Blocking artifact reduction in compressed images based on edge-adaptive quadrangle meshes

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

15 Scopus Citations
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  • Xiangchao Gan
  • Alan Wee-Chung Liew
  • Hong Yan


Original languageEnglish
Pages (from-to)492-507
Journal / PublicationJournal of Visual Communication and Image Representation
Issue number4
Publication statusPublished - Dec 2003


During image deblocking, the preservation of visually significant edges in the image is important. Based on the observation that blocking artifact along edge direction is difficult for human perception, a number of existing techniques have proposed to filter the edge pixels with low weight or bypass them altogether to avoid blurring. However, the un-processed artifacts that are anti-parallel to the edge direction often fragment the edges and seriously degrade visual quality. In this paper, by considering the behavior of intensity evolution along and across edges, we propose a new POCS-based algorithm using a new smoothness constraint set. The new constraint set is realized indirectly by limiting the distance between the coded image and the image simulated using edge-adaptive quadrangle meshes. Experimental results indicated that our method compares favorably with several existing techniques. © 2003 Elsevier Inc. All rights reserved.

Research Area(s)

  • Adaptive mesh, Blocking artifacts, Image postprocessing, Projections onto convex sets, Quantization constraint set, Smoothness constraint set