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16th Meeting: Geneva, October 2019 2019-10-01 17:44
CE7-4.1: Coding of chroma cbf flags
Authors: S. Esenlik Huawei Biao Wang Huawei Anand Meher Kotra Huawei Han Gao Huawei Elena Alshina Huawei Semih Esenlik
Abstract
The current contribution proposes an alternative way of coding the coded block flags for Cb and Cr blocks. Based on the statistical observation, a first flag (tu_cbf_cb_or_cr) indicating whether Cb or Cr blocks have residual, and a second flag (tu_cbf_cb_and_cr) indicating that both Cb and Cr blocks have residual are included in the syntax. The joint CbCr residual flag will be signalled when tu_cbf_cb_or_cr flag is true.
Meeting Notes
JVET-P0049 CE7-4.1: Coding of chroma cbf flags [S. Esenlik, B. Wang, A. M. Kotra, H. Gao, E. Alshina (Huawei)]

This contribution proposes an alternative way of coding the coded block flags for Cb and Cr blocks. Based on the statistical observation, a first flag (tu_cbf_cb_or_cr) indicating whether Cb or Cr blocks have residual, and a second flag (tu_cbf_cb_and_cr) indicating that both Cb and Cr blocks have residual are included in the syntax. The joint CbCr residual flag will be signalled when tu_cbf_cb_or_cr flag is true.

The objective results according to CTC with the above cbf coding scheme are as follows:

Config. Y U V EncT DecT (8Y+U+V)/10

AI 0.08% -0.67% -0.48% 103% 103% -0.05%

RA 0.14% -1.15% -1.39% 103% 102% -0.14%

LDB 0.03% -0.41% -2.08% 103% 102% -0.23%

Cited:
JVET-P0027 X
PATENTS:
WO2021061023A1 0.34 2021-04-01 JP2023162243A 0.32 2023-11-08 EP3158753A1 0.30 2017-04-26 CA3126304C 0.28 2025-11-25 CN113785574B 0.26 2022-10-11 HK40055504A 0.26 2022-03-11 HK40055504B 0.24 2025-01-03 WO2025008311A1 0.22 2025-01-09
ARCHIVE v3 :
JVET-P0049-r2.docx JVET-P0049_CTC.xlsm JVET-P0049_HDR.xlsm JVET-P0049_lowQP.xlsm JVET-P0049_modifiedLambda.xlsm
Decisions
LDB0.03%-0.41%-2.08%103%102%-0.23%
Citation