Combining DCT and subband coding into an intraframe coder

Bellifemine, Fabio; Cafforio, C.; Chimienti, Antonio; Picco, R.

doi:10.1016/0923-5965(93)90039-v

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Subband Decomposition1

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2001

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Cited by 4 publications

(1 citation statement)

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“…6 As contributions to the value of a sample come from an area of limited extent in the original image d, subimages retain some vestige of the image structure. To avoid a redundant description, critical subsampling is used.…”

Section: Subband Decompositionmentioning

confidence: 99%

Edge enhancement for subband-coded images

Cafforio

2001

Opt. Eng

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Subband coding is a well-established technique. Coding algorithms, however, rarely try to exploit residual similarities between subbands in order to get both coding gain and improvement in visual appearance. In this work we propose a simple postprocessing technique for edge enhancement and ringing-artifact reduction in subband-coded images. The proposed technique employs morphological filtering for preliminary image simplification and uses a novel dual-window nonlinear operator for subsequent edge enhancement. Visual appearance and numerical results confirm the validity of the approach. A simple coding scheme, designed to test the efficiency of the approach, gives good results.

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Section: Subband Decompositionmentioning

confidence: 99%