[Insight-users] How to observe a FEM-based registration?

[Luis Ibanez]

Hi Ralf,


The FEMRegistrationFilter is unfortunately not invoking
IterationEvents. That's the reason why a Command/Observer
connected to this filter will not get called.

Please do the following:

1) Edit the file

    Insight/Code/Algorithms/itkFEMRegistrationFilter.txx

2) go to line 1021 and add

         this->InvokeEvent( IterationEvent() );

    just after "  m_TotalIterations++; "

3) recompile your program.


With this, you will be able to connect an Observer for
the iteration event and have a chance to look at the
evolution of the registration at each iteration.

Please let us know if you find any problems,


   Thanks


     Luis


------------------
Ralf o Floca wrote:
> Hello,
> 
> 
> 
> I have a question regarding the observation of a FEM-based registration. The
> itk manual shows the way of observing the iteration process (7.3) and how to
> get aware of level changes in a multi resolution registration (7.6.1). But
> all examples are basing on a rigid registration. I would like to know, if
> there is a possibility to observe the iteration steps and the level changes,
> when using an itkFEMRegistrationFilter. And when it's possible, how to
> manage it. Where must I register the itkcommand derivates then? Just hook it
> into the FEMRegistrationFilter don't seem to work.
> 
> 
> 
> Thank you for your help,
> 
> Ralf o Floca
> 
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