[Insight-users] Heads up on HessianRecursiveGaussian bug fix

[Sergio Vera]

Forgive me, but does this:

*>and it has been backported today to the 3.18 branch by Luis*

means that  fresh downloads of the ITK 3.18 have this bug corrected? As I've
redownloaded it and the modification date for this files are old...

Thanks

On Wed, Apr 28, 2010 at 8:54 PM, Luca Antiga <luca.antiga at gmail.com> wrote:

> Hi Rahul,
>  the fixed itkHessianRecursiveGaussianImageFilter is in the ITK CVS
> repository (Insight/Code/BasicFilters) and it has been backported today to
> the 3.18 branch by Luis. The test is in Insight/Testing/Code/BasicFilters.
> To test your program you'll have to checkout ITK from there and build it,
> and then compile your program against it.
>
> As a cheap alternative for testing purposes, you can download the
> incriminated file (
> http://public.kitware.com/cgi-bin/viewcvs.cgi/Code/BasicFilters/itkHessianRecursiveGaussianImageFilter.txx?revision=1.10&root=Insight&view=markup)<http://public.kitware.com/cgi-bin/viewcvs.cgi/Code/BasicFilters/itkHessianRecursiveGaussianImageFilter.txx?revision=1.10&root=Insight&view=markup%29>,
> put it in your own source tree at Insight/Code/BasicFilters (i.e. replacing
> your own version of the file) and compile your program.
>
> Hope this helps
>
>
> Luca
>
>
>
> On Apr 28, 2010, at 12:09 PM, Rahul P.Kumar wrote:
>
> Hi Luca,
>
> May I know where I can find the newly
> fixed itkHessianRecursiveGaussianImageFilter
> and tkHessianRecursiveGaussianImageFilterScaleSpaceTest for testing my
> program?
>
> Regards,
> Rahul
>
> ------------------------------
> *From:* Luca Antiga <luca.antiga at gmail.com>
> *To:* itk Users <insight-users at itk.org>
> *Sent:* Wed, April 28, 2010 3:25:41 PM
> *Subject:* [Insight-users] Heads up on HessianRecursiveGaussian bug fix
>
> Hi all,
>  this is a heads up message on a bug that Oleksandr Dzyubak has found in
> itkHessianRecursiveGaussianImageFilter
> (bug 0008990 in Mantis, http://public.kitware.com/Bug/view.php?id=10599)<http://public.kitware.com/Bug/view.php?id=10599%29>
>  and for which I recently submitted a fix.
>
> The bug affected the behavior of the filter when NormalizeAcrossScale is
> set to true with dimensions > 2, and it has effects on multi-scale
> vesselness filters or multi-scale shape-detection filters in general (e.g.
> those using itk::MultiScaleHessianBasedMeasureImageFilter), and
> vessel-enhancing diffusion filters.
>
> The bug caused incorrect normalization of the Hessian across scale-space,
> and, for instance, lead to a poor performance of vesselness filters when
> spanning several scales (vessels at smaller scales were washed out compared
> to how they appear after the fix).
>
> The fix has been committed after 3.18 was released, hence it will be in for
> ITK > 3.18. There is now a test
> (itkHessianRecursiveGaussianImageFilterScaleSpaceTest) that tests the
> scale-space behavior of the class quantitatively.
>
> So, for whoever was using multi-scale Hessian-based filters in 3D and
> higher, please rerun your tests, since there's a very good chance (100% ?)
> that the results will have changed (most likely for the better).
>
> I'm here for any clarification. Again, kudos to Oleksandr Dzyubak who
> highlighted the misbehavior through lots of testing.
>
> Best regards
>
>
> Luca
>
>
>
> --
> Luca Antiga, PhD
> Principal Scientist, OROBIX Srl
> via L.A. Muratori 3, 24123 Bergamo, Italy
>
> web: www.orobix.com
> mobile: +39.347.43.16.596
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-- 
Sergio Vera

Alma IT Systems
C/ Vilana, 4B, 4º 1ª
08022 Barcelona
T. (+34) 932 380 592
www.alma3d.com
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