Decoding method, encoding method, and storage medium

An encoding method, applicable to an encoder and comprising:

• determining, based on distortion costs corresponding to a plurality of matrix based intra prediction (MIP) modes, an optimal MIP mode for predicting a current block, wherein the distortion costs corresponding to the plurality of MIP modes comprise distortion costs obtained by predicting samples in a template region adjacent to the current block in the plurality of MIP modes;
• determining the optimal MIP mode as an intra prediction mode of the current block;
• predicting the current block in the intra prediction mode of the current block, to obtain a prediction block of the current block;
• obtaining a residual block of the current block based on the prediction block of the current block and an original block of the current block;
• and
• encoding the residual block of the current block to obtain a bitstream.

A non-transitory computer-readable storage medium storing a computer program and a bitstream, wherein when executed by a processor, the computer program causes the processor to implement an encoding method to generate the bitstream, the encoding method comprising:

• determining, based on distortion costs corresponding to a plurality of matrix based intra prediction (MIP) modes, an optimal MIP mode for predicting a current block, wherein the distortion costs corresponding to the plurality of MIP modes comprise distortion costs obtained by predicting samples in a template region adjacent to the current block in the plurality of MIP modes;
• determining the optimal MIP mode as an intra prediction mode of the current block;
• predicting the current block in the intra prediction mode of the current block, to obtain a prediction block of the current block;
• obtaining a residual block of the current block based on the prediction block of the current block and an original block of the current block;
• and
• encoding the residual block of the current block to obtain the bitstream.