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Proceedings Paper

Efficient contrast enhancement through log-power histogram modification
Author(s): Tirui Wu; Alexander Toet
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Paper Abstract

A simple power-logarithm histogram modification operator is proposed to enhance digital image contrast. First a logarithm operator reduces the effect of spikes and transforms the image histogram into a smoothed one that approximates a uniform histogram while retaining the relative size ordering of the original bins. Then a power operator transforms this smoothed histogram into one that approximates the original input histogram. Contrast enhancement is then achieved by using the cumulative distribution function of the resulting histogram in a standard lookup table based histogram equalization procedure. The method is computationally efficient, independent of image content, and (unlike most existing contrast enhancement algorithms) does not suffer from the occurrence of artifacts, over-enhancement and unnatural effects in the processed images. Experimental results on a wide range of different images show that the proposed method effectively enhances image contrast while preserving overall image brightness, and yields results that are comparable or even of higher quality than those provided by previous state-of-the-art methods.

Paper Details

Date Published: 7 October 2014
PDF: 14 pages
Proc. SPIE 9249, Electro-Optical and Infrared Systems: Technology and Applications XI, 92490Q (7 October 2014); doi: 10.1117/12.2064971
Show Author Affiliations
Tirui Wu, Ford Motor Research & Engineering (China)
Alexander Toet, TNO Defence, Security and Safety (Netherlands)
Utrecht Univ. (Netherlands)

Published in SPIE Proceedings Vol. 9249:
Electro-Optical and Infrared Systems: Technology and Applications XI
David A. Huckridge; Reinhard Ebert, Editor(s)

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