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Proceedings Paper

Two Channel Image Coding Scheme
Author(s): Diego P. de Garrido; Paulo Roberto R. L. Nunes; Jacques Szczupak
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Paper Abstract

In this paper we present a two channel image compression technique which allows good compression rates and image quality. The technique consists in splitting the image into two parts: a low-pass one, which represents the general area brightness without sharp contours, and the high-pass part containing mainly sharp edge information. This decomposition into low and high-frequency components was first presented in the so called Synthetic High System. The Synthetic Highs System exploits elegantly the properties of the visual system and consists in detecting and coding edges separately from low frequency components. The method proposed here follows the general idea of the Synthetic Highs System, though there is no edge-detection involved. Most of the contribution of our scheme relates to the way the two frequency bands are coded: transform coding for the low-pass part and vector quantization for the high-pass one. The system was tested using several monochromatic images with sizes 256 x 256 and 512 x 512; good results were obtained in terms of visual quality and peak signal-to-noise ratio. Blocking effects were not observed for the images tested.

Paper Details

Date Published: 1 November 1989
PDF: 8 pages
Proc. SPIE 1199, Visual Communications and Image Processing IV, (1 November 1989); doi: 10.1117/12.970113
Show Author Affiliations
Diego P. de Garrido, IBM Brasil Rio Scientific Center (Brazil)
Paulo Roberto R. L. Nunes, IBM Brasil Rio Scientific Center (Brazil)
Jacques Szczupak, Pontificia Universidade Catolica do Rio de Janeiro (Brazil)

Published in SPIE Proceedings Vol. 1199:
Visual Communications and Image Processing IV
William A. Pearlman, Editor(s)

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