[Insight-users] Demon Registration update pipeline call

[Luis Ibanez]

Hi Rick,

If you are connecting always the same Image Smart Pointer as the input
to the itk::DemonsRegistrationFilter, the filter *does not* considers
that the input has changed.

The first thing that "Set" methods do is to compare the new input with
the existing input, and if they are equal (in this case the pointer to
the image), then it assumes that nothing has changed.


If you are retouching the pixel values of the image and want to ensure
that the pipeline is triggered again, you must invoked

              image->Modified();
              filter->Modified();

or you could do

              filter->Modified();
              filter->Update();



   Regards,


       Luis


----------------------
Rick Shilling wrote:
> Hi-
> 
> I am using an itk::DemonsRegistrationFilter object whose Update() member 
> is called multiple times (in a for loop).  Each time, prior to the 
> Update() call, its SetMovingImage( movingImage ) member function is 
> called because data in movingImage have changed.  Though, after the 
> first Update() call, subsequent  calls do not seem to execute anything 
> (The IterationEvent object added as an observer to the 
> RegistrationFilter does not print expected stdout).  
> 
> Do I need to make an extra call(s) to signal to the 
> itk::DemonsRegistrationFilter object that the pipeline needs to be 
> updated?  Thanks.
> 
> Rick Shilling
> 
> 
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