Data generation method, data reproduction method, data generation device and data reproduction device
A data generation method is for generating video data that covers a second luminance dynamic range wider than a first luminance dynamic range and has reproduction compatibility with a first device that does not support reproduction of video having the second luminance dynamic range and supports reproduction of video having the first luminance dynamic range, and includes: generating a video signal to be included in the video data using a second OETF; storing, into VUI in the video data, first transfer function information for identifying a first OETF to be referred to by the first device when the first device decodes the video data; and storing, into SEI in the video data, second transfer function information for identifying a second OETF to be referred to by a second device supporting reproduction of video having the second luminance dynamic range when the second device decodes the video data.
1. A data generation method, performed by a data generation device, comprising:
generating video data according to an Advanced Video Coding (AVC) standard and a second opt-electrical transfer function (OETF), an intensity of light within a second range being input into the second OETF;
storing video usability information (VUI) including a first value indicating a first OETF; and
storing supplemental enhancement information (SEI) including a second value indicating the second OETF, wherein
the first OETF supports a first range of an input intensity of light and the second range is wider than the first range,
the first value is to be referred to by a decoding device that does not support the second OETF,
the second OETF is a combination of a square root function and a logarithmic function,
the SEI is provided in a multiplexing layer other than a video coding layer, and
the second OETF has compatibility with the first OETF.
2. The data generation method according to claim 1 ,
wherein the first range and the second range correspond to a first luminance range and a second luminance range, respectively, and
wherein the second luminance range is wider than the first luminance range.
3. The data generation method according to claim 1 , wherein the video data has compatibility such that the decoding device reproduces the video data based on the first OETF.
4. The data generation method according to claim 1 , wherein the second value is referred to by another decoding device that supports the first OETF and the second OETF.
5. A decoding device comprising:
a receiver configured to receive video data generated according to an Advanced Video Coding (AVC) standard and a second opt-electrical transfer function (OETF), an intensity of light within a second range being input into the second OETF; and
a decoding circuit configured to decode the video data, wherein
the receiver is further configured to receive:
video usability information (VUI) including a first value indicating a first OETF; and
supplemental enhancement information (SEI) including a second value indicating the second OETF,
the first OETF supports a first range of an input intensity of light and the second range is wider than the first range,
the first value is to be referred to by the decoding device that does not support the second OETF,
the second OETF is a combination of a square root function and a logarithmic function,
the SEI is provided in a multiplexing layer other than a video coding layer, and
the second OETF has compatibility with the first OETF.