5.12.3.3Reference picture list (RPL) and weighted prediction (WP) parameters (8 – done)
JCTVC-J0055 AHG9: Weighted Prediction Parameter Signalling [Yong He, Yan Ye (InterDigital)]
In HEVC draft 7, the explicit Weighted Prediction parameters in B slices are always signalled for both reference picture list 0 and reference picture list 1 after list combination was removed at the 9th JCT-VC meeting. In this contribution, two revised WP parameter signalling methods are proposed. Up to two 1-bit flags are added to pred_weight_table(), with the first 1-bit flag indicating if any WP parameters are signalled for the entire list 1, and the second 1-bit flag indicating if any WP parameters are signalled for a particular entry on list 1. Simulation results reportedly show that, for fade-white sequences, when compared to HM7.0 with weighted prediction being used, the proposed signalling method 1 achieves BD rate of −0.1% and −1.6% for random access main and for low-delay B main, respectively. The proposed signalling method 2 reportedly achieves BD rate of −0.2% for random access main and −1.6% for low delay B main with weighted prediction enabled. Similar RD performance gains are observed for HE10 configurations and for fade-black sequences.
For this proposal, the extra syntax is sent only when weighted prediction is used and the length of the two lists is the same. The only syntax elements gated by the flag are the prediction weight syntax elements.
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