Image encoding/decoding method and device based on intra prediction mode conversion, and method for transmitting bitstream

An image decoding apparatus comprising:

• a memory;
• and
• at least one processor,
• wherein the at least one processor is configured to:
• obtain partitioning information of an image from a bitstream;
• determine a current block by partitioning the image based on the partitioning information;
• identify a neighboring block located around the current block;
• identify whether a prediction mode of the neighboring block is an MIP (matrix based intra prediction) mode;
• generate a candidate mode list of the current block based on a predetermined candidate mode, based on the prediction mode of the neighboring block being an MIP mode;
• and
• determine a prediction mode of the current block based on the candidate mode list.

An image encoding method performed by an image encoding apparatus, the image encoding method comprising:

• determining a current block by partitioning an image;
• identifying a neighboring block located around the current block;
• identifying whether a prediction mode of the neighboring block is an MIP (matrix based intra prediction) mode;
• generating a candidate mode list of the current block based on a predetermined candidate mode, based on the prediction mode of the neighboring block being an MIP mode;
• and
• encoding a prediction mode of the current block based on the candidate mode list.