[ITK-users] Radius in itkVectorGradientMagnitudeImageFilter

[Dženan Zukić]

Hi Kevin,

Using an offset other than 1 makes little sense to me. Can you check what
is done in regular (non-vector) gradient magnitude?

Regards,
Dženan

On Wed, Dec 2, 2015 at 2:49 PM, Kevin H. Hobbs <hobbsk at ohio.edu> wrote:

> 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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