The Joint Collaborative Team on Video Coding (jct-vc) of itu-t wp3/16 and iso/iec jtc 1/sc 29/wg 11 held its second meeting during 21-28 July, 2010 at the itu-t premises in Geneva, ch

JCTVC-B068 [S. Sekiguchi, Y. Itani (Mitsubishi)] Performance evaluation on implicit direct vector derivation

This proposal is not directly part of TE1 – it is a somewhat different proposal, but on a closely related topic.

This contribution is to report coding performance of spatio-temporal adaptive direct vector derivation for B-skip/B-direct modes without explicit signaling that was proposed in our CfP submission at the last Dresden meeting. With this design, B-skip and B-direct modes do not need to send any side information for locally adaptive direct MV derivation relying on a simple decoder-side decision. A performance evaluation using JCTVC-A124 software, which has been chosen as the code base for TMuC software, was conducted and the result reportedly showed some coding gain. It was proposed to establish tool experiment for this category to identify relevant direct mode design to be included into test model.

The content of the TMuC document and software in regard to this topic seems somewhat unclear.

Average gain reported of approx 2.7% overall for proposal relative to spatial direct mode only. The TMuC software seems to also have some other method in it – disabled by default.

Proponent suggests creating a TE/CE to determine the best design for this aspect.

Consider result of break-out discussion on TMuC software status.