对图像进行频域滤波，调用时需要提供原始图像和与原图像等大的频域滤波器作为参数，输出为经过滤波处理后又反变换回空域之后的图像。-The image frequency domain filtering, called the original image and the need to provide the original images with a large frequency domain filter as a parameter, then the output is filtered through the inverse transformation back to the image after the airspace.