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Re: Regarding the Fit_Ellipse Program [message #58902 is a reply to message #58888]

Tue, 26 February 2008 06:46

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

plim.dreaming@gmail.com writes:

> The last time I posted here I got awesome help and I have what I
> believe is a smaller problem this time.
> I am trying to use the fit_ellipse program (http://www.dfanning.com/
> ip_tips/fit_ellipse.html) and having some difficulty in that my ROI is
> a contour defined by a 2-D array and not a 1-D array of pixels.
> My 2-D array contains the x and y positions of all the points along
> that contour (or ROI) so I am trying to translate this fit_ellipse
> program to something I can use.

Use your contour with POLYFILLV to get the indices inside
the contour. (Or, put your contour into an IDLanROI object
and use the inherit methods there to do the same, with
slightly different results.) Then, you can create the
"blob" that works with FIT_ELLIPSE. I personally feel
a bit more secure with the IDLarROI method, but I've
used both. I've convinced myself that both methods are
"accurate," whatever that means. :-)

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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[Message index]

		Re: Regarding the Fit_Ellipse Program By: David Fanning on Tue, 26 February 2008 12:44
		Re: Regarding the Fit_Ellipse Program By: plim.dreaming on Tue, 26 February 2008 08:57
		Re: Regarding the Fit_Ellipse Program By: David Fanning on Tue, 26 February 2008 06:46
		Re: Regarding the Fit_Ellipse Program By: plim.dreaming on Tue, 26 February 2008 13:38

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