[vtkusers] About gradient

[Tom]

Dear all,
Does anyone have a experience to implemt one dimensional gradient of an 2D
image?
For example, I have a 2D image, and I wana get x-direction and y-direction
gradients of this image. Below is a sample code.
If u have any experience, plz show me.
--
vtkImageData *blurimg=vtkImageData::New();
    blurimg=GaussianSmooth->GetOutput();

    vtkImageGradient *imgGradient=vtkImageGradient::New();
    imgGradient->SetInput(blurimg);
    imgGradient->SetDimensionality(2);
--

Kind Regards,
 Tom
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