[Insight-users] Problem with vtk-transform to itk-transform

[Luis Ibanez]

Hi Carola,

Please look at the example:

      InsightApplications/Auxiliary/vtk/
                   vtkRegistrationMonitor.cxx

In particular, to lines 230-245.

They illustrate how to get the values of an ITK matrix and
put them as element of a vtkMatrix4x4.

This example is used to visualize the progress of an ongoing
image registration.


    Regards,


        Luis


=====================
Carola Schmidt wrote:
> Hi, itk users,
> 
> I want to generate a mean atlas and therefore I have calculated an 
> icptransformation in vtk between two images. From that calculation I can 
> get a vtkMatrix4x4 by vtkMatrix4x4 * matrix = icpTransform->GetMatrix();.
> 
> Now I want to overlay both images as itk images. So I want to use the 
> calculated vtkMatrix4x4 on one itk image. For that I use a resampler:
> 
>    typedef itk::ResampleImageFilter<ImageType,ImageType > 
> ResampleFilterType;
>    ResampleFilterType::Pointer resampler = ResampleFilterType::New();
>    resampler->SetInput( image );
>    resampler->SetTransform(transform);
>    ....
> 
> My problem is now to give my vtkMatrix4x4 to an adequate transformation. 
> For example, I have tried to use Rigid3DTransform but by setMatrix(...) 
> I can only commit a 3x3 Matrix.
> Does someone know a solution for this problem? Is there an adequate 
> transform which takes a 4x4matrix? Or is there a simple way to read a 
> rotation matrix and a translation vector out of my 4x4matrix? Perhaps 
> there are other ways to convert a vtktransform to an itktransform?
> 
> Thank you for an answer.
> 
> Ciao,
> Caro
> 
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