Video colour component prediction method and apparatus, and computer storage medium

A decoding apparatus, comprising:

• a processor;
• and
• a memory storing an instruction executable by the processor, wherein when the instruction is executed, the processor is configured to:
• acquire a first colour component neighboring reference value, a second colour component neighboring reference value and a first colour component reconstructed value corresponding to a current block, wherein the first colour component neighboring reference value is indicative of a first colour component parameter corresponding to a neighboring reference sample of the current block, the second colour component neighboring reference value is indicative of a second colour component parameter corresponding to the neighboring reference sample of the current block, and the first colour component reconstructed value is indicative of one or more reconstructed parameters of a first colour component corresponding to the current block;
• generate a second colour component predicted value corresponding to the current block at least based on a linear model corresponding to factors, wherein the factors are determined by at least one of a weight coefficient, the first colour component neighboring reference value, or the second colour component neighboring reference value;
• and
• decode the current block based on the second colour component predicted value.

A method for encoding a video, comprising:

• determining a first colour component neighboring reference value, a second colour component neighboring reference value and a first colour component reconstructed value corresponding to a current block, wherein the first colour component neighboring reference value is indicative of a first colour component parameter corresponding to a neighboring reference sample of the current block, the second colour component neighboring reference value is indicative of a second colour component parameter corresponding to the neighboring reference sample of the current block, and the first colour component reconstructed value is indicative of one or more reconstructed parameters of a first colour component corresponding to the current block;
• determining a second colour component predicted value corresponding to the current block at least based on a linear model corresponding to factors, wherein the factors are determined by at least one of a weight coefficient, the first colour component neighboring reference value, or the second colour component neighboring reference value;
• and
• encoding the video based on the second colour component predicted value.