Ananta Kumar Roy

Work place: Department of Electrical Engineering, National Institute of Technology, Silchar, Assam, India



Research Interests: Engineering


Ananta Kumar Roy was a graduate student of Electrical Engineering, National Institute of Technology Silchar, Assam, India during 2008-2012 and obtained his B.Tech degree from NIT Silchar in the month of June 2012 in Electrical Engineering. He has contributed to the paper through his project work under my supervision and guidance. He was a sincere and dedicated student throughout. Currently he is working with Coal India Limited, India, as Management Trainee.

Author Articles
Histogram Equalization-A Simple but Efficient Technique for Image Enhancement

By Saurabh Chaudhury Ananta Kumar Roy

DOI:, Pub. Date: 8 Aug. 2013

This paper demonstrates the significance of histogram processing of an image particularly the histogram equalization (HE). It is one of the widely used image enhancement technique. It has become a popular technique for contrast enhancement because the method is simple and effective. The basic idea of HE is to re-map the gray levels of an image. Here we propose two different techniques of Histogram Equalization namely, the global HE and local HE. The Histogram Equalization has been performed in the MATLAB environment. The merits and demerits of both techniques of Histogram Equalization have also been discussed. It is seen after exhaustive experimentation on a number of sample images that the proposed image enhancement techniques can be considered as an improvement over the inbuilt MATLAB function histeq.

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