Optimal Pre- and Post-Processing for JPEG2000 Tiling Artifact Removal

摘要

This paper presents a pre-/post-filtering approach for JPEG 2000 tiling artifact removal, in which a pre-filter is applied at tile boundaries before wavelet compression, and a post-filter is invoked at the same locations after wavelet reconstruction. We first derive the optimal bit allocation and the corresponding boundary distortion for a given pre-/post-filter pair. The optimal pre-/post-filters are then obtained by minimizing the reconstruction error of the boundary filter bank. A low-complexity pre-/post-filter structure is proposed to approximate the optimal solutions, and its performance in JPEG2000 tiling artifact removal is demonstrated.