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Re: Finding the median of a set of images [message #6142 is a reply to message #6136]

Thu, 18 April 1996 00:00

David Foster
Messages: 341
Registered: January 1996

Senior Member

Dyer Lytle <dlytle@as.arizona.edu> wrote:
>
> Hello all,
>
> Does anyone have an algorithm for finding the median at each pixel
> position for a set of equal size 2-D images? Currently the only way
> I have to do this is to extract all the values for a given pixel
> position into a 1-D array and find the median on that.

This sounds like a good candidate for using CALL_EXTERNAL to
call a routine coded in C or Fortran! If someone can think
of an array-based way to do this in IDL I would be very
impressed.

If you are unfamiliar with using CALL_EXTERNAL zap me an
email and I'll send you some sample code using C routines.
The manual also has some examples, in the Advanced Development
Guide (RSI will send you one [free!] by request only).

Sorry this isn't what you wanted to hear.

Dave Foster
UCSD Brain Image Analysis Lab
foster@bial1.ucsd.edu

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[Message index]

		Re: Finding the median of a set of images By: Dyer Lytle on Wed, 24 April 1996 00:00
		Re: Finding the median of a set of images By: peter on Fri, 19 April 1996 00:00
		Re: Finding the median of a set of images By: Joseph M Zawodny on Fri, 19 April 1996 00:00
		Re: Finding the median of a set of images By: steinhh on Fri, 19 April 1996 00:00
		Re: Finding the median of a set of images By: David Foster on Thu, 18 April 1996 00:00

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