The answer is no: See the following rearrangements of numbers from 1 to 81. In the left case the 3x3 median of 3x3 medians will be. ... <看更多>

Here is two function for an average filter and a median filter : mav <- function(x,n=5){filter(x,rep(1/n,n), sides=2)} #Average mmed <- function(x ... ... <看更多>

Median filter algorithm. Place a window over element;; Pick up elements;; Order elements;; Take the middle element. ... <看更多>