JVET-C0054 Grouped signalling for transform in QTBT [X. Zhao, V. Seregin, A. Said, M. Karczewicz (Qualcomm)]

This contribution presents a grouping method for transform-related syntax elements. It is applied to the QTBT framework, where an EMT flag is signalled for the group of blocks. The block area size, at which signalling happens, can be configured; the size of the area is sent in the slice header. After the EMT flag is signalled for the area, the blocks included into the area will share the same signalled EMT flag value. Simulation results reportedly show 0.2% luma BD rate saving for All Intra (AI) configuration on average.

This has a small modification in signalling. It was agreed to include it in an EE on primary transform (see under C0022).

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