[vtkusers] vtkImageThreshold and vtkContourFilter Resolution

[Paulo Henrique Junqueira Amorim]

Hi,

I'm using vtkImageThreshold to segment an image and to generate
vtkContourFilter to generate the vtkPolyData, but the resolution of
vtkPolyData not getting good by comparison when it is used only the
vtkContourFilter to generate vtkPolyData (attached screens).

*Part of the code vtkImageThreshold and vtkContourFilter*

t = vtk.vtkImageThreshold()
t.SetInput(reader.GetOutput())
t.ThresholdBetween(226,3021)
t.SetOutValue(-1024)
t.Update()

contour = vtk.vtkContourFilter()
contour.SetInput(t.GetOutput())
contour.SetValue(0, 226) # Initial threshold
contour.SetValue(1, 3021) # final threshold
contour.ComputeScalarsOn()
contour.ComputeGradientsOn()

[image: vtkImageThreshold.PNG]

*



Part of the code only vtkContourFilter*

contour = vtk.vtkContourFilter()
contour.SetInput(reader.GetOutput())
contour.SetValue(0, 226) # Initial threshold
contour.SetValue(1, 3021) # final threshold
contour.ComputeScalarsOn()
contour.ComputeGradientsOn()


[image: vtkContourFilter.PNG]



Is it possible to use the vtkImageThreshold and vtkContourFilter but the end
result be equal to use only vtkContourFilter to generate polydata ??



Regards,
Paulo Amorim
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