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Delaunay triangulation search [message #56147]

Fri, 05 October 2007 15:17

Charudatta Phatak
Messages: 6
Registered: November 2006

Junior Member

Hello All,

I want to know, is there a function in IDL which will give me the
corresponding indices of a traingle from a delaunay triangulation for
the given point. So suppose i use TRIANGULATE to generate a
triangulation. Then i want to go through the image pixel by pixel and
want to determine which pixels are enclosed in a particular triangle.

In MATLAB, the function tsearch does this. This is the help of tsearch
from matlab website:

tsearch
Search for enclosing Delaunay triangle
Syntax
T = tsearch(x,y,TRI,xi,yi)
Description
T = tsearch(x,y,TRI,xi,yi) returns an index into the rows of TRI for
each point in xi, yi. The tsearch command returns NaN for all points
outside the convex hull. Requires a triangulation TRI of the points x,y
obtained from delaunay.

I think a function like QHULL in IDL might be able to do the same thing
but i'm unable to figure how to use it.
Thank you...

cheers,
-cd

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[Message index]

		Delaunay triangulation search By: Charudatta Phatak on Fri, 05 October 2007 15:17
		Re: Delaunay triangulation search By: ben.bighair on Mon, 08 October 2007 18:48
		Re: Delaunay triangulation search By: Charudatta Phatak on Thu, 11 October 2007 09:22

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