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Rapid "moving windows" access in IDL? [message #37847]

Thu, 29 January 2004 17:43

Jonathan Greenberg
Messages: 91
Registered: November 2002

Member

I'm trying to code a semivariance measure to analyze an image in IDL. Since
the call requires extracting data from a matrix a certain distance away from
the center pixel, is there a fast way of coding IDL to extract these
locations, or is am I doomed to have a very slow algorithm. Basic gist:

For a given pixel/matrix location, subtract off the value of the pixels
surrounding that pixel:

For pixel at A is at x,y
B at x-1,y
C at x+1,y

Semivariance = ((A-B)^2 + (A-C)^2)/4

Any suggestions?

--j

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