Post Processing Technique to Reduce Tile Boundary Artifacts in JPEG2000 Compressed Images

摘要

This paper proposes a post-processing technique for reducing tile boundary artifacts which occur in an image when it is compressed at low bit rate using JPEG2000 standard. Symmetric extension and difference in quantization accuracy between the tiles of the image are the main factors behind the tile boundary artifacts in JPEG2000 compressed images. In this paper, we have analyzed the effect of quantization on the region of the tile boundaries of JPEG2000 compressed images. The analysis confirms that tiling artifacts are reduced by updating the high pass reconstructed samples lying on the boundary of the image tiles where the artifacts occur. The post-processing is applied on the output of JPEG2000 coding system and thus it can easily be blended with JPEG2000 standard.