[Insight-users] How to /merge/ separate images into a tensor image?

[Jeff Donner]

Hi,

  I'd like to use the HessianRecursiveGaussianImageFilter to get the
Hessian of pixels of an image, then to diffuse their value a bit,
element-by-element (making a structure tensor). The Hessian.. 's
output type is a SymmetricSecondRankTensor, which, you can use
Adaptors to feed the 9 components to a Gaussian blurring function,
each of which will write the result to a separate image. However, then
I'd like to get it back into Symmetric...Tensor form for the
consumption of the SymmetricEigenAnalysisImageFilter. Is there a
built-in ITK way to 'merge' separate images into a many-component one,
the way Adaptor does, the other way?

Thanks,
Jeff Donner