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Median Image Filter. David Newman Nick Govier. Overview. Purpose of Filter Implementation Demo Questions ??. Purpose. Removes “ Salt & Pepper ” Noise Will not remove Gaussian Noise Use Gaussian Smoothing Side Effects Detail is lost Border pixels are lost. Implementation (1).

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## Median Image Filter

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**Median Image Filter**David Newman Nick Govier**Overview**• Purpose of Filter • Implementation • Demo • Questions ??**Purpose**• Removes “Salt & Pepper” Noise • Will not remove Gaussian Noise • Use Gaussian Smoothing • Side Effects • Detail is lost • Border pixels are lost**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.**N.B. Each template takes**the values its sorts from the original image 101 69 0 56 255 87 123 96 157 0 56 69 87 96 101 123 157 255 Implementation (2)**Demo**• Implemented as a Java Applet • Can be viewed at “www.ecs.soton.ac.uk/~drn101/MedianFilter.html”

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