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f(5:24,13:17)=1;
imshow(f, 'notruesize');
F=fft2(f,256,256); % 快速傅立叶变换算法只能处矩阵维数为2的幂次,f矩阵不
F2=fftshift(F);
figure,imshow(log(abs(F2)),[-1 5],'notruesize');
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