[Insight-users] Re: GeometryOn

[Luis Ibanez]

Hi Andrew,

As the error message indicates,

You must call "Update()" in the calculator
before you attempt to call GetPrincipalAxes().


   Regards,


      Luis



=================
Andrew Li wrote:
> Hi, Luis:
> 
> We have some code that is similar to what is described in SW guide:
> 	...
> 	typedef itk::VersorRigid3DTransform< double  > TransformType;
> 	TransformType::Pointer transform = TransformType::New();
> 
> 	...
> 	typedef itk::CenteredVersorTransformInitializer< 
> 		DataImgType_, DataImgType_ > TransformInitializerType_;
> 	typename TransformInitializerType_::Pointer
> m_TransformInitializer;
> 	....
> 
> 
> When we change
> 	m_TransformInitializer->MomentsOn()
> to
> 	m_TransformInitializer->GeometryOn()
> 
> we got the following error messages:        
>         itk::ExceptionObject (0xa7f09088)
>         Location: "typename 
>         itk::ImageMomentsCalculator<TImage>::MatrixType
>         itk::ImageMomentsCalculator<TImage>::GetPrincipalAxes()
>         const [with TImage = SInt16Image3DType]" 
>         File: /auto/pub/andrew/mhome/src/InsightToolkit-2.6.0/
>         	  Code/Algorithms/itkImageMomentsCalculator.txx
>         Line: 300
>         Description: itk::ERROR: ImageMomentsCalculator(0xa7f5f8e8):
>         	GetPrincipalAxes() invoked, but the moments have not
> been 		computed. Call Compute() first.
> 
> (It happens both in ITK 2.4.0 and 2.6.0)
>         
> If you or someone is currently compiling and testing
> Examples/Registration/ImageRegistration8.cxx,
> please help us to make the same 1-line change and verify that there is
> indeed a problem.
> 
> Thank you very much for your help!
> 
> -Andrew
>  
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