在标准中值滤波的基础上，当处理每一个象素时，判断该象素是否是滤波窗口所覆盖下邻域象素的极大或者极小值。如果是，则采用正常的中值滤波处理该象素；如果不是，则不予处理。-On the basis of the standard median filter, whether the pixel is large or very small values of the filter window which is covered under the neighborhood pixel. If yes,