Overlapped block motion compensation for inter prediction

Patent metadata

Field	Value
Publication number	US-12470733-B2
Application number	US-202318474477-A
Country	US
Kind code	B2
Filing date	Sep 26, 2023
Priority date	Mar 29, 2021
Publication date	Nov 11, 2025
Grant date	Nov 11, 2025

Abstract

A method for video decoding is provided. The method includes obtaining a plurality of sub-blocks within an affine coding unit (CU) of a video frame, where the plurality of sub-blocks include a plurality of boundary sub-blocks and a plurality of non-boundary sub-blocks. Further, the method may include applying both overlapped block motion compensation (OBMC) and affine secondary prediction (ASP) to at least one sub-block to generate a sub-block-based prediction for the affine CU or enabling the ASP for the plurality of non-boundary sub-block and disabling the OBMC for the plurality of non-boundary sub-blocks.

First claim

What is claimed is:

1 . A method for video decoding, comprising:
obtaining a plurality of sub-blocks within an affine coding unit (CU) of a video frame, wherein the plurality of sub-blocks comprise a plurality of boundary sub-blocks and a plurality of non-boundary sub-blocks; and enabling affine secondary prediction (ASP) for the plurality of non-boundary sub-blocks and disabling overlapped block motion compensation (OBMC) for the plurality of non-boundary sub-blocks.

2 . The method of claim 1 , further comprising:
enabling the OBMC for the plurality of boundary sub-blocks and disabling the ASP for the plurality of boundary sub-blocks.

3 . The method of claim 1 , further comprising:
disabling the OBMC for the plurality of boundary sub-blocks.

4 . The method of claim 1 , wherein when the ASP is enabled for a sub-block, the OBMC is disabled for the sub-block.

5 . The method of claim 1 , further comprising:
in response to determining that the ASP is not applied for a sub-block, enabling the OBMC for the sub-block.

6 . The method of claim 1 , wherein each of the plurality of sub-blocks has a block size of 8×8 or 4×4.

7 . An apparatus for video decoding, comprising:
one or more processors; and a memory configured to store instructions executable by the one or more processors, wherein the one or more processors, upon execution of the instructions, are configured to perform operations comprising: obtaining a plurality of sub-blocks within an affine coding unit (CU) of a video frame, wherein the plurality of sub-blocks comprise a plurality of boundary sub-blocks and a plurality of non-boundary sub-blocks; and enabling affine secondary prediction (ASP) for the plurality of non-boundary sub-blocks and disabling overlapped block motion compensation (OBMC) for the plurality of non-boundary sub-blocks.

8 . The apparatus of claim 7 , wherein the one or more processors are further configured to perform:
enabling the OBMC for the plurality of boundary sub-blocks and disabling the ASP for the plurality of boundary sub-blocks.

9 . The apparatus of claim 7 , wherein the one or more processors are further configured to perform:
disabling the OBMC for the plurality of boundary sub-blocks.

10 . The apparatus of claim 7 , wherein when the ASP is enabled for a sub-block, the OBMC is disabled for the sub-block.

11 . The apparatus of claim 7 , wherein the one or more processors are further configured to perform:
in response to determining that the ASP is not applied for a sub-block, enabling the OBMC for the sub-block.

12 . The apparatus of claim 7 , wherein each of the plurality of sub-blocks has a block size of 8×8 or 4×4.

13 . A non-transitory computer readable storage medium storing computer-executable instructions that, when executed by one or more computer processors, causes the one or more computer processors to perform a method comprising:
obtaining a plurality of sub-blocks within an affine coding unit (CU) of a video frame, wherein the plurality of sub-blocks comprise a plurality of boundary sub-blocks and a plurality of non-boundary sub-blocks; and enabling affine secondary prediction (ASP) for the plurality of non-boundary sub-blocks and disabling overlapped block motion compensation (OBMC) for the plurality of non-boundary sub-blocks.

14 . The non-transitory computer readable storage medium of claim 13 , wherein the method further comprises:
enabling the OBMC for the plurality of boundary sub-blocks and disabling the ASP for the plurality of boundary sub-blocks.

15 . The non-transitory computer readable storage medium of claim 13 , wherein the method further comprises:
disabling the OBMC for the plurality of boundary sub-blocks.

16 . The non-transitory computer readable storage medium of claim 13 , wherein when the ASP is enabled for a sub-block, the OBMC is disabled for the sub-block.

17 . The non-transitory computer readable storage medium of claim 13 , wherein the method further comprises:
in response to determining that the ASP is not applied for a sub-block, enabling the OBMC for the sub-block.

18 . The non-transitory computer readable storage medium of claim 13 , wherein each of the plurality of sub-blocks has a block size of 8×8 or 4×4.

Assignees

• Beijing Dajia Internet Information Tech Co Ltd

Inventors

• Xiu Xiaoyu
• Kuo Che-Wei
• Chen Wei
• Chen Yi-Wen
• Jhu Hong-Jheng
• Wang Xianglin
• Yu Bing

Classifications

• H04N19/176

  the region being a block, e.g. a macroblock · CPC title

• H04N19/583

  Motion compensation with overlapping blocks · CPC title

• H04N19/54

  using feature points or meshes · CPC title

• H04N19/44 Primary

  Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder · CPC title

• H04N19/119 Primary

  Adaptive subdivision aspects, e.g. subdivision of a picture into rectangular or non-rectangular coding blocks · CPC title