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Normalised Mutual Information (NMI)

Studholme [35] and Maes[36] suggested that some normalisation should be applied to mutual information as was described above. Quite a few steps are involved in this normalisation process and the full mathematical summary is left to the literature32.

The main difference is that the expression used for MI is significantly extended and divided by a normalisation term. The method is predominant in non-rigid registration as it yields good results