[Insight-developers] GaussianFilter::NormalizeAcrossScale not good for scale space analysis

[Ivan Macia]

Hi Brad,

Excellent work. My only concern is that you have removed the analytical
computation of coefficients completely. From my experiments (I cannot
confirm this, it was long ago but something can be seen in the IJ paper in
the graphics at the end
http://www.insight-journal.org/browse/publication/179) it seemed that the
analytical approach had more precision specially for larger derivative
orders. What was the ultimate reason to remove them? The normalization not
working? Do you think we could fix the normalization of the analytical
coefficients the same way as with the Derivative operator?

Tell me if you need any further help with this.

Thanks in advance

Iván

El 3 de enero de 2011 22:53, Bradley Lowekamp <blowekamp at mail.nih.gov>escribió:

> Hello all,
>
> I have completed a major revision to itkGaussianDerivativeOperator and
> submitted a couple of patches to gerrit:
>
> http://review.source.kitware.com/#change,660
> http://review.source.kitware.com/#change,661
>
> This patch is a needed algorithmic revision to produce accurate results.
>
> I still need to modify my recursive gaussian scale space test to test the
> discrete functions. But without that,  I am still extremely confident in the
> the results form this operator are correct and robust with it's parameters
> as it's values are extremely close to the values I am getting with the
> recursive hessian filter for my scale space program.
>
> 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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