基于噪声检测的中值滤波，先通过邻域计算检测是否为噪声，再进行开关中值滤波，对于被判断为噪声的像素不再参与其他像素的中值滤波，能够有效滤除噪声并且保留细节较好-Noise Detection Based on median filtering, first calculated by testing whether the neighborhood noise, then the switching median filter for noise pixels are judged to no longer participate in other pixel median filter can effectively filter noise and keep the details well