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 l

low_pass filter and median filter for remove noises