IP Library › Granted Patent US 12,375,714
Granted Patent B2
US 12,375,714 · App. 18/490,024 · Granted Jul 29, 2025

Context coding for matrix-based intra prediction

Inventors: Zhipin Deng (Beijing, CN); Kai Zhang (San Diego, CA); Li Zhang (San Diego, CA); Hongbin Liu (Beijing, CN); Jizheng Xu (San Diego, CA)
Assignees: BEIJING BYTEDANCE NETWORK TECHNOLOGY CO., LTD.; BYTEDANCE INC.
H04N19/593H04N19/70
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Quick Facts
Patent No.
US 12,375,714
App. No.
18/490,024
Granted
Jul 29, 2025
Kind
B2
Abstract

Devices, systems, and methods for digital video coding, which includes matrix-based intra prediction methods for video coding, are described. In a representative aspect, a method for video processing includes encoding a current video block of a video using a matrix intra prediction (MIP) mode in which a prediction block of the current video block is determined by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and selectively followed by an upsampling operation; and adding, to a coded representation of the current video block, a syntax element indicative of applicability of the MIP mode to the current video block using arithmetic coding in which a context for the syntax element is derived based on a rule.

Claims (33)

1. A method of processing video data, comprising: determining, for a conversion between a current video block of a video and a bitstream of the video, that a matrix intra prediction (MIP) mode is applied on the current video block based on a syntax element, wherein in the MIP mode, prediction samples of the current video block are determined by performing a boundary down-sampling operation, followed by a matrix vector multiplication operation and an up-sampling operation; and performing the conversion based on the prediction samples, wherein reduced boundary samples are generated from reference boundary samples of the current video block of the video in the boundary down-sampling operation and are used to generate inputs to the matrix vector multiplication operation, wherein in the boundary down-sampling operation, when a downsampled boundary size of the current video block is less than a size of the of the current video block, the reduced boundary samples are generated directly from the reference boundary samples of the current video block and a downscaling factor without deriving intermediate samples, wherein the downscaling factor is calculated based on the size of the current video block, and wherein at least one bin of the syntax element is context coded, and an increment value of the context is determined based on characteristics of a neighboring block of the current video block.

2. The method of claim 1 , wherein the increment value of the context is determined further based on the size of the current video block.

3. The method of claim 2 , wherein in response to a width-height ratio of the current video block being greater than 2, a context with a first predefined increment value is used for coding the at least one bin of the syntax element.

4. The method of claim 2 , wherein in response to a width-height ratio of the current video block being smaller than or equal to 2, a context with a second increment value is used for coding the at least one bin of the syntax element, wherein the second increment value is not identical to a first predefined increment value.

5. The method of claim 4 , wherein the second increment value is selected from an increment value group based on characteristics of the neighboring block.

6. The method of claim 5 , wherein the characteristics of the neighboring block include coding mode of the neighboring block and availability of the neighboring block.

7. The method of claim 6 , wherein a left neighboring video block of the current video block and a top neighboring video block of the current video block are used to select the second increment value.

8. The method of claim 7 , wherein the second increment value is derived based on a following equation:ctxInc=(condL && availableL)+(condA && availableA),wherein condL is a first MIP syntax element of the left neighboring video block of the current video block, wherein condA is a second MIP syntax element of the top neighboring video block of the current video block, wherein availableL and availableA indicate the availability of the left neighboring video block and the top neighboring video block, respectively, and wherein && indicates a logical And operation.

9. The method of claim 1 , wherein the boundary down-sampling operation and the up-sampling operation in the MIP mode are based on the size of the current video block.

10. The method of claim 1 , wherein the downscaling factor is calculated based on a width or height of the current video block and a boundary size value.

11. The method of claim 1 , wherein the MIP mode includes multiple types, and a type index for the current video block is derived excluding referring to type indices of previous video blocks.

12. The method of claim 11 , wherein the type index for the current video block is explicitly included in the bitstream.

13. The method of claim 1 , wherein the conversion includes encoding the current video block into the bitstream.

14. The method of claim 1 , wherein the conversion includes decoding the current video block from the bitstream.

15. 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:

determine, for a conversion between a current video block of a video and a bitstream of the video, that a matrix intra prediction (MIP) mode is applied on the current video block based on a syntax element, wherein in the MIP mode, prediction samples of the current video block are determined by performing a boundary down-sampling operation, followed by a matrix vector multiplication operation and an up-sampling operation; and

perform the conversion based on the prediction samples,

wherein reduced boundary samples are generated from reference boundary samples of the current video block of the video in the boundary down-sampling operation and are used to generate inputs to the matrix vector multiplication operation,

wherein in the boundary down-sampling operation, when a downsampled boundary size of the current video block is less than a size of the of the current video block, the reduced boundary samples are generated directly from the reference boundary samples of the current video block and a downscaling factor without deriving intermediate samples,

wherein the downscaling factor is calculated based on the size of the current video block, and

wherein at least one bin of the syntax element is context coded, and an increment value of the context is determined based on characteristics of a neighboring block of the current video block.

16. The apparatus of claim 15 , wherein the increment value of the context is determined further based on the size of the current video block, and wherein in response to a width-height ratio of the current video block being greater than 2, a context with a first predefined increment value is used for coding the at least one bin of the syntax element, and in response to the width-height ratio of the current video block being smaller than or equal to 2, a context with a second increment value is used for coding the at least one bin of the syntax element, wherein the second increment value is not identical to the first predefined increment value.

17. The apparatus of claim 16 , wherein the second increment value is derived based on a following equation:ctxInc=(condL && availableL)+(condA && availableA),wherein condL is a first MIP syntax element of a left neighboring video block of the current video block, wherein condA is a second MIP syntax element of a top neighboring video block of the current video block, wherein availableL and availableA indicate an availability of the left neighboring video block and the top neighboring video block, respectively, and wherein && indicates a logical And operation.

18. A non-transitory computer-readable storage medium storing instructions that cause a processor to: determine, for a conversion between a current video block of a video and a bitstream of the video, that a matrix intra prediction (MIP) mode is applied on the current video block based on a syntax element, wherein in the MIP mode, prediction samples of the current video block are determined by performing a boundary down-sampling operation, followed by a matrix vector multiplication operation and an up-sampling operation; and perform the conversion based on the prediction samples, wherein reduced boundary samples are generated from reference boundary samples of the current video block of the video in the boundary down-sampling operation and are used to generate inputs to the matrix vector multiplication operation, wherein in the boundary down-sampling operation, when a downsampled boundary size of the current video block is less than a size of the of the current video block, the reduced boundary samples are generated directly from the reference boundary samples of the current video block and a downscaling factor without deriving intermediate samples, wherein the downscaling factor is calculated based on the size of the current video block, and wherein at least one bin of the syntax element is context coded, and an increment value of the context is determined based on characteristics of a neighboring block of the current video block.

19. A method for storing a bitstream of a video, comprising:

determining that a matrix intra prediction (MIP) mode is applied on a current video block of the video based on a syntax element, wherein in the MIP mode, prediction samples of the current video block are determined by performing a boundary down-sampling operation, followed by a matrix vector multiplication operation and an up-sampling operation;

generating the bitstream based on the prediction samples, and

storing the bitstream in a non-transitory computer readable medium,

wherein reduced boundary samples are generated from reference boundary samples of the current video block of the video in the boundary down-sampling operation and are used to generate inputs to the matrix vector multiplication operation,

wherein in the boundary down-sampling operation, when a downsampled boundary size of the current video block is less than a size of the of the current video block, the reduced boundary samples are generated directly from the reference boundary samples of the current video block and a downscaling factor without deriving intermediate samples,

wherein the downscaling factor is calculated based on the size of the current video block, and

wherein at least one bin of the syntax element is context coded, and an increment value of the context is determined based on characteristics of a neighboring block of the current video block.

20. The method of claim 1 , wherein the reference boundary samples include left and above reference boundary samples of the current video block.

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 31, 2023
From: ZHANG, KAI; ZHANG, LI; XU, JIZHENG
To: BYTEDANCE INC.
Reel/Frame 065409/0585 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 31, 2023
From: DENG, ZHIPIN; LIU, HONGBIN
To: BEIJING BYTEDANCE NETWORK TECHNOLOGY CO., LTD.
Reel/Frame 065409/0649 →
Priority Claims (1)
WO PCT/CN2019/085399 · May 1, 2019 · international
Continuity (4)
Continuation 17942552 · Sep 12, 2022
Continuation 17479338 · Sep 20, 2021
Continuation PCTCN2020088583 · May 5, 2020
Related Publication 20240048762A1 · Feb 8, 2024
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US 12,610,037