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not-quite meidan filter [message #72740]

Thu, 30 September 2010 12:38

JJ
Messages: 36
Registered: January 2007

Member

I would like to do something that is similar to, but not quite the
same as, a median filter to a 2D array. Instead of choosing the
median value in a box surrounding each pixel, I would like to chose
the value in that box that occurs most frequently.

For example, if I had

1 1 1 1 1
1 1 1 1 1
2 2 2 2 2
2 2 3 3 3
3 3 3 3 3

The median would be 2, but I would want the value 1 (it occurs 10
times, which is more than the 8 instances of the value 3 or the 7
instances of the value 2).

Can anyone think of a clever way to do this that would be fast in IDL
(ie, no looping through the pixels)? I need it to work for box sizes
up to around 21. Ties may be broken arbitrarily.

Is there already a name for this concept?

Thanks.

-Jonathan

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not-quite meidan filter

By: JJ on Thu, 30 September 2010 12:38

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