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METHODS AND APPARATUS FOR PREDICTION REFINEMENT FOR DECODER SIDE MOTION VECTOR REFINEMENT WITH OPTICAL FLOW
METHODS AND APPARATUS FOR PREDICTION REFINEMENT FOR DECODER SIDE MOTION VECTOR REFINEMENT WITH OPTICAL FLOW
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机译：光学流解码器侧运动矢量精修的预测精修方法和装置
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摘要
Methods, devices, apparatus, systems, architectures and interfaces to improve motion vector (MV) refinement based sub-block (SB) level motion compensated prediction are provided. A decoding method includes receiving a bitstream of encoded video data, the bitstream including at least one block of video data including a plurality of SBs; performing a MV derivation, including a decoder based MV (DMVR) process, for at least one SB in the block to generate a refined MV for each SB; performing SB based motion compensation on the at least one sub-block to generate a SB based prediction within each SB; obtaining a spatial gradient for the prediction within each SB; determining a MV offset for each pixel in each SB; obtaining an intensity change in each SB based on the spatial gradients and MV offsets via an optical flow equation; and refining the prediction within each SB based on the obtained intensity changes.
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