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11th Meeting: Ljubljana, July 2018 2018-07-17 08:44
AHG11: Palette mode
Authors: Yu-Chen Sun Alibaba J. An Alibaba Jian Lou Alibaba
Abstract
This document proposes a simplified palette mode on top of VTM1.1. For Class F sequences, the results show -2.6%/-1.8%/-0.9% BD-rate luma gain in AI/RA/LDB configuration; for 4:2:0 TGM sequences in CE8, the results show -13.7%/-8.9%/-7.0% BD-rate luma gain in AI/RA/LDB configuration.
Meeting Notes
JVET-K0411 AHG11: Palette mode [Y.-C. Sun, J. An, J. Lou (Alibaba)] [late]

This document proposes a simplified palette mode on top of VTM1.1. For Class F sequences, the results reportedly show 2.6%/1.8%/0.9% BD-rate luma gain in AI/RA/LDB configuration; for 4:2:0 TGM sequences in CE8, the results reportedly show 13.7%/8.9%/7.0% BD-rate luma gain in AI/RA/LDB configuration.

The proposed palette mode is not the same as in HEVC, but rather similar to an earlier version (SCM2).

This was applicable to 4:4:4 and 4:2:0 colour sampling.

The mode is enabled at the CU level (which is now rectangular, whereas it was always square in the case of HEVC.

Small losses were reported for classes A through E.

To be investigated in CE15:

  • The interrelationship with CPR
  • Also investigate the HEVC palette mode
  • The complexity impact of the two palette variants and CPR (V. Seregin offered to help in porting the SCC palette mode to the VTM).
References:
JVET-J1010 JVET-J1028
Cited:
JVET-K0011 JVET-K0475 X JVET-K1035 JVET-L0035 X JVET-L0344
PATENTS:
KR20220101729A 0.34 2022-07-19 CN114830670B 0.32 2023-03-31 US20230217026A1 0.30 2023-07-06 JP6741675B2 0.28 2020-08-19 CN107533691B 0.26 2021-05-25 US11023846B2 0.24 2021-06-01 US11506026B2 0.22 2022-11-22 US10951895B2 0.20 2021-03-16
ARCHIVE v4 :
._JVET-K0411.xlsm ._JVET-K0411_v2.docx ._JVET-K0411_v2.pdf JVET-K0411.xlsm JVET-K0411_v2.docx JVET-K0411_v2.pdf
Decisions
The complexity impact of the two palette variants and CPR (V. Seregin offered to help in porting the SCC palette mode to the VTM).
Citation