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Non-CE6: LFNST signalling
Abstract
VVC uses a CU-level signalling of LFNST, sent after the residual when last positions of the TBs indicate all significant coefficients are subject to secondary transformation. When chroma separate tree (CST) is disabled in I slices, and in P or B slices, this results in the signalling applying both to luma and chroma TBs of a CU. This contribution proposes separate luma and chroma control of LFNST when CST is not in use. Coding performance results of this are AI: x.xx%, x.xx%, x.xx%, in Y, Cb, and Cr components, respectively.
JVET-P0266 Non-CE6: LFNST signalling [C. Rosewarne, J. Gan (Canon)]
VVC uses a CU-level signalling of LFNST, sent after the residual when last positions of the TBs indicate all significant coefficients are subject to secondary transformation. When chroma separate tree (CST) is disabled in I slices, and in P or B slices, this results in the signalling applying both to luma and chroma TBs of a CU. This contribution proposes separate luma and chroma control of LFNST when CST is not in use. Coding performance results of this are AI: x.xx%, x.xx%, x.xx%, in Y, Cb, and Cr components, respectively. Note: x.xx = values not provided in contribution.
Separate signalling for luma and chroma. No obvious benefit was observed from the results, and it had a very slow encoder.
No need for action was determined.
References:
Cited:
PATENTS:
US20240236377A1
0.34
2024-07-11
AU2019275553B2
0.32
2022-10-06
US12477128B2
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2025-11-18
CA3150554A1
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2021-03-25
AU2019275552B2
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2022-10-13
US20240073431A1
0.24
2024-02-29
EP4154530A1
0.22
2023-03-29
WO2022213140A1
0.20
2022-10-13
Decisions
No need for action was determined.
Citation