[Insight-users] Re: Rotation origin

[Luis Ibanez]

Hi George,

The center of rotation does not make part of the
parameters in the VersorRigid3DTransform.

You *MUST* pass the center of rotation explicitly
to the VersorRigid3DTransform that you use in the
resampling filter.


  You can simply do


   resamplingTransform->SetCenter(
             registrationTransform->GetCenter() );


A quick look at the source code of the class


    Insight/Code/Common/
            itkVersorRigid3DTransform.txx


will show you how the parameters are used in this
transform.  Look at lines 146-162 and lines 88-130.



   Regards,


      Luis



-----------------------------
Li, George (NIH/NCI) wrote:

> Hi, Luis and ITK users and developers:
> 
> I want to want to verify one thing about rotation origin.
> 
> I am doing the registration with Mattes metric and the
> VersorRigid3DTransform with CenteredTransformInitializer.
> Prior to registration, initializer->GeometryOn() is called.
> After the registration, can the ResampleImageFilter that
> take the final registration transformation parameters get
> the same rotational origin as the geometric center of the
> image volume, as did in the registration optimizer? 
> 
> If not, is there a way to initialize ResampleImageFilter 
> with the same origin? 
> 
> Thanks in advance for any confirmation or suggestions.
> 
> George
> 
> 
>