[Insight-users] Python Wrapping: Return an itkImage Object

[Glen Lehmann]

Hi Hua,

I avoid this when converting from itk::Image to vtkImageData by doing 
the following;

    def ITK2VTK(self, itkImage):
        # this will form the end-point of the ITK pipeline segment
        itkExporter = itk.itkVTKImageExportF2_New()
        itkExporter.SetInput( itkImage )

        # the vtkImageImport will bring our data back into VTK-land
        vtkImporter = vtk.vtkImageImport()

        # do the magic connection call (once again: only available if 
you built
        # ITK with ITK_CSWIG_CONNECTVTKITK set to ON)
        CVIPy.ConnectITKF2ToVTK(itkExporter.GetPointer(), vtkImporter)

        imageData = vtk.vtkImageData()
        imageData.DeepCopy( vtkImporter.GetOutput() )

        return imageData

However, when converting from vtkImageData to itk::Image I get the same 
seg. faults that you do because I can't preform a deep copy operation on 
the itk::Image.  Is there an equivilant operation in itk?

Glen

Hua Qian wrote:

> Hello,
>
> Here are two little python classes to test returning an
> itkImage object. One class works and the other gives
> segmentation fault. Could someone confirm that and
> explain why?
>
> Regards,
> Hua
>
> from InsightToolkit import *
>
> class testReturnImage1:
>    def __init__(self):
>        self._reader = itkImageFileReaderF2_New()
>        self._reader.SetFileName("../../Testing/Data/Input/cthead1.png")
>        self._image = self._reader.GetOutput()
>
>    def GetImage(self):
>        return self._image
>
> class testReturnImage2:
>    def __init__(self):
>        reader = itkImageFileReaderF2_New()
>        reader.SetFileName("../../Testing/Data/Input/cthead1.png")
>        self._image = reader.GetOutput()
>          def GetImage(self):
>        return self._image
>
> app1 = testReturnImage1()
> image = app1.GetImage()
> print "app1: updating image ... "
> image.Update()
> print "     Done."
>
> app2 = testReturnImage2()
> image2 = app2.GetImage()
> print "app2: updating image ... "
> image2.Update()
> print "      Done."
>
>
>
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