Coding-independent code points
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Coding-independent code points (CICP) is a way to signal the properties of a video or audio stream.[1] [2] It can describe the color profile of videos (and still images) in a simpler way than the use of ICC profiles.[3] It is defined in both ITU-T H.273 and ISO/IEC 23091-2.[1] It is used by multiple codecs including AVC [citation needed ], HEVC,[citation needed ] VVC, and AVIF.[3]
Standardization
[edit ]- ITU-T H.273, for video.
- ISO/IEC 23001-8:2016, part of MPEG-B (system technologies). Later split into three parts:
- ISO/IEC 23091-1:2018, for systems.
- ISO/IEC 23091-2:2019, for video. (Revised by ISO/IEC 23091-2:2021).
- ISO/IEC 23091-3:2018, for audio.
Common CICP values
[edit ]Common combinations of H.273 parameters are summarized in ITU-T Series H Supplement 19.[4]
| Code point value | Meaning | |
|---|---|---|
| Transfer function | 1, 6, 14, 15 | SDR (Rec. 709) |
| 16 | PQ | |
| 18 | HLG | |
| Color primaries | 1 | Rec. 709, sRGB |
| 5 | Rec. 601 (PAL) | |
| 6 | Rec. 601 (NTSC) | |
| 9 | Rec. 2020, Rec. 2100 | |
| 12 | P3-D65 | |
| Matrix coefficients | 0 | R'G'B' |
| 1 | Y'CbCr (for Rec. 709) | |
| 5, 6 | Y'CbCr (for Rec. 601) | |
| 9 | Y'CbCr (for Rec. 2020, Rec. 2100) | |
| 14 | ICtCp (for Rec. 2100) |
References
[edit ]- ^ a b c "H.273 : Coding-independent code points for video signal type identification". www.itu.int. Archived from the original on 2018年02月04日. Retrieved 2021年09月12日.
- ^ "ISO/IEC 23001-8:2016". ISO. Retrieved 2021年11月11日.
- ^ a b "CICP · AOMediaCodec/libavif Wiki". GitHub. Retrieved 2021年11月06日.
- ^ a b "H.Sup19 : Usage of video signal type code points". www.itu.int. Archived from the original on 2020年03月14日. Retrieved 2021年09月12日.
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