[Insight-users] Stopping registration

[Karthik Krishnan]

Almost all registration methods check if they've been halted/aborted after
every iteration and then return with the last computed parameters.

The base class itk::FiniteDifferenceImageFilter 's GenerateData() method
looks like this :

while (!this->Halt())
{
  // Do interation
}

You will just need to override this method in your registration method to
check for some flag, just like PDEDeformableRegistration::StopRegistration()
does .


-- 
Karthik Krishnan
R&D Engineer,
Kitware Inc.

On 11/11/07, Monica Hernandez <mhg at unizar.es> wrote:
>
> Dear ITK users,
>
> I am working with a child class of a PDEDeformableRegistrationFilter
> that uses a sum of squared differences of the images for the energy
> metric. I would like to stop registration when some condition on the
> energy curve is hold. In order to do that, my idea was to create a
> Command Observer in order to track the energy values and see if my
> condition holds and stop registration by invoking stopping registration
> methods. The code would look like something like this
>
> void Execute(const itk::Object * object, const itk::EventObject & event)
>       {
>           const MyPDERegistrationFilterType * filter = dynamic_cast<
> const MyPDERegistrationFilterType * >( object ) ;
>
>          if( cond )
>         {
>           cout << "Stopping algorithm at iteration " <<
> filter->GetElapsedIterations() - 1 << ". Condition holds." <<endl;
>
>          // Here I would like to invoke to a method stopping registration
>        }
>      }
>
> Can registration classes at ITK be "externally" stopped?
> If so, what is the correct way of doing that?
> If not, what could be an alternative way?
>
> Thank you very much in advance.
> Monica Hernandez.
>
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