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clear all;
path1='c:\imagedata\';
imgname = input('please input image name:      ');
filename = [path1, imgname,'.jpg'];
X1= imread(filename);
figure(1);
imshow(X1);
f=double(X1);
g=fft2(f);
g=fftshift(g);
[N1,N2,N3]=size(g);
n=8;
d0=1.414;
n1=fix(N1/2);
n2=fix(N2/2);
for i=1:N1
     for j=1:N2
         d=sqrt((i-n1)^2+(j-n2)^2);
h=1/(1+(d/d0)^(2*n));
      result(i,j)=h*g(i,j);
     end
end
result = ifftshift(result);
X2=ifft2(result);
X3=uint8(real(X2));
figure(2);
imshow(X3);
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[search]butterworth[/search]
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