1. Median Image Filter David Newman Nick Govier

2. Overview Purpose of Filter Implementation Demo Questions ??

3. Purpose Removes “ Salt & Pepper ” Noise Will not remove Gaussian Noise –Use Gaussian Smoothing Side Effects –Detail is lost –Border pixels are lost

4. Implementation (1) Use a Template –Of size 3x3, 5x5, 7x7, … etc. Sort the values in the template –We used merge sort Middle value of sorted list replaces the template ’ s central pixel.

5. Implementation (2) 101690 56255 123 87 96157 101690561232558796157 N.B. Each template takes the values its sorts from the original image

6. Demo Implemented as a Java Applet Can be viewed at “ www.ecs.soton.ac.uk/~drn101/ MedianFilter.html ”

7. Questions ??