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Re: Adding a stack of array in quadrature sum [message #65630]

Sat, 14 March 2009 09:54

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

joerhee@gmail.com writes:

> I'm working on a stack of image array in which I need to calculate
> quadrature sum of each pixel. I'd like to know if there is any
> program that does it or if anybody know an efficient way to do it.

Assuming that a "quadrature sum" is the square root
of the sum of the squares, I think something like this
would work:

qsum = SQRT( Total(stack^2, 3) )

This assumes that the third dimension is the number of
images in the stack.

Cheers,

David

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

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		Re: Adding a stack of array in quadrature sum By: David Fanning on Sat, 14 March 2009 09:54
		Re: Adding a stack of array in quadrature sum By: joerhee on Fri, 24 April 2009 13:02

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