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-B063 [T. Yamamoto, Y. Yasugi (Sharp)] Flexible representation of intra prediction modes

In this contribution, FDMR (Flexible Directional Mode Representation) is introduced as a novel intra prediction mode representation. The functionalities achieved by introducing FDMR are (1) simple probable mode derivation process, (2) use of the rank order of the intra prediction modes in the probable mode derivation process, and (3) use of more than one probable mode. Those functionalities provide flexibility and extensibility as well as the increase of coding efficiency.

Idea to derive intra prediction modes at the decoder side e.g. by analysis of the modes used in the neighborhood. Use 2 "probable modes" when many candidates or at least two with same probability exist; Usage of the derivation is signaled, otherwise the usual mode encoding in performed. Adaptation of "probable mode" derivation also possible by encoding the mode rank order.

Average gain in case of sending the rank order is 0.3 % for case of 2 probable modes and mode rank encoding are used.

Contribution noted.