Video encoding/decoding method and device using bdpcm, and method for transmitting bitstream

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

• determining whether block difference pulse code modulation (BDPCM) applies to a chroma block;
• when BDPCM applies to the chroma block, determining a prediction direction of BDPCM for the chroma block;
• determining an intra prediction mode of the chroma block based on the prediction direction of BDPCM for the chroma block;
• generating a residual block of the chroma block based on the prediction direction of BDPCM for the chroma block;
• generating a prediction block of the chroma block, by performing intra prediction based on the intra prediction mode of the chroma block;
• and
• encoding the residual block of the chroma block based on the prediction direction of BDPCM for the chroma block.

An image decoding apparatus, comprising:

• at least one processor;
• a memory storing machine-executable commands, which when executed by the at least one processor, causes the image decoding apparatus to:
• determine whether block difference pulse code modulation (BDPCM) applies to a chroma block;
• when BDPCM applies to the chroma block, determine a prediction direction of BDPCM for the chroma block;
• determine an intra prediction mode of the chroma block based on the prediction direction of BDPCM for the chroma block;
• generate a residual block of the chroma block based on the prediction direction of BDPCM for the chroma block;
• generate a prediction block of the chroma block, by performing intra prediction based on the intra prediction mode of the chroma block;
• and
• reconstruct the chroma block based on the residual block and the prediction block.