A Brightness Preserving Contrast Enhancement Method Based on Clipped Histogram Equalization

Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 222)


A good brightness preserving contrast enhancement method has several applications especially in consumer electronics. A novel contrast enhancement method based on histogram equalization has been proposed in this paper. The method divides the histogram of an image into four sub histograms. Then, clipping is applied on each sub histogram. The clipping threshold of each sub histogram is taken as the difference between the median and standard deviation of the occupied intensities which gives a smoother cumulative distribution function and leads to better equalization of the sub histograms resulting in a good enhancement. Each sub histogram is assigned a new range and histogram equalization is done independently.


Contrast enhancement Brightness preserving Histogram equalization Standard deviation 


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Copyright information

© Springer India 2013

Authors and Affiliations

  1. 1.Department of Computer ScienceUniversity of KeralaThiruvananthapuramIndia

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