说明：  采用OPENCV封装的图像二维DFT运算，通过该类可生成图像二维傅里叶变换矩阵，通过可选参数可调整生成傅里叶矩阵、傅里叶频谱同时可选择对数加强属性增强傅里叶频谱的显示效果。
(OPENCV package using two-dimensional DFT computation of image, the image can be generated through such two-dimensional Fourier transform matrix generated by the optional parameter adjustable Fourier matrix, Fourier spectrum also can choose the number of enhancing properties of the enhanced fourier leaves the spectrum display.)