Mutual information is widely used as a similarity metric for image registration.Usually similarity metric is based on Shannon definition of entropy.One generalized entropy named as Renyi entropy is used and a new image registration algorithm is proposed based on generalized mutual information.Firstly Renyi entropy with smaller q is used for global searches
here Renyi entropy can remove some unwanted local optimum;secondly
the local one is used to locate the global optimal solution by searching the current local optimal ones.The normalized mutual information measure based on Renyi entropy with q→1 is taken as the objective function.The experiment results show that the mutual information image registration algorithm based on Renyi entropy is better than the normalized mutual informatron image registration algorithm