Cross-component linear model (cclm) intra prediction-based video encoding/decoding method, apparatus, and recording medium for storing bitstream

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

• deriving chroma reference samples located around a chroma block and luma reference samples corresponding to the chroma reference samples based on an intra prediction mode of the chroma block being a cross-component linear model (CCLM) mode;
• deriving CCLM parameters based on the chroma reference samples and the luma reference samples;
• and
• generating a prediction sample of the chroma block based on the CCLM parameters,
• wherein the chroma reference samples are obtained from two or more chroma reference lines adjacent to the chroma block.

A computer-readable recording medium storing a bitstream generated by an image encoding method, the image encoding method comprising:

• deriving chroma reference samples located around a chroma block and luma reference samples corresponding to the chroma reference samples based on an intra prediction mode of the chroma block being a cross-component linear model (CCLM) mode;
• deriving CCLM parameters based on the chroma reference samples and the luma reference samples;
• and
• generating a prediction sample of the chroma block based on the CCLM parameters,
• wherein the chroma reference samples are obtained from two or more chroma reference lines adjacent to the chroma block.

A method of transmitting a bitstream generated by an image encoding method, the image encoding method comprising:

• deriving chroma reference samples located around a chroma block and luma reference samples corresponding to the chroma reference samples based on an intra prediction mode of the chroma block being a cross-component linear model (CCLM) mode;
• deriving CCLM parameters based on the chroma reference samples and the luma reference samples;
• and
• generating a prediction sample of the chroma block based on the CCLM parameters,
• wherein the chroma reference samples are obtained from two or more chroma reference lines adjacent to the chroma block.