Image deringing using quadtree based block-shift filtering

Guangtao Zhai, Jianfei Cai, Weisi Lin, Xiaokang Yang, Wenjun Zhang

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

3 Citations (Scopus)


In this paper, we propose an efficient spatial domain deringing algorithm using quadtree (QT) decomposition and block-shift filtering (BSF). The ringing artifacts are located through the QT decomposition of an image down to the 4 x 4 block size. The blocks with suspicious ringing are then replaced with the weighted average of itself and pixel-by-pixel shifted neighboring blocks. The block shifting range is up to 9 x 9 and only those shifted blocks resembling the center one are involved in the averaging stage. Experimental results show that the proposed deringing algorithm can effectively suppress the ringing artifact while preserving image edges and textures well, and the method substantially outperforms most of the existing deringing algorithms reported in the literature, both subjectively and objectively.

Original languageEnglish
Title of host publication2008 IEEE International Symposium on Circuits and Systems, ISCAS 2008
PublisherIEEE, Institute of Electrical and Electronics Engineers
Number of pages4
ISBN (Print)9781424416844
Publication statusPublished - 2008
Externally publishedYes
EventIEEE International Symposium on Circuits and Systems 2008 - Seattle, United States of America
Duration: 18 May 200821 May 2008 (Proceedings)


ConferenceIEEE International Symposium on Circuits and Systems 2008
Abbreviated titleISCAS 2008
Country/TerritoryUnited States of America
Internet address


  • Image deringing
  • Postfiltering
  • Quadtree decomposition

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