[Insight-developers] Using ConstantPadImageFilter on vector images

[Lydia Ng]

Hi All,

I would like to use ConstantPadImageFilter
on vector images (i.e. where the image pixel is
of type itk::Vector<someScalar,vectorDimension>).

The existing implementation does not work because as
it requires the used of NumericsTraits<PixelType>::Zero
to initialize the padding value to "zero".
Currently, NumericsTraits for itk::Vector's are not defined.

I am not sure how to go about defining a generic
NumericsTraits for Vector. Does one have to explicitly
specialize NumericsTraits for every combination
of *someScalar* and *vectorDimension*?

My other option is to create a vector version
of the filter (i.e. a VectorConstantPadImageFilter) but
that seems to be an awful lot of code duplication.

Any suggestions?

Cheers,
Lydia