本例主要说明了空间域滤波与频域滤波的比较！在空间域中采用了Sobel掩膜对f滤波的结果与在频域中进行等价操作的结果！-This example illustrates the spatial filtering mainly with the comparison of frequency domain filtering! In the spatial domain using the Sobel filter mask on the results of f in the frequency domain is equivalent with the result of the operation!