Sub-block MV inheritance between color components
地域：
Beijing
摘要
Devices, systems and methods for sub-block based prediction are described. In a representative aspect, a method for video processing includes partitioning a first component of a current video block into a first set of sub-blocks and partitioning a second component of the current video block into a second set of sub-blocks. A sub-block of the second component corresponds to one or more sub-blocks of the first component. The method also includes deriving, based on a color format of the current video block, motion vectors for a sub-block of the second component based on motion vectors for one or more corresponding sub-blocks of the first color component.
說明書
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wherein off and s are integers, and wherein >> represents a shift operation. The method 1300 or 1400 also includes applying a factor to the intermediate set of motion vectors to obtain the derived motion vectors, wherein the factor is associated with the color format.
In some implementations, the sub-block of the second component corresponds to four sub-blocks of the first component. The four sub-blocks have motion vectors MV0=(MV0x, MV0y), MV1=(MV1x, MV1y), MV2=(MV2x, MV2y) and MV3=(MV3x, MV3y) respectively. The method 1300 or 1400 includes calculating an intermediate set of motion vectors MV*=(MV*x, MV*y) as MV*x=SignShift(MV′x+MV″x, 1) and MV*y=SignShift(MV′y+MV″y, 1), wherein MV′x=SignShift(MV0x+MV2x,1), MV′y=SignShift(MV0y+MV2y, 1), MV″x=SignShift(MV1x+MV3x, 1), and MV″y=SignShift(MV1y+MV3y, 1), wherein
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