Image encoding scheme in an edge field with the Laplacian operator

Gee-Hyuk Lee; Dong-Woo Kim; Sang-Baek Han; Soo-Yong Kim

doi:10.1117/12.188320

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1 January 1995 Image encoding scheme in an edge field with the Laplacian operator

Gee-Hyuk Lee, Dong-Woo Kim, Sang-Baek Han, Soo-Yong Kim

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Optical Engineering, 34(1), (1995). https://doi.org/10.1117/12.188320

Abstract

Most of the existing lossy encoding schemes rely on the stochastic image model with a spatially uniform correlation and show decreasing performance as sharp edge features increase in images. To cope with images where sharp edge features convey more important information, a relatively new encoding scheme utilizing a Laplacian edge detector is proposed and experimented with prototype sample images. In this scheme, the Laplacian operator is applied to an image to get a corresponding edge field and, in turn, the edge field is encoded with the Huffman code. A quantization, a fundamental information reduction step, is also carried out in the edge field, and the corresponding error field, the overall intensity variations, is approximated with some discrete sine transform coefficients. A compression ratio up to 5 or 6 can be achieved with the current implementation without a severe degradation of image quality. An implementation with an image divided into tiles and an extension to an hierarchical model will be studied in the future.

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Gee-Hyuk Lee, Dong-Woo Kim, Sang-Baek Han, and Soo-Yong Kim "Image encoding scheme in an edge field with the Laplacian operator," Optical Engineering 34(1), (1 January 1995). https://doi.org/10.1117/12.188320

Published: 1 January 1995

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