broadcast-related information
    • H04H60/07—Arrangements for generating broadcast information; Arrangements for generating broadcast-related information with a direct linking to broadcast information or to broadcast space-time; Arrangements for simultaneous generation of broadcast information and broadcast-related information characterised by processes or methods for the generation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/09—Arrangements for device control with a direct linkage to broadcast information or to broadcast space-time; Arrangements for control of broadcast-related services
    • H04H60/13—Arrangements for device control affected by the broadcast information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/35—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users
    • H04H60/48—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for recognising items expressed in broadcast information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/235—Processing of additional data, e.g. scrambling of additional data or processing content descriptors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/435—Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
    • H04N21/4402—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display

Definitions

  • the present invention relates to a video signal generation device that generates a video signal including video data and metadata, and a reception device that receives a video signal including video data.
  • HDR high-luminance video display
  • the maximum luminance of video that can be displayed differs depending on the display device used. Therefore, it is necessary to adjust the luminance data.
  • Patent Document 1 discloses a server device of a communication system that can be connected between many sites, and distributes an image adjusted to the characteristics of the display used on the receiving side to the other side. Technology is disclosed.
  • HDR enables high-luminance video display, but the maximum luminance of video that can be displayed varies depending on the display device used. For this reason, in the conversion from tone values to luminance values (tone mapping), if an extremely high-brightness image is to be expressed with high fidelity, the low and medium tones are crushed (the luminance after conversion becomes low). ), The video may be difficult to see.
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide a technique capable of displaying an image with luminance reflecting the intention at the time of creation.
  • a video signal generation device is a video signal generation device that generates a video signal including video data and metadata, and relates to a video indicated by the video data. And a metadata generation unit that generates metadata including gradation range designation information that designates a gradation range for adjusting gradation characteristics.
  • a receiving device is a receiving device that receives a video signal including video data, and adjusts a gradation characteristic for a video indicated by the video data.
  • An acquisition unit that acquires gradation range specification information that specifies a gradation range, and a conversion unit that performs luminance conversion of a video indicated by the video data with reference to the gradation range specification information acquired by the acquisition unit Yes.
  • a transmission / reception system receives a video signal generation device that generates a video signal including video data and metadata, and the video signal including the video data.
  • a transmission / reception system including a reception device wherein the video signal generation device generates metadata including gradation range designation information for designating a gradation range for adjusting a gradation characteristic with respect to a video indicated by the video data.
  • a metadata generation unit wherein the reception device acquires the gradation range designation information, and refers to the gradation range designation information acquired by the acquisition unit, and the luminance of the video indicated by the video data
  • a conversion unit that performs conversion.
  • a video signal generation method is a video signal generation method by a video signal generation device that generates a video signal including video data and metadata.
  • a luminance conversion method is a luminance conversion method by a reception device that receives a video signal including video data, and relates to a video indicated by the video data.
  • FIG. 1 It is a block diagram which shows the structure of the display apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the external appearance of the television receiver provided with the display apparatus which concerns on Embodiment 1 of this invention. It is a flowchart explaining the brightness
  • (A)-(c) are the graphs for demonstrating the gradation range designation
  • FIG. (A)-(c) is a graph for demonstrating the conversion function in the specific example 1 of Embodiment 1.
  • FIG. (A)-(c) is a graph for demonstrating the conversion function in the specific example 2 of Embodiment 1.
  • FIG. (A)-(c) is a graph for demonstrating the conversion function in the specific example 3 of Embodiment 1.
  • FIG. (A)-(c) is a graph for demonstrating the conversion function in the specific example 4 of Embodiment 1.
  • FIG. It is a block diagram which shows the structure of the display apparatus which concerns on Embodiment 2 of this invention. It is a flowchart explaining the brightness
  • FIG. 1 is a block diagram illustrating a configuration of a display device 1 according to the present embodiment.
  • FIG. 2 is a block diagram showing an appearance of the television receiver 100 including the display device 1.
  • the display device 1 includes a receiving unit 2, a processing unit 3, and a display unit 4.
  • the receiving unit 2 receives a broadcast wave including video data.
  • the processing unit 3 acquires tone range designation information for designating a tone range for adjusting the tone characteristics for the video indicated by the video data received by the receiving unit 2, and refers to the tone range designation information, Brightness conversion of the video indicated by the video data is performed.
  • the display unit 4 displays the video data with the luminance after the luminance conversion by the processing unit 3.
  • Examples of the display unit 4 include a liquid crystal display, an organic EL display, a plasma display, and an LED display.
  • the processing unit 3 includes a demodulation unit 5, an encryption / decryption unit 6, a demultiplexing unit 7, a video signal decoding unit 8, an audio signal decoding unit 9, and a reading unit 10 (acquiring unit in claims). ), A switching unit 11, a conversion unit 12, and a display control unit 13.
  • the demodulator 5 demodulates the broadcast signal received by the receiver 2.
  • the encryption / decryption unit 6 decrypts the broadcast signal demodulated by the demodulation unit 5.
  • the demultiplexing unit 7 demultiplexes the broadcast signal decoded by the encryption / decryption unit 6 into a video signal (video data), an audio signal, and metadata.
  • video signal in the present embodiment is preferably an HDR video signal, but there is no particular limitation.
  • the video signal decoding unit 8 decodes the video signal separated by the demultiplexing unit 7 by demultiplexing.
  • the audio signal decoding unit 9 decodes the audio signal separated by the demultiplexing unit 7 by demultiplexing.
  • the reading unit 10 includes a tone range designation information that designates a tone range for adjusting tone characteristics, and a demultiplexing unit 7 demultiplexes the video indicated by the video signal decoded by the video signal decoding unit 8. Read from the separated metadata. Details of the gradation range designation information will be described later.
  • the switching unit 11 refers to the gradation range designation information read by the reading unit 10 and switches a conversion function for converting the gradation value included in the video signal into a luminance value.
  • the conversion unit 12 converts the gradation value included in the video signal decoded by the video signal decoding unit 8 into a luminance value using the conversion function switched by the switching unit 11.
  • the display control unit 13 controls the display unit 4 so that the display unit 4 displays an image with the luminance value converted by the conversion unit 12.
  • FIG. 3 is a flowchart showing the flow of the luminance conversion method of the display device 1.
  • the receiving unit 2 receives a broadcast wave including video data (step S0).
  • the demodulator 5 demodulates the broadcast signal received by the receiver 2 (step S1).
  • the encryption / decryption unit 6 decrypts the broadcast signal demodulated by the demodulation unit 5 (step S2).
  • the demultiplexing unit 7 demultiplexes the broadcast signal decoded by the encryption / decryption unit 6 into a video signal (video data), an audio signal, and metadata (step S3).
  • the video signal decoding unit 8 decodes the video signal separated by the demultiplexing unit 7 by demultiplexing (step S4).
  • gradation range designation information for designating a gradation range for adjusting the gradation characteristics is received by the demultiplexing unit 7.
  • the gradation range designation information read by the reading unit 10 may be information that designates a gradation range that is converted differently from the other gradation ranges when the gradation value is converted into a luminance value. Examples of the information gradation range designation information include a center value, a lower limit value, and an upper limit value in the gradation range of gradation values included in the video signal.
  • the switching unit 11 switches the conversion function for converting the gradation value included in the video signal into the luminance value with reference to the gradation range designation information read by the reading unit 10 (step S6). .
  • the switching unit 11 switches the conversion function.
  • the switching unit 11 switches the table indicating the correspondence between the gradation value and the luminance value in order to set the luminance value from the gradation value. Also good.
  • the conversion unit 12 converts the gradation value included in the video signal decoded by the video signal decoding unit 8 into a luminance value using the conversion function switched by the switching unit 11 (step S7).
  • the conversion unit 12 may convert the gradation value into the luminance value using the table.
  • the display control unit 13 controls the display unit 4 so that the display unit 4 displays an image with the luminance value converted by the conversion unit 12 (step S8).
  • FIGS. 4A to 4C are graphs for explaining the above-described gradation range designation information, in which the horizontal axis represents gradation values before conversion using a conversion function, and the vertical axis represents The luminance value after conversion.
  • FIG. 4A is a graph when the gradation value included in the HDR video signal is converted into a luminance value without being compressed.
  • the solid line in FIG. 4A is a graph when such a gradation value is compressed and converted into a luminance value so as to match the luminance range that can be displayed on the display.
  • the luminance value corresponding to the intermediate gradation range near the gradation value 128 is reduced by the compression.
  • the gradation value is converted into a luminance value with reference to the above-described gradation range designation information.
  • gradation range designation information examples include Fit_low (lower limit of gradation to be easily visible) indicating the lower limit value of the specified gradation range and Fit_high (upper limit of gradation to be easily visible) indicating the upper limit value.
  • the gradation value 120 shown in FIG. 4B corresponds to Fit_low
  • the gradation value 140 corresponds to Fit_high.
  • the gradation value 80 shown in FIG. 4C corresponds to Fit_low
  • the gradation value 100 corresponds to Fit_high.
  • step S6 the conversion function for converting the gradation value into the luminance value is switched by referring to such a gradation range. Note that the conversion function switched by the switching unit 11 depends not only on the gradation range designation information but also on the luminance range that the display unit 4 can display.
  • FIGS. 5A to 5C are graphs for explaining a conversion function that the switching unit 11 switches with reference to the gradation range designation information, and the horizontal axis represents a level before conversion using the conversion function. It is a gradation value, and the vertical axis is a luminance value after conversion.
  • a range A from luminance L1 to luminance L2 is a luminance range that can be displayed by the display unit 4
  • a gradation value S1 is a gradation specified by the gradation range designation information.
  • the lower limit value of the range, and the gradation value S2 is an upper limit value of the gradation range specified by the gradation range specification information.
  • the dotted line is a graph when the gradation value is converted into a luminance value without being compressed.
  • the display unit 4 whose displayable luminance range is the range A displays an image with the luminance value indicated by the dotted line, only the luminance value indicated by the solid line can be displayed. Therefore, the gradation on the high gradation side and the gradation on the low gradation side are crushed and cannot be expressed.
  • the gradation value S1 is changed to the gradation value. In the gradation range of the value S2, the luminance value after conversion is lowered.
  • step S6 the switching unit 11 switches the conversion function with reference to the gradation range designation information (the gradation range from the gradation value S1 to the gradation value S2).
  • the solid line in (c) of FIG. 5 indicates the luminance value after conversion by the conversion unit 12 in step S7 using the conversion function switched by the switching unit 11 in step S6 and the gradation value (horizontal axis) before conversion. It is a graph with (vertical axis).
  • the conversion function is the same EOTF function as the inverse function of the OETF function used when generating the video signal in the gradation range from the gradation value S1 to the gradation value S2.
  • the conversion unit 12 converts the gradation value in the gradation range from the gradation value S1 to the gradation value S2 into the luminance value using such a conversion function, so that the gradation value from the gradation value S1 to the gradation value S2 is obtained.
  • the video displayed by the display unit 4 with the converted luminance value is a video reflecting the intention of the video creator.
  • the conversion function in the gradation range other than the gradation range from the gradation value S1 to the gradation value S2 is the luminance that can be displayed by the display unit 4 in the graph of the gradation value before conversion and the luminance value after conversion.
  • the gamma curve of the range is a conversion function that converts the gradation value into a luminance value so as to be continuously connected to the gamma curve of the gradation range from the gradation value S1 to the gradation value S2 in S1 and S2. Is preferred.
  • FIGS. 6A to 6C are graphs for explaining a conversion function that the switching unit 11 switches with reference to the gradation range designation information, and the horizontal axis represents a level before conversion using the conversion function. It is a gradation value, and the vertical axis is a luminance value after conversion.
  • a range B from luminance L3 to luminance L4 is a luminance range that can be displayed by the display unit 4
  • a gradation value S3 is a gradation specified by the gradation range designation information.
  • the gradation value S4 is the lower limit value of the range
  • the gradation value S4 is the upper limit value of the gradation range specified by the gradation range designation information.
  • the dotted line is a graph when the gradation value is converted into a luminance value without being compressed.
  • the display unit 4 whose displayable luminance range is the range B displays an image with the luminance value indicated by the dotted line, only the luminance value indicated by the solid line can be displayed. Therefore, the gradation on the high gradation side and the gradation on the low gradation side are crushed and cannot be expressed.
  • the gradation value S3 is changed to the gradation value. In the gradation range of the value S4, the luminance value after conversion on the low gradation side becomes high.
  • step S6 the switching unit 11 switches the conversion function with reference to the gradation range designation information (the gradation range from the gradation value S3 to the gradation value S4).
  • the solid line in FIG. 6C indicates the luminance value after the conversion by the conversion unit 12 in step S7 before conversion using the conversion function switched by the switching unit 11 in step S6 (horizontal axis). It is a graph with (vertical axis).
  • the conversion function is an EOTF function obtained by adding an offset to the inverse function of the OETF function used when generating the video signal in the gradation range from the gradation value S3 to the gradation value S4.
  • the conversion unit 12 converts the gradation value in the gradation range from the gradation value S1 to the gradation value S2 into a luminance value using such a conversion function, so that the gradation value before conversion and the luminance value after conversion are converted.
  • the slope of the gamma curve in the gradation range from the gradation value S3 to the gradation value S4 is equivalent to the inclination of the gamma curve when the gradation value is converted into a luminance value without being compressed.
  • the video displayed by the display unit 4 with the converted luminance value becomes a video expressing the gradation intended by the video producer.
  • the conversion function in the gradation range other than the gradation range from the gradation value S3 to the gradation value S4 is the luminance that can be displayed by the display unit 4 in the graph of the gradation value before conversion and the luminance value after conversion.
  • the gamma curve of the range is a conversion function that converts the gradation value into a luminance value so as to be continuously connected to the gamma curve of the gradation range from the gradation value S3 to the gradation value S4 in S3 and S4, respectively. Is preferred.
  • FIGS. 7A to 7C are graphs for explaining the conversion function that the switching unit 11 switches with reference to the gradation range designation information, and the horizontal axis represents the level before conversion using the conversion function. It is a gradation value, and the vertical axis is a luminance value after conversion.
  • a range C from luminance L5 to luminance L6 is a luminance range that can be displayed by the display unit 4
  • a gradation value S5 is a gradation specified by the gradation range designation information. This is the lower limit value of the range
  • the tone value S6 is the upper limit value of the tone range designated by the tone range designation information.
  • the dotted line is a graph when the gradation value is converted into a luminance value without being compressed.
  • the display unit 4 whose displayable luminance range is the range C displays an image with the luminance value indicated by the dotted line, only the luminance value indicated by the solid line can be displayed. Therefore, the gradation on the high gradation side and the gradation on the low gradation side are crushed and cannot be expressed.
  • the gradation value S5 is changed to the gradation value. In the gradation range of value S6, the luminance value after conversion is lowered.
  • step S6 the switching unit 11 switches the conversion function with reference to the gradation range designation information (the gradation range from the gradation value S5 to the gradation value S6).
  • the solid line in (c) of FIG. 7 indicates the luminance value after conversion by the conversion unit 12 in step S7 using the conversion function switched by the switching unit 11 in step S6 and the gradation value (horizontal axis) before conversion. It is a graph with (vertical axis).
  • the conversion function converts the gradation value into the luminance value so that the luminance value corresponding to the gradation range from the gradation value S5 to the gradation value S6 is higher than the luminance value when the gradation range designation information is not referred to.
  • Conversion function to convert As a result, this is a conversion function for shifting the gamma curve to the intermediate luminance side in the graph of the gradation value before conversion and the luminance value after conversion.
  • the conversion unit 12 converts the gradation value into the luminance value using such a conversion function
  • the video displayed by the display unit 4 with the converted luminance value is converted without compressing the gradation value.
  • the image is expressed with the same gradation as the image displayed with the luminance value.
  • the gradation characteristic indicated by the gradation value and the luminance value converted by the luminance conversion method in this specific example may be different from the gradation characteristic indicated by the gradation value and the luminance value converted without compression. .
  • the conversion function in the gradation range other than the gradation range from the gradation value S5 to the gradation value S6 is a luminance that can be displayed by the display unit 4 in the graph of the gradation value before the conversion and the luminance value after the conversion.
  • the gamma curve in the range is a conversion function that converts the gradation value into a luminance value so as to be continuously connected to the gamma curve in the gradation range from the gradation value S5 to the gradation value S6 in S5 and S6. Is preferred.
  • (A) to (c) of FIG. 8 are graphs for explaining the conversion function that the switching unit 11 switches with reference to the gradation range designation information, and the horizontal axis represents the level before conversion using the conversion function. It is a gradation value, and the vertical axis is a luminance value after conversion. 8A to 8C, a range D from luminance L7 to luminance L8 is a luminance range that can be displayed by the display unit 4, and a gradation value S7 is a gradation specified by the gradation range designation information. The lower limit value of the range, and the gradation value S8 is the upper limit value of the gradation range specified by the gradation range specification information.
  • the dotted line is a graph when the gradation value is converted into a luminance value without being compressed.
  • the display unit 4 whose displayable luminance range is the range D displays an image with the luminance value indicated by the dotted line, only the luminance value indicated by the solid line can be displayed. Therefore, the gradation on the high gradation side and the gradation on the low gradation side are crushed and cannot be expressed.
  • the solid line in FIG. 8B when the gradation value is compressed and converted into a luminance value so as to fit the luminance range D that can be displayed by the display unit 4, the gradation value S7 is changed to the gradation value. In the gradation range of value S8, the luminance value after conversion is lowered.
  • step S6 the switching unit 11 switches the conversion function with reference to the gradation range designation information (the gradation range from the gradation value S7 to the gradation value S8).
  • the solid line in (c) of FIG. 8 indicates the luminance value after conversion by the conversion unit 12 in step S7 using the conversion function switched by the switching unit 11 in step S6 and the gradation value (horizontal axis) before conversion. It is a graph with (vertical axis).
  • the conversion function is an EOTF function having a larger slope than the inverse function of the OETF function used when generating the video signal in the gradation range from the gradation value S7 to the gradation value S8.
  • this is a conversion function for extending the gamma curve in the axial direction of the luminance value.
  • the conversion unit 12 converts the gradation value into the luminance value using such a conversion function
  • the video displayed by the display unit 4 with the converted luminance value is converted without compressing the gradation value.
  • the image is expressed with the same gradation as the image displayed with the luminance value.
  • the conversion function in the gradation range other than the gradation range from the gradation value S7 to the gradation value S8 is the luminance that can be displayed by the display unit 4 in the graph of the gradation value before conversion and the luminance value after conversion.
  • the gamma curve in the range is a conversion function that converts the gradation value into a luminance value so as to be continuously connected to the gamma curve in the gradation range from the gradation value S7 to the gradation value S8 in S7 and S8, respectively. Is preferred.
  • the display device 1 acquires tone range designation information for designating a tone range for adjusting the tone characteristics for the video indicated by the video data, and stores the tone range designation information. Referring to, luminance conversion of the video indicated by the video data is performed. With this configuration, it is possible to adjust the tone characteristics of the video based on the acquired tone range designation information. As a result, by using the gradation range designation information in which the creator of the image has designated the gradation range, the image can be displayed with a luminance that reflects the intention of the creator of the image.
  • the display device 1 acquires gradation range designation information from metadata included in the video signal. Thereby, since it is only necessary to acquire the gradation range designation information from the metadata included in the received video signal, a member for obtaining the gradation range designation information from the outside is unnecessary.
  • FIG. 9 is a block diagram illustrating a configuration of the display device 20 according to the present embodiment. As illustrated in FIG. 9, the display device 20 further includes a communication unit 21 in addition to the configuration of the display device 1 according to the first embodiment.
  • the communication unit 21 receives metadata including gradation range designation information that designates a gradation range for adjusting gradation characteristics via the Internet.
  • FIG. 10 is a flowchart showing the flow of the luminance conversion method executed by the display device 20. Note that description of steps similar to those described in Embodiment 1 is omitted.
  • the receiving unit 2 receives a broadcast wave including video data (step S10).
  • the communication unit 21 receives metadata including gradation range designation information that designates a gradation range for adjusting gradation characteristics via the Internet.
  • the demodulator 5 demodulates the broadcast signal received by the receiver 2 (step S12).
  • the encryption / decryption unit 6 decrypts the broadcast signal demodulated by the demodulation unit 5 (step S13).
  • the demultiplexing unit 7 demultiplexes the broadcast signal decoded by the encryption / decryption unit 6 into a video signal (video data) and an audio signal (step S14).
  • the video signal decoding unit 8 decodes the video signal separated by the demultiplexing unit 7 by demultiplexing (step S15).
  • the reading unit 10 has received the gradation range designation information for designating the gradation range for adjusting the gradation characteristics, by the communication unit 21. Read from the metadata (step S16).
  • the switching unit 11 refers to the gradation range designation information read by the reading unit 10 and switches the conversion function for converting the gradation value included in the video signal into a luminance value (step S17).
  • the conversion unit 12 converts the gradation value included in the video signal decoded by the video signal decoding unit 8 into a luminance value using the conversion function switched by the switching unit 11 (step S18).
  • the display control unit 13 controls the display unit 4 so that the display unit 4 displays an image with the luminance value converted by the conversion unit 12 (step S19).
  • the display device 20 receives the metadata including the gradation range designation information for designating the gradation range for adjusting the gradation characteristics via the Internet, and specifies the gradation range designation. With reference to the information, the luminance of the video indicated by the video data is converted. Thereby, unlike the first embodiment, even when the gradation range designation information is acquired via the Internet, the gradation characteristics of the video can be adjusted based on the gradation range designation information. As a result, by using the gradation range designation information in which the creator of the image has designated the gradation range, the image can be displayed with a luminance that reflects the intention of the creator of the image.
  • FIG. 11 is a block diagram illustrating a configuration of the transmission / reception system 101 according to the present embodiment.
  • the transmission / reception system 101 includes a transmission device 30 and the display device 1 according to the first embodiment or the display device 20 according to the second embodiment.
  • the transmission device 30 includes a processing unit 31 (corresponding to a video signal generation device in claims) and a transmission unit 32.
  • the processing unit 31 includes a video signal acquisition unit 33, an audio signal acquisition unit 34, a gradation range designation information acquisition unit 35, a video signal encoding unit 36, an audio signal encoding unit 37, and a generation unit 38 (metadata generation in claims)
  • a multiplexing unit 39, an encryption unit 40, and a modulation unit 41 is corresponding to a video signal generation device in claims.
  • the video signal acquisition unit 33 acquires a video signal from the outside.
  • the video signal in the present embodiment is preferably an HDR video signal, but there is no particular limitation.
  • the audio signal acquisition unit 34 acquires an audio signal from the outside.
  • the gradation range specification information acquisition unit 35 acquires gradation range specification information for specifying a gradation range for adjusting the gradation characteristics for the video indicated by the video signal acquired by the video signal acquisition unit 33.
  • the video signal encoding unit 36 encodes the video signal acquired by the video signal acquisition unit 33.
  • the audio signal encoding unit 37 encodes the audio signal acquired by the audio signal acquisition unit 34.
  • the generation unit 38 generates metadata including the gradation range designation information acquired by the gradation range specification information acquisition unit 35.
  • the multiplexing unit 39 multiplexes the video signal encoded by the video signal encoding unit 36, the audio signal encoded by the audio signal encoding unit 37, and the metadata generated by the generation unit 38.
  • the encryption unit 40 encrypts the data multiplexed by the multiplexing unit 39.
  • the modulation unit 41 modulates the data encrypted by the encryption unit 40.
  • the transmission unit 32 transmits the data modulated by the modulation unit 41 to the display device 1 or 20 as a broadcast wave.
  • FIG. 12 is a flowchart showing the flow of the video signal generation method executed by the transmission device 30.
  • step S20 the video signal acquisition unit 33 acquires a video signal from the outside, and the audio signal acquisition unit 34 acquires an audio signal from the outside.
  • the gradation range specification information acquisition unit 35 acquires gradation range specification information for specifying the gradation range for adjusting the gradation characteristics regarding the video indicated by the video signal acquired by the video signal acquisition unit 33. To do.
  • the gradation range designation information acquired by the gradation range designation information acquisition unit 35 is a floor that performs conversion different from other gradation ranges when the display device 1 or 20 converts gradation values into luminance values. It may be information that specifies a key range. Examples of the information gradation range designation information include a center value, a lower limit value, and an upper limit value in the gradation range of gradation values included in the video signal.
  • step S20 the video signal encoding unit 36 encodes the video signal acquired by the video signal acquisition unit 33, and the audio signal encoding unit 37 encodes the audio signal acquired by the audio signal acquisition unit 34. (Step S21).
  • the generation unit 38 generates metadata including the gradation range designation information acquired by the gradation range designation information acquisition unit 35 (step S22).
  • the multiplexing unit 39 multiplexes the video signal encoded by the video signal encoding unit 36, the audio signal encoded by the audio signal encoding unit 37, and the metadata generated by the generation unit 38. (Step S23).
  • the encryption unit 40 encrypts the data multiplexed by the multiplexing unit 39 (step S24).
  • the modulation unit 41 modulates the data encrypted by the encryption unit 40 (step S25).
  • the transmission unit 32 transmits the data modulated by the modulation unit 41 to the display device 1 or 20 as a broadcast wave (step S26).
  • Broadcast waves transmitted by the transmission unit 32 of the transmission device 30 are received by the display device 1 or the display device 20, and the display device 1 or the display device 20 executes the luminance conversion method described in the first or second embodiment.
  • the transmission device 30 included in the transmission / reception system 101 generates metadata including gradation range designation information that designates a gradation range for adjusting gradation characteristics regarding the video indicated by the video data.
  • the receiving device that has received the metadata including the generated gradation range designation information can adjust the gradation characteristics of the video based on the gradation range designation information.
  • the image can be displayed with a luminance that reflects the intention of the creator of the image.
  • the control block (particularly, the processing unit 3 or the processing unit 31) of the display device 1, the display device 20, or the transmission device 30 may be realized by a logic circuit (hardware) formed in an integrated circuit (IC chip) or the like. However, it may be realized by software using a CPU (Central Processing Unit).
  • a logic circuit hardware
  • IC chip integrated circuit
  • CPU Central Processing Unit
  • the display device 1, the display device 20, or the transmission device 30 has a CPU that executes instructions of a program that is software that realizes each function, and the program and various data are recorded so as to be readable by a computer (or CPU).
  • ROM Read Only Memory
  • storage device latter are referred to as “recording media”
  • RAM Random Access Memory
  • the objective of this invention is achieved when a computer (or CPU) reads the said program from the said recording medium and runs it.
  • a “non-temporary tangible medium” such as a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used.
  • the program may be supplied to the computer via an arbitrary transmission medium (such as a communication network or a broadcast wave) that can transmit the program.
  • an arbitrary transmission medium such as a communication network or a broadcast wave
  • one embodiment of the present invention can also be realized in the form of a data signal embedded in a carrier wave, in which the program is embodied by electronic transmission.
  • a video signal generation device (processing unit 31) according to aspect 1 of the present invention is a video signal generation device that generates a video signal including video data and metadata, and relates to a video indicated by the video data, and has gradation characteristics.
  • a metadata generation unit (generation unit 38) that generates metadata including gradation range designation information that designates a gradation range for adjusting the tone range.
  • the receiving device that has received the metadata including the generated gradation range designation information can adjust the gradation characteristics of the video based on the gradation range designation information.
  • the image can be displayed with a luminance that reflects the intention of the creator of the image.
  • a receiving device is a receiving device that receives a video signal including video data, and has a gradation range for adjusting a gradation characteristic with respect to the video indicated by the video data.
  • An acquisition unit (reading unit 10) that acquires gradation range specification information that specifies the image, and a conversion unit that performs luminance conversion of the video indicated by the video data with reference to the gradation range specification information acquired by the acquisition unit ( 12).
  • the gradation characteristics of the video can be adjusted based on the acquired gradation range designation information.
  • the image can be displayed with a luminance that reflects the intention of the creator of the image.
  • the receiving apparatus may acquire the gradation range designation information from metadata included in the video signal.
  • the conversion unit has the luminance corresponding to the gradation range specified by the gradation range specification information described above.
  • the luminance conversion of the video indicated by the video data may be performed by using a conversion function that improves the luminance when the gradation range designation information is not referred to.
  • the luminance range that can be displayed by the display is narrow, the luminance can be improved when the luminance after conversion corresponding to the specific gradation range is lowered.
  • the conversion unit In the reception device (display device 1 or 20) according to aspect 5 of the present invention, in any of the above aspects 2 to 4, the conversion unit generates the video data in a gradation range specified by the gradation range specification information.
  • the luminance conversion of the video indicated by the video data may be performed by using the same EOTF function as the inverse function of the OETF function used when performing the above.
  • the converted luminance corresponding to the specific gradation range is not in accordance with the intention of the video producer,
  • the gradation value can be converted into a luminance according to the luminance from which the gradation value is based.
  • the conversion unit In the reception device (display device 1 or 20) according to aspect 6 of the present invention, in any of the above aspects 2 to 4, the conversion unit generates the video data in the gradation range specified by the gradation range specification information.
  • the luminance conversion of the video indicated by the video data may be performed using an EOTF function obtained by adding an offset to the inverse function of the OETF function used at the time.
  • the converted luminance corresponding to the specific gradation range is not in accordance with the intention of the video producer,
  • the gradation value can be converted into a luminance according to an environment such as a luminance range that can be displayed on the display in accordance with the luminance that is the basis of the gradation value.
  • the conversion unit In the reception device (display device 1 or 20) according to aspect 7 of the present invention, in any of the above aspects 2 to 4, the conversion unit generates the video data in a gradation range specified by the gradation range specification information.
  • the luminance conversion of the video indicated by the video data may be performed using an EOTF function having a larger slope than the inverse function of the OETF function used in the process.
  • the gradation value can be converted into a luminance according to an environment such as a luminance range that can be displayed on the display in accordance with the luminance that is the basis of the gradation value.
  • a television receiver (100) according to aspect 8 of the present invention includes the receiving device according to any one of aspects 2 to 7.
  • the television receiver can obtain the effects that the receiving device has in each aspect.
  • a transmission / reception system (101) includes a video signal generation device (processing unit 31) that generates a video signal including video data and metadata, and reception that receives the video signal including the video data.
  • a transmission / reception system including a display device (display device 1 or 20), wherein the video signal generation device includes gradation range designation information for designating a gradation range for adjusting a gradation characteristic with respect to a video indicated by the video data.
  • a conversion unit (12) that performs luminance conversion of the video indicated by the video data with reference to the range designation information.
  • a video signal generation method is a video signal generation method by a video signal generation device (processing unit 31) that generates a video signal including video data and metadata, and the video indicated by the video data And a metadata generation step of generating metadata including gradation range designation information that designates a gradation range for adjusting gradation characteristics.
  • a luminance conversion method is a luminance conversion method by a receiving device that receives a video signal including video data, and specifies a gradation range for adjusting a gradation characteristic with respect to the video indicated by the video data.
  • the video signal generation device and the reception device may be realized by a computer.
  • the computer is operated as each unit (software element) included in the video signal generation device and the reception device.
  • a video signal generation device control program and a reception device control program for realizing the video signal generation device and the reception device on a computer, and a computer-readable recording medium on which the control program is recorded are also included in the scope of the present invention. enter.

Abstract

This reception device (display device 1 or 20) receives an image signal including image data, and is provided with: an acquisition unit (reading unit 10) which acquires gradation range designation information which designates, for an image represented by the image data, a gradation range in which gradation characteristics are adjusted; and a conversion unit (12) which converts the luminance of the image represented by the image data with reference to the gradation range designation information acquired by the acquisition unit.

Description

映像信号生成装置、受信装置、テレビジョン受像機、送受信システム、制御プログラム、及び記録媒体Video signal generating device, receiving device, television receiver, transmission / reception system, control program, and recording medium
　本発明は、映像データとメタデータとを含む映像信号を生成する映像信号生成装置と、映像データを含む映像信号を受信する受信装置とに関する。 The present invention relates to a video signal generation device that generates a video signal including video data and metadata, and a reception device that receives a video signal including video data.
　コンテンツにＨＤＲ情報（輝度データ等）を付加して、ダイナミックレンジを拡大した映像を表示するシステムが一般化しており、今後普及が進むと予想される。そして、ＨＤＲによって、高輝度の映像表示が可能となるが、表示することができる映像の最大輝度は、使用する表示装置によって異なる。そこで、輝度データを調整する必要がある。 ・ Systems that add HDR information (brightness data, etc.) to content and display images with an expanded dynamic range have become commonplace, and are expected to spread in the future. HDR enables high-luminance video display, but the maximum luminance of video that can be displayed differs depending on the display device used. Therefore, it is necessary to adjust the luminance data.
　輝度データを調整する技術として、特許文献１には、多くの拠点間で接続できる通信システムのサーバ装置で、受信側で使用しているディスプレイの特性に合わせて調整した映像を相手側へ配信する技術が開示されている。 As a technique for adjusting luminance data, Patent Document 1 discloses a server device of a communication system that can be connected between many sites, and distributes an image adjusted to the characteristics of the display used on the receiving side to the other side. Technology is disclosed.
日本国公開特許公報「特開２０１６－４０８６２号公報（２０１６年３月２４日公開）」Japanese Patent Publication “Japanese Patent Laid-Open No. 2016-40862 (published on March 24, 2016)”
　上述の通り、ＨＤＲによって、高輝度の映像表示が可能となるが、表示することができる映像の最大輝度は、使用する表示装置によって異なる。そのため、階調値から輝度値への変換（トーンマッピング）において、極めて高輝度の映像を忠実に階調表現しようとすると、低中階調がつぶれてしまい（変換後の輝度が低くなってしまい）、映像が見えにくくなることもある。 As described above, HDR enables high-luminance video display, but the maximum luminance of video that can be displayed varies depending on the display device used. For this reason, in the conversion from tone values to luminance values (tone mapping), if an extremely high-brightness image is to be expressed with high fidelity, the low and medium tones are crushed (the luminance after conversion becomes low). ), The video may be difficult to see.
　その場合、映像の作成者の意図として、中階調の部分に映像の重要な部分がある場合には、表示された映像は、意図に沿わない映像となってしまう。そこで、表示装置が表示できる最大輝度によらず、作成時の意図が、出力映像に反映できる技術が求められていた。 In that case, if there is an important part of the image in the middle gradation part as the intention of the creator of the image, the displayed image becomes an unintended image. Therefore, there has been a demand for a technique capable of reflecting the intention at the time of creation in the output video regardless of the maximum luminance that can be displayed by the display device.
　本発明は、上記の問題点に鑑みてなされたものであり、その目的は、作成時の意図が反映された輝度で映像を表示することができる技術を提供することにある。 The present invention has been made in view of the above problems, and an object of the present invention is to provide a technique capable of displaying an image with luminance reflecting the intention at the time of creation.
　上記の課題を解決するために、本発明の一態様に係る映像信号生成装置は、映像データとメタデータとを含む映像信号を生成する映像信号生成装置であって、上記映像データが示す映像に関し、階調特性を調整する階調範囲を指定する階調範囲指定情報を含むメタデータを生成するメタデータ生成部を備えている。 In order to solve the above problems, a video signal generation device according to an aspect of the present invention is a video signal generation device that generates a video signal including video data and metadata, and relates to a video indicated by the video data. And a metadata generation unit that generates metadata including gradation range designation information that designates a gradation range for adjusting gradation characteristics.
　上記の課題を解決するために、本発明の一態様に係る受信装置は、映像データを含む映像信号を受信する受信装置であって、上記映像データが示す映像に関し、階調特性を調整する階調範囲を指定する階調範囲指定情報を取得する取得部と、上記取得部が取得した階調範囲指定情報を参照して、上記映像データが示す映像の輝度変換を行う変換部とを備えている。 In order to solve the above-described problem, a receiving device according to one embodiment of the present invention is a receiving device that receives a video signal including video data, and adjusts a gradation characteristic for a video indicated by the video data. An acquisition unit that acquires gradation range specification information that specifies a gradation range, and a conversion unit that performs luminance conversion of a video indicated by the video data with reference to the gradation range specification information acquired by the acquisition unit Yes.
　上記の課題を解決するために、本発明の一態様に係る送受信システムは、映像データとメタデータとを含む映像信号を生成する映像信号生成装置と、上記映像データを含む上記映像信号を受信する受信装置とを含む送受信システムであって、上記映像信号生成装置は、上記映像データが示す映像に関し、階調特性を調整する階調範囲を指定する階調範囲指定情報を含むメタデータを生成するメタデータ生成部を備え、上記受信装置は、上記階調範囲指定情報を取得する取得部と、上記取得部が取得した上記階調範囲指定情報を参照して、上記映像データが示す映像の輝度変換を行う変換部とを備えている。 In order to solve the above problems, a transmission / reception system according to one aspect of the present invention receives a video signal generation device that generates a video signal including video data and metadata, and the video signal including the video data. A transmission / reception system including a reception device, wherein the video signal generation device generates metadata including gradation range designation information for designating a gradation range for adjusting a gradation characteristic with respect to a video indicated by the video data. A metadata generation unit, wherein the reception device acquires the gradation range designation information, and refers to the gradation range designation information acquired by the acquisition unit, and the luminance of the video indicated by the video data A conversion unit that performs conversion.
　上記の課題を解決するために、本発明の一態様に係る映像信号生成方法は、映像データとメタデータとを含む映像信号を生成する映像信号生成装置による映像信号生成方法であって、上記映像データが示す映像に関し、階調特性を調整する階調範囲を指定する階調範囲指定情報を含むメタデータを生成するメタデータ生成工程を含む。 In order to solve the above-described problem, a video signal generation method according to an aspect of the present invention is a video signal generation method by a video signal generation device that generates a video signal including video data and metadata. A metadata generation step of generating metadata including gradation range designation information for designating a gradation range for adjusting gradation characteristics with respect to an image indicated by data.
　上記の課題を解決するために、本発明の一態様に係る輝度変換方法は、映像データを含む映像信号を受信する受信装置による輝度変換方法であって、上記映像データが示す映像に関し、階調特性を調整する階調範囲を指定する階調範囲指定情報を取得する取得工程と、上記取得工程で取得した階調範囲指定情報を参照して、上記映像データが示す映像の輝度変換を行う変換工程とを含む。 In order to solve the above-described problem, a luminance conversion method according to one embodiment of the present invention is a luminance conversion method by a reception device that receives a video signal including video data, and relates to a video indicated by the video data. An acquisition step for acquiring gradation range specification information for specifying a gradation range for adjusting characteristics, and a conversion for performing luminance conversion of the video indicated by the video data with reference to the gradation range specification information acquired in the acquisition step. Process.
　本発明の一態様によれば、作成時の意図が反映された輝度で映像を表示することができる。 According to one embodiment of the present invention, it is possible to display an image with luminance that reflects the intention at the time of creation.
本発明の実施形態１に係る表示装置の構成を示すブロック図である。It is a block diagram which shows the structure of the display apparatus which concerns on Embodiment 1 of this invention. 本発明の実施形態１に係る表示装置を備えているテレビジョン受像機の外観を示す図である。It is a figure which shows the external appearance of the television receiver provided with the display apparatus which concerns on Embodiment 1 of this invention. 本発明の実施形態１に係る輝度変換方法を説明するフローチャートである。It is a flowchart explaining the brightness | luminance conversion method which concerns on Embodiment 1 of this invention. （ａ）～（ｃ）は、実施形態１で用いられる階調範囲指定情報を説明するためのグラフである。(A)-(c) are the graphs for demonstrating the gradation range designation | designated information used in Embodiment 1. FIG. （ａ）～（ｃ）は、実施形態１の具体例１における変換関数を説明するためのグラフである。(A)-(c) is a graph for demonstrating the conversion function in the specific example 1 of Embodiment 1. FIG. （ａ）～（ｃ）は、実施形態１の具体例２における変換関数を説明するためのグラフである。(A)-(c) is a graph for demonstrating the conversion function in the specific example 2 of Embodiment 1. FIG. （ａ）～（ｃ）は、実施形態１の具体例３における変換関数を説明するためのグラフである。(A)-(c) is a graph for demonstrating the conversion function in the specific example 3 of Embodiment 1. FIG. （ａ）～（ｃ）は、実施形態１の具体例４における変換関数を説明するためのグラフである。(A)-(c) is a graph for demonstrating the conversion function in the specific example 4 of Embodiment 1. FIG. 本発明の実施形態２に係る表示装置の構成を示すブロック図である。It is a block diagram which shows the structure of the display apparatus which concerns on Embodiment 2 of this invention. 本発明の実施形態２に係る輝度変換方法を説明するフローチャートである。It is a flowchart explaining the brightness | luminance conversion method which concerns on Embodiment 2 of this invention. 本発明の実施形態３に係る送受信システムの構成を示すブロック図である。It is a block diagram which shows the structure of the transmission / reception system which concerns on Embodiment 3 of this invention. 本発明の実施形態３に係る映像信号生成方法を説明するフローチャートである。It is a flowchart explaining the video signal generation method which concerns on Embodiment 3 of this invention.
　以下、本発明の実施形態について、詳細に説明する。ただし、本実施形態に記載されている構成は、特に特定的な記載がない限り、この発明の範囲をそれのみに限定する趣旨ではなく、単なる説明例に過ぎない。 Hereinafter, embodiments of the present invention will be described in detail. However, unless otherwise specified, the configuration described in the present embodiment is merely an illustrative example, and is not intended to limit the scope of the present invention.
　〔実施形態１〕
　（表示装置１）
　本実施形態に係る表示装置１（請求項における受信装置に相当）について、図１及び２を参照して詳細に説明する。図１は、本実施形態に係る表示装置１の構成を示すブロック図である。また、図２は、表示装置１を備えているテレビジョン受像機１００の外観を示すブロック図である。図１が示すように、表示装置１は、受信部２、処理部３及び表示部４を備えている。 Embodiment 1
(Display device 1)
A display device 1 (corresponding to a receiving device in claims) according to the present embodiment will be described in detail with reference to FIGS. FIG. 1 is a block diagram illustrating a configuration of a display device 1 according to the present embodiment. FIG. 2 is a block diagram showing an appearance of the television receiver 100 including the display device 1. As shown in FIG. 1, the display device 1 includes a receiving unit 2, a processing unit 3, and a display unit 4.
　受信部２は、映像データを含む放送波を受信する。 The receiving unit 2 receives a broadcast wave including video data.
　処理部３は、受信部２が受信した映像データが示す映像に関し、階調特性を調整する階調範囲を指定する階調範囲指定情報を取得し、当該階調範囲指定情報を参照して、映像データが示す映像の輝度変換を行う。 The processing unit 3 acquires tone range designation information for designating a tone range for adjusting the tone characteristics for the video indicated by the video data received by the receiving unit 2, and refers to the tone range designation information, Brightness conversion of the video indicated by the video data is performed.
　表示部４は、処理部３による輝度変換後の輝度で、映像データを表示する。表示部４の例として、液晶ディスプレイ、有機ＥＬディスプレイ、プラズマディスプレイ及びＬＥＤディスプレイ等が挙げられる。 The display unit 4 displays the video data with the luminance after the luminance conversion by the processing unit 3. Examples of the display unit 4 include a liquid crystal display, an organic EL display, a plasma display, and an LED display.
　（処理部３）
　以下で、処理部３について詳細に説明する。図１が示すように、処理部３は、復調部５、暗号復号部６、逆多重化部７、映像信号復号化部８、音声信号復号化部９、読出部１０（請求項における取得部に相当）、切替部１１、変換部１２、及び表示制御部１３を備えている。 (Processing unit 3)
Hereinafter, the processing unit 3 will be described in detail. As shown in FIG. 1, the processing unit 3 includes a demodulation unit 5, an encryption / decryption unit 6, a demultiplexing unit 7, a video signal decoding unit 8, an audio signal decoding unit 9, and a reading unit 10 (acquiring unit in claims). ), A switching unit 11, a conversion unit 12, and a display control unit 13.
　復調部５は、受信部２が受信した放送信号を復調処理する。 The demodulator 5 demodulates the broadcast signal received by the receiver 2.
　暗号復号部６は、復調部５が復調した放送信号を復号する。 The encryption / decryption unit 6 decrypts the broadcast signal demodulated by the demodulation unit 5.
　逆多重化部７は、暗号復号部６が復号した放送信号を、映像信号（映像データ）と音声信号とメタデータとに逆多重化する。なお、本実施形態における映像信号は、ＨＤＲ映像信号であることが好ましいが、特に限定はない。 The demultiplexing unit 7 demultiplexes the broadcast signal decoded by the encryption / decryption unit 6 into a video signal (video data), an audio signal, and metadata. Note that the video signal in the present embodiment is preferably an HDR video signal, but there is no particular limitation.
　映像信号復号化部８は、逆多重化部７が逆多重化により分離した映像信号を復号化する。 The video signal decoding unit 8 decodes the video signal separated by the demultiplexing unit 7 by demultiplexing.
　音声信号復号化部９は、逆多重化部７が逆多重化により分離した音声信号を復号化する。 The audio signal decoding unit 9 decodes the audio signal separated by the demultiplexing unit 7 by demultiplexing.
　読出部１０は、映像信号復号化部８が復号化した映像信号が示す映像に関し、階調特性を調整する階調範囲を指定する階調範囲指定情報を、逆多重化部７が逆多重化により分離したメタデータから読み出す。なお、階調範囲指定情報の詳細については後述する。 The reading unit 10 includes a tone range designation information that designates a tone range for adjusting tone characteristics, and a demultiplexing unit 7 demultiplexes the video indicated by the video signal decoded by the video signal decoding unit 8. Read from the separated metadata. Details of the gradation range designation information will be described later.
　切替部１１は、読出部１０が読み出した階調範囲指定情報を参照して、映像信号が含む階調値を輝度値に変換する変換関数を切り替える。 The switching unit 11 refers to the gradation range designation information read by the reading unit 10 and switches a conversion function for converting the gradation value included in the video signal into a luminance value.
　変換部１２は、切替部１１が切り替えた変換関数を用いて、映像信号復号化部８が復号化した映像信号が含む階調値を輝度値に変換する。 The conversion unit 12 converts the gradation value included in the video signal decoded by the video signal decoding unit 8 into a luminance value using the conversion function switched by the switching unit 11.
　表示制御部１３は、変換部１２が変換した輝度値で表示部４が映像を表示するように表示部４を制御する。 The display control unit 13 controls the display unit 4 so that the display unit 4 displays an image with the luminance value converted by the conversion unit 12.
　（表示装置１による輝度変換方法）
　本実施形態に係る表示装置１により実行される輝度変換方法の流れを、図３を参照して説明する。図３は、表示装置１の輝度変換方法の流れを示すフローチャートである。 (Brightness conversion method by display device 1)
The flow of the luminance conversion method executed by the display device 1 according to the present embodiment will be described with reference to FIG. FIG. 3 is a flowchart showing the flow of the luminance conversion method of the display device 1.
　まず、受信部２は、映像データを含む放送波を受信する（ステップＳ０）。 First, the receiving unit 2 receives a broadcast wave including video data (step S0).
　次に、復調部５は、受信部２が受信した放送信号を復調処理する（ステップＳ１）。 Next, the demodulator 5 demodulates the broadcast signal received by the receiver 2 (step S1).
　次に、暗号復号部６は、復調部５が復調した放送信号を復号する（ステップＳ２）。 Next, the encryption / decryption unit 6 decrypts the broadcast signal demodulated by the demodulation unit 5 (step S2).
　次に、逆多重化部７は、暗号復号部６が復号した放送信号を、映像信号（映像データ）と音声信号とメタデータとに逆多重化する（ステップＳ３）。 Next, the demultiplexing unit 7 demultiplexes the broadcast signal decoded by the encryption / decryption unit 6 into a video signal (video data), an audio signal, and metadata (step S3).
　次に、映像信号復号化部８は、逆多重化部７が逆多重化により分離した映像信号を復号化する（ステップＳ４）。 Next, the video signal decoding unit 8 decodes the video signal separated by the demultiplexing unit 7 by demultiplexing (step S4).
　次に、読出部１０は、映像信号復号化部８が復号化した映像信号が示す映像に関し、階調特性を調整する階調範囲を指定する階調範囲指定情報を、逆多重化部７が逆多重化により分離したメタデータから読み出す（ステップＳ５）。読出部１０が読み出す階調範囲指定情報は、階調値を輝度値に変換する際に、他の階調範囲とは異なる変換を行う階調範囲を指定する情報であり得る。情報階調範囲指定情報の例として、映像信号が含む階調値の階調範囲におけるセンター値、下限値及び上限値等が挙げられる。 Next, in the reading unit 10, regarding the video indicated by the video signal decoded by the video signal decoding unit 8, gradation range designation information for designating a gradation range for adjusting the gradation characteristics is received by the demultiplexing unit 7. Read from the metadata separated by demultiplexing (step S5). The gradation range designation information read by the reading unit 10 may be information that designates a gradation range that is converted differently from the other gradation ranges when the gradation value is converted into a luminance value. Examples of the information gradation range designation information include a center value, a lower limit value, and an upper limit value in the gradation range of gradation values included in the video signal.
　ステップＳ５の次の工程として、切替部１１は、読出部１０が読み出した階調範囲指定情報を参照して、映像信号が含む階調値を輝度値に変換する変換関数を切り替える（ステップＳ６）。なお、本実施形態では、切替部１１は、変換関数を切り替えるが、変換関数の代わりに、階調値から輝度値を設定するために階調値と輝度値との対応を示すテーブルを切り替えてもよい。 As the next step of step S5, the switching unit 11 switches the conversion function for converting the gradation value included in the video signal into the luminance value with reference to the gradation range designation information read by the reading unit 10 (step S6). . In this embodiment, the switching unit 11 switches the conversion function. Instead of the conversion function, the switching unit 11 switches the table indicating the correspondence between the gradation value and the luminance value in order to set the luminance value from the gradation value. Also good.
　次に、変換部１２は、切替部１１が切り替えた変換関数を用いて、映像信号復号化部８が復号化した映像信号が含む階調値を輝度値に変換する（ステップＳ７）。なお、上述のように、切替部１１がテーブルを切り替える構成では、変換部１２は、当該テーブルを用いて、階調値を輝度値に変換してもよい。 Next, the conversion unit 12 converts the gradation value included in the video signal decoded by the video signal decoding unit 8 into a luminance value using the conversion function switched by the switching unit 11 (step S7). As described above, in the configuration in which the switching unit 11 switches the table, the conversion unit 12 may convert the gradation value into the luminance value using the table.
　次に、表示制御部１３は、変換部１２が変換した輝度値で表示部４が映像を表示するように表示部４を制御する（ステップＳ８）。 Next, the display control unit 13 controls the display unit 4 so that the display unit 4 displays an image with the luminance value converted by the conversion unit 12 (step S8).
　（実施形態１の具体例）
　以下で、実施形態１に係る表示装置１による輝度変換方法の具体例を、図４～８を参照して説明する。図４の（ａ）～（ｃ）は、上述の階調範囲指定情報を説明するためのグラフであり、横軸は、変換関数を用いて変換する前の階調値であり、縦軸は、変換した後の輝度値である。 (Specific example of Embodiment 1)
Hereinafter, a specific example of the luminance conversion method by the display device 1 according to the first embodiment will be described with reference to FIGS. 4A to 4C are graphs for explaining the above-described gradation range designation information, in which the horizontal axis represents gradation values before conversion using a conversion function, and the vertical axis represents The luminance value after conversion.
　図４の（ａ）の点線は、ＨＤＲ映像信号が含む階調値を圧縮せずに輝度値に変換した場合のグラフである。図４の（ａ）の実線は、このような階調値を、ディスプレイが表示可能な輝度範囲に合わせるように圧縮して輝度値に変換した場合のグラフである。図４の（ａ）の点線と実線とが示すように、圧縮によって、階調値１２８付近の中間階調範囲に対応する輝度値が低下していることが確認できる。このように低下した輝度値で映像を表示すると、映像の作成者の意図が反映された輝度で映像を表示することができない。そこで、本実施形態に係る表示装置１では、上述の階調範囲指定情報を参照して、階調値を輝度値に変換する。 4A is a graph when the gradation value included in the HDR video signal is converted into a luminance value without being compressed. The solid line in FIG. 4A is a graph when such a gradation value is compressed and converted into a luminance value so as to match the luminance range that can be displayed on the display. As indicated by the dotted line and the solid line in FIG. 4A, it can be confirmed that the luminance value corresponding to the intermediate gradation range near the gradation value 128 is reduced by the compression. When a video is displayed with such a reduced luminance value, the video cannot be displayed with a luminance that reflects the intention of the creator of the video. Therefore, in the display device 1 according to the present embodiment, the gradation value is converted into a luminance value with reference to the above-described gradation range designation information.
　階調範囲指定情報の例として、指定する階調範囲の下限値を示すＦｉｔ＿ｌｏｗ（見えやすくしたい階調の下限）と上限値を示すＦｉｔ＿ｈｉｇｈ（見えやすくしたい階調の上限）が挙げられる。図４の（ｂ）が示す階調値１２０がＦｉｔ＿ｌｏｗに相当し、階調値１４０がＦｉｔ＿ｈｉｇｈに相当する。また、図４の（ｃ）が示す階調値８０がＦｉｔ＿ｌｏｗに相当し、階調値１００がＦｉｔ＿ｈｉｇｈに相当する。本実施形態に係る表示装置１では、ステップＳ６において、このような階調範囲を参照することにより、階調値を輝度値に変換する変換関数を切り替える。なお、切替部１１が切り替える変換関数は、階調範囲指定情報のみではなく、表示部４が表示可能な輝度範囲にも依存する。 Examples of gradation range designation information include Fit_low (lower limit of gradation to be easily visible) indicating the lower limit value of the specified gradation range and Fit_high (upper limit of gradation to be easily visible) indicating the upper limit value. The gradation value 120 shown in FIG. 4B corresponds to Fit_low, and the gradation value 140 corresponds to Fit_high. Also, the gradation value 80 shown in FIG. 4C corresponds to Fit_low, and the gradation value 100 corresponds to Fit_high. In the display device 1 according to the present embodiment, in step S6, the conversion function for converting the gradation value into the luminance value is switched by referring to such a gradation range. Note that the conversion function switched by the switching unit 11 depends not only on the gradation range designation information but also on the luminance range that the display unit 4 can display.
　（具体例１）
　以下で、切替部１１が階調範囲指定情報を参照して切り替える変換関数の具体例１を示す。図５の（ａ）～（ｃ）は、切替部１１が階調範囲指定情報を参照して切り替える変換関数を説明するためのグラフであり、横軸は、変換関数を用いて変換する前の階調値であり、縦軸は、変換した後の輝度値である。図５の（ａ）～（ｃ）において、輝度Ｌ１から輝度Ｌ２の範囲Ａは、表示部４が表示可能な輝度範囲であり、階調値Ｓ１は、階調範囲指定情報が指定する階調範囲の下限値であり、階調値Ｓ２は、階調範囲指定情報が指定する階調範囲の上限値である。 (Specific example 1)
A specific example 1 of the conversion function that the switching unit 11 switches with reference to the gradation range designation information will be described below. (A) to (c) of FIG. 5 are graphs for explaining a conversion function that the switching unit 11 switches with reference to the gradation range designation information, and the horizontal axis represents a level before conversion using the conversion function. It is a gradation value, and the vertical axis is a luminance value after conversion. In FIGS. 5A to 5C, a range A from luminance L1 to luminance L2 is a luminance range that can be displayed by the display unit 4, and a gradation value S1 is a gradation specified by the gradation range designation information. The lower limit value of the range, and the gradation value S2 is an upper limit value of the gradation range specified by the gradation range specification information.
　図５の（ａ）において、点線は、階調値を圧縮せずに輝度値に変換した場合のグラフである。表示可能な輝度範囲が範囲Ａである表示部４が、点線で示される輝度値で映像を表示すると、実線で示される輝度値しか表示できない。そのため、高階調側の階調と低階調側の階調とが潰れてしまい表現できない。また、図５の（ｂ）が示す実線のように、表示部４が表示可能な輝度範囲Ａに合うように、階調値を圧縮して輝度値に変換すると、階調値Ｓ１から階調値Ｓ２の階調範囲において、変換後の輝度値が低下してしまう。 In FIG. 5A, the dotted line is a graph when the gradation value is converted into a luminance value without being compressed. When the display unit 4 whose displayable luminance range is the range A displays an image with the luminance value indicated by the dotted line, only the luminance value indicated by the solid line can be displayed. Therefore, the gradation on the high gradation side and the gradation on the low gradation side are crushed and cannot be expressed. Further, as shown by the solid line in FIG. 5B, when the gradation value is compressed and converted into the luminance value so as to fit the luminance range A that can be displayed by the display unit 4, the gradation value S1 is changed to the gradation value. In the gradation range of the value S2, the luminance value after conversion is lowered.
　そこで、本実施形態に係る表示装置１では、ステップＳ６において切替部１１が階調範囲指定情報（階調値Ｓ１から階調値Ｓ２の階調範囲）を参照して変換関数を切り替える。図５の（ｃ）の実線は、ステップＳ７において変換部１２が、ステップＳ６において切替部１１が切り替えた変換関数を用いて変換する前の階調値（横軸）と変換した後の輝度値（縦軸）とのグラフである。当該変換関数は、階調値Ｓ１から階調値Ｓ２の階調範囲において、映像信号を生成する際に用いられたＯＥＴＦ関数の逆関数と同じＥＯＴＦ関数である。 Therefore, in the display device 1 according to the present embodiment, in step S6, the switching unit 11 switches the conversion function with reference to the gradation range designation information (the gradation range from the gradation value S1 to the gradation value S2). The solid line in (c) of FIG. 5 indicates the luminance value after conversion by the conversion unit 12 in step S7 using the conversion function switched by the switching unit 11 in step S6 and the gradation value (horizontal axis) before conversion. It is a graph with (vertical axis). The conversion function is the same EOTF function as the inverse function of the OETF function used when generating the video signal in the gradation range from the gradation value S1 to the gradation value S2.
　変換部１２がこのような変換関数を用いて階調値Ｓ１から階調値Ｓ２の階調範囲の階調値を輝度値に変換することにより、階調値Ｓ１から階調値Ｓ２の階調範囲に対応する輝度範囲において、表示部４が変換後の輝度値で表示した映像は、映像の作成者の意図が反映された映像となる。 The conversion unit 12 converts the gradation value in the gradation range from the gradation value S1 to the gradation value S2 into the luminance value using such a conversion function, so that the gradation value from the gradation value S1 to the gradation value S2 is obtained. In the luminance range corresponding to the range, the video displayed by the display unit 4 with the converted luminance value is a video reflecting the intention of the video creator.
　なお、階調値Ｓ１から階調値Ｓ２の階調範囲以外の階調範囲における変換関数は、変換前の階調値と変換後の輝度値とのグラフにおいて、表示部４が表示可能な輝度の下限値Ｌ１に対応する階調値から、階調値Ｓ１までの範囲のガンマ曲線と、階調値Ｓ２から、表示部４が表示可能な輝度の上限値Ｌ２に対応する階調値までの範囲のガンマ曲線とが、それぞれ、階調値Ｓ１から階調値Ｓ２の階調範囲のガンマ曲線とＳ１及びＳ２において連続して繋がるように階調値を輝度値に変換する変換関数であることが好ましい。 Note that the conversion function in the gradation range other than the gradation range from the gradation value S1 to the gradation value S2 is the luminance that can be displayed by the display unit 4 in the graph of the gradation value before conversion and the luminance value after conversion. The gradation value corresponding to the lower limit value L1 to the gradation value S1 and the gradation value S2 to the gradation value corresponding to the upper limit value L2 of the luminance that can be displayed by the display unit 4. The gamma curve of the range is a conversion function that converts the gradation value into a luminance value so as to be continuously connected to the gamma curve of the gradation range from the gradation value S1 to the gradation value S2 in S1 and S2. Is preferred.
　（具体例２）
　以下で、切替部１１が階調範囲指定情報を参照して切り替える変換関数の具体例２を示す。図６の（ａ）～（ｃ）は、切替部１１が階調範囲指定情報を参照して切り替える変換関数を説明するためのグラフであり、横軸は、変換関数を用いて変換する前の階調値であり、縦軸は、変換した後の輝度値である。図６の（ａ）～（ｃ）において、輝度Ｌ３から輝度Ｌ４の範囲Ｂは、表示部４が表示可能な輝度範囲であり、階調値Ｓ３は、階調範囲指定情報が指定する階調範囲の下限値であり、階調値Ｓ４は、階調範囲指定情報が指定する階調範囲の上限値である。 (Specific example 2)
Below, the specific example 2 of the conversion function which the switching part 11 switches with reference to gradation range designation | designated information is shown. FIGS. 6A to 6C are graphs for explaining a conversion function that the switching unit 11 switches with reference to the gradation range designation information, and the horizontal axis represents a level before conversion using the conversion function. It is a gradation value, and the vertical axis is a luminance value after conversion. In FIGS. 6A to 6C, a range B from luminance L3 to luminance L4 is a luminance range that can be displayed by the display unit 4, and a gradation value S3 is a gradation specified by the gradation range designation information. The gradation value S4 is the lower limit value of the range, and the gradation value S4 is the upper limit value of the gradation range specified by the gradation range designation information.
　図６の（ａ）において、点線は、階調値を圧縮せずに輝度値に変換した場合のグラフである。表示可能な輝度範囲が範囲Ｂである表示部４が、点線で示される輝度値で映像を表示すると、実線で示される輝度値しか表示できない。そのため、高階調側の階調と低階調側の階調とが潰れてしまい表現できない。また、図６の（ｂ）が示す実線のように、表示部４が表示可能な輝度範囲Ｂに合うように、階調値を圧縮して輝度値に変換すると、階調値Ｓ３から階調値Ｓ４の階調範囲において、低階調側の変換後の輝度値が高くなってしまう。 6A, the dotted line is a graph when the gradation value is converted into a luminance value without being compressed. When the display unit 4 whose displayable luminance range is the range B displays an image with the luminance value indicated by the dotted line, only the luminance value indicated by the solid line can be displayed. Therefore, the gradation on the high gradation side and the gradation on the low gradation side are crushed and cannot be expressed. Further, as shown by the solid line in FIG. 6B, when the gradation value is compressed and converted into the luminance value so as to fit the luminance range B that can be displayed by the display unit 4, the gradation value S3 is changed to the gradation value. In the gradation range of the value S4, the luminance value after conversion on the low gradation side becomes high.
　そこで、本実施形態に係る表示装置１では、ステップＳ６において切替部１１が階調範囲指定情報（階調値Ｓ３から階調値Ｓ４の階調範囲）を参照して変換関数を切り替える。図６の（ｃ）の実線は、ステップＳ７において変換部１２が、ステップＳ６において切替部１１が切り替えた変換関数を用いて変換する前の階調値（横軸）と変換した後の輝度値（縦軸）とのグラフである。当該変換関数は、階調値Ｓ３から階調値Ｓ４の階調範囲において、映像信号を生成する際に用いられたＯＥＴＦ関数の逆関数にオフセットを付加して得られるＥＯＴＦ関数である。 Therefore, in the display device 1 according to the present embodiment, in step S6, the switching unit 11 switches the conversion function with reference to the gradation range designation information (the gradation range from the gradation value S3 to the gradation value S4). The solid line in FIG. 6C indicates the luminance value after the conversion by the conversion unit 12 in step S7 before conversion using the conversion function switched by the switching unit 11 in step S6 (horizontal axis). It is a graph with (vertical axis). The conversion function is an EOTF function obtained by adding an offset to the inverse function of the OETF function used when generating the video signal in the gradation range from the gradation value S3 to the gradation value S4.
　変換部１２がこのような変換関数を用いて階調値Ｓ１から階調値Ｓ２の階調範囲の階調値を輝度値に変換することにより、変換前の階調値と変換後の輝度値とのグラフにおいて、階調値Ｓ３から階調値Ｓ４の階調範囲のガンマ曲線の傾きは、階調値を圧縮せずに輝度値に変換した場合のガンマ曲線の傾きと同等になる。これにより、表示部４が変換後の輝度値で表示した映像は、映像の製作者が意図する階調を表現した映像となる。 The conversion unit 12 converts the gradation value in the gradation range from the gradation value S1 to the gradation value S2 into a luminance value using such a conversion function, so that the gradation value before conversion and the luminance value after conversion are converted. In the graph, the slope of the gamma curve in the gradation range from the gradation value S3 to the gradation value S4 is equivalent to the inclination of the gamma curve when the gradation value is converted into a luminance value without being compressed. As a result, the video displayed by the display unit 4 with the converted luminance value becomes a video expressing the gradation intended by the video producer.
　なお、階調値Ｓ３から階調値Ｓ４の階調範囲以外の階調範囲における変換関数は、変換前の階調値と変換後の輝度値とのグラフにおいて、表示部４が表示可能な輝度の下限値Ｌ３に対応する階調値から、階調値Ｓ３までの範囲のガンマ曲線と、階調値Ｓ４から、表示部４が表示可能な輝度の上限値Ｌ４に対応する階調値までの範囲のガンマ曲線とが、それぞれ、階調値Ｓ３から階調値Ｓ４の階調範囲のガンマ曲線とＳ３及びＳ４において連続して繋がるように階調値を輝度値に変換する変換関数であることが好ましい。 Note that the conversion function in the gradation range other than the gradation range from the gradation value S3 to the gradation value S4 is the luminance that can be displayed by the display unit 4 in the graph of the gradation value before conversion and the luminance value after conversion. The gamma curve in the range from the gradation value corresponding to the lower limit value L3 to the gradation value S3, and from the gradation value S4 to the gradation value corresponding to the upper limit value L4 of the luminance that can be displayed by the display unit 4. The gamma curve of the range is a conversion function that converts the gradation value into a luminance value so as to be continuously connected to the gamma curve of the gradation range from the gradation value S3 to the gradation value S4 in S3 and S4, respectively. Is preferred.
　（具体例３）
　以下で、切替部１１ が階調範囲指定情報を参照して切り替える変換関数の具体例３を示す。図７の（ａ）～（ｃ）は、切替部１１が階調範囲指定情報を参照して切り替える変換関数を説明するためのグラフであり、横軸は、変換関数を用いて変換する前の階調値であり、縦軸は、変換した後の輝度値である。図７の（ａ）～（ｃ）において、輝度Ｌ５から輝度Ｌ６の範囲Ｃは、表示部４が表示可能な輝度範囲であり、階調値Ｓ５は、階調範囲指定情報が指定する階調範囲の下限値であり、階調値Ｓ６は、階調範囲指定情報が指定する階調範囲の上限値である。 (Specific example 3)
Hereinafter, specific example 3 of the conversion function that the switching unit 11 switches with reference to the gradation range designation information will be described. (A) to (c) of FIG. 7 are graphs for explaining the conversion function that the switching unit 11 switches with reference to the gradation range designation information, and the horizontal axis represents the level before conversion using the conversion function. It is a gradation value, and the vertical axis is a luminance value after conversion. In FIGS. 7A to 7C, a range C from luminance L5 to luminance L6 is a luminance range that can be displayed by the display unit 4, and a gradation value S5 is a gradation specified by the gradation range designation information. This is the lower limit value of the range, and the tone value S6 is the upper limit value of the tone range designated by the tone range designation information.
　図７の（ａ）において、点線は、階調値を圧縮せずに輝度値に変換した場合のグラフである。表示可能な輝度範囲が範囲Ｃである表示部４が、点線で示される輝度値で映像を表示すると、実線で示される輝度値しか表示できない。そのため、高階調側の階調と低階調側の階調とが潰れてしまい表現できない。また、図７の（ｂ）が示す実線のように、表示部４が表示可能な輝度範囲Ｃに合うように、階調値を圧縮して輝度値に変換すると、階調値Ｓ５から階調値Ｓ６の階調範囲において、変換後の輝度値が低下してしまう。 7 (a), the dotted line is a graph when the gradation value is converted into a luminance value without being compressed. When the display unit 4 whose displayable luminance range is the range C displays an image with the luminance value indicated by the dotted line, only the luminance value indicated by the solid line can be displayed. Therefore, the gradation on the high gradation side and the gradation on the low gradation side are crushed and cannot be expressed. Further, as shown by the solid line in FIG. 7B, when the gradation value is compressed and converted into the luminance value so as to fit the luminance range C that can be displayed by the display unit 4, the gradation value S5 is changed to the gradation value. In the gradation range of value S6, the luminance value after conversion is lowered.
　そこで、本実施形態に係る表示装置１では、ステップＳ６において切替部１１が階調範囲指定情報（階調値Ｓ５から階調値Ｓ６の階調範囲）を参照して変換関数を切り替える。図７の（ｃ）の実線は、ステップＳ７において変換部１２が、ステップＳ６において切替部１１が切り替えた変換関数を用いて変換する前の階調値（横軸）と変換した後の輝度値（縦軸）とのグラフである。当該変換関数は、階調値Ｓ５から階調値Ｓ６の階調範囲に対応する輝度値が階調範囲指定情報を参照しない場合の輝度値よりも向上するように、階調値を輝度値に変換する変換関数である。結果的に、変換前の階調値と変換後の輝度値とのグラフにおいて、ガンマ曲線を中間輝度側にずらす変換関数である。 Therefore, in the display device 1 according to the present embodiment, in step S6, the switching unit 11 switches the conversion function with reference to the gradation range designation information (the gradation range from the gradation value S5 to the gradation value S6). The solid line in (c) of FIG. 7 indicates the luminance value after conversion by the conversion unit 12 in step S7 using the conversion function switched by the switching unit 11 in step S6 and the gradation value (horizontal axis) before conversion. It is a graph with (vertical axis). The conversion function converts the gradation value into the luminance value so that the luminance value corresponding to the gradation range from the gradation value S5 to the gradation value S6 is higher than the luminance value when the gradation range designation information is not referred to. Conversion function to convert. As a result, this is a conversion function for shifting the gamma curve to the intermediate luminance side in the graph of the gradation value before conversion and the luminance value after conversion.
　変換部１２がこのような変換関数を用いて階調値を輝度値に変換することにより、表示部４が変換後の輝度値で表示した映像は、階調値を圧縮せずに変換した場合の輝度値で表示した映像と同様の階調で表現された映像となる。 When the conversion unit 12 converts the gradation value into the luminance value using such a conversion function, the video displayed by the display unit 4 with the converted luminance value is converted without compressing the gradation value. The image is expressed with the same gradation as the image displayed with the luminance value.
　なお、本具体例における輝度変換方法によって変換した階調値と輝度値とが示す階調特性は、圧縮せずに変換した階調値と輝度値とが示す階調特性と異なっていてもよい。 Note that the gradation characteristic indicated by the gradation value and the luminance value converted by the luminance conversion method in this specific example may be different from the gradation characteristic indicated by the gradation value and the luminance value converted without compression. .
　また、階調値Ｓ５から階調値Ｓ６の階調範囲以外の階調範囲における変換関数は、変換前の階調値と変換後の輝度値とのグラフにおいて、表示部４が表示可能な輝度の下限値Ｌ５に対応する階調値から、階調値Ｓ５までの範囲のガンマ曲線と、階調値Ｓ６から、表示部４が表示可能な輝度の上限値Ｌ６に対応する階調値までの範囲のガンマ曲線とが、それぞれ、階調値Ｓ５から階調値Ｓ６の階調範囲のガンマ曲線とＳ５及びＳ６において連続して繋がるように階調値を輝度値に変換する変換関数であることが好ましい。 Further, the conversion function in the gradation range other than the gradation range from the gradation value S5 to the gradation value S6 is a luminance that can be displayed by the display unit 4 in the graph of the gradation value before the conversion and the luminance value after the conversion. The gradation value corresponding to the lower limit value L5 to the gradation value S5, and the gradation value S6 to the gradation value corresponding to the luminance upper limit value L6 that the display unit 4 can display. The gamma curve in the range is a conversion function that converts the gradation value into a luminance value so as to be continuously connected to the gamma curve in the gradation range from the gradation value S5 to the gradation value S6 in S5 and S6. Is preferred.
　（具体例４）
　以下で、切替部１１ が階調範囲指定情報を参照して切り替える変換関数の具体例４を示す。図８の（ａ）～（ｃ）は、切替部１１が階調範囲指定情報を参照して切り替える変換関数を説明するためのグラフであり、横軸は、変換関数を用いて変換する前の階調値であり、縦軸は、変換した後の輝度値である。図８の（ａ）～（ｃ）において、輝度Ｌ７から輝度Ｌ８の範囲Ｄは、表示部４が表示可能な輝度範囲であり、階調値Ｓ７は、階調範囲指定情報が指定する階調範囲の下限値であり、階調値Ｓ８は、階調範囲指定情報が指定する階調範囲の上限値である。 (Specific example 4)
Hereinafter, specific example 4 of the conversion function that the switching unit 11 switches with reference to the gradation range designation information will be described. (A) to (c) of FIG. 8 are graphs for explaining the conversion function that the switching unit 11 switches with reference to the gradation range designation information, and the horizontal axis represents the level before conversion using the conversion function. It is a gradation value, and the vertical axis is a luminance value after conversion. 8A to 8C, a range D from luminance L7 to luminance L8 is a luminance range that can be displayed by the display unit 4, and a gradation value S7 is a gradation specified by the gradation range designation information. The lower limit value of the range, and the gradation value S8 is the upper limit value of the gradation range specified by the gradation range specification information.
　図８の（ａ）において、点線は、階調値を圧縮せずに輝度値に変換した場合のグラフである。表示可能な輝度範囲が範囲Ｄである表示部４が、点線で示される輝度値で映像を表示すると、実線で示される輝度値しか表示できない。そのため、高階調側の階調と低階調側の階調とが潰れてしまい表現できない。また、図８の（ｂ）が示す実線のように、表示部４が表示可能な輝度範囲Ｄに合うように、階調値を圧縮して輝度値に変換すると、階調値Ｓ７から階調値Ｓ８の階調範囲において、変換後の輝度値が低下してしまう。 8A, the dotted line is a graph when the gradation value is converted into a luminance value without being compressed. When the display unit 4 whose displayable luminance range is the range D displays an image with the luminance value indicated by the dotted line, only the luminance value indicated by the solid line can be displayed. Therefore, the gradation on the high gradation side and the gradation on the low gradation side are crushed and cannot be expressed. Further, as shown by the solid line in FIG. 8B, when the gradation value is compressed and converted into a luminance value so as to fit the luminance range D that can be displayed by the display unit 4, the gradation value S7 is changed to the gradation value. In the gradation range of value S8, the luminance value after conversion is lowered.
　そこで、本実施形態に係る表示装置１では、ステップＳ６において切替部１１が階調範囲指定情報（階調値Ｓ７から階調値Ｓ８の階調範囲）を参照して変換関数を切り替える。図８の（ｃ）の実線は、ステップＳ７において変換部１２が、ステップＳ６において切替部１１が切り替えた変換関数を用いて変換する前の階調値（横軸）と変換した後の輝度値（縦軸）とのグラフである。当該変換関数は、階調値Ｓ７から階調値Ｓ８の階調範囲において、映像信号を生成する際に用いられたＯＥＴＦ関数の逆関数よりも傾きの大きいＥＯＴＦ関数である。結果的に、当該変換関数を用いて変換する前の階調値と変換後の輝度値とのグラフにおいて、ガンマ曲線を、輝度値の軸方向に伸ばす変換関数である。 Therefore, in the display device 1 according to the present embodiment, in step S6, the switching unit 11 switches the conversion function with reference to the gradation range designation information (the gradation range from the gradation value S7 to the gradation value S8). The solid line in (c) of FIG. 8 indicates the luminance value after conversion by the conversion unit 12 in step S7 using the conversion function switched by the switching unit 11 in step S6 and the gradation value (horizontal axis) before conversion. It is a graph with (vertical axis). The conversion function is an EOTF function having a larger slope than the inverse function of the OETF function used when generating the video signal in the gradation range from the gradation value S7 to the gradation value S8. As a result, in the graph of the gradation value before conversion using the conversion function and the luminance value after conversion, this is a conversion function for extending the gamma curve in the axial direction of the luminance value.
　変換部１２がこのような変換関数を用いて階調値を輝度値に変換することにより、表示部４が変換後の輝度値で表示した映像は、階調値を圧縮せずに変換した場合の輝度値で表示した映像と同様の階調で表現された映像となる。 When the conversion unit 12 converts the gradation value into the luminance value using such a conversion function, the video displayed by the display unit 4 with the converted luminance value is converted without compressing the gradation value. The image is expressed with the same gradation as the image displayed with the luminance value.
　なお、階調値Ｓ７から階調値Ｓ８の階調範囲以外の階調範囲における変換関数は、変換前の階調値と変換後の輝度値とのグラフにおいて、表示部４が表示可能な輝度の下限値Ｌ７に対応する階調値から、階調値Ｓ７までの範囲のガンマ曲線と、階調値Ｓ８から、表示部４が表示可能な輝度の上限値Ｌ８に対応する階調値までの範囲のガンマ曲線とが、それぞれ、階調値Ｓ７から階調値Ｓ８の階調範囲のガンマ曲線とＳ７及びＳ８において連続して繋がるように階調値を輝度値に変換する変換関数であることが好ましい。 Note that the conversion function in the gradation range other than the gradation range from the gradation value S7 to the gradation value S8 is the luminance that can be displayed by the display unit 4 in the graph of the gradation value before conversion and the luminance value after conversion. The gradation value corresponding to the lower limit value L7 to the gradation value S7, and the gradation value S8 to the gradation value corresponding to the upper limit value L8 of the luminance that the display unit 4 can display. The gamma curve in the range is a conversion function that converts the gradation value into a luminance value so as to be continuously connected to the gamma curve in the gradation range from the gradation value S7 to the gradation value S8 in S7 and S8, respectively. Is preferred.
　（実施形態１のまとめ）
　以上のように、本実施形態に係る表示装置１は、映像データが示す映像に関し、階調特性を調整する階調範囲を指定する階調範囲指定情報を取得し、当該階調範囲指定情報を参照して、映像データが示す映像の輝度変換を行う。当該構成では、取得した階調範囲指定情報に基づいて映像の階調特性を調整することができる。これにより、映像の作成者が階調範囲を指定した階調範囲指定情報を用いることで、映像の作成者の意図が反映された輝度で映像を表示することができる。 (Summary of Embodiment 1)
As described above, the display device 1 according to the present embodiment acquires tone range designation information for designating a tone range for adjusting the tone characteristics for the video indicated by the video data, and stores the tone range designation information. Referring to, luminance conversion of the video indicated by the video data is performed. With this configuration, it is possible to adjust the tone characteristics of the video based on the acquired tone range designation information. As a result, by using the gradation range designation information in which the creator of the image has designated the gradation range, the image can be displayed with a luminance that reflects the intention of the creator of the image.
　また、本実施形態に係る表示装置１は、階調範囲指定情報を、映像信号に含まれるメタデータから取得する。これにより、受信した映像信号に含まれるメタデータから階調範囲指定情報を取得すればよいため、階調範囲指定情報を外部から取得するための部材が不要である。 In addition, the display device 1 according to the present embodiment acquires gradation range designation information from metadata included in the video signal. Thereby, since it is only necessary to acquire the gradation range designation information from the metadata included in the received video signal, a member for obtaining the gradation range designation information from the outside is unnecessary.
　〔実施形態２〕
　本発明の実施形態２について、図９及び図１０に基づいて説明すれば、以下のとおりである。なお、説明の便宜上、実施形態１にて説明した部材と同じ機能を有する部材については、同じ符号を付記し、その説明を省略する。 [Embodiment 2]
The second embodiment of the present invention will be described below with reference to FIGS. 9 and 10. For convenience of explanation, members having the same functions as those described in the first embodiment are denoted by the same reference numerals and description thereof is omitted.
　（表示装置２０）
　本実施形態に係る表示装置２０について、図９を参照して説明する。図９は、本実施形態に係る表示装置２０の構成を示すブロック図である。図９が示すように、表示装置２０は、実施形態１に係る表示装置１の構成に加えて、通信部２１をさらに備えている。 (Display device 20)
The display device 20 according to the present embodiment will be described with reference to FIG. FIG. 9 is a block diagram illustrating a configuration of the display device 20 according to the present embodiment. As illustrated in FIG. 9, the display device 20 further includes a communication unit 21 in addition to the configuration of the display device 1 according to the first embodiment.
　通信部２１は、階調特性を調整する階調範囲を指定する階調範囲指定情報を含むメタデータを、インターネットを介して受信する。 The communication unit 21 receives metadata including gradation range designation information that designates a gradation range for adjusting gradation characteristics via the Internet.
　（表示装置２０による輝度変換方法）
　本実施形態に係る表示装置２０により実行される輝度変換方法の流れを、図１０を参照して説明する。図１０は、表示装置２０により実行される輝度変換方法の流れを示すフローチャートである。なお、実施形態１において説明したステップと同様のステップについては、その説明を省略する。 (Luminance conversion method by display device 20)
The flow of the luminance conversion method executed by the display device 20 according to the present embodiment will be described with reference to FIG. FIG. 10 is a flowchart showing the flow of the luminance conversion method executed by the display device 20. Note that description of steps similar to those described in Embodiment 1 is omitted.
　まず、受信部２は、映像データを含む放送波を受信する（ステップＳ１０）。 First, the receiving unit 2 receives a broadcast wave including video data (step S10).
　次に、通信部２１は、階調特性を調整する階調範囲を指定する階調範囲指定情報を含むメタデータを、インターネットを介して受信する。 Next, the communication unit 21 receives metadata including gradation range designation information that designates a gradation range for adjusting gradation characteristics via the Internet.
　次に、復調部５は、受信部２が受信した放送信号を復調処理する（ステップＳ１２）。 Next, the demodulator 5 demodulates the broadcast signal received by the receiver 2 (step S12).
　次に、暗号復号部６は、復調部５が復調した放送信号を復号する（ステップＳ１３）。 Next, the encryption / decryption unit 6 decrypts the broadcast signal demodulated by the demodulation unit 5 (step S13).
　次に、逆多重化部７は、暗号復号部６が復号した放送信号を、映像信号（映像データ）と音声信号とに逆多重化する（ステップＳ１４）。 Next, the demultiplexing unit 7 demultiplexes the broadcast signal decoded by the encryption / decryption unit 6 into a video signal (video data) and an audio signal (step S14).
　次に、映像信号復号化部８は、逆多重化部７が逆多重化により分離した映像信号を復号化する（ステップＳ１５）。 Next, the video signal decoding unit 8 decodes the video signal separated by the demultiplexing unit 7 by demultiplexing (step S15).
　次に、読出部１０は、映像信号復号化部８が復号化した映像信号が示す映像に関し、階調特性を調整する階調範囲を指定する階調範囲指定情報を、通信部２１が受信したメタデータから読み出す（ステップＳ１６）。 Next, with respect to the video indicated by the video signal decoded by the video signal decoding unit 8, the reading unit 10 has received the gradation range designation information for designating the gradation range for adjusting the gradation characteristics, by the communication unit 21. Read from the metadata (step S16).
　次に、切替部１１は、読出部１０が読み出した階調範囲指定情報を参照して、映像信号が含む階調値を輝度値に変換する変換関数を切り替える（ステップＳ１７）。 Next, the switching unit 11 refers to the gradation range designation information read by the reading unit 10 and switches the conversion function for converting the gradation value included in the video signal into a luminance value (step S17).
　次に、変換部１２は、切替部１１が切り替えた変換関数を用いて、映像信号復号化部８が復号化した映像信号が含む階調値を輝度値に変換する（ステップＳ１８）。 Next, the conversion unit 12 converts the gradation value included in the video signal decoded by the video signal decoding unit 8 into a luminance value using the conversion function switched by the switching unit 11 (step S18).
　次に、表示制御部１３は、変換部１２が変換した輝度値で表示部４が映像を表示するように表示部４を制御する（ステップＳ１９）。 Next, the display control unit 13 controls the display unit 4 so that the display unit 4 displays an image with the luminance value converted by the conversion unit 12 (step S19).
　（実施形態２のまとめ）
　以上のように、本実施形態に係る表示装置２０は、階調特性を調整する階調範囲を指定する階調範囲指定情報を含むメタデータを、インターネットを介して受信し、当該階調範囲指定情報を参照して、映像データが示す映像の輝度変換を行う。これにより、実施形態１とは異なり、インターネットを介して階調範囲指定情報を取得した場合であっても、当該階調範囲指定情報に基づいて映像の階調特性を調整することができる。これにより、映像の作成者が階調範囲を指定した階調範囲指定情報を用いることで、映像の作成者の意図が反映された輝度で映像を表示することができる。 (Summary of Embodiment 2)
As described above, the display device 20 according to the present embodiment receives the metadata including the gradation range designation information for designating the gradation range for adjusting the gradation characteristics via the Internet, and specifies the gradation range designation. With reference to the information, the luminance of the video indicated by the video data is converted. Thereby, unlike the first embodiment, even when the gradation range designation information is acquired via the Internet, the gradation characteristics of the video can be adjusted based on the gradation range designation information. As a result, by using the gradation range designation information in which the creator of the image has designated the gradation range, the image can be displayed with a luminance that reflects the intention of the creator of the image.
　〔実施形態３〕
　本発明の実施形態３に係る送受信システム１０１について、図１１及び図１２に基づいて説明すれば、以下のとおりである。図１１は、本実施形態に係る送受信システム１０１の構成を示すブロック図である。図１１が示すように、送受信システム１０１は、送信装置３０、及び、実施形態１に係る表示装置１又は実施形態２に係る表示装置２０を含む。 [Embodiment 3]
The transmission / reception system 101 according to the third embodiment of the present invention is described below with reference to FIGS. 11 and 12. FIG. 11 is a block diagram illustrating a configuration of the transmission / reception system 101 according to the present embodiment. As illustrated in FIG. 11, the transmission / reception system 101 includes a transmission device 30 and the display device 1 according to the first embodiment or the display device 20 according to the second embodiment.
　（送信装置３０）
　本実施形態に係る送信装置３０について、図１１を参照して説明する。図１１が示すように、送信装置３０は、処理部３１（請求項における映像信号生成装置に相当）、及び送信部３２を備えている。処理部３１は、映像信号取得部３３、音声信号取得部３４、階調範囲指定情報取得部３５、映像信号符号化部３６、音声信号符号化部３７、生成部３８（請求項におけるメタデータ生成部に相当）、多重化部３９、暗号化部４０、及び変調部４１を備えている。 (Transmitter 30)
The transmission device 30 according to the present embodiment will be described with reference to FIG. As illustrated in FIG. 11, the transmission device 30 includes a processing unit 31 (corresponding to a video signal generation device in claims) and a transmission unit 32. The processing unit 31 includes a video signal acquisition unit 33, an audio signal acquisition unit 34, a gradation range designation information acquisition unit 35, a video signal encoding unit 36, an audio signal encoding unit 37, and a generation unit 38 (metadata generation in claims) A multiplexing unit 39, an encryption unit 40, and a modulation unit 41.
　映像信号取得部３３は、外部から映像信号を取得する。なお、本実施形態における映像信号は、ＨＤＲ映像信号であることが好ましいが、特に限定はない。 The video signal acquisition unit 33 acquires a video signal from the outside. Note that the video signal in the present embodiment is preferably an HDR video signal, but there is no particular limitation.
　音声信号取得部３４は、外部から音声信号を取得する。 The audio signal acquisition unit 34 acquires an audio signal from the outside.
　階調範囲指定情報取得部３５は、映像信号取得部３３が取得した映像信号が示す映像に関し、階調特性を調整する階調範囲を指定する階調範囲指定情報を取得する。 The gradation range specification information acquisition unit 35 acquires gradation range specification information for specifying a gradation range for adjusting the gradation characteristics for the video indicated by the video signal acquired by the video signal acquisition unit 33.
　映像信号符号化部３６は、映像信号取得部３３が取得した映像信号を符号化する。 The video signal encoding unit 36 encodes the video signal acquired by the video signal acquisition unit 33.
　音声信号符号化部３７は、音声信号取得部３４が取得した音声信号を符号化する。 The audio signal encoding unit 37 encodes the audio signal acquired by the audio signal acquisition unit 34.
　生成部３８は、階調範囲指定情報取得部３５が取得した階調範囲指定情報を含むメタデータを生成する。 The generation unit 38 generates metadata including the gradation range designation information acquired by the gradation range specification information acquisition unit 35.
　多重化部３９は、映像信号符号化部３６が符号化した映像信号と、音声信号符号化部３７が符号化した音声信号と、生成部３８が生成したメタデータとを多重化する。 The multiplexing unit 39 multiplexes the video signal encoded by the video signal encoding unit 36, the audio signal encoded by the audio signal encoding unit 37, and the metadata generated by the generation unit 38.
　暗号化部４０は、多重化部３９が多重化したデータを暗号化する。 The encryption unit 40 encrypts the data multiplexed by the multiplexing unit 39.
　変調部４１は、暗号化部４０が暗号化したデータを変調処理する。 The modulation unit 41 modulates the data encrypted by the encryption unit 40.
　送信部３２は、変調部４１が変調処理したデータを放送波として表示装置１又は２０に送信する。 The transmission unit 32 transmits the data modulated by the modulation unit 41 to the display device 1 or 20 as a broadcast wave.
　（送信装置３０による映像信号生成方法）
　本実施形態に係る送信装置３０により実行される映像信号生成方法の流れを、図１２を参照して説明する。図１２は、送信装置３０により実行される映像信号生成方法の流れを示すフローチャートである。 (Video signal generation method by transmission device 30)
A flow of a video signal generation method executed by the transmission apparatus 30 according to the present embodiment will be described with reference to FIG. FIG. 12 is a flowchart showing the flow of the video signal generation method executed by the transmission device 30.
　まず、ステップＳ２０において、映像信号取得部３３は、外部から映像信号を取得し、音声信号取得部３４は、外部から音声信号を取得する。また、ステップＳ２０において、階調範囲指定情報取得部３５は、映像信号取得部３３が取得した映像信号が示す映像に関し、階調特性を調整する階調範囲を指定する階調範囲指定情報を取得する。 First, in step S20, the video signal acquisition unit 33 acquires a video signal from the outside, and the audio signal acquisition unit 34 acquires an audio signal from the outside. In step S20, the gradation range specification information acquisition unit 35 acquires gradation range specification information for specifying the gradation range for adjusting the gradation characteristics regarding the video indicated by the video signal acquired by the video signal acquisition unit 33. To do.
　なお、階調範囲指定情報取得部３５が取得する階調範囲指定情報は、表示装置１又は２０が階調値を輝度値に変換する際に、他の階調範囲とは異なる変換を行う階調範囲を指定する情報であり得る。情報階調範囲指定情報の例として、映像信号が含む階調値の階調範囲におけるセンター値、下限値及び上限値等が挙げられる。 Note that the gradation range designation information acquired by the gradation range designation information acquisition unit 35 is a floor that performs conversion different from other gradation ranges when the display device 1 or 20 converts gradation values into luminance values. It may be information that specifies a key range. Examples of the information gradation range designation information include a center value, a lower limit value, and an upper limit value in the gradation range of gradation values included in the video signal.
　ステップＳ２０の次の工程として、映像信号符号化部３６は、映像信号取得部３３が取得した映像信号を符号化し、音声信号符号化部３７は、音声信号取得部３４が取得した音声信号を符号化する（ステップＳ２１）。 As the next step of step S20, the video signal encoding unit 36 encodes the video signal acquired by the video signal acquisition unit 33, and the audio signal encoding unit 37 encodes the audio signal acquired by the audio signal acquisition unit 34. (Step S21).
　次に、生成部３８は、階調範囲指定情報取得部３５が取得した階調範囲指定情報を含むメタデータを生成する（ステップＳ２２）。 Next, the generation unit 38 generates metadata including the gradation range designation information acquired by the gradation range designation information acquisition unit 35 (step S22).
　次に、多重化部３９は、映像信号符号化部３６が符号化した映像信号と、音声信号符号化部３７が符号化した音声信号と、生成部３８が生成したメタデータとを多重化する（ステップＳ２３）。 Next, the multiplexing unit 39 multiplexes the video signal encoded by the video signal encoding unit 36, the audio signal encoded by the audio signal encoding unit 37, and the metadata generated by the generation unit 38. (Step S23).
　次に、暗号化部４０は、多重化部３９が多重化したデータを暗号化する（ステップＳ２４）。 Next, the encryption unit 40 encrypts the data multiplexed by the multiplexing unit 39 (step S24).
　次に、変調部４１は、暗号化部４０が暗号化したデータを変調処理する（ステップＳ２５）。 Next, the modulation unit 41 modulates the data encrypted by the encryption unit 40 (step S25).
　次に、送信部３２は、変調部４１が変調処理したデータを放送波として表示装置１又は２０に送信する（ステップＳ２６）。 Next, the transmission unit 32 transmits the data modulated by the modulation unit 41 to the display device 1 or 20 as a broadcast wave (step S26).
　送信装置３０の送信部３２が送信した放送波は、表示装置１又は表示装置２０によって受信され、表示装置１又は表示装置２０は、実施形態１又は２において説明した輝度変換方法を実行する。 Broadcast waves transmitted by the transmission unit 32 of the transmission device 30 are received by the display device 1 or the display device 20, and the display device 1 or the display device 20 executes the luminance conversion method described in the first or second embodiment.
　（実施形態３のまとめ）
　以上のように、本実施形態に係る送受信システム１０１が含む送信装置３０は、映像データが示す映像に関し、階調特性を調整する階調範囲を指定する階調範囲指定情報を含むメタデータを生成する。当該構成により、生成された階調範囲指定情報を含むメタデータを受信した受信装置において、階調範囲指定情報に基づいて映像の階調特性を調整することができる。これにより、映像の作成者が階調範囲を指定した階調範囲指定情報を用いることで、映像の作成者の意図が反映された輝度で映像を表示することができる。 (Summary of Embodiment 3)
As described above, the transmission device 30 included in the transmission / reception system 101 according to the present embodiment generates metadata including gradation range designation information that designates a gradation range for adjusting gradation characteristics regarding the video indicated by the video data. To do. With this configuration, the receiving device that has received the metadata including the generated gradation range designation information can adjust the gradation characteristics of the video based on the gradation range designation information. As a result, by using the gradation range designation information in which the creator of the image has designated the gradation range, the image can be displayed with a luminance that reflects the intention of the creator of the image.
　〔ソフトウェアによる実現例〕
　表示装置１若しくは表示装置２０又は送信装置３０の制御ブロック（特に、処理部３又は処理部３１）は、集積回路（ＩＣチップ）等に形成された論理回路（ハードウェア）によって実現してもよいし、ＣＰＵ（Central Processing Unit）を用いてソフトウェアによって実現してもよい。 [Example of software implementation]
The control block (particularly, the processing unit 3 or the processing unit 31) of the display device 1, the display device 20, or the transmission device 30 may be realized by a logic circuit (hardware) formed in an integrated circuit (IC chip) or the like. However, it may be realized by software using a CPU (Central Processing Unit).
　後者の場合、表示装置１若しくは表示装置２０又は送信装置３０は、各機能を実現するソフトウェアであるプログラムの命令を実行するＣＰＵ、上記プログラム及び各種データがコンピュータ（又はＣＰＵ）で読み取り可能に記録されたＲＯＭ（Read Only Memory）又は記憶装置（これらを「記録媒体」と称する）、上記プログラムを展開するＲＡＭ（Random Access Memory）などを備えている。そして、コンピュータ（又はＣＰＵ）が上記プログラムを上記記録媒体から読み取って実行することにより、本発明の目的が達成される。上記記録媒体としては、「一時的でない有形の媒体」、例えば、テープ、ディスク、カード、半導体メモリ、プログラマブルな論理回路などを用いることができる。また、上記プログラムは、該プログラムを伝送可能な任意の伝送媒体（通信ネットワークや放送波等）を介して上記コンピュータに供給されてもよい。なお、本発明の一態様は、上記プログラムが電子的な伝送によって具現化された、搬送波に埋め込まれたデータ信号の形態でも実現され得る。 In the latter case, the display device 1, the display device 20, or the transmission device 30 has a CPU that executes instructions of a program that is software that realizes each function, and the program and various data are recorded so as to be readable by a computer (or CPU). ROM (Read Only Memory) or storage device (these are referred to as “recording media”), RAM (Random Access Memory) for expanding the program, and the like. And the objective of this invention is achieved when a computer (or CPU) reads the said program from the said recording medium and runs it. As the recording medium, a “non-temporary tangible medium” such as a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used. The program may be supplied to the computer via an arbitrary transmission medium (such as a communication network or a broadcast wave) that can transmit the program. Note that one embodiment of the present invention can also be realized in the form of a data signal embedded in a carrier wave, in which the program is embodied by electronic transmission.
　〔まとめ〕
　本発明の態様１に係る映像信号生成装置（処理部３１）は、映像データとメタデータとを含む映像信号を生成する映像信号生成装置であって、上記映像データが示す映像に関し、階調特性を調整する階調範囲を指定する階調範囲指定情報を含むメタデータを生成するメタデータ生成部（生成部３８）を備えている。 [Summary]
A video signal generation device (processing unit 31) according to aspect 1 of the present invention is a video signal generation device that generates a video signal including video data and metadata, and relates to a video indicated by the video data, and has gradation characteristics. A metadata generation unit (generation unit 38) that generates metadata including gradation range designation information that designates a gradation range for adjusting the tone range.
　上記の構成によれば、生成された階調範囲指定情報を含むメタデータを受信した受信装置において、階調範囲指定情報に基づいて映像の階調特性を調整することができる。これにより、映像の作成者が階調範囲を指定した階調範囲指定情報を用いることで、映像の作成者の意図が反映された輝度で映像を表示することができる。 According to the above configuration, the receiving device that has received the metadata including the generated gradation range designation information can adjust the gradation characteristics of the video based on the gradation range designation information. As a result, by using the gradation range designation information in which the creator of the image has designated the gradation range, the image can be displayed with a luminance that reflects the intention of the creator of the image.
　本発明の態様２に係る受信装置（表示装置１又は２０）は、映像データを含む映像信号を受信する受信装置であって、上記映像データが示す映像に関し、階調特性を調整する階調範囲を指定する階調範囲指定情報を取得する取得部（読出部１０）と、上記取得部が取得した階調範囲指定情報を参照して、上記映像データが示す映像の輝度変換を行う変換部（１２）とを備えている。 A receiving device (display device 1 or 20) according to aspect 2 of the present invention is a receiving device that receives a video signal including video data, and has a gradation range for adjusting a gradation characteristic with respect to the video indicated by the video data. An acquisition unit (reading unit 10) that acquires gradation range specification information that specifies the image, and a conversion unit that performs luminance conversion of the video indicated by the video data with reference to the gradation range specification information acquired by the acquisition unit ( 12).
　上記の構成によれば、取得した階調範囲指定情報に基づいて映像の階調特性を調整することができる。これにより、映像の作成者が階調範囲を指定した階調範囲指定情報を用いることで、映像の作成者の意図が反映された輝度で映像を表示することができる。 According to the above configuration, the gradation characteristics of the video can be adjusted based on the acquired gradation range designation information. As a result, by using the gradation range designation information in which the creator of the image has designated the gradation range, the image can be displayed with a luminance that reflects the intention of the creator of the image.
　本発明の態様３に係る受信装置（表示装置１）は、上記態様２において、上記階調範囲指定情報を、上記映像信号に含まれるメタデータから取得してもよい。 In the aspect 2, the receiving apparatus (display apparatus 1) according to aspect 3 of the present invention may acquire the gradation range designation information from metadata included in the video signal.
　上記の構成によれば、受信した映像信号に含まれるメタデータから階調範囲指定情報を取得すればよいため、階調範囲指定情報を外部から取得するための部材が不要である。 According to the above configuration, it is only necessary to acquire the gradation range designation information from the metadata included in the received video signal, so that a member for obtaining the gradation range designation information from the outside is unnecessary.
　本発明の態様４に係る受信装置（表示装置１又は２０）は、上記態様２又は３において、前記変換部は、上記階調範囲指定情報によって指定される階調範囲に対応する輝度が、上記階調範囲指定情報を参照しない場合の輝度よりも向上するような変換関数を用いて、上記映像データが示す映像の輝度変換を行ってもよい。 In the reception device (display device 1 or 20) according to aspect 4 of the present invention, in the aspect 2 or 3, the conversion unit has the luminance corresponding to the gradation range specified by the gradation range specification information described above. The luminance conversion of the video indicated by the video data may be performed by using a conversion function that improves the luminance when the gradation range designation information is not referred to.
　上記の構成によれば、ディスプレイが表示可能な輝度範囲が狭いために、特定の階調範囲に対応する変換後の輝度が低下してしまう場合に、当該輝度を向上することができる。 According to the above configuration, since the luminance range that can be displayed by the display is narrow, the luminance can be improved when the luminance after conversion corresponding to the specific gradation range is lowered.
　本発明の態様５に係る受信装置（表示装置１又は２０）は、上記態様２～４において、前記変換部は、上記階調範囲指定情報によって指定される階調範囲において、上記映像データを生成する際に用いられたＯＥＴＦ関数の逆関数と同じＥＯＴＦ関数を用いて、上記映像データが示す映像の輝度変換を行ってもよい。 In the reception device (display device 1 or 20) according to aspect 5 of the present invention, in any of the above aspects 2 to 4, the conversion unit generates the video data in a gradation range specified by the gradation range specification information. The luminance conversion of the video indicated by the video data may be performed by using the same EOTF function as the inverse function of the OETF function used when performing the above.
　上記の構成によれば、ディスプレイが表示可能な輝度範囲が狭いために、特定の階調範囲に対応する変換後の輝度が映像の製作者の意図に沿っていない場合に、当該階調範囲の階調値を、当該階調値の元となった輝度に従った輝度に変換することができる。 According to the above configuration, since the luminance range that can be displayed by the display is narrow, the converted luminance corresponding to the specific gradation range is not in accordance with the intention of the video producer, The gradation value can be converted into a luminance according to the luminance from which the gradation value is based.
　本発明の態様６に係る受信装置（表示装置１又は２０）は、上記態様２～４において、前記変換部は、上記階調範囲指定情報によって指定される階調範囲において、上記映像データを生成する際に用いられたＯＥＴＦ関数の逆関数にオフセットを付加して得られるＥＯＴＦ関数を用いて、上記映像データが示す映像の輝度変換を行ってもよい。 In the reception device (display device 1 or 20) according to aspect 6 of the present invention, in any of the above aspects 2 to 4, the conversion unit generates the video data in the gradation range specified by the gradation range specification information. The luminance conversion of the video indicated by the video data may be performed using an EOTF function obtained by adding an offset to the inverse function of the OETF function used at the time.
　上記の構成によれば、ディスプレイが表示可能な輝度範囲が狭いために、特定の階調範囲に対応する変換後の輝度が映像の製作者の意図に沿っていない場合に、当該階調範囲の階調値を、当該階調値の元となった輝度に従い且つディスプレイの表示可能な輝度範囲等の環境に応じた輝度に変換することができる。 According to the above configuration, since the luminance range that can be displayed by the display is narrow, the converted luminance corresponding to the specific gradation range is not in accordance with the intention of the video producer, The gradation value can be converted into a luminance according to an environment such as a luminance range that can be displayed on the display in accordance with the luminance that is the basis of the gradation value.
　本発明の態様７に係る受信装置（表示装置１又は２０）は、上記態様２～４において、前記変換部は、上記階調範囲指定情報によって指定される階調範囲において、上記映像データを生成する際に用いられたＯＥＴＦ関数の逆関数よりも傾きの大きいＥＯＴＦ関数を用いて、上記映像データが示す映像の輝度変換を行ってもよい。 In the reception device (display device 1 or 20) according to aspect 7 of the present invention, in any of the above aspects 2 to 4, the conversion unit generates the video data in a gradation range specified by the gradation range specification information. The luminance conversion of the video indicated by the video data may be performed using an EOTF function having a larger slope than the inverse function of the OETF function used in the process.
　上記の構成によれば、ディスプレイが表示可能な輝度範囲が狭いために、特定の階調範囲に対応する変換後の輝度が映像の製作者の意図に沿っていない場合に、当該階調範囲の階調値を、当該階調値の元となった輝度に従い且つディスプレイの表示可能な輝度範囲等の環境に応じた輝度に変換することができる。 According to the above configuration, since the luminance range that can be displayed by the display is narrow, when the converted luminance corresponding to a specific gradation range does not conform to the intention of the image producer, The gradation value can be converted into a luminance according to an environment such as a luminance range that can be displayed on the display in accordance with the luminance that is the basis of the gradation value.
　本発明の態様８に係るテレビジョン受像機（１００）は、上記態様２～７の何れか１つに記載の受信装置を備えている。 A television receiver (100) according to aspect 8 of the present invention includes the receiving device according to any one of aspects 2 to 7.
　上記の構成によれば、上記受信装置が上記各態様において奏する効果を上記テレビジョン受像機において得ることができる。 According to the above configuration, the television receiver can obtain the effects that the receiving device has in each aspect.
　本発明の態様９に係る送受信システム（１０１）は、映像データとメタデータとを含む映像信号を生成する映像信号生成装置（処理部３１）と、上記映像データを含む上記映像信号を受信する受信装置（表示装置１又は２０）とを含む送受信システムであって、上記映像信号生成装置は、上記映像データが示す映像に関し、階調特性を調整する階調範囲を指定する階調範囲指定情報を含むメタデータを生成するメタデータ生成部（生成部３８）を備え、上記受信装置は、上記階調範囲指定情報を取得する取得部（読出部１０）と、上記取得部が取得した上記階調範囲指定情報を参照して、上記映像データが示す映像の輝度変換を行う変換部（１２）とを備えている。 A transmission / reception system (101) according to an aspect 9 of the present invention includes a video signal generation device (processing unit 31) that generates a video signal including video data and metadata, and reception that receives the video signal including the video data. A transmission / reception system including a display device (display device 1 or 20), wherein the video signal generation device includes gradation range designation information for designating a gradation range for adjusting a gradation characteristic with respect to a video indicated by the video data. A metadata generation unit (generation unit 38) for generating metadata including the acquisition unit, the reception device acquiring the gradation range designation information (reading unit 10), and the gradation acquired by the acquisition unit A conversion unit (12) that performs luminance conversion of the video indicated by the video data with reference to the range designation information.
　上記の構成によれば、上記態様１及び２と同様の効果を奏する。 According to said structure, there exists an effect similar to the said aspect 1 and 2.
　本発明の態様１０に係る映像信号生成方法は、映像データとメタデータとを含む映像信号を生成する映像信号生成装置（処理部３１）による映像信号生成方法であって、上記映像データが示す映像に関し、階調特性を調整する階調範囲を指定する階調範囲指定情報を含むメタデータを生成するメタデータ生成工程を含む。 A video signal generation method according to an aspect 10 of the present invention is a video signal generation method by a video signal generation device (processing unit 31) that generates a video signal including video data and metadata, and the video indicated by the video data And a metadata generation step of generating metadata including gradation range designation information that designates a gradation range for adjusting gradation characteristics.
　上記の構成によれば、上記態様１と同様の効果を奏する。 According to said structure, there exists an effect similar to the said aspect 1.
　本発明の態様１１に係る輝度変換方法は、映像データを含む映像信号を受信する受信装置による輝度変換方法であって、上記映像データが示す映像に関し、階調特性を調整する階調範囲を指定する階調範囲指定情報を取得する取得工程と、上記取得工程で取得した階調範囲指定情報を参照して、上記映像データが示す映像の輝度変換を行う変換工程とを含む。 A luminance conversion method according to an aspect 11 of the present invention is a luminance conversion method by a receiving device that receives a video signal including video data, and specifies a gradation range for adjusting a gradation characteristic with respect to the video indicated by the video data. An acquisition step of acquiring gradation range designation information to be performed, and a conversion step of performing luminance conversion of the video indicated by the video data with reference to the gradation range designation information acquired in the acquisition step.
　上記の構成によれば、上記態様２と同様の効果を奏する。 According to said structure, there exists an effect similar to the said aspect 2.
　本発明の各態様に係る映像信号生成装置及び受信装置は、コンピュータによって実現してもよく、この場合には、コンピュータを上記映像信号生成装置及び上記受信装置が備える各部（ソフトウェア要素）として動作させることにより上記映像信号生成装置及び上記受信装置をコンピュータにて実現させる映像信号生成装置の制御プログラム及び受信装置の制御プログラム、並びに、それを記録したコンピュータ読み取り可能な記録媒体も、本発明の範疇に入る。 The video signal generation device and the reception device according to each aspect of the present invention may be realized by a computer. In this case, the computer is operated as each unit (software element) included in the video signal generation device and the reception device. Accordingly, a video signal generation device control program and a reception device control program for realizing the video signal generation device and the reception device on a computer, and a computer-readable recording medium on which the control program is recorded are also included in the scope of the present invention. enter.
　本発明は上述した各実施形態に限定されるものではなく、請求項に示した範囲で種々の変更が可能であり、異なる実施形態にそれぞれ開示された技術的手段を適宜組み合わせて得られる実施形態についても本発明の技術的範囲に含まれる。さらに、各実施形態にそれぞれ開示された技術的手段を組み合わせることにより、新しい技術的特徴を形成することができる。 The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention. Furthermore, a new technical feature can be formed by combining the technical means disclosed in each embodiment.
　１、２０　表示装置
　２　受信部
　３処理部
　４　表示部
　５　復調部
　６　暗号復号部
　７　逆多重化部
　８　映像信号復号化部
　９　音声信号復号化部
　１０　取得部読出部
　１０　読出部
　１１　切替部
　１２　変換部
　１３　表示制御部
　２１　通信部
　３０　送信装置
　３１　処理部
　３２　送信部
　３３　映像信号取得部
　３４　音声信号取得部
　３５　階調範囲指定情報取得部
　３６　映像信号符号化部
　３７　音声信号符号化部
　３８　生成部
　３９　多重化部
　４０　暗号化部
　４１　変調部
　１００　テレビジョン受像機
　１０１　送受信システム DESCRIPTION OF SYMBOLS 1,20 Display apparatus 2 Reception part 3 Processing part 4 Display part 5 Demodulation part 6 Encryption decoding part 7 Demultiplexing part 8 Video signal decoding part 9 Audio | voice signal decoding part 10 Acquisition part reading part 10 Reading part 11 Switching part 12 Conversion unit 13 Display control unit 21 Communication unit 30 Transmission device 31 Processing unit 32 Transmission unit 33 Video signal acquisition unit 34 Audio signal acquisition unit 35 Tone range designation information acquisition unit 36 Video signal encoding unit 37 Audio signal encoding unit 38 generation Unit 39 multiplexing unit 40 encryption unit 41 modulation unit 100 television receiver 101 transmission / reception system

Claims (15)

  1. 　映像データとメタデータとを含む映像信号を生成する映像信号生成装置であって、
    　上記映像データが示す映像に関し、階調特性を調整する階調範囲を指定する階調範囲指定情報を含むメタデータを生成するメタデータ生成部を備えている
    ことを特徴とする映像信号生成装置。     A video signal generation device that generates a video signal including video data and metadata,
    A video signal generation apparatus comprising: a metadata generation unit that generates metadata including gradation range designation information that designates a gradation range for adjusting gradation characteristics with respect to an image represented by the image data.
  2. 　映像データを含む映像信号を受信する受信装置であって、
    　上記映像データが示す映像に関し、階調特性を調整する階調範囲を指定する階調範囲指定情報を取得する取得部と、
    　上記取得部が取得した階調範囲指定情報を参照して、上記映像データが示す映像の輝度変換を行う変換部と
    を備えていることを特徴とする受信装置。     A receiving device for receiving a video signal including video data,
    An acquisition unit that acquires gradation range designation information that designates a gradation range for adjusting gradation characteristics with respect to the video indicated by the video data;
    A receiving apparatus comprising: a conversion unit that performs luminance conversion of a video indicated by the video data with reference to the gradation range designation information acquired by the acquisition unit.
  3. 　上記取得部は、上記階調範囲指定情報を、上記映像信号に含まれるメタデータから取得することを特徴とする請求項２に記載の受信装置。 The receiving apparatus according to claim 2, wherein the acquisition unit acquires the gradation range designation information from metadata included in the video signal.
  4. 　前記変換部は、
    　上記階調範囲指定情報によって指定される階調範囲に対応する輝度が、上記階調範囲指定情報を参照しない場合の輝度よりも向上するような変換関数を用いて、上記映像データが示す映像の輝度変換を行う
    ことを特徴とする請求項２又は３に記載の受信装置。     The converter is
    Using a conversion function such that the luminance corresponding to the gradation range designated by the gradation range designation information is higher than the luminance when not referring to the gradation range designation information, the video data indicated by the video data is displayed. 4. The receiving apparatus according to claim 2, wherein brightness conversion is performed.
  5. 　前記変換部は、
    　上記階調範囲指定情報によって指定される階調範囲において、上記映像データを生成する際に用いられたＯＥＴＦ関数の逆関数と同じＥＯＴＦ関数を用いて、上記映像データが示す映像の輝度変換を行う
    ことを特徴とする請求項２から４の何れか１項に記載の受信装置。     The converter is
    Using the same EOTF function as the inverse function of the OETF function used when generating the video data, the luminance of the video indicated by the video data is converted in the gradation range specified by the gradation range specification information. The receiving apparatus according to any one of claims 2 to 4, wherein the receiving apparatus is configured as described above.
  6. 　前記変換部は、
    　上記階調範囲指定情報によって指定される階調範囲において、上記映像データを生成する際に用いられたＯＥＴＦ関数の逆関数にオフセットを付加して得られるＥＯＴＦ関数を用いて、上記映像データが示す映像の輝度変換を行う
    ことを特徴とする請求項２から４の何れか１項に記載の受信装置。     The converter is
    In the gradation range designated by the gradation range designation information, the video data indicates by using an EOTF function obtained by adding an offset to the inverse function of the OETF function used when generating the video data. 5. The receiving apparatus according to claim 2, wherein luminance conversion of video is performed.
  7. 　前記変換部は、
    　上記階調範囲指定情報によって指定される階調範囲において、上記映像データを生成する際に用いられたＯＥＴＦ関数の逆関数よりも傾きの大きいＥＯＴＦ関数を用いて、上記映像データが示す映像の輝度変換を行う
    ことを特徴とする請求項２から４の何れか１項に記載の受信装置。     The converter is
    In the gradation range designated by the gradation range designation information, the luminance of the video indicated by the video data using an EOTF function having a larger slope than the inverse function of the OETF function used when generating the video data 5. The receiving apparatus according to claim 2, wherein conversion is performed.
  8. 　請求項２～７の何れか１項に記載の受信装置を備えているテレビジョン受像機。 A television receiver comprising the receiving device according to any one of claims 2 to 7.
  9. 　映像データとメタデータとを含む映像信号を生成する映像信号生成装置と、上記映像データを含む上記映像信号を受信する受信装置とを含む送受信システムであって、
    　上記映像信号生成装置は、
    　　上記映像データが示す映像に関し、階調特性を調整する階調範囲を指定する階調範囲指定情報を含むメタデータを生成するメタデータ生成部を備え、
    　上記受信装置は、
    　　上記階調範囲指定情報を取得する取得部と、
    　　上記取得部が取得した上記階調範囲指定情報を参照して、上記映像データが示す映像の輝度変換を行う変換部と
    を備えていることを特徴とする送受信システム。     A transmission / reception system including a video signal generation device that generates a video signal including video data and metadata, and a reception device that receives the video signal including the video data,
    The video signal generation device includes:
    A metadata generation unit that generates metadata including gradation range designation information that designates a gradation range for adjusting gradation characteristics with respect to the video indicated by the video data,
    The receiving device is
    An acquisition unit for acquiring the gradation range designation information;
    A transmission / reception system comprising: a conversion unit that performs luminance conversion of a video indicated by the video data with reference to the gradation range designation information acquired by the acquisition unit.
  10. 　映像データとメタデータとを含む映像信号を生成する映像信号生成装置による映像信号生成方法であって、
    　上記映像データが示す映像に関し、階調特性を調整する階調範囲を指定する階調範囲指定情報を含むメタデータを生成するメタデータ生成工程を含む
    ことを特徴とする映像信号生成方法。     A video signal generation method by a video signal generation device that generates a video signal including video data and metadata,
    A video signal generation method, comprising: a metadata generation step of generating metadata including gradation range designation information for designating a gradation range for adjusting gradation characteristics with respect to an image represented by the image data.
  11. 　映像データを含む映像信号を受信する受信装置による輝度変換方法であって、
    　上記映像データが示す映像に関し、階調特性を調整する階調範囲を指定する階調範囲指定情報を取得する取得工程と、
    　上記取得工程で取得した階調範囲指定情報を参照して、上記映像データが示す映像の輝度変換を行う変換工程と
    を含むことを特徴とする輝度変換方法。     A luminance conversion method by a receiving device that receives a video signal including video data,
    With respect to the video indicated by the video data, an acquisition step of acquiring gradation range designation information for designating a gradation range for adjusting gradation characteristics;
    A luminance conversion method comprising: a conversion step of performing luminance conversion of a video indicated by the video data with reference to the gradation range designation information acquired in the acquisition step.
  12. 　請求項１に記載の映像信号生成装置としてコンピュータを機能させるための制御プログラムであって、上記メタデータ生成部としてコンピュータを機能させるための制御プログラム。 A control program for causing a computer to function as the video signal generation device according to claim 1, wherein the control program causes the computer to function as the metadata generation unit.
  13. 　請求項２に記載の受信装置としてコンピュータを機能させるための制御プログラムであって、上記取得部及び上記変換部としてコンピュータを機能させるための制御プログラム。 A control program for causing a computer to function as the receiving device according to claim 2, wherein the control program causes the computer to function as the acquisition unit and the conversion unit.
  14. 　請求項１２に記載の制御プログラムを記録したコンピュータ読み取り可能な記録媒体。 A computer-readable recording medium on which the control program according to claim 12 is recorded.
  15. 　請求項１３に記載の制御プログラムを記録したコンピュータ読み取り可能な記録媒体。 A computer-readable recording medium on which the control program according to claim 13 is recorded.
PCT/JP2018/007093 2017-02-28 2018-02-27 Image signal generation device, reception device, television receiver, transmission/reception system, control program, and recording medium WO2018159570A1 (en)

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