[Insight-users] Gaussian filtering of tensor image

[Luis Ibanez]

Hi Won,

You need to create a NumericTraits file for the
DiffustionTensorPixel type and define for it
the "RealType".

For examples on how to define NumericTraits for
particular types please look at the file in

     Insight/Code/Common

itkNumericTraits.cxx
itkNumericTraits.h
itkNumericTraitsCovariantVectorPixel.cxx
itkNumericTraitsCovariantVectorPixel.h
itkNumericTraitsRGBPixel.cxx
itkNumericTraitsRGBPixel.h
itkNumericTraitsTensorPixel.cxx
itkNumericTraitsTensorPixel.h
itkNumericTraitsVariableLengthVectorPixel.cxx
itkNumericTraitsVariableLengthVectorPixel.h
itkNumericTraitsVectorPixel.cxx
itkNumericTraitsVectorPixel.h


Note that if you do, the gaussian filtering will be
applied *independently* to each one of the Tensor
components and therefore you may lose some of the
Tensor properties during the smoothing process.


   Regards,


      Luis


--------------------
Won-Ki Jeong wrote:
> Hi.. I am trying to apply a Gaussian filter on tensor volumes. I
> defined the image type and filter as follows:
> 
> typedef itk::Image<DiffusionTensorPixelType, 3> TensorImageType;
> typedef itk::DiscreteGaussianImageFilter<TensorImageType,
> TensorImageType> GaussTensorFilterType;
> 
> For some reasons, this won't compile. The errors are something like,
> 
> c:\work\proj\insighttoolkit-2.8.1\code\common\itkNeighborhoodOperator.h(136) 
> 
> : error C2039: 'RealType' : is not a member of 'itk::NumericTraits<T>'
> 
> and much more.
> 
> Does anyone know what causes this error? Thanks
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