Coding mode dependent selection of transform skip mode

Patent metadata

Field	Value
Publication number	US-12598300-B2
Application number	US-202318172129-A
Country	US
Kind code	B2
Filing date	Feb 21, 2023
Priority date	Aug 21, 2020
Publication date	Apr 7, 2026
Grant date	Apr 7, 2026

Abstract

Methods, system and apparatus for video processing are described. One example method of processing video data includes performing a conversion between a current block of a video and a bitstream of the video according to a rule. The rule specifies that whether a transform skip mode is enabled is determined based on coding information of the current block. The transform skip mode is a coding mode in which a transform is skipped on a prediction residual of a video block.

First claim

The invention claimed is:

1 . A method of processing video data, comprising:
performing a conversion between a current block of a video and a bitstream of the video according to a rule, wherein the rule specifies that whether a transform skip mode is applied to the current block is determined based on coding information of the current block, wherein the transform skip mode is a coding mode in which a transform is skipped on a prediction residual of a video block, wherein the coding information includes whether a subblock transform (SBT) is applicable to a coding unit including the current block, whether the current block is coded in an inter mode and whether the current block has a width and a height smaller than a threshold, and wherein the transform skip mode is applied to the current block when the following are met: a value of a higher level enable syntax element indicates that transform skip mode is enabled, the current block has a width and a height smaller than the threshold, the current block is coded in the inter mode and the SBT is applicable to the current block.

2 . The method of claim 1 , wherein the determining is further based on a higher level enable syntax element included in a sequence parameter set.

3 . The method of claim 1 , wherein the determining is further based on a higher level enable syntax element included in a picture header, a sequence header, a picture parameter set, a video parameter set, or a slice header.

4 . The method of claim 1 , wherein the threshold is equal to 64.

5 . The method of claim 1 , wherein the transform skip mode is applied to the current block further when the following are met: a value of a higher level enable syntax element indicates that the transform skip mode is enabled, a coding unit including the current block is not coded in a direct mode, the current block has a width and a height smaller than the threshold, the current block is coded in the inter mode, and the SBT is not applicable to the current block.

6 . The method of claim 1 , wherein the current block is a transform block.

7 . The method of claim 1 , wherein the conversion comprises encoding the video into the bitstream.

8 . The method of claim 1 , wherein the conversion comprises decoding the video from the bitstream.

9 . An apparatus for processing video data comprising a processor and a non-transitory memory with instructions thereon, wherein the instructions upon execution by the processor, cause the processor to:
perform a conversion between a current block of a video and a bitstream of the video according to a rule, wherein the rule specifies that whether a transform skip mode is applied to the current block is determined based on coding information of the current block, wherein the transform skip mode is a coding mode in which a transform is skipped on a prediction residual of a video block, wherein the coding information includes whether a subblock transform (SBT) is applicable to a coding unit including the current block, whether the current block is coded in an inter mode and whether the current block has a width and a height smaller than a threshold, and wherein the transform skip mode is applied to the current block when the following are met: a value of a higher level enable syntax element indicates that transform skip mode is enabled, the current block has a width and a height smaller than the threshold, the current block is coded in the inter mode and the SBT is applicable to the current block.

10 . The apparatus of claim 9 , wherein the determining is further based on a higher level enable syntax element included in a sequence parameter set.

11 . The apparatus of claim 9 , wherein the determining is further based on a higher level enable syntax element included in a picture header, a sequence header, a picture parameter set, a video parameter set, or a slice header.

12 . The apparatus of claim 9 , wherein the threshold is equal to 64.

13 . The apparatus of claim 9 , wherein the transform skip mode is applied to the current block further when the following are met: a value of a higher level enable syntax element indicates that the transform skip mode is enabled, a coding unit including the current block is not coded in a direct mode, the current block has a width and a height smaller than the threshold, the current block is coded in the inter mode, and the SBT is not applicable to the current block.

14 . The apparatus of claim 9 , wherein the current block is a transform block.

15 . A non-transitory computer-readable storage medium storing instructions that cause a processor to:
perform a conversion between a current block of a video and a bitstream of the video according to a rule, wherein the rule specifies that whether a transform skip mode is applied to the current block is determined based on coding information of the current block, wherein the transform skip mode is a coding mode in which a transform is skipped on a prediction residual of a video block, wherein the coding information includes whether a subblock transform (SBT) is applicable to a coding unit including the current block, whether the current block is coded in an inter mode and whether the current block has a width and a height smaller than a threshold, and wherein the transform skip mode is applied to the current block when the following are met: a value of a higher level enable syntax element indicates that transform skip mode is enabled, the current block has a width and a height smaller than the threshold, the current block is coded in the inter mode and the SBT is applicable to the current block.

16 . The non-transitory computer-readable storage medium of claim 15 , wherein the determining is further based on a higher level enable syntax element included in a sequence parameter set.

17 . A non-transitory computer-readable recording medium storing a bitstream of a video which is generated by a method performed by a video processing apparatus, wherein the method comprises:
generating, for a current block of the video, the bitstream of the video according to a rule, wherein the rule specifies that whether a transform skip mode is applied to the current block is determined based on coding information of the current block, wherein the transform skip mode is a coding mode in which a transform is skipped on a prediction residual of a video block, wherein the coding information includes whether a subblock transform (SBT) is applicable to a coding unit including the current block, whether the current block is coded in an inter mode and whether the current block has a width and a height smaller than a threshold, and wherein the transform skip mode is applied to the current block when the following are met: a value of a higher level enable syntax element indicates that transform skip mode is enabled, the current block has a width and a height smaller than the threshold, the current block is coded in the inter mode and the SBT is applicable to the current block.

18 . The non-transitory computer-readable recording medium of claim 17 , wherein the determining is further based on a higher level enable syntax element included in a sequence parameter set.

Assignees

• Beijing Bytedance Network Tech Co Ltd
• Bytedance Inc

Inventors

• Zhang Li
• Zhang Kai
• Zhang Yuhuai
• Liu Hongbin
• Wang Yue
• Ma Siwei

Classifications

• H04N19/105

  Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction · CPC title

• H04N19/70

  characterised by syntax aspects related to video coding, e.g. related to compression standards · CPC title

• H04N19/61

  in combination with predictive coding · CPC title

• H04N19/593

  involving spatial prediction techniques · CPC title

• H04N19/18

  the unit being a set of transform coefficients · CPC title