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Re: Fast way to collapse data cube with median [message #85135 is a reply to message #85133]

Tue, 09 July 2013 09:22

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Stefan writes:

> I am doing a lot of image processing and very often I have a data cube
like with the x/y axes corresponding to image coordinates and the z
component corresponding to the individual images.
>
> I simply want to calculate the median at each pixel stack and so far I always loop through all pixels and determine the median for each stack. This, of course, can be quite slow for large images since it involves two loops and I was wondering if someone here might have a fancy idea of how to collapse such a cube faster.

medianValuesOfArray = Median(cube, DIMENSION=3)

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")

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[Message index]

		Fast way to collapse data cube with median By: stefan.meingast on Tue, 09 July 2013 09:08
		Re: Fast way to collapse data cube with median By: David Fanning on Tue, 09 July 2013 09:22
		Re: Fast way to collapse data cube with median By: Michael Galloy on Tue, 09 July 2013 09:28
		Re: Fast way to collapse data cube with median By: stefan.meingast on Tue, 09 July 2013 10:42
		Re: Fast way to collapse data cube with median By: David Fanning on Tue, 09 July 2013 10:44
		Re: Fast way to collapse data cube with median By: stefan.meingast on Tue, 09 July 2013 12:14

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