Back to Search Document details
17th Meeting: Brussels, January 2020 2020-01-15 17:06
CE3-related: Modification of chroma BDPCM
Authors: Marta Karczewicz Qualcomm H. Wang Qualcomm Alican Nalci Qualcomm Muhammed Coban Qualcomm T. Tsukuba Sony M. Ikeda Sony Y. Yagasaki Sony Teruhiko Suzuki Sony Hyeongmun Jang LGE J.Choi LGE S. Kim LGE J. Lim LGE Hongtao Wang
Abstract
In CE3-2.4, it has been studied that chroma BDPCM is beneficial for the lossless coding of YUV420 materials. This contribution studies the performance of chroma BDPCM for the lossy coding of YUV420 test sequences. The simulation results of chroma BDPCM with the adopted fixes in JVET-Q0110 is reported and chroma BDPCM is proposed to be enabled for the YUV420 color format. Additionally, results are provided after incorporated the bug-fixes in JVET-Q0110 and JVET-Q0351.
Meeting Notes
JVET-Q0785 CE3-related: Modification of chroma BDPCM [M. Karczewicz, H. Wang, A. Nalci, M. Coban (Qualcomm), T. Tsukuba, M. Ikeda, Y. Yagasaki, T. Suzuki (Sony)] [late]

This was presented in Track B Wednesday 15 January at 1645.

In CE3-2.4, it has been studied that chroma BDPCM is beneficial for the lossless coding of YUV 4:2:0 materials. This contribution studies the performance of chroma BDPCM for the lossy coding of YUV 4:2:0 test sequences. The simulation results of chroma BDPCM with the adopted fixes in JVET-Q0110 is reported and chroma BDPCM is proposed to be enabled for the YUV 4:2:0 colour format. Additionally, results are provided after incorporated the bug-fixes in JVET-Q0110 and JVET-Q0351.

This relates to the additional information requested on CE3-2.4.

The results indicate that there is no issue with chroma BDPCM in CTC, and also integrates the known bug fixes. Luma BDPCM is also enabled, which explains the small drop of luma performance in camera video (the CTC anchor is with both luma and chroma BDPCM off).

Decision (CTC+BF/SW): Adopt JVET-Q0785 (the SW includes bug fixes JVET-Q0110 and JVET-Q0351).

The CTC should handle chroma BDPCM 4:2:0 the same as luma (only enabled for screen content).

References:
JVET-P2001 JVET-Q0089 JVET-Q0110 JVET-Q0351
Cited:
JVET-Q0089 JVET-Q0790 X JVET-Q0792 X JVET-R0013 JVET-S0013 JVET-T0013
PATENTS:
US11128876B2 0.87 2021-09-21 20200296390 0.87 20200404324 0.87 AU2020261351B2 0.34 2025-08-14 20210176468 0.34 AU2020235622B2 0.32 2023-08-24 20210084341 0.32 TWI875822B 0.30 2025-03-11
ARCHIVE v4 :
JVET-Q0785-v4.docx Table1_JVET-Q0785-VTM70_with_Q0110_chromaBDPCM.xlsm Table2_JVET-Q0785-VTM70-chromaBDPCM.xlsm Table3_JVET-Q0785-VTM70_with_Q0110_with_Q0351.xlsm
Decisions
The CTC should handle chroma BDPCM 4:2:0 the same as luma (only enabled for screen content).
Citation