[Insight-users] Using observer on Transform?

[motes motes]

Typically an observer is connected to an optimizer like:

      optimizer->SetNumberOfIterations(number_of_iterations);
      optimizer->MinimizeOn();
      optimizer->AddObserver(itk::IterationEvent(), observer);


In the observer its then possible to retrieve the optimizer and read
(or even modify) the parameters:

		void Execute( itk::Object * object, const itk::EventObject & event) {
			OptimizerPointer optimizer = dynamic_cast< OptimizerPointer >( object );
			if( ! itk::IterationEvent().CheckEvent( &event ) ) {
				return;
			}
			std::cout << optimizer->GetCurrentIteration() << " = " <<
optimizer->GetValue() << " : " << optimizer->GetCurrentPosition() <<
std::endl;
                         // do modifications...



Now I would like to be able to do the the same thing with a transform
that I have made.

What I need is to modify some parameters in the transform after a
certain number of iterations.  Is it somehow possible to get the
transform connected to the image registration method in the above
Execute method in each iteration?