[Insight-users] help black window!

[Renaud Winzenrieth]

Hi everybody,
I have a problem with the cannyfilter.       
This is what I do:

	vtkBMPReader *imageIn=vtkBMPReader::New();
	imageIn->SetFileName("D:/renaud/These/Images/TE_00011.BMP");   
> > 
> >     vtkImageLuminance *il=vtkImageLuminance::New();
> >     il ->SetInput (imageIn-> GetOutput());
> > 
> >     vtkImageCast *cast=vtkImageCast::New();
> >     cast->SetInput(il ->GetOutput());
> >     cast->SetOutputScalarTypeToFloat ();
> > 
> > 
> >     vtkImageExport* vtkExporter = vtkImageExport::New();
> >     vtkExporter->SetInput(cast->GetOutput());
> >     typedef itk::Image<float, 2> ImageType;
> >     typedef itk::VTKImageImport<ImageType> ImageImportType;
> >     ImageImportType::Pointer itkImporter = ImageImportType::New();
> >     ConnectPipelines(vtkExporter, itkImporter);
> > 
> >    typedef itk::CannyEdgeDetectionImageFilter<ImageType, ImageType> 
> >    CannyFilterType;
> >    CannyFilterType::Pointer cannyFilter=CannyFilterType::New();
> >  
> >   cannyFilter->SetInput(itkImporter->GetOutput());
> >   cannyFilter->SetVariance(0.1);
> >   cannyFilter->SetMaximumError(0.1);
> >   cannyFilter->Update();
> > 
> >   typedef itk::VTKImageExport<ImageType> ImageExportType;
> >   ImageExportType::Pointer itkExporter = ImageExportType::New();
> >   itkExporter->SetInput(cannyFilter->GetOutput());
> >   vtkImageImport* vtkImporter = vtkImageImport::New(); 
> >   ConnectPipelines(itkExporter, vtkImporter);
> >  
> >   vtkImageCast *cast1=vtkImageCast::New();
> >   cast1->SetInput(vtkImporter ->GetOutput());
> >   cast1-> SetOutputScalarTypeToUnsignedChar();   
> > 
> >   vtkImageActor* actor = vtkImageActor::New();
> >   actor->SetInput(cast1->GetOutput());
> >    
> >   vtkRenderer* renderer = vtkRenderer::New();
> >   vtkRenderWindow* renWin = vtkRenderWindow::New();
> >   vtkRenderWindowInteractor* iren = vtkRenderWindowInteractor::New();
> >  
> >   renWin->SetSize(256, 256);
> >   renWin->AddRenderer(renderer);
> >   iren->SetRenderWindow(renWin);
> >  
> >   renderer->AddActor(actor);
> >   renderer->SetBackground(0.4392, 0.5020, 0.5647);
> > 
> >   renWin->Render();
> >   iren->Start();
> > 
> > 
> > If I just connect the pipeline without perform the connyfilter, all work 
> > well. But when I use the filter, I only Obtain a black window.
> > What's wrong?
> > Is anybody can help me? 
    Thanks in advance , 
    Renaud