说明：  可变窗lee滤波程序，可根据像素周围复杂情况自动确定窗口大小，本程序是根据极化SAR图像编写的，也可改为普通图像
(Variable window filter lee procedures, according to the complexity of pixels around the window size automatically determined, the procedure is based on the preparation of polarization SAR images, and it can be changed to ordinary images)