Tiling artifact reduction based on max-lift wavelet filter for Motion JPEG2000 at low bit-rate

Using a JPEG2000 image sequence at low bit rate as video source, named Motion JPEG2000, is very promising and interesting. However, JPEG2000 also causes higher complexity of implementation. In practice, in JEPG2000 coding systems, an image is segmented into serial tiles and each tile is compressed or transformed independently, thus creating tiling artifacts in the tile boundary. At low bit rate, tiling artifacts in JPEG2000 images are annoying. This paper introduces a new post-processing method to reduce this artifact, where max-lift wavelet subband decomposition was used and then subband coefficients were adaptively filtered and soft-thresholded. Experiments showed that the post-processing was effective to obviously enhance the visual quality of the JPEG2000 image at low bit rate. This helps improve subjective quality of the Motion JPEG2000 video.