Edge Map Based Blocking Artifacts Reduction

Blocking artifacts are significant problem in DCT-based image compression, which introduce the apparent distortion of visual quality. In this paper, an effective blocking artifacts deduction method is proposed. Compared with other existed method, firstly, fast edges map identification was done in compressed data. Secondly, an adaptive criterion of block type is introduced according to DCT coefficients distribution in the half-block-size shifted image block and also in the original source image blocks. With the help of the above classification, an adaptively compound method is carried out to reduce the blocking effects. Since all the computation is performed in DCT domain, the compressibility of the original image is not affected. Furthermore, experiment results verified the effectiveness of our new method.