Reduction of blocking artifacts for highly compressed images based on discrete cosine transform domain
基于DCT域的高压缩图像去块效应算法

A major drawback of block discrete cosine transform(BDCT) is that the decoded images,especially at very low bit rates,exhibit highly noticeable blocking artifacts near the block boundaries.A blocking reduction algorithm in DCT domain is proposed to reduce blocking artifacts as many as possible,while preserving edge information.The characteristic of Human visual system(HVS) is extensively utilized in this paper.The model of blocking artifacts is built and a convenient edge detection measurement is introduced. For smooth regions,the step block is replaced with linear block and the parameter that affects blocking artifacts is modified.The DCT-domain post-filtering method is applied to the updated blocks and texture regions.The experiment results show the effectiveness of the proposed algorithm.