Artifact reduction in low bit rate DCT-based image compression

Authors:
Jiebo Luo;Chang Wen Chen;K. J. Parker;T. S. Huang
Affiliations:
Dept. of Electr. Eng., Rochester Univ., NY;-;-;-
Venue:
IEEE Transactions on Image Processing
Year:
1996

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Abstract

This correspondence presents a scheme for artifact reduction of low bit rate discrete-cosine-transform-compressed (DCT-compressed) images. First, the DC coefficients are calibrated using gradient continuity constraints. Then, an improved Huber-Markov-random-field-based (HMRF-based) smoothing is applied. The constrained optimization is implemented by the iterative conditional mode (ICM). Final reconstructions of typical images with improvements in both visual quality and peak signal-to-noise ratio (PSNR) are also shown