说明：  包里就两个M文件。。avefilt是自编的均值滤波，midfilt是自编的中值滤波~~ 滤波结果除了边缘部分保留原值没有处理其他和系统自带的滤波效果是一样的
(M bag on the two documents. . avefilt is written and directed the mean filter, midfilt is written and directed the median filter ~ ~ filtering the results of some of the reservations in addition to the edge of original value and the system does not address the other built-in filtering effect is the same)