Granted Patent B2

US 12,323,614 · App. 18/527,169 · Granted Jun 3, 2025

Inventors: Junyan Huo (Guangdong, CN); Yanzhuo Ma (Guangdong, CN); Shuai Wan (Guangdong, CN); Wei Zhang (Guangdong, CN); Fuzheng Yang (Guangdong, CN); Haixin Wang (Guangdong, CN); Yu Sun (Guangdong, CN)

Assignee: GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD.

H04N19/50H04N19/176

Abstract

Claims (48)

1. A picture decoding method, applicable to a decoder, the method comprising:

decoding a bitstream to obtain a size, a coding mode, and residuals of a current block;

when the coding mode of the current block is a Matrix-based Intra Prediction (MIP) mode,

determining a value of a MIP block size index number corresponding to the current block according to the size of the current block;

determining a first offset for calculating a second offset;

calculating the second offset based on the MIP block size index number, the first offset and reconstructed values of adjacent pixels corresponding to the current block;

determining a first prediction value of the current block according to the second offset; and

determining a reconstructed value of the current block based on the first prediction value.

2. The method of claim 1 , further comprising:

calculating a second prediction value of a pixel at a preset position in the current block through the second offset, wherein the preset position is a particular position in the current block; and

performing linear interpolation on the second prediction value to obtain first prediction values in the current block.

3. The method of claim 1 , wherein the first offset is a constant.

4. A picture encoding method, applicable to an encoder, the method comprising:

determining a size of a current block;

when encoding the current block by using a Matrix-based Intra Prediction (MIP) mode,

determining a value of a MIP block size index number corresponding to the current block according to the size of the current block;

determining a first offset for calculating a second offset;

calculating the second offset based on the MIP block size index number, the first offset and reconstructed values of adjacent pixels corresponding to the current block;

determining a first prediction value of the current block according to the second offset; and

encoding the current block based on the first prediction value.

5. The method of claim 4 , further comprising:

calculating a second prediction value of a pixel at a preset position in the current block through the second offset, wherein the preset position is a particular position in the current block; and

performing linear interpolation on the second prediction value to obtain first prediction values in the current block.

6. The method of claim 4 , wherein the first offset is a constant.

7. An encoder, comprising: a first processor, a first memory configured to store instructions executable by the first processor, a first communication interface, and a first bus configured to connect the first processor, the first memory and the first communication interface, wherein the first processor is configured to, when executing the instructions, perform steps of:

determining a size of a current block;

when encoding the current block by using a Matrix-based Intra Prediction (MIP) mode,

determining a value of a MIP block size index number corresponding to the current block according to the size of the current block;

determining a first offset for calculating a second offset;

calculating the second offset based on the MIP block size index number, the first offset and reconstructed values of adjacent pixels corresponding to the current block;

determining a first prediction value of the current block according to the second offset; and

encoding the current block based on the first prediction value.

8. The encoder of claim 7 , wherein the first processor is configured to, when executing the instructions, further perform steps of:

calculating a second prediction value of a pixel at a preset position in the current block through the second offset, wherein the preset position is a particular position in the current block; and

performing linear interpolation on the second prediction value to obtain first prediction values in the current block.

9. The encoder of claim 7 , wherein the first offset is a constant.

10. A decoder, comprising: a second processor, a second memory configured to store instructions executable by the second processor, a second communication interface, and a second bus configured to connect the second processor, the second memory and the second communication interface, wherein the second processor is configured to, when executing the instructions, perform steps of:

decoding a bitstream to obtain a size, a coding mode, and residuals of a current block;

when the coding mode of the current block is a Matrix-based Intra Prediction (MIP) mode,

determining a value of a MIP block size index number corresponding to the current block according to the size of the current block;

determining a first offset for calculating a second offset;

calculating the second offset based on the MIP block size index number, the first offset and reconstructed values of adjacent pixels corresponding to the current block;

determining a first prediction value of the current block according to the second offset; and

determining a reconstructed value of the current block based on the first prediction value.

11. The decoder of claim 10 , wherein the second processor is configured to, when executing the instructions, further perform steps of:

calculating a second prediction value of a pixel at a preset position in the current block through the second offset, wherein the preset position is a particular position in the current block; and

performing linear interpolation on the second prediction value to obtain first prediction values in the current block.

12. The decoder of claim 10 , wherein the first offset is a constant.

Assignments (1)

Continuity (4)

References Cited (60)