Granted Patent B2

US 12,278,993 · App. 18/599,544 · Granted Apr 15, 2025

Inventors: Zhi Zhang (Solna, SE); Kenneth Andersson (Gävle, SE); Davood Saffar (Solna, SE); Rickard Sjöberg (Stockholm, SE); Jacob Ström (Stockholm, SE); Ruoyang Yu (Täby, SE)

Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

H04N19/61H04N19/105H04N19/11H04N19/122H04N19/132H04N19/159H04N19/167H04N19/176H04N19/70

Abstract

Claims (53)

1. A method performed by a video decoder, the method comprising:

determining a width and a height of a current block of a bitstream based on syntax elements in the bitstream;

determining whether the current block is an intra predicted block;

responsive to the current block being an intra predicted block, determining whether the intra predicted block is a matrix based intra prediction, MIP, predicted block;

determining whether the MIP predicted block has one transform block or multiple transform blocks;

determining a MIP weight matrix to be used to decode the current block based on a MIP prediction mode of the current block;

responsive to determining that the MIP predicted block has one transform block:

deriving the MIP predicted block based on the MIP weight matrix; and

responsive to determining that the MIP predicted block has multiple transform blocks:

deriving a first MIP predicted block based on the MIP weight matrix; and

deriving remaining MIP predicted blocks based on the MIP weight matrix and at least one decoded transform block of the current block; and

outputting the MIP predicted block or the first MIP predicted block and remaining predicted blocks for subsequent processing by the video decoder.

2. The method of claim 1 , wherein determining whether the intra predicted block is a MIP predicted block comprises determining whether a syntax element in the bitstream indicates that the intra predicted block is a MIP predicted block.

3. The method of claim 1 , wherein determining whether the MIP predicted block has one transform block or multiple transform blocks comprises:

deriving a maximum transform size based on syntax elements in the bitstream;

responsive to the width of the current block being less than or equal to the maximum transform size and the height of the current block being less than or equal to the maximum transform size, determining that the MIP predicted block has one transform block; and

responsive to the width of the current block being greater than the maximum transform size or the height of the current block being greater than the maximum transform size, determining that the MIP predicted block has multiple transform blocks.

4. A video decoder comprising:

a processor; and

memory coupled with the processor, wherein the memory comprises instructions that, when executed by the processor, cause the processor to perform operations comprising:

determining a width and a height of a current block of a bitstream based on syntax elements in the bitstream;

determining whether the current block is an intra predicted block;

determining whether the intra predicted block is a matrix based intra prediction, MIP, predicted block;

determining whether the MIP predicted block has one transform block or multiple transform blocks;

determining a MIP weight matrix to be used to decode the current block based on a MIP prediction mode of the current block;

responsive to determining that the MIP predicted block has one transform block:

deriving the MIP predicted block based on the MIP weight matrix; and

responsive to determining that the MIP predicted block has multiple transform blocks:

deriving a first MIP predicted block based on the MIP weight matrix; and

deriving remaining MIP predicted blocks based on the MIP weight matrix and at least one decoded transform block of the current block; and

outputting the MIP predicted block or the first MIP predicted block and remaining predicted blocks for subsequent processing by the video decoder.

5. The video decoder of claim 4 , wherein in determining whether the intra predicted block is a MIP predicted block, the memory comprises instructions that, when executed by the processor, cause the processor to perform operations comprising determining whether a syntax element in the bitstream indicates that the intra predicted block is a MIP predicted block.

6. The video decoder of claim 4 , wherein in determining whether the MIP predicted block has one transform block or multiple transform blocks, the memory comprises instructions that, when executed by the processor, cause the processor to perform operations comprising:

deriving a maximum transform size based on elements in the bitstream;

responsive to the width of the current block being less than or equal to the maximum transform size and the height of the current block being less than or equal to the maximum transform size, determining that the MIP predicted block has one transform block; and

responsive to the width of the current block being greater than the maximum transform size and the height of the current block being greater than the maximum transform size, determining that the MIP predicted block has multiple transform blocks.

7. A non-transitory computer readable medium including program code to be executed by processing circuitry of a computing device, whereby execution of the program code causes the program code to perform operations comprising:

determining a width and a height of a current block of a bitstream based on syntax elements in the bitstream;

determining whether the current block is an intra predicted block;

determining whether the intra predicted block is a matrix based intra prediction, MIP, predicted block;

responsive to the current block being a MIP predicted block, determining whether the MIP predicted block has one transform block or multiple transform blocks;

determining a MIP weight matrix to be used to decode the current block based on a MIP prediction mode of the current block;

responsive to determining that the MIP predicted block has one transform block:

deriving the MIP predicted block based on the MIP weight matrix; and

responsive to determining that the MIP predicted block has multiple transform blocks:

deriving a first MIP predicted block based on the MIP weight matrix; and

deriving remaining MIP predicted blocks based on the MIP weight matrix and at least one decoded transform block of the current block; and

outputting the MIP predicted block or the first MIP predicted block and remaining predicted blocks for subsequent processing by a video decoder.

8. The non-transitory computer readable medium of claim 7 , wherein determining whether the intra predicted block is a MIP predicted block comprises determining whether a syntax element in the bitstream indicates that the intra predicted block is a MIP predicted block.

9. The non-transitory computer readable medium of claim 7 , wherein determining whether the MIP predicted block has one transform block or multiple transform blocks comprises:

deriving a maximum transform size based on syntax elements in the bitstream;

responsive to the width of the current block being less than or equal to the maximum transform size and the height of the current block being less than or equal to the maximum transform size, determining that the MIP predicted block has one transform block; and

responsive to the width of the current block being greater than the maximum transform size or the height of the current block being greater than the maximum transform size, determining that the MIP predicted block has multiple transform blocks.

Assignments (1)

Continuity (3)

References Cited (22)