Decoding method, encoding method, and storage medium

Abstract

A decoding method, an encoding method, and a medium are provided. The decoding method includes the following. A bitstream is parsed to obtain a residual block of a current block. An optimal matrix based intra prediction (MIP) mode for predicting the current block is determined based on distortion costs corresponding to multiple MIP modes, where the distortion costs corresponding to the multiple MIP modes include distortion costs obtained by predicting samples in a template region adjacent to the current block in the multiple MIP modes. An intra prediction mode of the current block is determined based on the optimal MIP mode. The current block is predicted in the intra prediction mode of the current block, to obtain a prediction block of the current block. A reconstructed block of the current block is obtained based on the residual block of the current block and the prediction block of the current block.