International organisation for standardisation organisation internationale de normalisation
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Non-normative contributions (4)
(Chaired by A. Vetro) 14.1.1.1.1.1.1.1.166JCT3V-G0079 Improvement on AMP fast mode decision [X. Chen, X. Zheng, Y. Lin, J. Zheng, (Hisilicon)] In this document, we constrained AMP_MRG using condition and test results of asymmetric motion partition (AMP) are provided. Three methods average gain are 0.36%, 0.34% and 0.3% with coding time 3.94%, 2.57% and 1.81% increase, respectively. The method was also proposed for HEVC single layer coding, but has additional benefit for multiview video coding. Currently, there is a fast estimation process to determine the AMP merge mode which incurs coding loss. The proposed method maintains the fast estimation, but does not lose as much. It was considered desirable by one expert to use the same base layer encoding techniques as HM; it was suggested that the method should be proposed to JCT-VC. It was reported later that for the case of HM the encoding runtime increases by 10%, giving a similar gain. For 3D HEVC, it is increasing the encoding runtime by 2%. No action. 14.1.1.1.1.1.1.1.167JCT3V-G0207 Crosscheck for HiSilicon's JCT3V-G0079 [K. Zhang, J. An, X. Zhang (MediaTek)] [late]
Bugfix of VSD (View Synthesis Distortion) calculation is proposed to correct the bitDepth value assignment for VSD calculation. After bugfix, 0.1% BD-bit rate saving is achieved on synthesized view under CTC. Additionally a modification of VSD calculation is proposed and 0.1% BD-bit rate saving on view 1 and view 2, and 0.3% BD-bit rate saving on synthesized view are achieved under CTC. It was remarked that the bug fix seems like an obvious thing to do, and the proposed weighting function appears to provide a good gain. There was a question on whether the function was optimized to the test set – it was not. The same optimization can be applied for both MV-HEVC with depth as well as 3D-HEVC. Offline discussion has taken place to understand technique and confirm cross-check. Experts understand the proposed fix and improvement and support their inclusion in the software. Decision (SW): Adopt. 14.1.1.1.1.1.1.1.169JCT3V-G0211 Crosschecking for Hisilicon's VSD bugfix and improvement, JCT3V-G0163 [X. Zhang, K. Zhang, J. An (MediaTek)] [late]
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