Coding method and apparatus, decoding method and apparatus, and coding device, decoding device and storage medium

An encoding method, comprising:

• determining reference sample values of a first colour component of a current block;
• determining, according to the reference sample values of the first colour component of the current block, weighting coefficients through a neural network model, wherein an input of the neural network model comprises the reference sample values of the first colour component of the current block;
• determining a prediction block of a second colour component of the current block according to the weighting coefficients and reference sample values of the second colour component of the current block;
• and
• determining prediction difference values of second colour component samples of the current block according to the prediction block.

A decoding device, comprising a memory and a processor, wherein

• the memory is configured to store computer programs executable on the processor;
• and
• the processor is configured to perform operations of:
• determining reference sample values of a first colour component of a current block;
• determining, according to the reference sample values of the first colour component of the current block, weighting coefficients through a neural network model, wherein an input of the neural network model comprises the reference sample values of the first colour component of the current block;
• determining a prediction block of a second colour component of the current block according to the weighting coefficients and reference sample values of the second colour component of the current block;
• and
• determining reconstructed values of second colour component samples of the current block according to the prediction block.