IP Library › Granted Patent US 12,328,432
Granted Patent B2
US 12,328,432 · App. 17/939,717 · Granted Jun 10, 2025

Implicit multiple transform set signaling in video coding

Inventors: Li Zhang (San Diego, CA); Kai Zhang (San Diego, CA); Yuhuai Zhang (Beijing, CN); Hongbin Liu (Beijing, CN); Yue Wang (Beijing, CN); Siwei Ma (Beijing, CN)
Assignees: BEIJING BYTEDANCE NETWORK TECHNOLOGY CO., LTD.; BYTEDANCE INC.
H04N19/136H04N19/105H04N19/176
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Quick Facts
Patent No.
US 12,328,432
App. No.
17/939,717
Granted
Jun 10, 2025
Kind
B2
Abstract

Methods, system and apparatus for video processing are described. One example video processing method includes determining, for a conversion between a current video block of a video and a bitstream of the video, a usage of an identity transform mode for the conversion of the current video block according to a rule. The rule specifies that the usage is based on representative coefficients of one or more representative blocks of the video. The method also includes performing the conversion based on the determining.

Claims (38)

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, a usage of an implicitly selected transform skip mode for the conversion of the current video block according to a rule, wherein the rule specifies that the usage is based on a number of representative coefficients in the current video block; and

performing the conversion based on the determining,

wherein in the implicitly selected transform skip mode, a prediction residual between the current video block and a reference video block is presented in the bitstream without applying a transformation, and

wherein the usage of the implicitly selected transform skip mode for the current video block is based on a parity of the number of the representative coefficients.

2. The method of claim 1 , wherein the implicitly selected transform skip mode is used at least based on that the number of the representative coefficients is an even value, and the implicitly selected transform skip mode is not used in response to the number of the representative coefficients being an odd value.

3. The method of claim 1 , wherein the usage of the implicitly selected transform skip mode is further based on coding information of the current video block.

4. The method of claim 3 , wherein the coding information comprises at least one of a prediction mode, a block dimension, or a flag at a picture header indicating whether the transform skip mode is enabled.

5. The method of claim 4 , wherein the implicitly selected transform skip mode is used at least based on that the block dimension satisfies that a width and a height of the current video block is smaller than or equal to a threshold.

6. The method of claim 5 , wherein the threshold is equal to 32.

7. The method of claim 4 , wherein the implicitly selected transform skip mode is used at least based on that the prediction mode of the current video block is an intra-block-copy coding mode, an intra coding mode or an inter coding mode.

8. The method of claim 1 , wherein the implicitly selected transform skip mode is only applied to a luma video block and is not applied to a chroma video block.

9. The method of claim 1 , wherein the representative coefficients are even coefficients in the current video block.

10. The method of claim 1 , wherein the usage of the implicitly selected transform skip mode for the current video block is further based on whether a zero-out operation is applied.

11. The method of claim 10 , wherein a zero-out range of the zero-out operation is set to outside of a top-left K*L sub-region of the current video block, wherein K is set to min (T1, W) and L is set to min (T2, H) wherein W and H are a block width and a block height for the current video block, respectively, and T1 and T2 are equal to 16.

12. The method of claim 11 , wherein a bottom-right position (SRx, SRy) of a scan region of a scan region based coefficient coding (SRCC) tool for the current video block is located within the K*L sub-region.

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

14. The method of claim 1 , wherein the conversion comprises decoding the video 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, a usage of an implicitly selected transform skip mode for the conversion of the current video block according to a rule, wherein the rule specifies that the usage is based on a number of representative coefficients in the current video block; and

perform the conversion based on the determining,

wherein in implicitly selected the transform skip mode, a prediction residual between the current video block and a reference video block is presented in the bitstream without applying a transformation, and

wherein the usage of the implicitly selected transform skip mode for the current video block is based on a parity of the number of the representative coefficients.

16. The apparatus of claim 15 ,

wherein the implicitly selected transform skip mode is used at least based on that the number of the representative coefficients is an even value, and the implicitly selected transform skip mode is not used in response to the number of the representative coefficients being an odd value.

17. 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, a usage of an implicitly selected transform skip mode for the conversion of the current video block according to a rule, wherein the rule specifies that the usage is based on a number of representative coefficients in the current video block; and

perform the conversion based on the determining,

wherein in the implicitly selected transform skip mode, a prediction residual between the current video block and a reference video block is presented in the bitstream without applying a transformation, and

wherein the usage of the implicitly selected transform skip mode for the current video block is based on a parity of the number of the representative coefficients.

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

determining, for a current video block of the video, a usage of an implicitly selected transform skip mode for the current video block according to a rule, wherein the rule specifies that the usage is based on a number of representative coefficients in the current video block;

generating the bitstream based on the determining; and

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

wherein in the implicitly selected transform skip mode, a prediction residual between the current video block and a reference video block is presented in the bitstream without applying a transformation, and

wherein the usage of the implicitly selected transform skip mode for the current video block is based on a parity of the number of the representative coefficients.

19. The method of claim 18 ,

wherein the implicitly selected transform skip mode is used at least based on that the number of the representative coefficients is an even value, and the implicitly selected transform skip mode is not used in response to the number of the representative coefficients being an odd value.

Assignments (4)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 9, 2023
From: ZHANG, LI; ZHANG, KAI
To: BYTEDANCE INC.
Reel/Frame 062635/0939 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 9, 2023
From: MA, SIWEI
To: BEIJING BYTEDANCE NETWORK TECHNOLOGY CO., LTD.
Reel/Frame 062636/0207 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 9, 2023
From: BEIJING ZITIAO NETWORK TECHNOLOGY CO., LTD.
To: BEIJING BYTEDANCE NETWORK TECHNOLOGY CO., LTD.
Reel/Frame 062636/0295 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 9, 2023
From: ZHANG, YUHUAI; LIU, HONGBIN; WANG, YUE
To: BEIJING ZITIAO NETWORK TECHNOLOGY CO., LTD.
Reel/Frame 062688/0121 →
Priority Claims (1)
WO PCT/CN2020/078334 · Mar 7, 2020 · international
Continuity (2)
Continuation PCTCN2021079495 · Mar 8, 2021
Related Publication 20230017146A1 · Jan 19, 2023
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Panusopone K., et al., “Simplification of MV Storage for Blending Blocks in Triangle Mode,” Joint Video Experts Team (JVET) of ITU-T SG 16 WP 3 and ISO/IEC JTC 1/SC 29/WG 11, 15th Meeting: Gothenburg, SE, Jul. 3-12, 201… [cited by applicant]
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Sethuraman S., “CE9: Results of DMVR Related Tests CE9.2.1 and CE9.2.2,” Joint Video Experts Team (JVET) of ITU-T SG 16 WP 3 and ISO/IEC JTC 1/SC 29/WG 11, 13th Meeting: Marrakech, MA, Jan. 9-18, 2019, Document: JVET-M0… [cited by applicant]
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Yang H., et al., “CE4: Summary Report on Inter Prediction and Motion Vector Coding,” Joint Video Experts Team (JVET) of ITU-T SG 16 WP 3 and ISO/IEC JTC 1/SC 29/WG 11, 14th Meeting: Geneva, CH, Mar. 19-27, 2019, Documen… [cited by applicant]
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Zhang K., et al., “Non-CE4: Cleanups on Syntax Design for Sub-Block Coding Tools,” Joint Video Experts Team (JVET) of ITU-T SG 16 WP 3 and ISO/IEC JTC 1/SC 29/WG 11 15th Meeting: Gothenburg, SE, Jul. 3-12, 2019, Documen… [cited by applicant]
Zhang L., et al., “CE4: History-Based Motion Vector Prediction (Test 4.4.7),” Joint Video Experts Team (JVET) of ITU-T SG 16 WP 3 and ISO/IEC JTC 1/SC 29/WG 11, 12th Meeting: Macao, CN, Oct. 3, 2018-Oct. 12, 2018, Docum… [cited by applicant]
Zhang L., et al., “CE4: History-Based Motion Vector Prediction (Test 4.4.7),” Joint Video Experts Team (JVET) of ITU-T SG 16 WP 3 and ISO/IEC JTC 1/SC 29/WG 11 12th Meeting: Macao, CN, Oct. 3-12, 2018, Document: JVET-L0… [cited by applicant]
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Chiang M-S., et al., “CE10.1.1: Multi-hypothesis Prediction for Improving AMVP Mode, Skip or Merge Mode, and Intra Mode,” Joint Video Experts Team (JVET) of ITU-T SG 16 WP 3 and ISO/IEC JTC 1/SC 29/WG 11 12th Meeting: M… [cited by applicant]
Chiang M-S., et al., “CE10.1.1: Multi-Hypothesis Prediction for Improving AMVP Mode, Skip or Merge Mode, and Intra Mode,” Joint Video Experts Team (JVET) of ITU-T SG 16 WP 3 and ISO/IEC JTC 1/SC 29/WG 11, 12th Meeting: … [cited by applicant]
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Deng Z., et al., “Non-CE6: Cleanups of Maximum Transform Size Related Syntax Elements,” Joint Video Experts Team (JVET) of ITU-T SG 16 WP 3 and ISO/IEC JTC 1/SC 29/WG 11, 16th Meeting: Geneva, CH, Oct. 1-11, 2019, Docum… [cited by applicant]
Document: JVET-O0288-v1, Chubach, O., et al., “CE5-related: On the syntax constraints of ALF APS,” Joint Video Experts Team (JVET) of ITU-T SG 16 WP 3 and ISO/IEC JTC 1/SC 29/WG 11 15th Meeting: Gothenburg, SE, Jul. 3-1… [cited by applicant]
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