Matlab programming of DCT and FFT

Feb 3rd, 2012
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Matlab programming of DCT and FFT. Just copy the programme and run with MATLAB Software. dont forget give the path of the image. Matlab programming of DCT and FFT

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clear all;p=imread('kaka.jpg'); %%%%%%%%%%%give path of the picturea=imresize(p,[100,100]);%DCTZ(:,:,1)=dct2(a(:,:,1));Z(:,:,2)=dct2(a(:,:,2));Z(:,:,3)=dct2(a(:,:,3)); for i=1:100 for j=1:100 if((i+j)>60) Z(i,j,1)=0; Z(i,j,2)=0; Z(i,j,3)=0; end endendK(:,:,1)=idct2(Z(:,:,1));K(:,:,2)=idct2(Z(:,:,2));K(:,:,3)=idct2(Z(:,:,3));subplot(2,4,1);%imshow(Z);imshow(uint8(K));title('70% compression');Z(:,:,1)=dct2(a(:,:,1));Z(:,:,2)=dct2(a(:,:,2));Z(:,:,3)=dct2(a(:,:,3)); for i=1:100 for j=1:100 if((i+j)>100) Z(i,j,1)=0; Z(i,j,2)=0; Z(i,j,3)=0; end endendK(:,:,1)=idct2(Z(:,:,1));K(:,:,2)=idct2(Z(:,:,2));K(:,:,3)=idct2(Z(:,:,3));subplot(2,4,2);%imshow(Z);imshow(uint8(K));title('50% compression');Z(:,:,1)=dct2(a(:,:,1));Z(:,:,2)=dct2(a(:,:,2));Z(:,:,3)=dct2(a(:,:,3)); for i=1:100 for j=1:100 if((i+j)>140) Z(i,j,1)=0; Z(i,j,2)=0; Z(i,j,3)=0; end endendK(:,:,1)=idct2(Z(:,:,1));K(:,:,2)=idct2(Z(:,:,2));K(:,:,3)=idct2(Z(:,:,3))

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