Optimal Block Boundary Pre/Postfiltering for Wavelet-Based Image and Video Compression

This paper presents a pre/postfiltering framework to reduce the reconstruction errors near block boundaries in waveletbased image and video compression. Two algorithms are developed to obtain the optimal filter, based on boundary filter bank and polyphase structure, respectively. A low-complexity structure is employed to approximate the optimal solution. Performances of the proposed method in the removal of JPEG 2000 tiling artifact and the jittering artifact of three-dimensional wavelet video coding are reported. Comparisons with other methods demonstrate the advantages of our pre/postfiltering framework.