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Proceedings Paper

Signal loss recovery in DCT-based image and video codecs
Author(s): Yao Wang; Qin-Fan Zhu
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Paper Abstract

This paper presents a new technique fpr image reconstruction from a partial set of transform coefficients in DCT image coders. By utilizing the correlation between adjacent blocks and imposing smoothing constraints on the reconstructed image the proposed algorithm produces an image which is maximally smooth among all the images with the same available coefficients. The optimal solution can be obtained either by a linear transformation or through an iterative process. The underlying principle of the algorithm is applicable to any unitary block-transform and is very effective for recovering the DC and other low frequency coefficients. Applications in DCT based still image codecs and video codecs using motion compensation have been considered. Simulation results with still images show that a very good reconstruction can be obtained even when DC and certain low frequencies are missing in many blocks .

Paper Details

Date Published: 1 November 1991
PDF: 12 pages
Proc. SPIE 1605, Visual Communications and Image Processing '91: Visual Communication, (1 November 1991); doi: 10.1117/12.50300
Show Author Affiliations
Yao Wang, Polytechnic Univ. (United States)
Qin-Fan Zhu, Polytechnic Univ. (United States)


Published in SPIE Proceedings Vol. 1605:
Visual Communications and Image Processing '91: Visual Communication
Kou-Hu Tzou; Toshio Koga, Editor(s)

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