[vtkusers] Export data from VTK to ITK

[Massi]

I got the previous error by changing mesh to image and use
itkvtkImageToImageFilter instead of  itkVTKImageImport 

#include "vtkDICOMImageReader.h" 
#include "vtkContourFilter.h" 
#include "vtkPolyDataConnectivityFilter.h" 
#include "vtkImageExport.h" 
#include "itkVTKImageImport.h" 
#include "itkMesh.h" 
#include "itkImageFileWriter.h" 
#include "vtkImageToImageFilter.h"

int main(int argc, char *argv[]) { 

vtkSmartPointer<vtkDICOMImageReader> Read = 
vtkSmartPointer<vtkDICOMImageReader>::New(); 
Read->SetDirectoryName(filename.c_str()); 
Read->Update(); 
    
//Get the contour of the PolyData 
vtkSmartPointer<vtkContourFilter> contour =
vtkSmartPointer<vtkContourFilter>::New(); 
contour->SetInput(Read->GetOutput()); 
contour->ComputeScalarsOff(); 
contour->SetValue(0,0.5); 
    
//Mesh the largest contour 
vtkSmartPointer<vtkPolyDataConnectivityFilter> connectivityFilter =
vtkSmartPointer<vtkPolyDataConnectivityFilter>::New(); 
connectivityFilter->SetInput(contour->GetOutput()); 
connectivityFilter->SetExtractionModeToLargestRegion(); 
connectivityFilter->Update(); 
    
//Export vtk Data to ITK 
vtkImageExport* exportdata = vtkImageExport::New(); 
exportdata->SetInput(connectivityFilter->GetOutput()); 
    
vtkSmartPointer<vtkImageExport> exportdata =
vtkSmartPointer<vtkImageExport>::New();
exportdata->SetInput(connectivityFilter->GetOutput());

typedef itk::Image<unsigned short, 3> ImageType;
typedef itk::VTKImageToImageFilter<ImageType> itkvtkConverter;
itkvtkConverter::Pointer conv =itkvtkConverter::New();
conv->SetInput(exportdata->GetOutput());

return EXIT_SUCCESS;; 
} 



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