[Insight-users] Add Zero member to NumericTraits<SymmetricSecondRankTensor>

[Karthik Krishnan]

done

Bryn Lloyd wrote:

> Hi Luis,
>
>
> I am writing a points of interest (corner) detection filter, which 
> will calculate structure tensors at each pixel location to find good 
> landmarks for methods like blockmatching etc.
> I wrote this filter using  Vector-Images (itk::Vector class), but 
> would like to change it, so it uses the itk::SymmetricSecondRankTensor 
> class.
>
> One advantage of this, is that I could later also reuse the 
> itkHessianRecursiveGaussianImageFilter, which has an itk::Image< 
> SymmetricSecondRankTensor...> as output, to find blob like features.
>
> My Problem is the following:
>
> I use the MeanImageFilter (on my SymmetricSecondRankTensor Image), 
> which in turn uses the NumericTraits::Zero member to calculate the mean.
> The Zero member doesn't exist though.
> Would it be possible to add the Zero member to the 
> itkNumericTraits<SymmetricSecondRankTensor> class?
>
> I guess a NumericTensorTraits.cxx would need to be added, with a 
> couple of lines like:
>
> const SymmetricSecondRankTensor<double , 2>  
> NumericTraits<SymmetricSecondRankTensor<double, 2> >::Zero = 
> SymmetricSecondRankTensor<double , 2>( NumericTraits<double >::Zero );
>
>
>
> That would be really nice!
>
> Thanks
>
> Bryn
>
>
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