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Sub-block MV inheritance between color components

專利號
US11659192B2
公開日期
2023-05-23
申請人
Beijing Bytedance Network Technology Co., Ltd.; Bytedance Inc.（CN Beijing US CA Los Angeles）
發(fā)明人
Kai Zhang; Li Zhang; Hongbin Liu; Yue Wang
IPC分類
H04N19/52; H04N19/176; H04N19/186; H04N19/55; H04N19/119; H04N19/136
技術(shù)領(lǐng)域
mv,motion,signshift,sub,mv0x,mv1x,mv0y,vectors,cu,mv1y
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

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=Shift(MV0x+MV1x+MV2x+MV3x, 2) and MV*y=Shift(MVy0+MVy1+MVy2+MVy3,2), wherein Shift(x, s)=(x+off)>>s, wherein off and s are integers, and wherein >> represents a right 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 comprises calculating an intermediate set of motion vectors MV*=(MV*x, MV*y) as MV*x=SignShift(MV0x+MV1x+MV2x+MV3x, 2) and MV*y=SignShift(MV0y+MV1y+MV2y+MV3y, 2), wherein

SignShift ? ? ( x , s ) = {

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