Image compression using DCT

Image compression using  DCT

Program:-

clear all;

close all;

clc;

x= imread('cameraman.tif');

[M N]=size(x);

figure(1);

imshow(x);

s= double(x);

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)+1;

        b=sqrt(2/N);

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

     

    end

    end

end

F_DCT=c*s*c.';

I=uint8(F_DCT);

figure(2);

imshow(I);

Output :-  

Image 1:-

Image compression using  DCT (Image 1)

Image 2 :-

Image compression using  DCT (Image 2) 

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