[Insight-users] Heads up on HessianRecursiveGaussian bug fix

[Rahul P.Kumar]

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) 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
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