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Re: 3D histogram + sensible thresholding [message #40522 is a reply to message #40515]

Fri, 13 August 2004 11:11

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Dee writes:

> Any opinions out there on what is the most sensible/intelligent way to
> set a histogram threshold for grey scale data using IDL? Does IDL have
> some kind of function that will optimize your threshold given some
> kind of norm?

I don't know of anything built into IDL, but it
would be easy to build yourself. You could easily,
for example, figure out how to do a 1 standard deviation
stretch, or something of the sort.

> Also, has anyone written a script to make histograms for 3D arrays?
> I've happily used Dave Fanning's beautiful XSTRETCH code, but it only
> works for 2D. Have you extended it to 3D perhaps, Dave?

There is nothing in the histogram part of XSTRETCH that
precludes using a 3D array. The only thing 2D about XSTRETCH
is that it assumes a 2D image array to display.

What would you be displaying in a 3D array?

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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[Message index]

		Re: 3D histogram + sensible thresholding By: dow on Sat, 14 August 2004 15:35
		Re: 3D histogram + sensible thresholding By: David Fanning on Fri, 13 August 2004 11:11
		Re: 3D histogram + sensible thresholding By: David Fanning on Mon, 16 August 2004 21:44

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