Granted Patent B2

US 12,244,838 · App. 18/074,855 · Granted Mar 4, 2025

Inventor: Liqiang Wang (Shenzhen, CN)

Assignee: TENCENT TECHNOLOGY (SHENZHEN) COMPANY LIMITED

H04N19/44H04N19/119H04N19/176

Abstract

Claims (43)

1. A video decoding method, comprising:

acquiring a coding block of a video image frame;

determining a partitioning mode available to the coding block according to a size of the coding block and an allowable maximum sub-block size ratio when determining that sub-block transform (SBT) is to be performed on the coding block;

determining, based on the partitioning mode available to the coding block, a target partitioning mode used during the SBT performed on the coding block; and

partitioning the coding block based on the target partitioning mode, and decoding a plurality of sub-blocks obtained through the partitioning,

wherein determining a partitioning mode available to the coding block comprises at least one of:

allowing a vertical half partitioning mode for the coding block when determining that a width of the coding block is greater than or equal to 8 and twice a height of the coding block is less than or equal to a product of the width and the maximum sub-block size ratio, or otherwise prohibiting the vertical half partitioning mode for the coding block;

allowing a vertical quad partitioning mode for the coding block when determining that a width of the coding block is greater than or equal to 16 and 4 times a height of the coding block is less than or equal to a product of the width and the maximum sub-block size ratio, or otherwise prohibiting the vertical quad partitioning mode for the coding block;

allowing a horizontal half partitioning mode for the coding block when determining that a height of the coding block is greater than or equal to 8 and twice a width of the coding block is less than or equal to a product of the height and the maximum sub-block size ratio, or otherwise prohibiting the horizontal half partitioning mode for the coding block; or

allowing a horizontal quad partitioning mode for the coding block when determining that a height of the coding block is greater than or equal to 16 and 4 times a width of the coding block is less than or equal to a product of the height and the maximum sub-block size ratio, or otherwise prohibiting the horizontal quad partitioning mode for the coding block.

2. The video decoding method according to claim 1 , wherein when the vertical half partitioning mode or the vertical quad partitioning mode is allowed, the maximum sub-block size ratio is a maximum sub-block height-width ratio.

3. The video decoding method according to claim 1 , wherein when the horizontal half partitioning mode or the horizontal quad partitioning mode is allowed, the maximum sub-block size ratio is a maximum sub-block width-height ratio.

4. The video decoding method according to claim 1 , wherein the maximum sub-block size ratio includes a maximum width-height ratio and a maximum height-width ratio, a value of the maximum width-height ratio being equal to a value of the maximum height-width ratio, and the method further comprises:

decoding a value of the maximum sub-block size ratio from a sequence header of the video image frame.

5. The video decoding method according to claim 1 , wherein the maximum sub-block size ratio includes a maximum width-height ratio and a maximum height-width ratio, a value of the maximum width-height ratio being not equal to a value of the maximum height-width ratio, and the method further comprises:

decoding the value of the maximum width-height ratio and the value of the maximum height-width ratio from a sequence header of the video image frame.

6. The video decoding method according to claim 1 , wherein a value of the maximum sub-block size ratio is the same as a value of an allowable maximum coding block size ratio.

7. The video decoding method according to claim 1 , further comprising:

performing a transform skip operation or an inverse transform operation.

8. A video decoding apparatus, comprising: a memory storing computer program instructions; and a processor coupled to the memory and configured to execute the computer program instructions and perform:

acquiring a coding block of a video image frame;

determining a partitioning mode available to the coding block according to a size of the coding block and an allowable maximum sub-block size ratio when determining that sub-block transform (SBT) is to be performed on the coding block;

determining, based on the partitioning mode available to the coding block, a target partitioning mode used during the SBT performed on the coding block; and

partitioning the coding block based on the target partitioning mode, and decoding a plurality of sub-blocks obtained through the partitioning

wherein determining a partitioning mode available to the coding block comprises at least one of:

allowing a vertical half partitioning mode for the coding block when determining that a width of the coding block is greater than or equal to 8 and twice a height of the coding block is less than or equal to a product of the width and the maximum sub-block size ratio, or otherwise prohibiting the vertical half partitioning mode for the coding block;

allowing a vertical quad partitioning mode for the coding block when determining that a width of the coding block is greater than or equal to 16 and 4 times a height of the coding block is less than or equal to a product of the width and the maximum sub-block size ratio, or otherwise prohibiting the vertical quad partitioning mode for the coding block;

allowing a horizontal half partitioning mode for the coding block when determining that a height of the coding block is greater than or equal to 8 and twice a width of the coding block is less than or equal to a product of the height and the maximum sub-block size ratio, or otherwise prohibiting the horizontal half partitioning mode for the coding block; or

allowing a horizontal quad partitioning mode for the coding block when determining that a height of the coding block is greater than or equal to 16 and 4 times a width of the coding block is less than or equal to a product of the height and the maximum sub-block size ratio, or otherwise prohibiting the horizontal quad partitioning mode for the coding block.

9. The video decoding apparatus according to claim 8 , wherein when the vertical half partitioning mode or the vertical quad partitioning mode is allowed, the maximum sub-block size ratio is a maximum sub-block height-width ratio.

10. The video decoding apparatus according to claim 8 , wherein when the horizontal half partitioning mode or the horizontal quad partitioning mode is allowed, the maximum sub-block size ratio is a maximum sub-block width-height ratio.

11. The video decoding apparatus according to claim 8 , wherein the maximum sub-block size ratio includes a maximum width-height ratio and a maximum height-width ratio, a value of the maximum width-height ratio being equal to a value of the maximum height-width ratio, and the processor is further configured to execute the computer program instructions and perform:

decoding a value of the maximum sub-block size ratio from a sequence header of the video image frame.

12. A non-transitory computer-readable storage medium storing computer program instructions executable by at least one processor to perform:

acquiring a coding block of a video image frame;

determining a partitioning mode available to the coding block according to a size of the coding block and an allowable maximum sub-block size ratio when determining that sub-block transform (SBT) is to be performed on the coding block;

determining, based on the partitioning mode available to the coding block, a target partitioning mode used during the SBT performed on the coding block; and

partitioning the coding block based on the target partitioning mode, and decoding a plurality of sub-blocks obtained through the partitioning

wherein determining a partitioning mode available to the coding block comprises at least one of:

allowing a vertical half partitioning mode for the coding block when determining that a width of the coding block is greater than or equal to 8 and twice a height of the coding block is less than or equal to a product of the width and the maximum sub-block size ratio, or otherwise prohibiting the vertical half partitioning mode for the coding block;

allowing a vertical quad partitioning mode for the coding block when determining that a width of the coding block is greater than or equal to 16 and 4 times a height of the coding block is less than or equal to a product of the width and the maximum sub-block size ratio, or otherwise prohibiting the vertical quad partitioning mode for the coding block;

allowing a horizontal half partitioning mode for the coding block when determining that a height of the coding block is greater than or equal to 8 and twice a width of the coding block is less than or equal to a product of the height and the maximum sub-block size ratio, or otherwise prohibiting the horizontal half partitioning mode for the coding block; or

allowing a horizontal quad partitioning mode for the coding block when determining that a height of the coding block is greater than or equal to 16 and 4 times a width of the coding block is less than or equal to a product of the height and the maximum sub-block size ratio, or otherwise prohibiting the horizontal quad partitioning mode for the coding block.

Assignments (1)

Priority Claims (1)

Continuity (2)

References Cited (34)