Prediction method for decoding and apparatus, and computer storage medium

A prediction device for encoding, comprising a memory and a processor, wherein

• the memory is configured to store a computer program capable of running in the processor;
• and
• the processor is configured to run the computer program to execute a prediction method for encoding, comprising:
• acquiring reference samples adjacent to at least one side of a coding block;
• determining a reference point from the at least one side and determining reference sample positions corresponding to the at least one side according to a preset number of samples;
• deriving reference samples corresponding to the reference sample positions from the reference samples;
• and
• performing prediction on the coding block based on the derived reference samples, wherein the performing prediction comprises:
• determining model parameters of a prediction model based on the derived reference samples, wherein the prediction model is configured to represent a prediction relationship between a first colour component and a second colour component corresponding to a sample in the coding block;
• and
• performing prediction on the coding block based on the prediction model;
• wherein the processor is further configured to:
• calculate a first sampling interval based on the preset number of samples and a length of the at least one side;
• and
• determine the reference point from the at least one side, and determining the reference sample positions corresponding to the at least one side according to the first sampling interval.

A non-transitory computer storage medium, storing a prediction program for encoding, wherein the prediction program for encoding is executed by at least one processor to implement a prediction method for encoding, comprising:

• acquiring reference samples adjacent to at least one side of a coding block;
• determining a reference point from the at least one side and determining reference sample positions corresponding to the at least one side according to a preset number of samples;
• deriving reference samples corresponding to the reference sample positions from the reference samples;
• and
• performing prediction on the coding block based on the derived reference samples, wherein the performing prediction comprises:
• determining model parameters of a prediction model based on the derived reference samples, wherein the prediction model is configured to represent a prediction relationship between a first colour component and a second colour component corresponding to a sample in the coding block;
• and
• performing prediction on the coding block based on the prediction model;
• wherein determining the reference point from the at least one side and determining the reference sample positions corresponding to the at least one side according to the preset number of samples comprises:
• calculating a first sampling interval based on the preset number of samples and a length of the at least one side;
• and
• determining the reference point from the at least one side, and determining the reference sample positions corresponding to the at least one side according to the first sampling interval.