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AHG15: Quantization matrix selection based on block area
Abstract
This contribution proposes to change quantization matrix selection for rectangular transform blocks, so that it is based on block area instead of block maximal dimension. This is said to be consistent with other parts of VVC like quantization groups, DMVR, BCW, and expected to derive QMs of rectangular blocks more likely from square-sized QMs.
JVET-P0324 AHG15: Quantization matrix selection based on block area [P. de Lagrange, P. Bordes, K. Naser, E. François (InterDigital)]
This contribution proposes to change quantization matrix selection for rectangular transform blocks, so that it is based on block area instead of block maximal dimension. This is said to be consistent with other parts of VVC like quantization groups, DMVR, BCW, and expected to derive QMs of rectangular blocks more likely from square-sized QMs.
Currently, the spec determines the matrix for non-square blocks from the maximum dimension. The proposal is to use the log-average of the two sizes. It is not proven that this would have benefit.
The simplifications of the spec text are purely editorial.
References:
Cited:
PATENTS:
EP3624449A1
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2020-03-18
US11812021B2
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2023-11-07
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2019-10-23
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2024-01-18
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2011-12-06
EP4591215A1
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2025-07-30
Decisions
The simplifications of the spec text are purely editorial.
Citation