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

An electronic apparatus comprising:

• one or more processing units;
• a memory coupled to the one or more processing units;
• and
• a plurality of programs stored in the memory that, when executed by the one or more processing units, cause the electronic apparatus to perform acts comprising:
• identifying a neighboring block located at a predefined location relative to a current block and its associated matrix-based intra prediction mode;
• determining a regular intra prediction mode corresponding to the matrix-based intra prediction mode for the neighboring block according to a predefined mathematical relationship between multiple regular intra prediction modes and respective matrix-based intra prediction modes;
• and
• inserting the regular intra prediction mode associated with the neighboring block into a mode candidate list according to a predefined order.

A non-transitory computer readable storage medium storing a plurality of programs for execution by an electronic apparatus having one or more processing units, wherein the plurality of programs, when executed by the one or more processing units, cause the electronic apparatus to perform acts comprising:

• identifying a neighboring block located at a predefined location relative to a current block and its associated matrix-based intra prediction mode;
• determining a regular intra prediction mode corresponding to the matrix-based intra prediction mode for the neighboring block according to a predefined mathematical relationship between multiple regular intra prediction modes and respective matrix-based intra prediction modes;
• and
• inserting the regular intra prediction mode associated with the neighboring block into a mode candidate list according to a predefined order.