采用OPENCV实现傅里叶正逆变换，在控制台下显示图像处理结果，处理的图片只针对方图，并且是2的幂次长度的图像,adopt the FFT tranformation and IFFT tranformation in OPENCV

实现正逆傅里叶变换，并在此基础上实现各种高低通滤波器，采用OPENCV实现。图像只针对2的整数次幂的方图-implement kinds of high filters and low filters in OPENCV based on implementing the FFTs and IFFTS.

进行快速傅立叶变换，输入的数据必须合法，只能是2的n次幂。并画出图形。也可以对复数信号在作图。-Fast Fourier transform, the input data must be legitimate, can only be two n-th power. And draw the graph. Complex can also signal mapping.