An efficient POCS-based post-processing technique using wavelet transform in HDTV

Goo Rak Kwon, Hyo Kak Kim, Yoon Kim, Sung Jea Ko

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


In this paper, we propose a new post-processing method, based on the theory of the projection onto convex sets (POCS) to reduce the blocking artifacts in digital high definition television (HDTV) decoded images. We propose a new smoothness constraint set (SCS) and its projection operator in the wavelet transform (WT) domain to remove unnecessary high-frequency components caused by blocking artifacts. We also propose a new method to find and preserve the original high frequency components of the image edge. Experimental results show that the proposed method can not only achieve a significantly enhanced subjective quality, but also exhibit the PSNR improvement in the output image.

Original languageEnglish
Pages (from-to)1283-1290
Number of pages8
JournalIEEE Transactions on Consumer Electronics
Issue number4
Publication statusPublished - 2005 Nov


  • POCS
  • Post-processing
  • QCS
  • SCS

ASJC Scopus subject areas

  • Media Technology
  • Electrical and Electronic Engineering


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