频域滤波：要进行频域的图像增强，滤波是非常重要的，常用平滑、锐化和同态三种滤波器-Frequency-domain filtering: To carry out frequency domain, image enhancement, filtering is very important, often smooth, sharpen, and three kinds of filters with the state of

具有实现三态复选框控件功能的所有截图 代码，可以使界面更美好-Three-state check box control functions of all the screenshots code can make a better interface