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Block overlapped intensity-pair distribution approach for image contrast enhancement.

Author(s)
Md. Hasanul Kabir Computer Engineering Department, Kyung Hee University, 1 Seochun-ri, Kiheung-eup, Yongin-si, Kyunggi-do, South Korea
M. Abdullah Al-Wadud Computer Engineering Department, Kyung Hee University, 1 Seochun-ri, Kiheung-eup, Yongin-si, Kyunggi-do, South Korea
Mohammad A. U Khan Department of Electrical Engineering, Comsats Institute of Information Technology, Abbottabad, Pakistan
Abdur Rashid Department of Electrical Engineering, Comsats Institute of Information Technology, Abbottabad, Pakistan
Saghir Ahmad Department of Electrical Engineering, Comsats Institute of Information Technology, Abbottabad, Pakistan
Abstract
In this study, the authors present an image contrast enhancement method based on block-wise intensity pair distribution. The proposed algorithm takes the local intensity-pair distribution, instead of using the intensity-pair distribution of the whole image. To deal with the issues of contrast stretch and over-enhancement, a linear magnitude mapping function is used as a substitute to a non-linear one. This linear mapping preserves the relative contrast enhancement ratio between the gray levels. The local information from blocks facilitates contrast enhancement, enhances subtle edge information and eliminates noises from the image. The proposed algorithm is suitable for detail analysis of image features.
Publication Details
Page(s) 897-902
DOI DOI not available
Published Journal: Information technology Journal, Volume: 6, Issue: 6, Year: 2007

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