对图像进行傅里叶变换，其频谱图能量集中在一点，通过对其对比度进行扩展，则图像的频谱图更加清晰，本程序实现了此过程。-Fourier transform of the image, and its energy concentrated in the frequency spectrum that the expansion of its contrast, the frequency spectrum of the image more clearly, the procedures for t