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Coding-independent code points

Summary

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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]

Common CICP values[1][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

  1. ^ a b c "H.273 : Coding-independent code points for video signal type identification". www.itu.int. Archived from the original on 2018-02-04. Retrieved 2021-09-12.
  2. ^ "ISO/IEC 23001-8:2016". ISO. Retrieved 2021-11-11.
  3. ^ a b "CICP · AOMediaCodec/libavif Wiki". GitHub. Retrieved 2021-11-06.
  4. ^ a b "H.Sup19 : Usage of video signal type code points". www.itu.int. Archived from the original on 2020-03-14. Retrieved 2021-09-12.