[vtkusers] can we match a cropped version of a model againt the original using the vtkIterativeClosestPointTransform?

[M.Salman at surrey.ac.uk]

Thanks Turner,
I understand what you are saying but I don't know how to code this, Can you please elaborate it a bit more ? I really appreciate your help.

Best Regards,

M.Salman 
University of Surrey,U.K.
                                                                                                     



-----Original Message-----
From: Wes Turner [mailto:wes.turner at kitware.com]
Sent: Thu 03/05/2007 4:09 PM
To: Salman M Mr (PG/R - Electronic Eng)
Cc: vtkusers at vtk.org
Subject: Re: [vtkusers] can we match a cropped version of a model againt the original using the vtkIterativeClosestPointTransform?
 
The source and target landmarks need to have the same number of points for
the point-to-point metric to work.  However, the number of points in the two
models you are registering need not (and generally won't) be the same.  The
trick is to subsample from the source and to pick the closest points on the
target as the matches.  For matching patches to their appropriate location,
you may have to find a starting position sufficiently close to the correct
position of the patch to ensure that you do not get trapped in a local
minima.

- Wes

On 5/3/07, M.Salman at surrey.ac.uk <M.Salman at surrey.ac.uk> wrote:
>
>
> Hi all,
> The cropped version of a model doesnt necessarily consists of equal number
> of points as of the original.While vtkIterativeClosestPointTransform makes
> use of  vtkLandmarkTransform internally to compute the best fit which
> further calls for equal number of points in both landmarks.
> "Call SetSourceLandmarks and SetTargetLandmarks to specify the two sets of
> landmarks, ensure they have the same number of points"
>
> Can we still use the vtkIterativeClosestPointTransform to match the
> cropped version to the original model...
> Any thoughts?
>
> Regards,
>
> M.Salman
> University of Surrey,U.K.
>
>
>
>
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-- 
Wesley D. Turner, Ph.D.
Kitware, Inc.
R&D Engineer
28 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-371-3971 x120

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