[Insight-developers] Derivatives of Recursive Gaussian dx scaling?

[Hans Johnson]

Brad,

I would think that now is the time to do the consolidation.  Your argument
seems correct to me.

Hans



On 12/27/10 9:43 AM, "Bradley Lowekamp" <blowekamp at mail.nih.gov> wrote:

> Hello,
> 
> So I have been taking a very close look into the Derivative calculations of
> RecursiveGaussianImageFilter ( and related Laplacian, gradient, and Hessain )
> along with GaussianDerivativeOperator (also related functions ). Why doesn't
> RecursiveGaussianImageFilter divide by spacing^order internally. Currently,
> the recursive Laplacian, Gradient and Hessian filters divide by it internally.
> The reason why I am asking is because currently the GaussianDerivativeOperator
> and related functions are missing this scaling factor. I am not sure if it
> should go into the Operator on in the functions, so I wanted to ask why this
> similar filter was implemented the way it was to assist with this design
> decision.
> 
> 
> Also what is the future of the GaussianDerivativeOperator? Normally is would
> just be a matter of moving from review into Common/BasicFitlers, However with
> the ITKv4 it may make since to do a little consolidation as well. The
> GaussianDerivativeOperator and the GaussianOperator contain a good bit of
> redundant code, so the GaussianDerivativeOperator could replace the later with
> a different set of defaults.
> 
> Thanks,
> Brad
> 
> 
> 
> ========================================================
> 
> Bradley Lowekamp 
> 
> Lockheed Martin Contractor for
> 
> Office of High Performance Computing and Communications
> 
> National Library of Medicine
> 
> blowekamp at mail.nih.gov
> 
> 
> 
> 
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