Post-processing for artifact reduction in JPEG-compressed images
J.K. Su, Russell M. Mersereau · 2002
An iterative post-processing algorithm for reducing blocking and ringing in block transform-coded images is presented. It smooths the decompressed image and uses convex projections theory to preserve the image's edges and bit-stream. The algorithm exploits the coding scheme's block structure and ringing behavior. In experiments it outperforms an existing method and gives significant subjective and objective improvement over the decompressed image. Sufficient conditions for algorithm convergence are given.