说明：  这个是C制作的源代码。。。对一幅图像进行DFT变换，分别对对源图像在空间域和频域里进行二次抽样和差值，最后得出结果比较。
(This is the C source code produced. . . DFT transform, an image of the source image to the second sampling and the difference in the spatial domain and frequency domain, the final outcome of the comparison.)