图像的一维、二维快速傅里叶变化和反变化，可对图像一般低通滤波、ButterWorth低通滤波、一般高通滤波、ButterWorth高通滤波-Image of one-dimensional, two-dimensional fast Fourier change and anti-change, the image may be a general low-pass filter, ButterWorth low pass filter, the general high-pass filtering, ButterWorth high-pass filtering