Granted Patent B2

US 12,262,019 · App. 18/367,976 · Granted Mar 25, 2025

Inventors: Samruddhi Yashwant Kahu (Laguna Hills, CA); Xin Zhao (San Jose, CA); Shan Liu (San Jose, CA)

Assignee: Tencent America LLC

H04N19/132H04N19/117H04N19/172H04N19/176H04N19/186H04N19/1887H04N19/80

Abstract

Claims (59)

1. A method of video processing in a decoder, comprising:

receiving coded information from a coded video bitstream, the coded information being indicative of applying cross-component sample offset (CCSO) with adaptive bands;

determining at least a first band width for a first band and a second band width for a second band, the first band width being different from the second band width;

determining, for a current block in a current picture, at least a first offset associated with the first band and a second offset associated with the second band;

categorizing reconstructed samples of a first color component in the current block into at least the first band and the second band based on the first band width of the first band and the second band width of the second band, the first band comprising first reconstructed samples of the first color component and the second band comprising second reconstructed samples of the first color component, the first reconstructed samples of the first color component collocating with first reconstructed samples of a second color component in the current block, the second reconstructed samples of the first color component collocating with second reconstructed samples of the second color component in the current block; and

applying at least the first offset to the first reconstructed samples of the second color component and the second offset to the second reconstructed samples of the second color component to generate CCSO compensated samples of the second color component.

2. The method of claim 1 , wherein the determining at least the first band width for the first band and the second band width for the second band further comprises:

decoding at least the first band width from the coded information.

3. The method of claim 2 , wherein the coded information comprises each of at least the first band width and the second band width that are coded by a fixed length code word.

4. The method of claim 2 , further comprising:

decoding at least a first difference value and a second difference value from the coded information;

determining the second band width by combining the first band width and the first difference value; and

determining a third band width for a third band by combining the first band width and the second difference value.

5. The method of claim 2 , further comprising:

decoding at least a first difference value and a second difference value from the coded information;

determining the second band width by combining the first band width and the first difference value; and

determining a third band width for a third band by combining the second band width and the second difference value.

6. The method of claim 2 , further comprising:

decoding, from at least one of a sequence parameter set, a picture header, and a slice header, a syntax element with a value that indicates a number of bits for coding at least the first band width.

7. The method of claim 1 , wherein the determining at least the first band width for the first band and the second band width for the second band further comprises:

decoding difference values respectively associated with at least the first band and the second band from the coded video bitstream; and

combining the difference values with corresponding band widths of a previous picture to determine at least the first band width for the first band and the second band width for the second band.

8. The method of claim 1 , wherein the current picture is at least one of:

a first frame in a video sequence that is coded in the coded video bitstream;

a key frame in the video sequence; and

a frame with a temporary layer satisfying a requirement.

9. The method of claim 1 , further comprising:

decoding, from at least one of a sequence parameter set, a picture header, and a slice header, a syntax element with a value that indicates whether the adaptive bands being applied with the CCSO.

10. The method of claim 1 , wherein the coded information indicates to apply the CCSO with the adaptive bands for all frames in a video sequence.

11. The method of claim 1 , wherein a first set of band widths associated with the current picture comprises the first band width for the first band and the second band width for the second band, and the method further comprises:

determining the first set of band widths associated with the current picture based on a second set of band widths associated with another frame.

12. An apparatus for video decoding, comprising processing circuitry configured to:

receive coded information from a coded video bitstream, the coded information being indicative of applying cross-component sample offset (CCSO) with adaptive bands;

determine at least a first band width for a first band and a second band width for a second band, the first band width being different from the second band width;

determine, for a current block in a current picture, at least a first offset associated with the first band and a second offset associated with the second band;

categorize reconstructed samples of a first color component in the current block into at least the first band and the second band based on the first band width of the first band and the second band width of the second band, the first band comprising first reconstructed samples of the first color component and the second band comprising second reconstructed samples of the first color component, the first reconstructed samples of the first color component collocating with first reconstructed samples of a second color component in the current block, the second reconstructed samples of the first color component collocating with second reconstructed samples of the second color component in the current block; and

apply at least the first offset to the first reconstructed samples of the second color component and the second offset to the second reconstructed samples of the second color component to generate CCSO compensated samples of the second color component.

13. The apparatus of claim 12 , wherein the processing circuitry is configured to:

decode at least the first band width from the coded information.

14. The apparatus of claim 13 , wherein the coded information comprises each of at least the first band width and the second band width that are coded by a fixed length code word.

15. The apparatus of claim 13 , wherein the processing circuitry is configured to:

decode at least a first difference value and a second difference value from the coded information;

determine the second band width by combining the first band width and the first difference value; and

determine a third band width for a third band by combining the first band width and the second difference value.

16. The apparatus of claim 13 , wherein the processing circuitry is configured to:

decode at least a first difference value and a second difference value from the coded information;

determine the second band width by combining the first band width and the first difference value; and

determine a third band width for a third band by combining the second band width and the second difference value.

17. The apparatus of claim 13 , wherein the processing circuitry is configured to:

decode, from at least one of a sequence parameter set, a picture header, and a slice header, a syntax element with a value that indicates a number of bits for coding at least the first band width.

18. The apparatus of claim 12 , wherein the processing circuitry is configured to:

decode difference values respectively associated with at least the first band and the second band from the coded video bitstream; and

combine the difference values with corresponding band widths of a previous picture to determine at least the first band width for the first band and the second band width for the second band.

19. The apparatus of claim 12 , wherein the current picture is at least one of:

a first frame in a video sequence that is coded in the coded video bitstream;

a key frame in the video sequence; and

a frame with a temporary layer satisfying a requirement.

20. The apparatus of claim 12 , wherein the processing circuitry is configured to:

decode, from at least one of a sequence parameter set, a picture header, and a slice header, a syntax element with a value that indicates whether the adaptive bands being applied with the CCSO.

Assignments (1)

Continuity (2)

References Cited (48)