This example illustrates the class :doxygen:`CorrelationChangeDetector` for detecting changes
between pairs of images. This filter computes the correlation coefficient in
the neighborhood of each pixel of the pair of images to be compared.

.. |image1| image:: /Input/ERSBefore.png

.. |image2| image:: /Input/ERSAfter.png

.. |image3| image:: /Output/CorrChDet.png

.. _Figure1:

+--------------------------+-------------------------+-------------------------+
|        |image1|          |         |image2|        |         |image3|        |
+--------------------------+-------------------------+-------------------------+

    ERS Images for Change Detection. Left: Before the flood. Middle: during the
    flood. Right: result of the correlation change detector

