Monitoring registration progress in python - and status of itk vs simpleitk for registration

Beginner Questions
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Any itk.Object in Python can be passed a Python callable, i.e. a Python function on a Python class that has a __call__ method to its AddObserver method. AddObserver takes the specific itk.EventObject to be observed along with the command to execute when the event occurs.

Here is an example:

import itk

image = itk.imread('/home/matt/data/aneurism.nrrd')

normalizer = itk.NormalizeImageFilter.New(image)

def my_python_function():
    print('hey from a python function')
normalizer.AddObserver(itk.StartEvent(), my_python_function)

normalizer.Update()

The examples are in need of updates :slight_smile: :open_book:

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