Coding-independent code points
From HandWiki
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] and AVIF.[3]
Standardization
- 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
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
- ↑ 1.0 1.1 1.2 "H.273 : Coding-independent code points for video signal type identification". https://www.itu.int/rec/T-REC-H.273/en.
- ↑ "ISO/IEC 23001-8:2016" (in en). https://www.iso.org/cms/render/live/en/sites/isoorg/contents/data/standard/06/96/69661.html.
- ↑ 3.0 3.1 "CICP · AOMediaCodec/libavif Wiki" (in en). https://github.com/AOMediaCodec/libavif.
- ↑ 4.0 4.1 "H.Sup19 : Usage of video signal type code points". https://www.itu.int/rec/T-REC-H.Sup19/en.
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