说明：  用于频域滤波的m函数，接受输入一幅图像和一个滤波函数，输出经滤波和剪切后的图像。还有一个高通滤波函数。
(For frequency domain filtering m function, to accept the importation of an image and a filter function, the output cut by the filtering and image. There is also a high-pass filtering function.)