[vtkusers] cannot return output of itk::ImageToVTKImageFilter

[Prathamesh Kulkarni]

Hello all,

I am converting an ITK image to VTK image and rendering it. However, I am
not able to return the filter's output from the function which does the
conversion. Following is a code snippet.

vtkSmartPointer<vtkImageData> convertITKImageToVTKImage(void
*itk_img_void_ptr){
    typedef float PixelType;
    const unsigned int dimensions = 2;
    typedef itk::Image<PixelType, dimensions> ImageType;

    ImageType::Pointer itk_img = ImageType::New();
    ImageType::Pointer *itk_img_ptr = (ImageType::Pointer*)itk_img_void_ptr;
    itk_img = itk_img_ptr->GetPointer();

    typedef itk::ImageToVTKImageFilter<ImageType> ITKToVTKFilterType;
    ITKToVTKFilterType::Pointer ITK_to_VTK_filter =
ITKToVTKFilterType::New();

    ITK_to_VTK_filter->SetInput(itk_img);
    ITK_to_VTK_filter->Update();

    vtkSmartPointer<vtkImageData> vtk_image =
ITK_to_VTK_filter->GetOutput();
    //vtk_image->Update();

    //uncomment to test.. THIS RENDERING WORKS
    renderImage(castImage(vtk_image, std::string("unsigned char")), true);

    return vtk_image;
}

void foo(){
    vtkSmartPointer<vtkImageData> BScan_vtk_image =
convertITKImageToVTKImage(itk_image_void_ptr);

    //THIS RENDERING FAILS - ERROR: unhandled exception at
itkVTKImageExportBase.cxx
    renderImage(OCTCommon::castImage(BScan_vtk_image, std::string("unsigned
char")), true);
}


Please point me out, where am I going wrong?

Thanks,
Prathamesh
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