JCTVC-M0364 Non-SCE1: Cross-check of chroma-like coding of enhancement layer luma intra mode in SHVC (JCTVC-M0285) [E. François (Canon)] [late]
JCTVC-M0290 Non-SCE1: Complexity reduction in intra prediction of enhancement layer in SHVC [C. Auyeung, J. Xu (Sony)]
In this contribution, intra prediction of enhancement layer is proposed to be modified to reduce computational complexity while the coding efficiency stays no change. In intra prediction of HEVC, there are filtering process for reference samples depending on intra mode, and filtering of predicted samples for DC, Horizontal and Vertical modes. This contribution proposes to remove these extra filtering operations to reduce complexity. Experimental results reportedly show that there is a (negligible) improvement in coding efficiency.
It was asked whether there is a subjective effect of removal of these filtering operations. A participant said that there seemed to be no subjective impact for a similar proposal. It was noted that most regions use TextureRL, which is unaffected.
It was asked whether introducing this extra variation is desirable – even if simpler when applied, and the proponent indicated that the variant may already be mostly in an existing implementation, since chroma does not use this filtering. A participant remarked that this processing is not a significant part of the processing, so it may be better to just maintain consistency with the BL design.
The proponent indicated that the same concept applies to difference-domain intra prediction. It was remarked that L0294 and M0331 have similar suggestion for difference-domain intra prediction.
For further study.
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