Saurabh Chaudhury; Ananta Kumar Roy

Histogram Equalization-A Simple but Efficient Technique for Image Enhancement

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Author(s)

Saurabh Chaudhury ^1,* Ananta Kumar Roy ¹

1. Department of Electrical Engineering, National Institute of Technology, Silchar, Assam, India

* Corresponding author.

DOI: https://doi.org/10.5815/ijigsp.2013.10.07

Received: 29 Mar. 2013 / Revised: 15 May 2013 / Accepted: 27 Jun. 2013 / Published: 8 Aug. 2013

Index Terms

Image processing, Histogram Equalization, Contrast Enhancement, global equalization, local equalization

Abstract

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.

Cite This Paper

Saurabh Chaudhury, Ananta Kumar Roy,"Histogram Equalization-A Simple but Efficient Technique for Image Enhancement", IJIGSP, vol.5, no.10, pp.55-62, 2013. DOI: 10.5815/ijigsp.2013.10.07

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International Journal of Image, Graphics and Signal Processing (IJIGSP)