Granted Patent B2

US 12,316,865 · App. 17/370,887 · Granted May 27, 2025

Inventors: Ye-Kui Wang (San Diego, CA); Fnu Hendry (San Diego, CA)

Assignee: Huawei Technologies Co., Ltd.

H04N19/436H04N19/119H04N19/132H04N19/137H04N19/174H04N19/184H04N19/188H04N19/1883H04N19/44H04N19/593H04N19/176H04N19/31H04N19/70

Abstract

Claims (42)

1. A method implemented in a decoder, the method comprising:

receiving a bitstream comprising a sequence parameter set (SPS), one or more sub-pictures partitioned from a picture, and one or more slice headers associated with one or more slices, wherein the SPS comprises a complete set of all sub-picture identifiers (IDs) for the one or more sub-pictures, wherein each sub-picture is a rectangular region capable of including more than one slice within the picture, and wherein the SPS further comprises one or more sub-picture sizes and one or more sub-picture positions for the one or more sub-pictures partitioned from the picture;

parsing the SPS to obtain sub-picture IDs for the one or more sub-pictures;

determining positions for the one or more sub-pictures based on the SPS;

parsing the slice headers to obtain a current sub-picture ID associated with a current sub-picture, the current sub-picture ID indicating the slices are included in the current sub-picture from the one or more sub-pictures;

obtaining a loop filter across sub-picture boundaries enabled flag (loop_filter_across_subpic_enabled_flag), wherein the loop_filter_across_subpic_enabled_flag specifies that in-loop filtering operations across sub-picture boundaries are enabled when equal to one, and wherein the loop_filter_across_subpic_enabled_flag specifies that in-loop filtering operations are not performed across sub-picture boundaries when equal to zero; and

decoding the current sub-picture based on the current sub-picture ID, the loop_filter_across_subpic_enabled_flag, and the positions for the one or more sub-pictures to create a video sequence.

2. The method of claim 1 , wherein decoding the current sub-picture includes:

matching the slices to the current sub-picture based on the current sub-picture ID; and

positioning the slices based on a sub-picture size and a position for the current sub-picture.

3. The method of claim 1 , wherein a sub-picture position includes an offset distance between a top-left sample of the current sub-picture and a top-left sample of the picture.

4. The method of claim 1 , wherein a sub-picture size includes a sub-picture height in luma samples and a sub-picture width in luma samples.

5. The method of claim 1 , wherein the SPS further comprises an indication that one or more of the sub-pictures are motion constrained sub-pictures.

6. The method of claim 1 , wherein the bitstream further comprises a supplemental enhancement information (SEI) message, and wherein the SEI message comprises information describing a bit rate of a set of sub-picture sequences.

7. A method implemented in a decoder, the method comprising:

receiving a bitstream comprising a sequence parameter set (SPS), a sub-picture partitioned from a picture, and a slice header associated with a slice, wherein the SPS comprises a complete set of all sub-picture identifiers (IDs) for one or more sub-pictures, wherein each sub-picture is a rectangular region capable of including more than one slice within the picture, and wherein the SPS further comprises one or more sub-picture sizes and one or more sub-picture positions for the one or more sub-pictures partitioned from the picture;

obtaining a sub-picture ID for the sub-picture from the slice header;

determining a position for the sub-picture based on the SPS;

determining that the sub-picture contains the slice based on the sub-picture ID;

obtaining a loop filter across sub-picture boundaries enabled flag (loop_filter_across_subpic_enabled_flag), wherein the loop_filter_across_subpic_enabled_flag specifies that in-loop filtering operations across sub-picture boundaries are enabled when equal to one, and wherein the loop_filter_across_subpic_enabled_flag specifies that in-loop filtering operations are not performed across sub-picture boundaries when equal to zero; and

decoding the picture based on the sub-picture ID, the loop_filter_across_subpic_enabled_flag, and the position for the sub-picture.

8. The method of claim 7 , wherein the SPS further comprises the sub-picture ID for the sub-picture.

9. The method of claim 7 , wherein decoding the picture includes:

matching the slice to the sub-picture based on the sub-picture ID; and

positioning the slice based on a sub-picture size and the position for the sub-picture.

10. The method of claim 7 , wherein the position for the sub-picture includes an offset distance between a top-left sample of the sub-picture and a top-left sample of the picture.

11. The method of claim 7 , wherein a sub-picture size includes a sub-picture height in luma samples and a sub-picture width in luma samples.

12. The method of claim 7 , wherein the bitstream further comprises a supplemental enhancement information (SEI) message, and wherein the SEI message comprises information describing a bit rate of a set of sub-picture sequences.

13. A decoder comprising:

a receiver configured to receive a bitstream comprising a sequence parameter set (SPS), a sub-picture partitioned from a picture, and a slice header associated with a slice, wherein the SPS comprises a complete set of all sub-picture identifiers (IDs) for the one or more sub-pictures, wherein each sub-picture is a rectangular region capable of including more than one slice within the picture, and wherein the SPS further comprises one or more sub-picture sizes and one or more sub-picture positions for the one or more sub-pictures partitioned from the picture; and

a processor coupled to the receiver and configured to:

obtain a sub-picture ID for the sub-picture from the slice header;

determine a position for the sub-picture based on the SPS;

determine the sub-picture contains the slice based on the sub-picture ID;

obtain a loop filter across sub-picture boundaries enabled flag (loop_filter_across_subpic_enabled_flag), wherein the loop_filter_across_subpic_enabled_flag specifies that in-loop filtering operations across sub-picture boundaries are enabled when equal to one, and wherein the loop_filter_across_subpic_enabled_flag specifies that in-loop filtering operations are not performed across sub-picture boundaries when equal to zero; and

decode the picture based on the sub-picture ID, the loop_filter_across_subpic_enabled_flag, and the position for the sub-picture.

14. The decoder of claim 13 , wherein the SPS further comprises the sub-picture ID for the sub-picture.

15. The decoder of claim 13 , wherein decoding the picture includes:

matching the slice to the sub-picture based on the sub-picture ID; and

positioning the slice based on a sub-picture size and the position for the sub-picture.

16. The decoder of claim 13 , wherein the position for the sub-picture includes an offset distance between a top-left sample of the sub-picture and a top-left sample of the picture.

17. The decoder of claim 13 , wherein the bitstream further comprises a supplemental enhancement information (SEI) message, and wherein the SEI message comprises information describing a bit rate of a set of sub-picture sequences.

Assignments (1)

Continuity (3)

References Cited (76)