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Unfortunately the term normalized mutual information is a bit confusing since there exists several definitions of it. They all share the same insights of producing a value in [0,1] such that a greater value means a better ``score''.
Mutual-information-based registration of medical images: a survey (2003)
The definition given is just the sum of the marginal entropies over the joint-entropy
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Unfortunately the term normalized mutual information is a bit confusing since there exists several definitions of it. They all share the same insights of producing a value in [0,1] such that a greater value means a better ``score''.
Mutual-information-based registration of medical images: a survey (2003)
The definition given is just the sum of the marginal entropies over the joint-entropy
It is moreover related to the entropy correlation coefficient as follows: