用VHDL实现了Matlab中MedFilt1函数3阶中值滤波。进行排序时没有用软件使用的排序法，而是通过简单的比较实现。-VHDL implementation using the Matlab function MedFilt1 of 3-order median filter. Sort of no use when the software used to sort the Law, but through a simple comparison of implementation.