JCTVC-J0375 Cross-verification of Modification of context assignment for significance flag coding for large TUs (JCTVC-J0354) [R. Cohen (Mitsubishi)] [late]
JCTVC-J0102 AHG5: Unification of context derivation for coefficient group flag [V. Seregin, J. Sole, M. Karczewicz (Qualcomm)]
Coefficient group flag is coded using bottom and right flags of already processed sub-blocks. However in one case, when transform unit size is 8x8 with horizontal or vertical scanning, only previous coded coefficient group flag is used to derive the context for current group flag. In this contribution, it is proposed to unify those cases by applying the same context derivation method for horizontal and vertical scans as it is used for diagonal scan.
Questionable whether this is a simplification. Actually, in an actual implementation, the conditional checks that are removed from the spec may not be necessary (e.g. they are not implemented this way in the current software).
The scans themselves are not changed. But coefficient groups are slightly changed.
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