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 tenth meeting during 11-20 July 2012 at the City Conference Centre (ccc), a k. a

JCTVC-J0223 Cross-check of Weighted Prediction Parameter Signalling (JCTVC-J0055) [A. Tanizawa, T. Chujoh (Toshiba)] [late]
JCTVC-J0120 AHG9 & AHG13: Identical reference picture lists [Y. Chen, M. Coban, Y.-K. Wang, M. Karczewicz (Qualcomm)]

In HEVC, for B slices, there are chances when RefPicList0 and RefPicList1 are identical, and when explicit weighted prediction is in use, the prediction weights are also identical. It is proposed to indicate this and thus reduces the bits for signalling RefPicList1 and its prediction weights. It is reported that the proposed algorithm saves about 48% for the number of bits used to signal weighted prediction parameters for the LB case and about 10% for the RA case.

It proposes to send a flag in each slice header of B slices.

This increases overhead whenever the flag is 0 in order to save overhead when the flag is 1.

In discussion, it was noted that a condition could be put at the SPS or PPS level to determine whether the flag is sent.

The overall effect in the CTC is unknown – probably roughly negligible. When WP is used and the modified lists are identical, it would save probably roughly 1-3%.

No action.