中文说明：中值滤波是有助于减少冲动，或椒盐噪声的非线性过程。它也是有用的在保留图像中的边缘。此筛选器给出了较好的效果，对其他中位数比较筛选器
English Description：
Median filtering is a nonlinear process useful in reducing impulsive, or salt-and-pepper noise. It is also useful in preserving edges in an image.This Filter gives better result compared to other median Filters