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JBE, vol. 22, no. 5, pp.608-617, September, 2017

DOI: https://doi.org/10.5909/JBE.2017.22.5.608

Contrast Enhancement based on Gaussian Region Segmentation

Woosung Shim

C.A E-mail: willshim@gmail.com

Abstract:

Methods of contrast enhancement have problem such as side effect of over-enhancement with non-gaussian histogram distribution, tradeoff enhancement efficiency against brightness preserving. In order to enhance contrast at various histogram distribution, segmentation to region with gaussian distribution and then enhance contrast each region. First, we segment an image into several regions using GMM(Gaussian Mixture Model)fitting by that k-mean clustering and EM(Expectation-Maximization) in L*a*b* color space. As a result region segmentation, we get the region map and probability map. Then we apply local contrast enhancement algorithm that mean shift to minimum overlapping of each region and preserve brightness histogram equalization. Experiment result show that proposed region based contrast enhancement method compare to the conventional method as AMBE(AbsoluteMean Brightness Error) and AE(Average Entropy), brightness is maintained and represented detail information.



Keyword: willshim@gmail.com

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