[Insight-users] VTK - ITK - VTK Pipeline problems

[Jesse C Cronce]

Sorry, what I mean is ImageType::Pointer x[20];
On Mon, 2005-10-31 at 14:31 -0500, Jesse C Cronce wrote:
> Is it possible to have ImageType *x[20];
> 
> So that you can disconnect a particular image, make a few parameter
> changes to the filter, call it's upadate method again, and disconnect
> the next image w/out overwriting the memory of the initial image ?
> 
> Thanks,
> JCC
> 
> On Mon, 2005-10-31 at 13:53 -0500, Karthik Krishnan wrote:
> > Jesse C Cronce wrote:
> > 
> > >If you do a DisconnectPipeline, that will also disconnect memory
> > >management of the image from the ITK libraries as well, right ? 
> > >
> > Not if you use smart pointers. (Memory management should be taken care 
> > of) For instance, this is ok if you had
> > 
> > filter->Update();
> > ImageType::Pointer x = filter->GetOutput();
> > x->DisconnectPipeline();
> > 
> > this is not ok.
> > 
> > filter->Update();
> > ImageType* x = filter->GetOutput();
> > x->DisconnectPipeline();
> > 
> > The reference count is needed to prevent x from getting destroyed.
> > 
> > >(meaning
> > >that the memory will have to be deleted/freed when no longer in use)
> > >Also, if you call a GetOutput() on the filter that has been disconnected
> > >from the pipeline, it looks like the result should be a NULL pointer
> > >(from the code itkDataObject.cxx - 
> > >
> > >    m_Source->SetNthOutput(m_SourceOutputIndex, 0);
> > >
> > >) is this also correct ?
> > >
> > >  
> > >
> > yes
> > 
> > >Thanks!
> > >JCC
> > >
> > >On Mon, 2005-10-31 at 10:53 -0500, Karthik Krishnan wrote:
> > >  
> > >
> > >>Did you try to disconnect the objects from teh pipeline ?
> > >>
> > >>In ITK:
> > >>
> > >>filter->Update();
> > >>itkImage = filter->GetOutput();
> > >>itkImage->DisconnectPipeline();
> > >>
> > >>In VTK:
> > >>
> > >>use UnRegisterAllOutputs() to disconnect the pipeline
> > >>or use ShallowCopy
> > >>
> > >>
> > >>
> > >>Istvan Matis wrote:
> > >>
> > >>    
> > >>
> > >>>Hello ITK users,
> > >>> 
> > >>>I am using a complex pipeline to convert vtkImageData to itk Image, 
> > >>>apply some filters on it (each time a different filter) like 
> > >>>smoohting, segmentation, then convert back to VTK in order to 
> > >>>visualize it.
> > >>>My problem is that I receive various errors, "unhandled exceptions" 
> > >>>sometimes in the itk sources sometimes in system dlls, usually when I 
> > >>>want to apply the itk filters for the 2nd time.
> > >>> 
> > >>>I am using the same pipeline several times on several (different) 
> > >>>images read into VTK.
> > >>>As I understood, if one element (object) in the VTK->ITK->VTK pipeline 
> > >>>is destroyed the whole pipeline will crash. In order to prevent this I 
> > >>>use vtkImageCast to "Clone" the final vtk output in order to separate 
> > >>>the output vtkImageData from the whole pipeline.
> > >>> 
> > >>>Here is the sketch of the pipeline:
> > >>> 
> > >>>vtkImageData Input ->
> > >>>-> vtkImageCast ->
> > >>>-> vtkImageData Input 2 ->
> > >>>-> itk::VTKImageToImageFilter ->
> > >>>-> itk::Image ->
> > >>>-> " different itk filter each time: ex: 
> > >>>itk::ConnectedThresholdImageFilter or itk::CurvatureFlowImageFilter " ->
> > >>>-> itk::Image Output ->
> > >>>-> itk::ImageToVTKImageFilter ->
> > >>>-> vtkImageData Output ->
> > >>>-> vtkImageCast ->
> > >>>-> vtkImageData Output 2
> > >>> 
> > >>>I use ->Update() at every step!
> > >>> 
> > >>>By the way I am using itk 2-0-0, vtk 4-4, VC++6 with SP6, WinXP Pro.
> > >>> 
> > >>>Is a solution to recreate (Delete() and New()) all the itk and vtk 
> > >>>filters in the pipeline each time they need to be used? I observed 
> > >>>that if I destroy even one of these filters the whole thing crashes, 
> > >>>and not immediately, but sooner or later, somewhere when vtk needs the 
> > >>>data.
> > >>> 
> > >>>My question is:
> > >>>How can I separate the resulting vtkImage from the whole vtk-itk-vtk 
> > >>>pipeline once it was processed?
> > >>>Or more generally:
> > >>>How can I reuse the whole pipeline on different images with different 
> > >>>sizes and attributes?
> > >>> 
> > >>>Any hints will be gratefully apreciated.
> > >>> 
> > >>>Sincerelly,
> > >>>Istvan
> > >>> 
> > >>> 
> > >>>
> > >>>------------------------------------------------------------------------
> > >>>
> > >>>_______________________________________________
> > >>>Insight-users mailing list
> > >>>Insight-users at itk.org
> > >>>http://www.itk.org/mailman/listinfo/insight-users
> > >>> 
> > >>>
> > >>>      
> > >>>
> > >>_______________________________________________
> > >>Insight-users mailing list
> > >>Insight-users at itk.org
> > >>http://www.itk.org/mailman/listinfo/insight-users
> > >>    
> > >>
> > >
> > >
> > >  
> > >
> 
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