Program for Histogram Equalization using Matlab

Histogram Equalization

Histogram equalization is a technique for adjusting image intensities to enhance contrast. Let f be a given image represented as a m x n matrix of integer pixel intensities ranging from 0 to L − 1. L is the number of possible intensity values, often 256.

Program: 

clc;

clear all;

close all;

a=imread('D:\sample.jpg');

c=rgb2gray(a);

b=histeq(c);

subplot(2,2,1);

imshow(c);

title('original image');

subplot(2,2,2);

imshow(b);

title('After histrogram equalization');

subplot(2,2,3);

imhist(c,255);

title('original image Histogram plot')

subplot(2,2,4);

imhist(b,255);

title('equalized Histogram plot')

Output: