[Insight-users] Problem with Rigid3DPerspectiveTransform

[Luis Ibanez]

Hi Albert,


1) No, you cannot use the Rigid3DPerspectiveTransform along
    with the ResampleImageFilter in order to get a 2D image
    out of a 3D image.  The reason is that none of them will
    know how to combine the data of the 3D image in order to
    generate 2D pixels.

    I presume that you are doing something like projecting
    the 3D dataset in order to create a Digitally Reconstructed
    Radiograph DRR. If this is the case, you may want to look
    at the example:

                 InsightApplications/
                      IntensityBased2D3DRegistration/



2) In order to set the center of rotation, you simply invoke
    the method

              transform->SetCenterOfRotation()


    you will not see this method if you grep in the code, because
    it is implemented using the itkSetMacro, in line 161 of

               Insight/Code/Common/
                 itkRigid3DPerspectiveTransform.h

     itkSetMacro(CenterOfRotation,InputPointType);
     itkGetConstReferenceMacro(CenterOfRotation,InputPointType);


     but if you read the Doxygen documentation for this class

http://www.itk.org/Insight/Doxygen/html/d1/d5c/classitk_1_1Rigid3DPerspectiveTransform.htm


     you will find the method

          virtual void SetCenterOfRotation (InputPointType _arg)

http://www.itk.org/Insight/Doxygen/html/d1/d5c/classitk_1_1Rigid3DPerspectiveTransform.html#itk_1_1Rigid3DPerspectiveTransformz1515_0




   Regards,


      Luis


------------------------
Albert Chitemyan wrote:
> Hi,
>  
> I'm trying to use Rigid3DPerspectiveTransform to transform images and I 
> have 2 problems.
>  
> 1. Is it possible use Rigid3DPerspectiveTransform with 
> ResampleImageFilter to get transformed image (which has 2 dim.)?
>  
> 2. How can I set the center of rotation for this class? In the 
> documentation is written that it provides center of rotation, but I've 
> not seen any way to do it.
>  
> thanks
>  
> Albert
> 
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