Transmission apparatus, transmission method, reception apparatus, and reception method
A transmission apparatus includes circuitry configured to perform high dynamic range (HDR) opto-electronic conversion on HDR video data to obtain HDR transmission video data. An encoder receives input of at least the HDR transmission video data and output a video stream including coded video data, and a transmitter sends the video stream. The circuitry is further configured to insert HDR conversion characteristic meta-information into the video stream, the HDR conversion characteristic meta-information indicating a characteristic of the HDR conversion.
1. A transmission apparatus, comprising:
circuitry configured to
perform high dynamic range (HDR) opto-electronic conversion on HDR video data to obtain HDR transmission video data,
encode the HDR transmission video data and output a video stream including coded HDR transmission video data,
insert HDR conversion characteristic meta-information into the video stream, the HDR conversion characteristic meta-information indicating an HDR conversion characteristic,
insert peak luminance information into the video stream, and send the video stream, wherein
a display luminance of the HDR transmission video data is adjusted based on the peak luminance information included in the video stream, the adjustment of the display luminance of the HDR transmission video data and HDR electro-optical conversion on the HDR transmission video data being separate processes.
2. The transmission apparatus according to claim 1 , wherein the circuitry is further configured to
perform standard dynamic range (SDR) opto-electronic conversion on SDR video data to obtain SDR transmission video data,
perform predictive coding on the SDR transmission video data to obtain a base video stream including coded SDR transmission video data,
perform predictive coding on the HDR transmission video data using the SDR transmission video data to obtain an extended video stream including the coded HDR transmission video data,
insert the HDR conversion characteristic meta-information into a supplemental enhancement information (SEI) network abstraction layer (NAL) portion of the extended video stream, and
insert SDR conversion characteristic meta-information into a sequence parameter set (SPS) NAL portion of the base video stream, the SDR conversion characteristic meta-information indicating a characteristic of the SDR opto-electronic conversion.
3. The transmission apparatus according to claim 2 , wherein
the circuitry is further configured to insert meta-information for display control into the SEI NAL portion of the extended video stream together with the HDR conversion characteristic meta-information.
4. The transmission apparatus according to claim 3 , wherein
the meta-information for display control includes the peak luminance information.
5. The transmission apparatus according to claim 3 , wherein
the meta-information for display control includes area information indicating an area in which luminance conversion is allowed.
6. The transmission apparatus of claim 1 , wherein
the HDR conversion characteristic is of at least one of optical-to-electronic conversion and electronic-to-optical conversion.
7. A transmission method, comprising:
performing, by circuitry of a transmission apparatus, high dynamic range (HDR) opto-electronic conversion on HDR video data to obtain HDR transmission video data;
encoding the HDR transmission video data and outputting a video stream including coded HDR transmission video data;
inserting HDR conversion characteristic meta-information the video stream, the HDR conversion characteristic meta-information indicating an HDR conversion characteristic;
inserting peak luminance information into the video stream; and sending the video stream, wherein
a display luminance of the HDR transmission video data is adjusted based on the peak luminance information included in the video stream, the adjustment of the display luminance of the HDR transmission video data and HDR electro-optical conversion on the HDR transmission video data being separate processes.
8. The transmission method of claim 7 , further comprising:
performing standard dynamic range (SDR) opto-electronic conversion on SDR video data to obtain SDR transmission video data;
performing predictive coding on the SDR transmission video data to obtain a base video stream including coded SDR transmission video data;
performing predictive coding on the HDR transmission video data using the SDR transmission video data to obtain an extended video stream including the coded HDR transmission video data;
inserting the HDR conversion characteristic meta-information into a supplemental enhancement information (SEI) network abstraction layer (NAL) portion of the extended video stream; and
inserting SDR conversion characteristic meta-information into a sequence parameter set (SPS) NAL portion of the base video stream, the SDR conversion characteristic meta-information indicating a characteristic of the SDR opto-electronic conversion.
9. The transmission method of claim 7 , wherein
the HDR conversion characteristic is of at least one of optical-to-electronic conversion and electronic-to-optical conversion.
10. A reception apparatus, comprising:
circuitry configured to
receive a video stream;
decode the video stream to obtain high dynamic range (HDR) transmission video data, the video stream including HDR conversion characteristic meta-information that indicates an HDR conversion characteristic and including peak luminance information;
perform HDR electro-optical conversion on the HDR transmission video data based on the HDR conversion characteristic meta-information to obtain video data for display; and
adjust a display luminance of the HDR transmission video data based on the peak luminance information included in the video stream,
wherein the adjustment of the display luminance of the HDR transmission video data and HDR electro-optical conversion on the HDR transmission video data are separate processes.
11. The reception apparatus according to claim 10 , further comprising:
a display configured to display an image corresponding to the video data.
12. The reception apparatus according to claim 10 , wherein
the video stream includes
a base video stream including coded standard dynamic range (SDR) transmission video data obtained by performing predictive coding on SDR transmission video data, and
an extended video stream including coded HDR video data obtained by performing predictive coding on the HDR transmission video data using the SDR transmission video data, and
the circuitry is further configured to
decode the base video stream to obtain the SDR transmission video data, and
decode the extended video stream to obtain the HDR transmission video data, the HDR conversion characteristic meta-information being included in a supplemental enhancement information (SEI) network abstraction layer (NAL) portion of the extended video stream.
13. The reception apparatus according to claim 12 , wherein
the peak luminance information is included in the SEI NAL of the extended video stream.
14. The reception apparatus according to claim 13 , wherein
the circuitry is further configured to
obtain area information indicating an area in which luminance conversion is allowed from the SEI NAL of the extended video stream, and
adjust the display luminance in the area in which luminance conversion is allowed, based on the area information.
15. A reception method, comprising:
receiving a video stream;
decoding the video stream to obtain high dynamic range (HDR) transmission video data, the video stream including a supplemental enhancement information (SEI) network abstraction layer (NAL) portion in which HDR conversion characteristic meta-information is included and including peak luminance information, the HDR conversion characteristic meta- information indicating an HDR conversion characteristic;
performing HDR electro-optical conversion on the HDR transmission video data based on the HDR conversion characteristic meta-information to obtain video data for display; and adjusting a display luminance of the HDR transmission video data based on the peak luminance information included in the video stream,
wherein the adjustment of the display luminance of the HDR transmission video data and HDR electro-optical conversion on the HDR transmission video data are separate processes.
16. The reception method according to claim 15 , further comprising:
displaying the video data on a display.
17. The reception method according to claim 15 , wherein:
the video stream includes
a base video stream including coded standard dynamic range (SDR) transmission video data obtained by performing predictive coding on SDR transmission video data to predictive coding, and
an extended video stream including coded HDR video data obtained by performing predictive coding on the HDR transmission video data using the SDR transmission video data, and
the reception method further comprises
decoding the base video stream to obtain the SDR transmission video data, and
decoding the extended video stream to obtain the HDR transmission video data, the HDR conversion characteristic meta-information being included in a supplemental enhancement information (SEI) network abstraction layer (NAL) portion of the extended video stream.
18. The reception method according to claim 17 , wherein
the peak luminance information is included in the SEI NAL of the extended video stream.
19. The reception method according to claim 18 , further comprising:
obtaining area information indicating an area in which luminance conversion is allowed from the SEI NAL of the extended video stream; and
adjusting the display luminance in the area in which luminance conversion is allowed, based on the area information.
20. The reception method according to claim 15 , wherein
the HDR conversion characteristic is of at least one of optical-to-electronic conversion and electronic-to-optical conversion.
21. A reception apparatus, comprising: circuitry configured to
receive a video stream;
decode the video stream to obtain high dynamic range (HDR) transmission video data, the video stream including HDR conversion characteristic meta-information that indicates an HDR conversion characteristic and including peak luminance information;
perform HDR electro-optical conversion on the HDR transmission video data based on the HDR conversion characteristic meta-information to obtain video data for display; and
adjust a display luminance of the HDR transmission video data or the converted video data based on the peak luminance information included in the video stream,
wherein the adjustment of the display luminance of the HDR transmission video data and the HDR electro-optical conversion on the HDR transmission video data are separate processes.
22. The reception apparatus according to claim 21 , wherein
the HDR electro-optical conversion and the adjustment of the display luminance are performed in a sequence or at the same time.
23. The reception apparatus according to claim 21 , further comprising:
a display configured to display an image corresponding to the video data.
24. The reception apparatus according to claim 21 , wherein
the HDR conversion characteristic is of at least one of optical-to-electronic conversion and electronic-to-optical conversion.