[Insight-users] ~vnl_svd() {} misterious runtime error

[Luis Ibanez]

Hi  Osc,

I'll go in a minute to your second email
(where you posted the debugging information)


but, just to answer your question:

The reason why the ITK image inverts that matrix
is to make possible a rapid computation of

             PhysicalPointToIndex    and
             IndexToPhysicalPoint

These are computations that are usually applied to many
pixels, and therefore it is convenient to cache the two
Matrices that perform the transformation
(one matrix being the inverse of the other).

A change in the image spacing requires a recomputation
of these two matrices.


   Regards,


      Luis


----------------------------------------------------------------------------
On Fri, Apr 9, 2010 at 8:09 PM, Osc at r Math <olguna at cimat.mx> wrote:

>  Hi All…!!!
>
>
>
> Recently I took back an ITK-VTK-BCB5 project, but as I know ITK & VTK
> improves, I decided to update those toolkits (by the way, congrats!!! For
> this big effort).
>
> Actually, compiled ITK 3.16 & VTK 5.4.2 Releases
>
> BCB 5 with Borland C++ compiler 5.5.
>
>
>
> Today I  get a runtime error that it’s pretty mysterious (at least for me)…
>
>
>
> The application reads a 3D image by VTK reader, show it by VTK
> renderization, send it to ITK pipeline, calculates partial derivatives &
> magnitude gradient, then save Dx, Dy, Dz & |V|.
>
>
>
> The image has a spacing, an origin, among others…
>
> When spacing is 1.0, 1.0, 1.0 there’s no problem, everything works fine,
>
> but if spacing changes anyone of those dimensions, application crashes.
>
>
>
> The application is capable to read image, show it, but when tries to
> connect VTKReader to ITKCaster (is first action with ITK) send an “Abnormal
> Program Termination”
>
>
>
> In Debug mode I realize that crashes trying to execute
>
> ~vnl_svd() {}
>
> In vnl_svd.h file and mark an error like:
>
> … Access violation at address XXXX …
>
> If continue debugging, crashes too in:
>
> ~vnl_diag_matrix() {}
>
> In vnl_diag_matrix.h file with similar error
>
> And finally throws an “Abnormal Program Termination”…
>
>
>
> I didn´t know why tries to invert a matrix that contains
>
> xSpacing     0                      0
>
>        0      ySpacing              0
>
>       0             0               zSpacing
>
>
>
> ¡¡¡ Someone could help me !!!
>
>
>
> TNX in advance
>
>
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