[Insight-users] Interpretation of the values in the parameters array - non-rigid image registration?

[motes motes]

When doing non-rigid 2D image registration using the
BSplineDeformableTransform the parameters array contains the
components of the deformation vectors in the following order:

                              x1,x2,..., xN,  y1,y2,...,yN,

But could those parameters not be interpreted as offsets for the
location of the control points in a "classic" free form deformation?

In the below figure the end points of the final deformation vectors
actually corresponds to the final location of the control points in a
2D free form deformation:

http://img163.imageshack.us/i/deformationfield.pdf/

In that context specifying a value in the parameters array actually
just corresponds to specifying an offset to the location of a control
point in the regular grid in a free form deformation.

Does this make sense?