JCTVC-M0370 Non-SCE3: Crosscheck for inferred GRP (IGRP) with reduced motion compensation (JCTVC-M0071) [W. Zhang, Y. Chiu (Intel)] [late] [miss]
JCTVC-M0074 Implicit derivation of weight factor for Generalized Residual Prediction [T. Tsukuba, T. Yamamoto, T. Ikai (Sharp)]
This contribution proposes implicit derivation of weight factor for Generalized Residual Prediction (GRP). A CU level flag is used to signal GRP and the weight factor for each PU is determined based on motion parameters. The method is implemented on SCE3.5 (JCTVC-M0109) software. It is reported that the BD-rate (EL+BL) changes compared to SHM1.0 are −1.4%, −1.5%, −1.8%, −2.8%, −2.7% ,−3.5%, −2.2%, −2.7% and −2.4% for RA 2x, RA 1.5x, RA SNR, LP 2x, LP 1.5x, LP SNR, LB 2x, LB 1.5x and LB SNR cases respectively. It is also reported that the proposed method achieves coding gain by 0.0% to −1.2% compared to SCE3.5 case 1 (one weight case: w=0, 1.0) without increase of encoding/decoding time. It is also reported that the proposed method reduces encoding time by 5.5% to 10.2% compared to SCE3.5 (two weight case: w=0, 0.5, 1.0) without significant coding loss (0.0% to 0.3%) except LP 2x, LP SNR and LB SNR cases (0.5% to 1.0%).
Weight factor determined based on merge flag and inter_pred_idc.
Main benefit is for encoder speedup, but several experts expressed that this might be desirable in context of implementing multi-mode GRP with same complexity as single mode. Further study, possibly in context of simplified GRP methods.
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