IP Library › Granted Patent US 11,356,685

Granted Patent B2

US 11,356,685 · App. 17/027,262 · Granted Jun 7, 2022

Signaling number of sub-pictures in high-level syntax for video coding

Inventors: Yao-Jen Chang (San Diego, CA); Muhammed Zeyd Coban (Carlsbad, CA); Vadim Seregin (San Diego, CA); Marta Karczewicz (San Diego, CA)

Assignee: Qualcomm Incorproated

H04N19/44 H04N19/132 H04N19/176 H04N19/186 H04N19/423 H04N19/70

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Quick Facts

Patent No.: US 11,356,685
App. No.: 17/027,262
Granted: Jun 7, 2022
Kind: B2

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Abstract

A video decoder can be configured to decode a first syntax element indicating a size of a coding tree unit (CTU); after decoding the first syntax element indicating the size of the CTU, decode a second syntax element indicating a width of elements of a subpicture identifier grid; after decoding the first syntax element indicating the size of the CTU, decode a third syntax element indicating a height of the elements of the subpicture identifier grid; and determine a location of a subpicture within a picture based on the first syntax element, the second syntax element, and the third syntax element.

Claims (75)

1. A method of decoding video data, the method comprising:

decoding a first syntax element indicating a size of a coding tree unit (CTU);

after decoding the first syntax element indicating the size of the CTU, decoding a second syntax element indicating a width of elements of a subpicture identifier grid;

after decoding the first syntax element indicating the size of the CTU, decoding a third syntax element indicating a height of the elements of the subpicture identifier grid;

after decoding the first syntax element indicating the size of the CTU, decoding a fourth syntax element indicating a grid index for a subpicture;

determining a maximum value between the size of the CTU and a predetermined value;

in response to the predetermined value being the maximum value, determining a number of columns in the subpicture identifier grid based on the predetermined value;

in response to the predetermined value being the maximum value, determining a number of rows in the subpicture identifier grid based on the predetermined value;

determining a location of the subpicture within a picture based on the grid index, the determined number of columns, and the determined number of rows; and

decoding the subpicture based on the determined location.

2. The method of claim 1 , wherein determining the location of the subpicture within the picture based on the grid index, the determined number of columns, and the determined number of row further comprises:

identifying an element of the elements of the subpicture identifier grid based on a value of the fourth syntax element, the determined number of columns in the subpicture identifier grid, and the determined number of rows in the subpicture identifier grid; and

determining the location of the subpicture within the picture based on the identified element.

3. The method of claim 2 , wherein determining the location of the subpicture within the picture based on the identified element comprises determining a top-left luma sample of the subpicture based on the identified element.

4. The method of claim 1 , further comprising:

allocating an amount of memory to store the value of the fourth syntax element based on the size of the CTU.

5. The method of claim 1 , further comprising:

receiving the first syntax element, the second syntax element, and the third syntax element in a sequence parameter set of the video data.

6. The method of claim 4 , wherein the first syntax element is included in the sequence parameter set of the video data before the second syntax element and the third syntax element.

7. A device for decoding video data, the device comprising:

a memory; and

one or more processors implemented in circuitry, coupled to the memory, and configured to:

decode a first syntax element indicating a size of a coding tree unit (CTU);

after decoding the first syntax element indicating the size of the CTU, decode a second syntax element indicating a width of elements of a subpicture identifier grid;

after decoding the first syntax element indicating the size of the CTU, decode a third syntax element indicating a height of the elements of the subpicture identifier grid;

after decoding the first syntax element indicating the size of the CTU, decode a fourth syntax element indicating a grid index for a subpicture;

determine a maximum value between the size of the CTU and a predetermined value;

in response to the predetermined value being the maximum value, determine a number of columns in the subpicture identifier grid based on the predetermined value;

in response to the predetermined value being the maximum value, determine a number of rows in the subpicture identifier grid based on the predetermined value;

determine a location of the subpicture within a picture based on the grid index, the determined number of columns, and the determined number of rows; and

decode the subpicture based on the determined location.

8. The device of claim 7 , wherein to determine the location of the subpicture within the picture based on the grid index, the determined number of columns, and the determined number of row, the one or more processors are further configured to:

identify an element of the elements of the subpicture identifier grid based on a value of the fourth syntax element, the determined number of columns in the subpicture identifier grid, and the determined number of rows in the subpicture identifier grid; and

determine the location of the subpicture within the picture based on the identified element.

9. The device of claim 8 , wherein to determine the location of the subpicture within the picture based on the identified element, the one or more processors are further configured to determine a top-left luma sample of the subpicture based on the identified element.

10. The device of claim 7 , wherein the one or more processors are further configured to:

allocate an amount of memory to store the value of the fourth syntax element based on the size of the CTU.

11. The device of claim 7 , wherein the one or more processors are further configured to:

receive the first syntax element, the second syntax element, and the third syntax element in a sequence parameter set of the video data.

12. The device of claim 10 , wherein the first syntax element is included in the sequence parameter set of the video data before the second syntax element and the third syntax element.

13. The device of claim 10 , further comprising:

a display configured to display the decoded subpicture.

14. A non-transitory computer-readable storage medium having stored thereon instructions that, when executed, configure a processor to: