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

[Karthik Krishnan]

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
>  
>  
>
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