Efficient contrast enhancement through log-power histogram modification
conference paper
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.
Topics
Contrast enhancementHistogram modificationLog-pow operationDistribution functionsInfrared devicesTable lookupComputationally efficientContrast EnhancementCumulative distribution functionHistogram equalizationsHistogram modificationImage histogramsLog-pow operationState-of-the-art methodsGraphic methods
TNO Identifier
523234
ISSN
0277786X
ISBN
9781628413120
Publisher
SPIE
Article nr.
92490Q
Source title
Electro-Optical and Infrared Systems: Technology and Applications
Editor(s)
Huckridge, D.A.
Reinhard, E.
Reinhard, E.
Files
To receive the publication files, please send an e-mail request to TNO Repository.