JCTVC-J0321 Cross-verification of JCTVC-J0161 Removal of the inference of luma CBF at the transform depth level zero in inter CU [L. Guo (Qualcomm)] [late]
JCTVC-J0241 Simplification on CBF inference and coding [J. Xu (Microsoft)]
(This contribution was presented Sat morning in Track B, not in the context of other TCC contributions; presenter had not been available before.)
At the previous meeting, the inference technique in cbf coding is removed due to the complicated conditions. This document presents a simplified cbf inference condition, which results in 0.0%, 0.0%, −0.1%, −0.1, −0.2%, and −0.2% Y BD Rate changing for AI-Main, AI-HE10, RA-Main, RA-HE10, LB-Main and LB-HE10 respectively. This document also discusses to remove all conditions for coding cbf_luma in case more simplification is more preferable than achieving coding gains.
No action on changing conditions
Decision (SW): Modified encoder decision for CBF=0.
JCTVC-J0157 Cross-check of luma CBF inference proposed by Microsoft [J. Kim (LGE)]
JCTVC-J0303 Simplification on context derivation of cbf_luma syntax element [I.-K. Kim, J. H. Park (Samsung)]
For simplification of the context selection of the cbf_luma syntax element, the maximum transform size checking for cbf_luma is proposed to be removed. The average loss from this simplification is reportedly negligible (0.0%). It is reported that for Class F, there were 0.1% and 0.2% losses in the random access HE10 and low delay B HE10 configurations, respectively.
Several experts expressed support for this as obviously simplifying the design.
Decision: Adopt.
JCTVC-J0376 Cross-check report for Simplification on context derivation of cbf_luma syntax element (JCTVC-J0303) [H. Sasai (Panasonic)] [late]
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