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http://dx.doi.org/10.5909/JBE.2014.19.1.96

Histogram Equalization based on Differential Compression for Image Contrast Enhancement  

Lee, Jae-Won (Dept. of Electronic and Computer Engineering, Chonnam National University)
Hong, Sung-Hoon (School of Electronic and Computer Engineering, Chonnam National Univ. & Information and Telecommunication Research Institute)
Publication Information
Journal of Broadcast Engineering / v.19, no.1, 2014 , pp. 96-108 More about this Journal
Abstract
In case of contrast of the image enhancement by using the conventional histogram equalization, over-enhancement, false contouring and distortion such as the details disappearance of the image occurs due to the excessive brightness change. Especially, these distortion appears when the brightness distribution is concentrated in a particular brightness level. In order to solve these problems, improved histogram equalization methods to transform the input histogram by clipping using threshold have been proposed, but contrast enhancement effect is reduced because it does not consider the characteristics of the input image's histogram to apply the same threshold for the entire histogram, and unnatural image is obtained because it does not retain the characteristics of the image. In this paper, to solve the problems of existing methods, we propose new equalization method that suppress excessive brightness changes by applying to the differential compression according to the histogram frequency, and maintain the characteristics of the input image. In addition, we propose a more effectively method to improve contrast by controlling the strength of the compression ratio depending on the characteristics of the input image.
Keywords
Histogram Equalization; Histogram Compression; Contrast Enhancement;
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Times Cited By KSCI : 1  (Citation Analysis)
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