IP Library › Granted Patent US 12,407,812
Granted Patent B2
US 12,407,812 · App. 18/452,736 · Granted Sep 2, 2025

Deriving reference sample positions in video coding

Inventors: Kai Zhang (San Diego, CA); Li Zhang (San Diego, CA); Hongbin Liu (Beijing, CN); Zhipin Deng (Beijing, CN); Jizheng Xu (San Diego, CA); Yue Wang (Beijing, CN)
Assignees: BEIJING BYTEDANCE NETWORK TECHNOLOGY CO., LTD.; BYTEDANCE INC.
H04N19/105H04N19/132H04N19/159H04N19/176H04N19/186H04N19/70
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Quick Facts
Patent No.
US 12,407,812
App. No.
18/452,736
Granted
Sep 2, 2025
Kind
B2
Abstract

An example method of video processing includes determining, for a conversion between a current picture of a video and a coded representation of the video, a position of a reference sample in a reference picture that is associated with the current picture based on a top-left position of a window of a picture. The picture includes at least the current picture or the reference picture, and the window is subject to a processing rule during the conversion. The method also includes performing the conversion based on the determining.

Claims (61)

1. A method of processing video data, comprising:

determining, for a conversion between a video unit of a video and a bitstream of the video, a first syntax element and a second syntax element; and

performing the conversion based on the determining,

wherein the first syntax element and the second syntax element have an equivalent functionality,

wherein the first syntax element is included at a first level in the video unit in the bitstream, and the second syntax element is included at a second level in the video unit different from the first level,

wherein the first level is a picture header and the second level is a slice header, a sequence parameter set or a picture parameter set, or wherein the first level is a slice header and the second level is a sequence parameter set or a picture parameter set,

wherein the first syntax element specifying whether a use of an explicit scaling list is enabled is included in the slice header, and the second syntax element specifying whether the use of the explicit scaling list is enabled is included in the sequence parameter set, and

wherein the first syntax element is not included in the slice header when the second syntax element is not included in the sequence parameter set.

2. The method of claim 1 , wherein the first syntax element specifying whether a coding tool comprising luma mapping and chroma scaling is enabled is included in the slice header, and the second syntax element specifying whether the coding tool is enabled is included in the sequence parameter set, and

wherein the first syntax element is not included in the slice header when the second syntax element is not included in the sequence parameter set.

3. The method of claim 1 , wherein the first syntax element specifying whether adaptive loop filter (ALF) is enabled is included in the slice header, and the second syntax element specifying whether ALF is enabled is included in the sequence parameter set, and

wherein the first syntax element is not included in the slice header when the second syntax element is not included in the sequence parameter set.

4. The method of claim 1 , wherein the first syntax element specifying whether mmvd-fullpel-only is enabled is included in the picture header, and the second syntax element specifying whether mmvd-fullpel-only is enabled is included in the sequence parameter set, and

wherein the first syntax element is not included in the picture header when the second syntax element is not included in the sequence parameter set.

5. The method of claim 1 , wherein whether a third syntax element is included in the sequence parameter set depends on a color format of the sequence parameter set, and wherein the third syntax element specifies whether a joint coding of chroma residuals is enabled.

6. The method of claim 5 , wherein the third syntax element is not included in the sequence parameter set when the color format of the sequence parameter set is 4:0:0, and the third syntax element is included in the sequence parameter set when the color format of the sequence parameter set is 4:2:0, 4:2:2, or 4:4:4.

7. The method of claim 5 , wherein a joint_cbcr_sign_flag is included at a level different from the sequence parameter set in the bitstream when the third syntax element specifies the joint coding of chroma residuals is enabled, and

wherein the joint_cbcr_sign flag is not included in the bitstream when the third syntax element specifies the joint coding of chroma residuals is not enabled.

8. The method of claim 1 , wherein a sps_mts_enabled_flag specifying whether sps_explicit_mts_intra_enabled_flag and sps_explicit_mts_inter_enabled_flag are present is included in the sequence parameter set, and

wherein a fourth syntax element is included in the bitstream to indicate whether multiple transform selection MTS is disabled for all pictures.

9. The method of claim 1 , wherein the conversion includes encoding the video unit into the bitstream.

10. The method of claim 1 , wherein the conversion includes decoding the video unit from the bitstream.

11. 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 video unit of a video and a bitstream of the video, a first syntax element and a second syntax element; and

perform the conversion based on the determining,

wherein the first syntax element and the second syntax element have an equivalent functionality,

wherein the first syntax element is included at a first level in the video unit in the bitstream, and the second syntax element is included at a second level in the video unit different from the first level,

wherein the first level is a picture header and the second level is a slice header, a sequence parameter set or a picture parameter set, or wherein the first level is a slice header and the second level is a sequence parameter set or a picture parameter set,

wherein the first syntax element specifying whether a use of an explicit scaling list is enabled is included in the slice header, and the second syntax element specifying whether the use of the explicit scaling list is enabled is included in the sequence parameter set, and

wherein the first syntax element is not included in the slice header when the second syntax element is not included in the sequence parameter set.

12. The apparatus of claim 11 , wherein the first syntax element specifying whether a coding tool comprising luma mapping and chroma scaling is enabled is included in the slice header, and the second syntax element specifying whether the coding tool is enabled is included in the sequence parameter set, and

wherein the second syntax element is not included in the sequence parameter set when the first syntax element is not included in the slice header.

13. A non-transitory computer-readable storage medium storing instructions that cause a processor to:

determine, for a conversion between a video unit of a video and a bitstream of the video, a first syntax element and a second syntax element;

perform the conversion based on the determining,

wherein the first syntax element and the second syntax element have an equivalent functionality,

wherein the first syntax element is included at a first level in the video unit in the bitstream, and the second syntax element is included at a second level in the video unit different from the first level,

wherein the first level is a picture header and the second level is a slice header, a sequence parameter set or a picture parameter set, or wherein the first level is a slice header and the second level is a sequence parameter set or a picture parameter set,

wherein the first syntax element specifying whether a use of an explicit scaling list is enabled is included in the slice header, and the second syntax element specifying whether the use of the explicit scaling list is enabled is included in the sequence parameter set, and

wherein the first syntax element is not included in the slice header when the second syntax element is not included in the sequence parameter set.

14. The non-transitory computer-readable storage medium of claim 13 , wherein the first syntax element specifying whether a coding tool comprising luma mapping and chroma scaling is enabled is included in the slice header, and the second syntax element specifying whether the coding tool is enabled is included in the sequence parameter set, and

wherein the second syntax element is not included in the sequence parameter set when the first syntax element is not included in the slice header.

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

determining, for a video unit of the video, a first syntax element and a second syntax element;

generating the bitstream based on the determining; and

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

wherein the first syntax element and the second syntax element have an equivalent functionality,

wherein the first syntax element is included at a first level in the video unit in the bitstream, and the second syntax element is included at a second level in the video unit different from the first level,

wherein the first level is a picture header and the second level is a slice header, a sequence parameter set or a picture parameter set, or wherein the first level is a slice header and the second level is a sequence parameter set or a picture parameter set,

wherein the first syntax element specifying whether a use of an explicit scaling list is enabled is included in the slice header, and the second syntax element specifying whether the use of the explicit scaling list is enabled is included in the sequence parameter set, and

wherein the first syntax element is not included in the slice header when the second syntax element is not included in the sequence parameter set.

16. The non-transitory computer-readable recording medium of claim 15 , wherein the first syntax element specifying whether a coding tool comprising luma mapping and chroma scaling is enabled is included in the slice header, and the second syntax element specifying whether the coding tool is enabled is included in the sequence parameter set, and

wherein the first syntax element is not included in the slice header when the second syntax element is not included in the sequence parameter set.

17. The apparatus of claim 11 , wherein the first syntax element specifying whether adaptive loop filter (ALF) is enabled is included is included in the slice header, and the second syntax element specifying whether ALF is enabled is included in the sequence parameter set, and

wherein the first syntax element is not included in the slice header when the second syntax element is not included in the sequence parameter set.

18. The apparatus of claim 11 , wherein the first syntax element specifying whether mmvd-fullpel-only is enabled is included in the picture header, and the second syntax element specifying whether mmvd-fullpel-only is enabled is included in the sequence parameter set, and

wherein the first syntax element is not included in the picture header when the second syntax element is not included in the sequence parameter set.

19. The non-transitory computer-readable storage medium of claim 13 , wherein the first syntax element specifying whether adaptive loop filter (ALF) is enabled is included in the slice header, and the second syntax element specifying whether ALF is enabled is included in the sequence parameter set, and

wherein the first syntax element is not included in the slice header when the second syntax element is not included in the sequence parameter set.

20. The non-transitory computer-readable storage medium of claim 13 , wherein the first syntax element specifying whether mmvd-fullpel-only is enabled is included in the picture header, and the second syntax element specifying whether mmvd-fullpel-only is enabled is included in the sequence parameter set, and

wherein the first syntax element is not included in the picture header when the second syntax element is not included in the sequence parameter set.

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 24, 2023
From: ZHANG, KAI; ZHANG, LI; XU, JIZHENG
To: BYTEDANCE INC.
Reel/Frame 064694/0886 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Aug 24, 2023
From: LIU, HONGBIN; DENG, ZHIPIN; WANG, YUE
To: BEIJING BYTEDANCE NETWORK TECHNOLOGY CO., LTD.
Reel/Frame 064694/0929 →
Priority Claims (3)
WO PCT/CN2019/106671 · Sep 19, 2019 · international
WO PCT/CN2019/107082 · Sep 20, 2019 · international
WO PCT/CN2019/109837 · Oct 5, 2019 · international
Continuity (3)
Continuation 17699021 · Mar 18, 2022
Continuation PCTCN2020116469 · Sep 21, 2020
Related Publication 20230396759A1 · Dec 7, 2023
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