Methods and apparatus of video coding using improved matrix-based intra prediction coding mode

Abstract

An electronic apparatus performs a method of updating a most probable modes candidate list for a current block of video data. The electronic apparatus first identifies a neighboring block located at a predefined location relative to the current block and its associated matrix-based intra prediction mode. Next, the electronic apparatus determines a regular intra prediction mode corresponding to the matrix-based intra prediction mode for the neighboring block according to a predefined mathematical relationship between regular intra prediction modes and matrix-based intra prediction modes. Finally, the electronic apparatus inserts the regular intra prediction mode associated with the neighboring block into the most probable modes candidate list according to a predefined order. If the regular intra prediction mode is signaled in the syntax of a video bitstream including the current block, a video decoder will predict the current block from the reconstructed neighboring block according to the regular intra prediction mode.