MATLAB PROGRAM FOR DCT OF IMAGE

/*MATLAB PROGRAM FOR DCT OF IMAGE*/

clear all

clc

x=imread('cameraman.tif');

subplot(2,1,1)

imshow(x)

title('Original image')

x=double(x);

[m n]=size(x);

const=sqrt(2/n);

for u=0:1:n-1

for v=0:1:n-1

if u==0

c(u+1,v+1)=1/sqrt(n);

else

            a=2*v;

c(u+1,v+1)=const*cos((pi*(a+1)*u)/(2*n));

end

end

end

f=c*x*c'

subplot(2,1,2)

imshow(f)

title('DCT IMAGE')

OUTPUT