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

An encoder for picture component prediction, comprising:

• a memory for storing executable video component prediction instructions;
• and a processor configured to perform the executable video component prediction instructions stored in the memory to perform following operations:
• determining a first picture component reference sample set of a current block;
• determining multiple first picture component reference samples from the first picture component reference sample set according to four preset sample positions;
• performing first filtering processing on the multiple first picture component reference samples, to obtain multiple filtered first picture reference samples;
• determining to-be-predicted picture component reference samples corresponding to the multiple filtered first picture reference samples, a to-be-predicted picture component being a picture component different from a first picture component;
• determining a parameter of a component model according to the multiple filtered first picture reference samples and the to-be-predicted picture component reference samples, the component model characterizing a mapping relationship for mapping a sample of the first picture component to a sample of the to-be-predicted picture component;
• performing mapping processing on a reconstructed sample of the first picture component of the current block according to the component model to determine a mapped sample;
• and
• determining a predicted sample of the to-be-predicted picture component of the current block according to the mapped sample.

A non-transitory computer-readable storage medium, having a computer program and a bitstream stored thereon, wherein the computer program, when executed by a processor, enables the processor to perform an encoding method to generate the bitstream, and the encoding method comprises:

• determining a first picture component reference sample set of a current block;
• determining multiple first picture component reference samples from the first picture component reference sample set according to four preset sample positions;
• performing first filtering processing on the multiple first picture component reference samples, to obtain multiple filtered first picture reference samples;
• determining to-be-predicted picture component reference samples corresponding to the multiple filtered first picture reference samples, a to-be-predicted picture component being a picture component different from a first picture component;
• determining a parameter of a component model according to the multiple filtered first picture reference samples and the to-be-predicted picture component reference samples, the component model characterizing a mapping relationship for mapping a sample of the first picture component to a sample of the to-be-predicted picture component;
• performing mapping processing on a reconstructed sample of the first picture component of the current block according to the component model to determine a mapped sample;
• and
• determining a predicted sample of the to-be-predicted picture component of the current block according to the mapped sample.