Artifact reduction in low bit rate DCT-based image compression |
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| Authors: | Jiebo Luo Chang Wen Chen Parker K.J. Huang T.S. |
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| Affiliation: | Dept. of Electr. Eng., Rochester Univ., NY. |
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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. |
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