快速傅立叶变换算法频域滤波，效果不错，可以试试。-Fast Fourier Transform algorithm for frequency domain filtering, good results, you can try.

数字图像的综合处理，能够实现图像的平滑，锐化，增强，边缘检测与提取，几何变换和频率域变换等操作。-Digital image processing, image smoothing, sharpening, enhancement, edge detection and extraction, geometric transformations and frequency domain transform operation.