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on 7 Oct 2021
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[x,y] = meshgrid(-128:127,-128:127);
z = sqrt(x.^2+y.^2);
c = (z<15);
cf = fftshift(fft2(c));
cf1 = log(1+abs(cf));
m = max(cf1(:));
figure,imshow(cf1/m);

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