[Insight-developers] Composite Transform -- how to copy?

[M Stauffer (V)]

I think there should be a method added to do this, maybe
Transform::Clone. Most transforms would be fine with the base
implementation that copies parameters and fixed parameters. Specialized
transforms would implement their own.

We could use this method for a bit of memory and speed optimization in
some new classes too.

In addition to the composite transform, the displacement field
transforms are also more complicated b/c of the options for the update
smoothing. Maybe these should be included with the fixed parameters? The
displacement field parameters/data itself can be copied simply using
SetFixedParameters and SetParameters. So it's the smoothing options that
are a sticking point here, but easy to handle either way. Not sure about
the BSplineDisplacementField transform.

-M

>-----Original Message-----
>From: insight-developers-bounces at itk.org 
>[mailto:insight-developers-bounces at itk.org] On Behalf Of 
>Williams, Norman K
>Sent: Tuesday, November 08, 2011 12:33 PM
>To: ITK
>Subject: [Insight-developers] Composite Transform -- how to copy?
>
>Is there a 'create a copy of a transform' method in the transform
>hierarchy?
>
>The reason I ask is that I'm trying to re-write some BRAINS code that
>reads transform files.  The existing code reads the transform list, and
>then creates a new instance of the appropriate transform type, 
>and fills
>it in with SetParameters and SetFixedParameters.
>
>In trying to support CompositeTransforms, Setting the parameters won't
>work at all.  What it looks like I need to do is get the 
>transform Queue,
>and for each transform in the queue, create a new transform 
>and add it to
>my copy, and read out the 'transform-to-optimize' flags for 
>each and set
>it on the new transform.
>
>This seems like a lot of work that shouldn't be replicated 
>every place a
>Composite Transform needs copying.
>
>--
>Kent Williams norman-k-williams at uiowa.edu
>
>
>
>
>
>
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