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

[stefano serviddio]

Hi Matt,
I did what you have said, indeed I make a rigid registration before a
demons registration, but the metric is too high yet. thank you for your
primpt reply.

Il giorno mer 14 ott 2015 alle ore 19:49 Matt McCormick <
matt.mccormick at kitware.com> ha scritto:

> 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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