Algorithm Difference between Median_Filter And Median Inside Rank Filter?

Posted by ashishdonvir on Oct 17, 2013; 6:41am
URL: http://imagej.273.s1.nabble.com/Algorithm-Difference-between-Median-Filter-And-Median-Inside-Rank-Filter-tp5005217.html

In Median_Filter  Available as plugin filter if i select kernel size 9 it takes around 11 seconds to perform the filter for my grayscal image of size 1580x1050. On other hand if select  Median from the menu Process -> Filters -> Median and set Radius 9 it takes around 2.5 five seconds only to perform the filter for the same image. I know that Median is one of the rank filters of imageJ. What is the difference between Median in rank Filters And Median_Filter As Plugin? i Know that In Median_Filter it applies 9x9 median for each pixel. But i need     know about Median of rank filter. I tried to see code but could not understand exactly what it does. What is difference between kernel value and Radius Value? It would be great help if Any one explain the logic of Median of rank filter?