[Insight-users] Initial parameters for itkThinPlateSplineKernelTransform

[Luis Ibanez]

Hi Vincent,

This seems to be a bug,
please enter it in the bugTracker.

         http://www.itk.org/Bug/

The problem is that the array of parameters is only being
updated when GetParameteres() is invokend. The solution is
to initialize this array as soon as the Source/Target
landmarks are provided.

Please let us know if you find any problem entering this
bug in the database.


    Thanks



        Luis



------------------------
Vincent Chu wrote:
> Hi,
> 
> I am trying to use itkThinPlateSplineKernelTransform as the transform
> class in the registration framework, i.e.
> registration->SetTransform(tps3D); where tps3D is of type
> itk::ThinPlateSplineKernelTransform<double, 3>.	I have initialized the
> tps3D with 11 landmarks.
> 
> I have previously read that tps3D would expect 3*N parameters, where N is
> 11 in this case (http://public.kitware.com/pipermail/insight-users/2002-June/000544.html
> ).  However, after setting the landmarks, tps3D->GetNumberOfParameters()
> would return 3 (instead of 33).	I know the landmarks have been set
> correctly because I can apply the transformation with the help of
> resampleFilter.
> I am wondering what the 3 parameters should be.  To put it in context,
> this is what I want to do:
> 
> 	ParametersType initialParameters( tps3D->GetNumberOfParameters());
> 	initialParameters[0]=??;
> 	initialParameters[1]=??;
> 	initialParameters[2]=??;
> 	registration->SetInitialTransformParameters( initialParameters );
> 	....
> 	registration->StartRegistration();
> 
> Thanks,
> 
> Vincent
> 
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