Second-order derivative-based smoothness measure for error concealment in DCT-based codecs

Wenwu Zhu, Yao Wang, Qin Fan Zhu

Research output: Contribution to journalArticlepeer-review


In this paper, we study the recovery of lost or erroneous transform coefficients in image and video communication systems employing discrete cosine transform (DCT)-based codecs. Previously, we have developed a technique that exploits the smoothness property of image signals and recovers the damaged blocks by maximizing a smoothness measure. There, the first-order derivative was used as the smoothness measure, which can lead to the blurring of sharp edges. In order to alleviate this problem, we propose to use second-order derivatives as the smoothness measure. Our simulation results show that a weighted combination of the quadratic variation and the Laplacian operator can significantly reduce the blurring across the edges while enforcing smoothness along the edges.

Original languageEnglish (US)
Pages (from-to)713-718
Number of pages6
JournalIEEE Transactions on Circuits and Systems for Video Technology
Issue number6
StatePublished - 1998


  • DCT-based codec
  • Error concealment
  • Image communications
  • Packet loss recovery
  • Second-order derivative
  • Smoothness measure

ASJC Scopus subject areas

  • Media Technology
  • Electrical and Electronic Engineering


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