离散Fourier Triansform实现

clear all;
close all;
clc;

%title('Fourier Transform','positon');
f = zeros(30,30);
f(5:24,13:17) =1;

subplot(2,2,1);
imshow(f,'InitialMagnification','fit');
title('Gray Image');

F = fft2(f);
F1 = log(abs(F));
subplot(2,2,2);
imshow(F1,[-1 5],'InitialMagnification','fit');
title('DFT Computed Without Padding');
colormap(jet);
colorbar;

F2 = fft2(f,256,256);
subplot(2,2,3);
imshow(log(abs(F2)),[-1,5]);
title('DFT Computed With Padding');
colormap(jet);
colorbar;

F3 = fftshift(F2);
subplot(2,2,4);
imshow(log(abs(F3)),[-1,5]);
title('DFT Computed With Padding and Sfit');
colormap(jet);
colorbar;

输出结果：

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