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-B027 [K. Iguchi, A. Ichigaya, Y. Shishikui (NHK), S. Sekiguchi, A. Minezawa (Mitsubishi)] Performance report of iterative adjustment intra prediction

This contribution presents the detailed process of Iterative Adjustment Intra Prediction proposed in JCTVC-A122 and experimental results. JM 16.2 with the proposed prediction tool achieves approximately 0.7%, 1.8% and 1.8% bit-saving on average for Y, U and V signal respectively under the alpha anchor conditions with intra only coding.

Iterative adjustment is done by loop: Take reconstruction of L-shaped neighborhood/initialise current block by mean value of neighboring blocks -> DCT/zero-setting of high-frequency coefficients/IDCT (next iteration uses original reconstructed values of neighborhood again).

Maximum iteration number is 10 for 16x16, 4 for 4x4 blocks. Significant increase in complexity, contributor mentions "several times" computation time for encoder, but unclear how much at decoder.

Results with JM16. For classes A, B and super-resolution (8Kx4K sequences) luma BD gain is 1% on average, for lower resolution classes C-E 0.5%.

Contribution noted.