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Proceedings Paper

An Adaptive Preprocessing Technique For Shading Correction, Contrast Enhancement, And Thresholding
Author(s): Sudhir S. Dixit
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Paper Abstract

A method for adaptively correcting for shading due to variations in illumination and imaging system imperfections, while at the same time reducing the number of gray levels in the original image on a pixel-by-pixel basis was developed. The two operations - shading correction and gray level reduction - are done in a single pass over the image and the local properties of the pixel being processed are utilized. Each scanline of the captured original image is processed independently enabling parallel processing of the scanlines to reduce the time to process the complete image. The technique described herein is applicable generally to any imaging system which is designed to work on reduced number of gray-levels. Through examples, it is shown that the resulting processed image has enhanced contrast, uniform background intensity, reduced number of gray levels (resulting in compression), and smoother edges (reducing staircasing) in multilevel images.

Paper Details

Date Published: 3 June 1987
PDF: 6 pages
Proc. SPIE 0757, Methods of Handling and Processing Imagery, (3 June 1987); doi: 10.1117/12.940049
Show Author Affiliations
Sudhir S. Dixit, Wang Laboratories, Inc. (United States)


Published in SPIE Proceedings Vol. 0757:
Methods of Handling and Processing Imagery
Julian Marshall, Editor(s)

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