[ITK] [ITK-users] convert affine transform to scale versor 3D transform

[Dženan Zukić]

Hi Emily,

the docs
<http://www.itk.org/Doxygen/html/classitk_1_1ScaleVersor3DTransform.html#a40d48115daec95ffa2bb52f273d2a1c3>
say that matrix set via SetMatrix is not checked for orthogonality. This is
probably the reason that you get runtime errors later.

To see how affine is properly transformed into scale versor, you might want
to take a look at BRAINSFit's code
<https://github.com/BRAINSia/BRAINSTools/blob/master/BRAINSCommonLib/BRAINSFitHelperTemplate.hxx>
to see how it is done there. The answer might not be in that file, but I
remember BRAINSFit had a conversion routine.

Regards,
Dženan

On Fri, Mar 25, 2016 at 3:26 PM, Hammond, Emily M <emily-hammond at uiowa.edu>
wrote:

> Hello,
>
>
> I am trying to read in an affine transform from a file and convert it to a
> scale versor 3D transform. To do this I wish to manually define the matrix
> in the versor transform and then manually define the translation. Thus far,
> I have run into some difficulties in manually setting the matrix. As far as
> I can tell it is as basic as this one line of code.
>
>
> affineTransform is of itk::AffineTransform< double >
>
> versorTransform is of itk::ScaleVersor3DTransform< double >
>
>
> versorTransform->SetMatrix( affineTransform->GetMatrix() );
>
>
> However, I am getting some runtime errors and I cannot figure out why.
> Both my versor transform and my affine transform are defined so I am not
> trying to access something that does not exist. Can anyone give me some
> insight as to why this member function may not work or if there is a better
> way to go about converting from affine to versor based transform?
>
>
> Thanks!
> Emily Hammond
>
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