Image coding method, image decoding method, image coding device and image decoding device

The invention discloses an image coding method, an image decoding method, an image coding device and an image decoding device, relates to the field of image processing, and can solve the problem that an image coding way in the prior art is not flexible enough. The specific scheme is as follows: obtaining a first image, compressing the first image to generate a second image, and coding the second image to generate a first bit stream, wherein the resolution of the second image is smaller than that of the first image; determining a parameter corresponding to the first image in a stored parameter database and generating a second bit stream based on the parameter corresponding to the first image, wherein the parameter corresponding to the first image is in mutual correspondence with detail information contained in the first image; and combining the first bit stream and the second bit stream into a transmission bit stream. The image coding method is used for image coding.