[vtkusers] fitting curve to points

[Dean Inglis]

Hi Goodwin,

thanks for the suggestion, but the trick will be to
deal with the spatial ordering of the points otherwise
fitting to the points as is gives a zig-zag pattern
and not a loop.  I'm thinking of starting with a
perfectly circular loop having the same number of points
and then transforming (somehow???) them to the target(?)
centerpath points: maybe vtkLandmarkTransform ?

Dean

-----Original Message-----
From: Goodwin Lawlor [mailto:goodwin.lawlor at ucd.ie]
Sent: Wednesday, June 18, 2003 2:22 PM
To: dean.inglis at on.aibn.com; vtkusers at public.kitware.com
Subject: Re: [vtkusers] fitting curve to points


Have a look at:

/Filtering/Testing/Tcl/closedSplines.tcl

or here on the web:
http://public.kitware.com/cgi-bin/cvsweb.cgi/VTK/Filtering/Testing/Tcl/close
dSplines.tcl?rev=1.3&content-type=text/x-cvsweb-markup

HTH

Goodwin
----- Original Message -----
From: <dean.inglis at on.aibn.com>
To: <vtkusers at public.kitware.com>
Sent: Saturday, June 14, 2003 5:53 PM
Subject: [vtkusers] fitting curve to points


> I have extracted the center path from a binarized image of
> the cross section of a leg bone using
>
>                              -> vtkImageGradient  \
> vtkImageEuclideanDistance ->|                      |->
vtkImageNonMaximumSuppression
>                              -> vtkImageMagnitude /
>
>
> then extracted the points with
>
> vtkImageNonMaximumSuppression -> vtkThresholdPoints
>
> I would like to fit a closed polyline to the points,
> but the points from vtkThresholdPoints are not in a
> spatially sequential order.  Any ideas how to do this?
>
> Dean
>
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