[ITK] [ITK-users] extracting each component of the GradientRecursiveGaussianImageFilter

[Pol Monsó Purtí]

Hello all,

The declaration of thefilter is

template<typename TInputImage, typename TOutputImage = Image<
CovariantVector< typename NumericTraits< typename TInputImage::PixelType
>::RealType, TInputImage::ImageDimension >, TInputImage::ImageDimension >>

In my case, ImageDimension = 3

So I have two questions.

Question number 1:
Does the output image hold, for each pixel, the three derivatives? Can they
be accessed by

it.Get()[0] it.Get()[1] it.Get()[2]

where it is itk::ImageRegionIterator< GradientImageType > it(
gradientImage,
gradientImage->GetRequestedRegion() );

?

Question number 2: (just for curiosity)
what happens when TOutputImage = Image< PixelType, Dimension> ?
and what happens when you create a writer with the default TOutputImage and
write to disk? Do the derivatives end in different channels or a magnitude
is computed?
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