Colour component prediction method, encoder, and decoder

A method for colour component prediction, applied to a decoder and comprising:

• determining a neighbouring reference sample set of a current block, wherein the neighbouring reference sample set comprises at least one reference sample;
• determining a preset parameter value corresponding to the current block, comprising:
• determining a bitdepth value corresponding to a to-be-predicted colour component of the current block;
• and performing a shift on 1 by the bitdepth value minus 1 to obtain the preset parameter value;
• determining an input sample matrix by means of a first preset calculation model based on the neighbouring reference sample set and the preset parameter value;
• and
• performing colour component prediction on the current block according to the input sample matrix to obtain a prediction block of the current block.

An encoder, comprising a first memory and a first processor, wherein

• the first memory is configured to store a computer program capable of running in the first processor;
• and
• the first processor is configured to run the computer program to execute a method for colour component prediction, the method comprising:
• determining a neighbouring reference sample set of a current block, wherein the neighbouring reference sample set comprises at least one reference sample;
• determining a preset parameter value corresponding to the current block, comprising:
• determining a bitdepth value corresponding to a to-be-predicted colour component of the current block;
• and performing a shift on 1 by the bitdepth value minus 1 to obtain the preset parameter value;
• determining an input sample matrix by means of a first preset calculation model based on the neighbouring reference sample set and the preset parameter value;
• and
• performing colour component prediction on the current block according to the input sample matrix to obtain a prediction block of the current block.

A decoder, comprising a second memory and a second processor, wherein

• the second memory is configured to store a computer program capable of running in the second processor;
• and
• the second processor is configured to run the computer program to execute a method for colour component prediction, comprising:
• determining a neighbouring reference sample set of a current block, wherein the neighbouring reference sample set comprises at least one reference sample;
• determining a preset parameter value corresponding to the current block, comprising:
• determining a bitdepth value corresponding to a to-be-predicted colour component of the current block;
• and performing a shift on 1 by the bitdepth value minus 1 to obtain the preset parameter value;
• determining an input sample matrix by means of a first preset calculation model based on the neighbouring reference sample set and the preset parameter value;
• and
• performing colour component prediction on the current block according to the input sample matrix to obtain a prediction block of the current block.