JVET-AC0048 Non-EE: Modification of TIMD [Y. Yasugi, T. Ikai (Sharp)] [late]

Initial version rejected as “placeholder”.

This contribution proposes a modification of template-based intra derivation (TIMD) mode on top of ECM-7.0 software. This modification allows explicit selection of template from three regions; TL, T and L. Experimental results reportedly show BD-rate -0.09% and -0.03% for AI and RA conditions for test a (no block restrictions), respectively.

Gain in AI is 0.07% with block size restriction, no change in RA.

Encoding time increase 19% in AI, 4% in RA.

With this tradeoff, the proposal is not attractive. Only slight increase in encoding time would be acceptable. It was agreed to investigate this in an EE, but it would only be considered when encoding is decreased by a large amount.