JCTVC-M0319 Cross-check of JCTVC-M0062 on inter-layer residual prediction with motion prediction [H. Yang (Huawei)]
JCTVC-M0071 Non-SCE3: Inferred GRP (IGRP) with reduced motion compensation [X. Wei, J. Zan (Huawei)]
This contribution presents an inferred GRP (IGRP) algorithm based on rqt_root_cbf flag to reduce complexity of generalized residual prediction (GRP). Test results report that average 13.0% of encoding time saving and 0.7% of decoding time saving are achieved. The average BD-rate losses are 0.2% (Y), 0.2% (U) and 0.2% (V). An additional test reports that extra motion compensation introduced by GRP is reduced by 11.7% on average.
Comparison is made against fast GRP from SCE3.3 case 4, against which the average complexity is slightly decreased. That indicates a slight simplification, due to the fact that weight 0 is chosen more frequently by the encoder, and no motion comp is performed in such a case. Worst case would be the same (as there is no guarantee that the encoder would always use the mode from which weight 0 is inferred.
SCE3.3 case 4 was on average around 12% higher in memory accesses than the anchor, which could be brought down to 10% by this proposal.
Proponents should confer with the proponents of simplified GRP methods (JCTVC-M0222, JCTVC-M0275) to identify whether these restrictions could be beneficial – and if yes, include this in the CE.
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