说明：  1、对图像进行Fourior变换，并将图像的Fourior中心化，显示中心化后的三维频谱图及在各个坐标平面上的投影图像； 2、对图像进行fourior变换，分别运用(-1)(x+y)*f(x,y)的方法和fftshift的方法将变换后的频谱图中心化，并解释该程序的意义。 3、对图像进行fourior变换，分别显示变换后的实部图像，虚部图像，频谱图像和相角图像，比较说明各个图像与原图像之间有何联系。
(1. Fourier transform is applied to the image and Fourier centralization is used to display the centralized three-dimensional spectrum and projection image on each coordinate plane. 2. Fourier transform is used to transform the image. The (-1)(x+y)*f(x,y) method and fftshift method are used to centralize the transformed spectrum, and the significance of the program is explained. 3. Fourier transform is used to display the real part image, the imaginary part image, the spectrum image and the phase angle image respectively. The comparison shows how each image relates to the original image.)