[Insight-users] Problems updating when reading new images

[Luis Ibanez]

Hi Ivan,


The call :

    UpdateLargestPossibleRegion()

is the ITK equivalent of the VTK call

    UpdateWholeExtent()

Please try invoking

      UpdateLargestPossibleRegion()

on the itkVTKImageImport filter in the
VTK to ITK adaptor.  You can get access to
it with the "GetImporter()" method. It will
look like

  m_VTKtoITKAdaptor->GetImporter()->UpdateLargestPossibleRegion();


Please let us know if you continue experiencing
any problems.


Thanks,



    Luis


-----------------------------

Iván Macía wrote:
> Dear all,
> 
>     I'm using VTK together with ITK in a MFC dialog-based app. I read an
> image stack with a single vtkJPEGReader, pass it through several VTK and ITK
> filters and show the results in the screen using an vtkImageActor. To
> connect both pipelines i'm using the functions ConnectPipelines() in
> VTK2ITK2VTK.h. So my pipeline basically consists of :
> 
>     vtkJPEGReader -> ... some VTK filters ... -> vtkImageExport ->
> itk::VTKImageImport -> .... some 	ITK filters ... -> itk::VTKImageExport ->
> vtkImageImport -> ... some VTK filters ... -> 	vtkImageActor
> 
>     The whole thing works fine the first time. Now I try to load another
> JPEG stack and the new images don't appear in the screen. When I load the
> new images, what I do is basically what follows
> 
> 	m_pwndVTKRenderArea->m_vtkImageReader->SetReleaseDataFlag(1); // should
> this be here???
> 	m_pwndVTKRenderArea->m_vtkImageReader->SetFilePattern(strFilePattern);
> 	m_pwndVTKRenderArea->m_vtkImageReader->SetFilePrefix(strPath+strPrefix);
> 
> m_pwndVTKRenderArea->m_vtkImageReader->SetFileNameSliceOffset(nFirstSliceOff
> set);
> 	m_pwndVTKRenderArea->m_vtkImageReader->UpdateInformation();
> 	// I have to do this to set the number of slices to the number of files
> selected
> 	// I ignore if I can do it in a better way
> 	m_pwndVTKRenderArea->m_vtkImageReader->GetDataExtent(pDataExtent); //
> pDataExtent is int[6]
> 	// the extent of images is obtained correctly but I have to set the Z
> extent manually to the 	// number of jpeg files selected
> 
> m_pwndVTKRenderArea->m_vtkImageReader->SetDataExtent(pDataExtent[0],pDataExt
> ent[1],
> 		pDataExtent[2],pDataExtent[3],0,nCount-1);
> 	m_pwndVTKRenderArea->m_vtkImageReader->SetDataSpacing(0.18,0.18,0.8);
> 	m_pwndVTKRenderArea->m_vtkImageReader->UpdateInformation();
> 	// tried also Update() and Modified() here but receive error messages
> 
> m_pwndVTKRenderArea->m_vtkImageReader->GetOutput()->SetUpdateExtentToWholeEx
> tent();
> 	m_pwndVTKRenderArea->Invalidate(); // redraw window
> 
> where m_pwndVTKRenderArea is the render window (a Windows window) and
> m_vtkImageReader is of type vtkJPEGReader.
> 
> After this, an OnPaint message handler is called which calls to
> UpdateWholeExtent() for the last filter in the pipeline. The rest of the
> pipeline remains unchanged.
> 
>     I catch an exception of type "VTKImageImport : Import and buffer sizes
> do not match"
> 
>     Seems like the whole pipeline is not aware that the source data is new
> and has a different extent.
> 
>     I have tried many combinations of methods for updating. I have also
> deleted the vtkJPEGReader and reallocated it but it doesn't work. If
> possible I would like to know what series of steps I should follow to ensure
> that data is updated through the whole pipeline, having in mind that new
> data extent is different.
> 
>     Thank you in advance for your help
> 
>     Regards
> 
>     Ivan
> 
> 
> 
> 
> --------------------------------
> Iván Macía
> Ing. Industrial
> Ing. en Automática y Electrónica
> Asociación VICOMTech
> http://www . vicomtech . es
> Paseo Mikeletegi 57, bajo
> 20.009 Donostia-San Sebastián
> (Gipuzkoa) SPAIN
> Tlfno: (00 34) 943 30 92 30
> Fax: (00 34) 943 30 93 93
> e-mail: imacia at vicomtech . es <mailto:imacia at vicomtech . es>
> 
> ***Member of INI-GraphicsNet***
> http://www . inigraphics . net
> -------------------------------
> 
> 
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