Decoding method and apparatus, coding method and apparatus, and devices

An encoding method, comprising:

• encoding a coefficient hyperparameter feature corresponding to a current picture block to obtain a first bitstream corresponding to the current picture block;
• determining a probability distribution parameter based on the coefficient hyperparameter feature;
• encoding an initial picture feature corresponding to the current picture block based on the probability distribution parameter, to obtain a second bitstream corresponding to the current picture block;
• and
• encoding an important channel identifier to obtain a third bitstream corresponding to the current picture block,
• wherein encoding the important channel identifier to obtain the third bitstream corresponding to the current picture block comprises:
• encoding a picture domain enhancement parameter to obtain the third bitstream,
• wherein the picture domain enhancement parameter is configured to perform, by a decoder, picture adaptive edge enhancement on an initial reconstructed picture block based on the picture domain enhancement parameter and the probability distribution parameter to obtain a target reconstructed picture block corresponding to the current picture block.

A decoding device, comprising:

• one or more processors;
• and
• one or more machine-readable storage media, wherein the one or more machine-readable storage media store machine executable instructions that can be executed by the one or more processors,
• wherein the one or more processors are configured to execute the machine executable instructions to perform operations comprising:
• decoding a bitstream corresponding to a current picture block to obtain a coefficient hyperparameter feature corresponding to the current picture block;
• determining a probability distribution parameter based on the coefficient hyperparameter feature;
• based on the probability distribution parameter, decoding a bitstream corresponding to the current picture block to obtain an initial reconstructed feature of the current picture block;
• and
• determining a target reconstructed picture block corresponding to the current picture block based on the initial reconstructed feature,
• wherein determining the target reconstructed picture block corresponding to the current picture block based on the initial reconstructed feature comprises:
• inputting the initial reconstructed feature into a synthesis transform network to obtain an initial reconstructed picture block corresponding to the current picture block;
• and
• based on the probability distribution parameter and a picture domain enhancement parameter corresponding to the current picture block, performing picture adaptive edge enhancement on the initial reconstructed picture block to obtain the target reconstructed picture block corresponding to the current picture block,
• wherein the picture domain enhancement parameter is obtained by decoding a bitstream corresponding to the current picture block.