[ITK] [ITK-users] Segmentation fault when trying to generate a BSpline transform from a set of matching landmarks

[Matt McCormick]

Hi Carlos,

There have been some improvements to the
LandmarkBasedTransformInitializer recently, so could you please try
with Git master [1]?

If the issue remains, could you please share a short, self-contained,
compilable example?

Thanks,
Matt

[1] http://www.itk.org/Wiki/ITK/Git

[2] http://www.sscce.org/

On Thu, Oct 29, 2015 at 9:12 AM, Carlos Henrique Villa Pinto
<chvillap at gmail.com> wrote:
> Hi, everyone.
>
> I have two sets of landmark points, detected from two different 3D MR
> images, and I'm trying to estimate a nonlinear mapping between the pairs of
> matching landmarks. I already have the matchings, I just need to generate a
> BSpline transform from them. The LandmarkBasedTransformInitializer class
> seems perfect for that, but when I call its InitializeTransform() method
> (after setting all the required input parameters), the result is a
> segmentation fault.
>
> I'm using ITK 4.8.0. I checked the source code and made some tests, but the
> only thing that I could find out is that the problem happens in the
> GenerateData() method of the BSplineScatteredDataPointSetToImageFilter
> class, when the SingleMethodExecute() method is called by the
> ThreadGenerator object. In such version of ITK, that happens in line 314 of
> the file BSplineScatteredDataPointSetToImageFilter.hxx. I couldn't go
> further because I have no clue of what exactly is being called by the
> ThreaderCallback in that class.
>
> Does anyone have any clue about what sort of things could cause a
> segmentation fault in the BSplineScatteredDataPointSetToImageFilter class?
> Could that be a bug, maybe?
>
> I don't know if this information is relevant, but my images have both LPI
> orientation, origin = (-127.5, -127.5, -127.5) and spacing = 2 x 2 x 2 mm.
> And I'm using the SetReferenceImage() method of the
> LandmarkBasedTransformInitializer class to define the parametric domain of
> the BSpline transform.
>
> I can provide some pieces of code and more information about my data if
> needed.
>
> Thanks in advance!
>
> []s
>
> --
> Carlos Henrique Villa Pinto
> Graduate Student in Computer Science
> Federal University of São Carlos - Brazil
> XCS
>
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