Method, apparatus and device for coding and decoding

A decoder-side device, comprising:

• a processor, and
• a machine readable storage medium,
• wherein the machine readable storage medium stores machine executable instructions executable by the processor, and the processor is configured to execute the machine executable instructions to perform:
• when determining to enable a weighted prediction for a current block, for the current block, obtaining a weighted prediction angle of the current block;
• for each pixel position of the current block,
• determining a surrounding matching position pointed by the pixel position from surrounding positions outside the current block based on the weighted prediction angle of the current block;
• determining a target weight value of the pixel position based on a reference weight value associated with the surrounding matching position;
• determining an association weight value of the pixel position based on the target weight value of the pixel position;
• determining a first prediction value of the pixel position based on a first prediction mode of the current block;
• determining a second prediction value of the pixel position based on a second prediction mode of the current block;
• and
• determining, based on the first prediction value, the target weight value, the second prediction value and the association weight value, a weighted prediction value of the pixel position;
• and
• determining weighted prediction values of the current block based on the weighted prediction values of all pixel positions of the current block;
• wherein before determining the target weight value of the pixel position based on the reference weight value associated with the surrounding matching position, further comprising:
• configuring reference weight values for the surrounding positions outside the current block,
• wherein the reference weight values of the surrounding positions outside the current block are pre-configured or configured based on weight configuration parameters, and the weight configuration parameters comprise a weight transform rate and a weight transform start position.

A coder-side device, comprising:

• a processor, and
• a machine readable storage medium,
• wherein the machine readable storage medium stores machine executable instructions executable by the processor and the processor is configured to execute the machine executable instructions to perform:
• when determining to enable a weighted prediction for a current block, for the current block, obtaining a weighted prediction angle of the current block;
• for each pixel position of the current block,
• determining a surrounding matching position pointed by the pixel position from surrounding positions outside the current block based on the weighted prediction angle of the current block;
• determining a target weight value of the pixel position based on a reference weight value associated with the surrounding matching position;
• determining an association weight value of the pixel position based on the target weight value of the pixel position;
• determining a first prediction value of the pixel position based on a first prediction mode of the current block;
• determining a second prediction value of the pixel position based on a second prediction mode of the current block;
• and
• determining, based on the first prediction value, the target weight value, the second prediction value and the association weight value, a weighted prediction value of the pixel position;
• and
• determining weighted prediction values of the current block based on the weighted prediction values of all pixel positions of the current block;
• wherein before determining the target weight value of the pixel position based on the reference weight value associated with the surrounding matching position, further comprising:
• configuring reference weight values for the surrounding positions outside the current block,
• wherein the reference weight values of the surrounding positions outside the current block are pre-configured or configured based on weight configuration parameters, and the weight configuration parameters comprise a weight transform rate and a weight transform start position.