Efficient contrast enhancement through log-power histogram modification

Alexander Toet; Tirui Wu

doi:10.1117/1.JEI.23.6.063017

16 December 2014 Efficient contrast enhancement through log-power histogram modification

Alexander Toet, Tirui Wu

Author Affiliations +

Journal of Electronic Imaging, Vol. 23, Issue 6, 063017 (December 2014). https://doi.org/10.1117/1.JEI.23.6.063017

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, overenhancement and unnatural effects in the processed images. Performance comparisons with several state-of-the-art contrast enhancement algorithms show that the proposed method achieves appreciable contrast enhancement under diverse conditions.

Citation Download Citation

Alexander Toet and Tirui Wu "Efficient contrast enhancement through log-power histogram modification," Journal of Electronic Imaging 23(6), 063017 (16 December 2014). https://doi.org/10.1117/1.JEI.23.6.063017

Published: 16 December 2014

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