Use of second-order derivative-based smoothness measure for error concealment in transform-based codecs

Wenwu Zhu; Yao Wang

doi:10.1117/12.206654

21 April 1995 Use of second-order derivative-based smoothness measure for error concealment in transform-based codecs

Wenwu Zhu, Yao Wang

Proceedings Volume 2501, Visual Communications and Image Processing '95; (1995) https://doi.org/10.1117/12.206654
Event: Visual Communications and Image Processing '95, 1995, Taipei, Taiwan

Abstract

In this paper, we study the recovery of lost or erroneous transform coefficients in image communication systems employing block transform codecs. Previously, Wang et al. have developed a technique that exploits the smoothness property of image signals, and recovered 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 the edge blurring problem of this method, in this paper, we study the use of second order derivatives as the smoothness measure, including the quadratic variation and the Laplacian operators. 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.

Citation Download Citation

Wenwu Zhu and Yao Wang "Use of second-order derivative-based smoothness measure for error concealment in transform-based codecs", Proc. SPIE 2501, Visual Communications and Image Processing '95, (21 April 1995); https://doi.org/10.1117/12.206654

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