[ITK] [ITK-dev] BSplineTransform TransformPoint() crash

[Bradley Lowekamp]

Hello,

Thank you for reporting this issue and providing a clear example and proposed solution.

In looking at the problematic function[1], I a quite surprised to see that the the signature of the method:
   bool BSplineTransform::InsideValidRegion( ContinuousIndexType & index ) const

Specifically, the argument is not constant and it is being modified by this problematic case.

I am suspicion of the need for this if statement in the method. It appears there may be a deeper issue with how the b-spline is defined over the upper range of the last index. The transform should be valid from (minIdx-0.5, maxIdx+0.5). I am going to also note that this case is not in itkBSPlineDeformableTransform.

Brad

[1] https://github.com/InsightSoftwareConsortium/ITK/blob/master/Modules/Core/Transform/include/itkBSplineTransform.hxx#L465-L495



> On Apr 20, 2016, at 7:07 AM, Denis Shamonin <dshamoni at gmail.com> wrote:
> 
> Dear Developers,
> 
> We have found the rare but reproducible crash during the resampling in combination with BSplineTransform. Could you please review this issue on JIRA? More details here:
> https://issues.itk.org/jira/browse/ITK-3425 <https://issues.itk.org/jira/browse/ITK-3425>
> Thanks,
> 
> Denis P. Shamonin, MSc
> Division of Image Processing (LKEB)
> Department of Radiology
> Leiden University Medical Center
> 
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