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Optimal block boundary pre/post-filtering for wavelet-based image and video compression

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3 Author(s)
Jie Liang ; Sch. of Eng. Sci., Simon Fraser Univ., Burnaby, BC, Canada ; Chengjie Tu ; Tran, T.D.

This paper presents a pre/post-filtering method to reduce the reconstruction errors near block boundaries in wavelet-based image and video compression. It can be used effectively to mitigate the tiling artifact in JPEG2000 and the jittering artifact in 3D wavelet-based video compression. In this method, a short prefilter is applied across the boundaries of image tiles or video frame groups before wavelet compression, and a post-filter is applied at the same place after wavelet reconstruction. The optimal pre/postfilter is obtained by formulating and solving the corresponding rate-distortion optimization problem. A low-complexity structure is then proposed to approximate the optimal solution. The performance of the proposed method is demonstrated by both image and video coding examples.

Published in:

Image Processing, 2004. ICIP '04. 2004 International Conference on  (Volume:1 )

Date of Conference:

24-27 Oct. 2004