[ITK-users] Difference between displacement field transform and parametric transform

[Matt McCormick]

Hi,

The displacement field transform is the most flexible transform, but
it has many more parameters than other parametric transforms, which
makes it more difficult to optimize.  It is recommended to first
optimize a simpler parametric transform, then use it in a
CompositeTransform to optimize a displacement field transform.  At a
minimum, rigid body alignment should be performed to ensure the
optimization of the displacement field starts at an initial position
that is sufficiently close to the solution.

HTH,
Matt

On Wed, Oct 14, 2015 at 1:19 PM, stefano serviddio
<s.serviddio at gmail.com> wrote:
> hi,
> I need your help because  I feel confused about the difference between
> displacement field transform and parametric transform. I don't understand
> the basic difference there is using deformablefieldTransform and another
> parametric transformation, like BSpline Transform or Affine Transform. I
> think but I'm not sure that using parametric transform reduce the space of
> solution of my cost function, such as demons metric or mutua information one
>
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