title: Artifact reduction in low bit rate DCT-based image compression.
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.
authors.affiliation: Dept. of Electr. Eng., Rochester Univ., NY.
authors.forename: J
authors.initials: J
authors.lastname: Luo
authors.forename: C W
authors.initials: CW
authors.lastname: Chen
authors.forename: K J
authors.initials: KJ
authors.lastname: Parker
authors.forename: T S
authors.initials: TS
authors.lastname: Huang