MATLAB Program to apply Histogram Equalization on image

MATLAB Program to apply Histogram Equalization on image

Code

clear all
clc
I=imread('cameraman.tif');
I=double(I);
maximum_value=max((max(I)));
[row col]=size(I);
c=row*col;
h=zeros(1,300);
z=zeros(1,300);
for n=1:row
for m=1:col
if I(n,m) == 0
I(n,m)=1;
end
end
end
for n=1:row
for m=1:col
t = I(n,m);
h(t) = h(t) + 1;
end
end
pdf = h/c;
cdf(1) = pdf(1);
for x=2:maximum_value
cdf(x) = pdf(x) + cdf(x-1);
end
new = round(cdf * maximum_value);
new= new + 1;
for p=1:row
for q=1:col
temp=I(p,q);
b(p,q)=new(temp);
t=b(p,q);
z(t)=z(t)+1;
end
end
b=b-1;
subplot(2,2,1), imshow(uint8(I)) , title(' Image1');

subplot(2,2,2), bar(h) , title('Histogram of d Orig. Image');

subplot(2,2,3), imshow(uint8(b)) , title('Image2');

subplot(2,2,4),bar(z) , title(‘Histogram Equalisation of image2');

Output Of An Histogram Equalization