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Re: Cutting/Exclude ROI's based on overlapping [message #52309 is a reply to message #52302]

Sat, 27 January 2007 15:51

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Erik writes:

> I have some problems with a ROI based program. I want to cut/exclude
> some parts of the ROI's when the ROI is overlapped by another ROI in
> the same draw widget.
>
> As you will know the ROI Data is built like this [ <number of
> dimensions>, <corresponding coordinate> ]. I use the IDLgrROI object to
> draw and manage my ROI's.
>
> Is there any method to cut/exclude some parts of a ROI based on
> coordinates or other ROI's in a easy way? All info about excluding
> areas in ROI's will be appreciated!!

This is not a totally trivial problem, but it is well-known.
I don't know of any publicly available IDL solutions. But
a quick Google search of "intersecting polygons" will give
you lots of ideas. Note that you can find the convex hull
of a polygon with the TRIANGULATE procedure:

http://www.dfanning.com/tips/convex_hull.html

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: Cutting/Exclude ROI's based on overlapping By: btt on Sun, 28 January 2007 16:52
		Re: Cutting/Exclude ROI's based on overlapping By: David Fanning on Sat, 27 January 2007 15:51
		Re: Cutting/Exclude ROI's based on overlapping By: Erik[1] on Tue, 30 January 2007 00:07
		Re: Cutting/Exclude ROI's based on overlapping By: Erik[1] on Thu, 01 February 2007 05:10

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