Deringing cartoons by image analogies
ACM Transactions on Graphics (TOG)
Pre- and post-shift filtering for blocking removing in downsizing transcoding
IEEE Transactions on Circuits and Systems for Video Technology
A Total Variation-Based JPEG Decompression Model
SIAM Journal on Imaging Sciences
A linear-time combinatorial algorithm to find the orthogonal hull of an object on the digital plane
Information Sciences: an International Journal
A training-based method for reducing ringing artifact in BDCT-encoded images
EGMM'04 Proceedings of the Seventh Eurographics conference on Multimedia
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A novel protection onto convex sets (POCS) method is presented for the suppression of blocking and ringing artifacts in a compressed image that contains homogeneous regions. A new family of convex smoothness constraint sets is introduced, using the uniformity property of image regions. This set of constraints allows different degrees of smoothing in different regions of the image, while preserving the image edges. The regions are segmented using the fuzzy c-means algorithm, which allows ambiguous pixels to be left unclassified. Experimental results on JPEG compressed images demonstrate that the proposed algorithm yields visually superior images compared to several of the previously reported POCS deblocking algorithms for the class of images considered.