Histogram equalization without built-in function | MATLAB
Code:
clc
clear all
close all
warning off;
x=imread('tire.tif');
subplot(3,2,1);
imshow(x);
title('Original Image');
subplot(3,2,2);
imhist(x);
title('Histogram of Original Image using built in function');
axis tight;
h=zeros(1,256);
[r c]=size(x);
totla_no_of_pixels=r*c;
n=0:255;
%%
j=histeq(x);
subplot(3,2,3);
imshow(j);
title('Histogram Equalization using built in function');
subplot(3,2,4);
imhist(j);
axis tight;
title('Histogram Equalization using built in function');
%%
%Calculating Histogram without built-in function
for i=1:r
for j=1:c
h(x(i,j)+1)=h(x(i,j)+1)+1;
end
end
%%
%Calculating Probability
for i=1:256
h(i)=h(i)/totla_no_of_pixels;
end
%%
%Calculating Cumulative Probability
temp=h(1);
for i=2:256
temp=temp+h(i);
h(i)=temp;
end
%%
%Mapping
for i=1:r
for j=1:c
x(i,j)=round(h(x(i,j)+1)*255);
end
end
subplot(3,2,5);
imshow(x);
title('Histogram Equalized image using own code');
subplot(3,2,6);
imhist(x);
axis tight;
title('Histogram Equalization using own code');
Prerequisite:
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• When ENTROPY is MAX??(Intuitive Idea)
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