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CE9: Constrained intra prediction with DMVR (test 9.2.4)
Abstract
Decoder side motion vector refinement (DMVR) techniques were proposed to refine the motion vectors at decoder side after parsing stage. As intra prediction may depend on the results of its spatial neighbor’s full reconstruction, it cannot be started until the MV derivation process and the final reconstruction are finished for the neighboring blocks, which leads to serious latency in hardware pipeline. It is reported that the issue can be resolved with the method proposed in this contribution.
JVET-M0447 CE9: Constrained intra prediction with DMVR (test 9.2.4) [M. Xu, X. Li, S. Liu (Tencent)]
This contribution presents DMVR simplifications based on VTM3.0. Firstly, only 4 integer precision surround check for certain condition, followed by MRSAD mean value calculation by sampling process, then use SAD calculation to replace MRSAD. The proposed technologies have 0.71%/ 0.68%, 0.60% gain respectively compared to VTM3.0 anchor.
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Decisions
This contribution presents DMVR simplifications based on VTM3.0. Firstly, only 4 integer precision surround check for certain condition, followed by MRSAD mean value calculation by sampling process, then use SAD calculation to replace MRSAD. The proposed technologies have 0.71%/ 0.68%, 0.60% gain respectively compared to VTM3.0 anchor.
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