Image coding/decoding method, coder, decoder, and storage medium
Provided are a picture encoding and decoding method, an encoder, a decoder and a storage medium. The decoder decodes a bitstream to obtain a size, a coding mode, and residuals of a current block; when the coding mode of the current block is an MIP mode, calculates a second offset based on the size of the current block, a first offset and reconstructed values of adjacent pixels corresponding to the current block; calculates a second prediction value of a pixel at a preset position in the current block by using the second offset, the preset position being a particular position in the current block; performs filtering on the second prediction value to obtain first prediction values of all pixels in the current block; and calculates sum values of the first prediction values and the residuals, and sets the sum values as reconstructed values of the current block.
1. 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, calculating a second offset based on the size of the current block, a first offset, and reconstructed values of adjacent pixels corresponding to the current block, wherein the second offset is a value used to perform prediction through the MIP mode and the first offset is a constant;
calculating a second prediction value of a pixel at a preset position in the current block by using the second offset, wherein the preset position is a particular position in the current block;
performing filtering on the second prediction value to obtain first prediction values of all pixels in the current block;
calculating residuals between original values and the first prediction values of the current block; and
encoding the residuals.
2. The method of claim 1 , wherein the second offset is used for controlling an offset of a result of bit-shift operation in a process of calculating the second prediction value.
3. 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, calculating a second offset based on the size of the current block, a first offset, and reconstructed values of adjacent pixels corresponding to the current block, wherein the second offset is a value used to perform prediction through the MIP mode and the first offset is a constant;
calculating a second prediction value of a pixel at a preset position in the current block by using the second offset, wherein the preset position is a particular position in the current block;
performing filtering on the second prediction value to obtain first prediction values of all pixels in the current block; and
calculating sum values of the first prediction values and the residuals, and setting the sum values as reconstructed values of the current block.
4. The method of claim 3 , wherein
the second offset is used for controlling an offset of a result of bit-shift operation in a process of calculating the second prediction value.
5. 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, calculating a second offset based on the size of the current block, a first offset, and reconstructed values of adjacent pixels corresponding to the current block, wherein the second offset is a value used to perform prediction through the MIP mode and the first offset is a constant;
calculating a second prediction value of a pixel at a preset position in the current block by using the second offset, wherein the preset position is a particular position in the current block;
performing filtering on the second prediction value to obtain first prediction values of all pixels in the current block;
calculating residuals between original values and the first prediction values of the current block; and
encoding the residuals.
6. The encoder of claim 5 , wherein the second offset is used for controlling an offset of a result of bit-shift operation in a process of calculating the second prediction value.
7. 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, calculating a second offset based on the size of the current block, a first offset, and reconstructed values of adjacent pixels corresponding to the current block, wherein the second offset is a value used to perform prediction through the MIP mode and the first offset is a constant;
calculating a second prediction value of a pixel at a preset position in the current block by using the second offset, wherein the preset position is a particular position in the current block;
performing filtering on the second prediction value to obtain first prediction values of all pixels in the current block; and
calculating sum values of the first prediction values and the residuals, and setting the sum values as reconstructed values of the current block.
8. The decoder of claim 7 , wherein the second offset is used for controlling an offset of a result of bit-shift operation in a process of calculating the second prediction value.