[ITK] [ITK-users] Radius in itkVectorGradientMagnitudeImageFilter

[Kevin H. Hobbs]

For the attached program I see no difference in the output between

  radius[0] = 1;
  radius[1] = 1;
  radius[2] = 1;

and

  radius[0] = 8;
  radius[1] = 8;
  radius[2] = 8;

The RadiusType m_NeighborhoodRadius is set, printed, and used to expand
the requested region but the gradient calculations use central
differences only between pixels adjacent to the neighborhood center :

  d_phi_du[i][j] = ... it.GetNext(i)[j] - it.GetPrevious(i)[j]...

Should these be :

  NeighborhoodIndexType ri = m_NeighborhoodRadius[i];
  d_phi_du[i][j] = ... it.GetNext(i,ri)[j] - it.GetPrevious(i,ri)[j]...

?
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