[Insight-users] itkImageToVTKImageFilter not updating entirely

[Luis Ibanez]

Hi Charlotte,

Thanks for the report.

This actually looks like a bug.

Could you please clarify how you are looking at the Min / Max
values of the resulting vtkImageData  ?


Also, could you please create a bug report at:
http://public.kitware.com/Bug/my_view_page.php


Providing a minimal example that illustrates
the incorrect behavior will be ideal.


    Thanks


         Luis


----------------------------------------------------------------------------------------
On Thu, Jun 25, 2009 at 12:35 PM, Charlotte Curtis <c.f.curtis at gmail.com>wrote:

> There seems to be a bit of an issue with itkImageToVTKImageFilter: the
> image information isn't entirely being updated when "Update" is called
> downstream.  The image data itself does get updated, but (for example)
> the min/max intensity values do not.  The odd thing is, it will update
> the third time (I'm running my pipeline from a GUI and if I click the
> "run" button 3 times, the image finally displays properly).
>
> This behaviour seems to have been reported several years ago
> (http://www.itk.org/pipermail/insight-users/2003-March/003110.html),
> but it doesn't look to have been resolved.  I took a look at the
> source code for the filter, and it seems that the "Update" method just
> calls Update on the importer component.  If I copy and paste exactly
> the code from the filter, as follows:
>
> vtkImageImport *importer = vtkImageImport::New();
> itk::VTKImageExport< ImageType2D >::Pointer exporter =
> itk::VTKImageExport< ImageType2D >::New();
>
>
> importer->SetUpdateInformationCallback(exporter->GetUpdateInformationCallback());
>
> importer->SetPipelineModifiedCallback(exporter->GetPipelineModifiedCallback());
> importer->SetWholeExtentCallback(exporter->GetWholeExtentCallback());
> importer->SetSpacingCallback(exporter->GetSpacingCallback());
> importer->SetOriginCallback(exporter->GetOriginCallback());
> importer->SetScalarTypeCallback(exporter->GetScalarTypeCallback());
>
> importer->SetNumberOfComponentsCallback(exporter->GetNumberOfComponentsCallback());
>
> importer->SetPropagateUpdateExtentCallback(exporter->GetPropagateUpdateExtentCallback());
> importer->SetUpdateDataCallback(exporter->GetUpdateDataCallback());
> importer->SetDataExtentCallback(exporter->GetDataExtentCallback());
> importer->SetBufferPointerCallback(exporter->GetBufferPointerCallback());
> importer->SetCallbackUserData(exporter->GetCallbackUserData());
>
> exporter->SetInput(image);
> exporter->Update();
>
> and then explicitly call Update on the importer as well:
>
> importer->Update();
>
> Everything works properly.  I'm fine with just using this code in my
> program, but perhaps something should be fixed in
> itkImageToVTKImageFilter?  I don't know if adding "importer->Update()"
> to the source would be the proper way of doing things (seems kind of
> like a workaround), or if the UpdateDataCallback method needs to be
> changed.
>
> Thanks,
>
> Charlotte
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