A method and an apparatus for extracting a noise of a compressed image and a method and an apparatus for reducing a noise of a compressed image

摘要

A first image is obtained by applying a convolution filter that sequentially performs down-convolution and up-convolution corresponding to the down-convolution to the compressed image of the original image, and the first image is subtracted from the compressed image. 2 images are obtained, noise including high frequency information of the compressed image and compression artifacts is obtained from the second image, and a compression artifact removal DNN is applied to the noise to remove compression artifacts to obtain a third image, , proposes a method of reducing noise in a compressed image by reconstructing the compressed image by adding the first image and the third image.