[Insight-users] some questions with the ThinPlateSplineWarp.cxx

[Luis Ibanez]

Hi Feng,

Thanks for your comments regarding this example.


Please note that ITK provides multiple implementations
of KernelTransforms, all of them deriving from the class:
http://www.itk.org/Insight/Doxygen/html/classitk_1_1KernelTransform.html

It seems that you are interested in using the class:
http://www.itk.org/Insight/Doxygen/html/classitk_1_1ThinPlateR2LogRSplineKernelTransform.html

instead of the transform class:
http://www.itk.org/Insight/Doxygen/html/classitk_1_1ThinPlateSplineKernelTransform.html

that is featured in that example.



You can therefore, simply change the #include of the header file,
and the class name in the typedef statement that instantiates the
type of the transform.


Please let us know if you have any further questions.


    Thanks


        Luis



---------------------
feng yang wrote:
> hi,Luis,
>  
> I am trying to get the deformation field from a Landmark file using the 
> ThinPlateSpline transform.But I discover a problem,: in the 
> itkThinPlateSplineKernelTransform.txx, the G Matrix is gotten as 
> :"GMatrix[i][i] = r". This is true for the 3D image,but for the 2D image 
> ,the G matrix should be:GMatrix[i][i]=r^2*log(r^2),which I got from the 
> paper:"Thin-Plate Spline Approximation for image registration".However, 
> G matrix is gotten as :"GMatrix[i][i] = r" for all the dimenson image. 
> So the itkThinPlateSplineKernelTransform is just useful for 3D image? Am 
> I right ｏｒ　Ｉ　ｈａｖｅ　ｍａｄｅ　ｓｏｍｅ　ｍｉｓｕｎｄｅｒｓｔａｎｄ？
>  
> Ｔｈａｎｋ　ｙｏｕ　ｖｅｒｙ　ｍｕｃｈ！
>  
> ｆｅｎｇ