图像频率域的变换方法集合，含有fft,dct,wavlet等-Image Transform the frequency domain method pool, containing fft, Copy, etc. wavlet

对图像进行各种频域变换，包括小波变换，FFT变换，DTC变换以及反变换-A variety of image frequency domain transformation, including the wavelet transform, FFT transform, DTC transform and inverse transform