Image coding method and apparatus, image decoding method and apparatus, readable medium, and electronic device

An image decoding method, comprising:

• receiving a bit stream generated by an image encoding operation, wherein the image encoding operation comprises acquiring an original image and performing patching on the original image to obtain a plurality of image patches:
• calculating gradient values of pixels in each of the image patches and screening out key area patches from the plurality of image patches according to the gradient values of the pixels;
• and performing encoding by inputting the key area patches and position information of the key area patches in the original image into a vision transformation model to generate the bit stream;
• and
• decoding the bit stream, processing results of the decoding through normalization, a multi-head attention mechanism and a multi-layer perceptron, and outputting a reconstructed image.

An image encoding apparatus, comprising:

• at least one hardware processor;
• and
• a memory storing program instructions executable by the at least one hardware processor that when executed, direct the image encoding apparatus to:
• acquire an original image and perform image patching to obtain a plurality of image patches;
• calculate gradient values of pixels in each of the image patches, and screening out key area patches from the plurality of image patches according to the gradient values of the pixels;
• and
• perform encoding by inputting the key area patches and position information of the key area patches in the original image into a vision transformation model to generate a bit stream.