An Algorithm for Reductionof Blocking Effects Based on Image Representation Using Wavelet Transform Extreme
一种基于图象小波极值表示的减少方块效应的算法

Low bit rate JPEG compressed images demonstrate serious blocking effect. Post processing is an effective way to reduce the artifact blocking effects.A post processing algorithm based on image wavelet extreme representation is studied in this paper. It is noted that in the wavelet domain, blocking effect can display the artifact wavelet transform modulus maxima at block boundaries. To take account of reducing blocking effects and maintaining original image edges, the maxima corresponding to block boundaries in the different region of image are processed in different ways. Experimental results show that the proposed method can significantly reduce blocking artifacts and improve PSNR and visual quality.