Encoding and decoding method and apparatus, and device therefor

A decoding device, comprising:

• a processor, and
• a machine-readable storage medium,
• wherein the machine-readable storage medium stores machine executable instructions executable by the processor, the processor is configured to execute the machine executable instructions, and the processor is configured to:
• obtain, when determining to enable a weighted prediction for a current block, a weighted prediction angle of the current block and weight configuration parameters of the current block, wherein the weight configuration parameters comprise a weight transform rate and a weight transform start position;
• configure one or more reference weight values for surrounding positions outside the current block based on the weight configuration parameters;
• for each pixel position of the current block, determine, based on the weighted prediction angle and from the surrounding positions outside the current block, a surrounding matching position to which the pixel position points;
• determine a target weight value of the pixel position based on a reference weight value associated with the surrounding matching position;
• determine an association weight value of the pixel position based on the target weight value of the pixel position;
• determine a first prediction value of the pixel position based on a first prediction mode of the current block;
• determine a second prediction value of the pixel position based on a second prediction mode of the current block;
• determine, 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 determine weighted prediction values of the current block based on the weighted prediction values of all pixel positions in the current block;
• wherein in response to determining that the current block supports a weight transform rate switching mode, the processor obtains the weight transform rate of the current block as follows:
• obtaining weight transform rate indication information on the current block;
• and
• determining the weight transform rate based on the weight transform rate indication information, wherein in response to determining that the weight transform rate indication information is first indication information, the weight transform rate is a first weight transform rate, and in response to determining that the weight transform rate indication information is second indication information, the weight transform rate is a second weight transform rate.