Signal loss recovery in DCT-based image and video codecs

Yao Wang; Qin-Fan Zhu

doi:10.1117/12.50300

1 November 1991 Signal loss recovery in DCT-based image and video codecs

Yao Wang, Qin-Fan Zhu

Proceedings Volume 1605, Visual Communications and Image Processing '91: Visual Communication; (1991) https://doi.org/10.1117/12.50300
Event: Visual Communications, '91, 1991, Boston, MA, United States

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 .

Citation Download Citation

Yao Wang and Qin-Fan Zhu "Signal loss recovery in DCT-based image and video codecs", Proc. SPIE 1605, Visual Communications and Image Processing '91: Visual Communication, (1 November 1991); https://doi.org/10.1117/12.50300

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