[Insight-developers] Re: Landmark Based transform initializer

[Karthik Krishnan]

Hi,

We've added a landmark based transform initializer class. Currently it only supports Rigid3D transforms. In other words the SetTransform method 
should pass a VersorRigid3DTransform. We will try to add one for affine and corresponding rigid/affine ones for 2D, 

The solution is based on: 
   Berthold K. P. Horn (1987),
    "Closed-form solution of absolute orientation using unit quaternions,"
    Journal of the Optical Society of America A, 4:629-642
 http://people.csail.mit.edu/bkph/papers/Absolute_Orientation.pdf
and flicked from Hybrid/vtkLandmarkTransform.cxx


See Testing/Code/Common/itkLandmarkBasedTransformInitializerTest.cxx
and
Code/Common/itkLandmarkBasedTransformInitializer.txx/h

On a related note:
Other landmark based transform initializers in ITK are:
http://www.itk.org/Insight/Doxygen/html/classitk_1_1ThinPlateSplineKernelTransform.html
http://www.itk.org/Insight/Doxygen/html/classitk_1_1ThinPlateR2LogRSplineKernelTransform.html
http://www.itk.org/Insight/Doxygen/html/classitk_1_1ElasticBodyReciprocalSplineKernelTransform.html
http://www.itk.org/Insight/Doxygen/html/classitk_1_1ElasticBodySplineKernelTransform.html
http://www.itk.org/Insight/Doxygen/html/classitk_1_1VolumeSplineKernelTransform.html


Thanks
Regards
Karthik






mrcheung at mdanderson.org wrote:

>karthik:
>
>I am working on deformable registration. However a rigid landmark based
>method of initializaing registration would be helpful. If you are willing
>to add such a class, it will be very useful as least to me.
>
>Thanks, Rex
>
>
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