[vtkusers] Question reg. vtkLandmarkTransform

[David Gobbi]

Hi Hendrik,

You assume correctly, the VTK_LANDMARK_AFFINE includes shear,
it performs 12 degree-of-freedom linear registration.  There is no mode for
vtkLandmarkTransform to use different scaling along the x, y, and z axes. 

 - David

Hendrik Belitz wrote:

>Deae members of the VTK community,
>
>currently I'm trying to align two point clouds using vtkLandmarkTransform. 
>This works very good, despite two things:
>1.) There is no documentation for VTK_LANDMARK_AFFINE, so I have no clue what 
>this is doing. I assume that shearing is included in the transformation, but 
>I'm not sure about it. Does anybody of you know something about this?
>2.) The isotropic scaling done by vtkLandmarkTransform in all cases gives me 
>some bad results for distinct point clouds. Using anisotropic scaling could 
>solve the problem. Is there any way to do this in VTK?
>
>Regards
> Hendrik
> 
>-------------------------------------------------------------------------------------
>Dipl.-Inform. Hendrik Belitz
>Central Institute of Electronics / Zentralinstitut für Elektronik 
> Multimodal image processing workgroup / AG Multimodale Bildverarbeitung
>Research Center Juelich / Forschungszentrum Jülich GmbH
>D-52428 Jülich, Germany
>Tel.: (++49)2461 61 8701 Fax: (++49)2461 61 3990
>email: h.belitz at fz-juelich.de
>ggp-key available via http://pgpkeys.pca.dfn.de
>  
>
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