MATLAB Code For HISTOGRAM Comparison Of Images

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

close all

clc;

clear all;

im= imread(input('Enter the name of image :  ',  's'));

im = rgb2gray(im);

im_0=histeq(im);

im_1=exact_histogram(im);

H=imhist(im);

H_0=imhist(im_0);

H_1=imhist(im_1);

% Original image

%--------------------------------------------------------------------------

figure('color',[1 1 1]) 

h_im=axes('units','normalized','position',[0.05 0.1 0.4 0.8]);

imshow(im)

h_h=axes('units','normalized','position',[0.55 0.1 0.4 0.8]);

bar(0:255,H,'b');

set(h_h,'xlim',[0 255],'FontSize',15,'FontWeight','bold')

set(get(h_h,'Title'),'String','Original Image','FontSize',20,'FontWeight','bold')

Ylim_ref=get(h_h,'ylim');

% Classical histogram equalization

%--------------------------------------------------------------------------

figure('color',[1 1 1]) 

h_im=axes('units','normalized','position',[0.05 0.1 0.4 0.8]);

imshow(im_0)

h_h=axes('units','normalized','position',[0.55 0.1 0.4 0.8]);

bar(0:255,H_0,'b');

set(h_h,'xlim',[0 255],'ylim',Ylim_ref,'FontSize',15,'FontWeight','bold')

set(get(h_h,'Title'),'String','Classical Histogram Equalization','FontSize',20,'FontWeight','bold')