关键词: 互信息, 多模图像配准, 分块互信息, 配准参数, 质心

Abstract: It would cause mistakes in the process of image registration due to absence of spatial information in the conventional registration method based on mutual information.A multi-modality image registration method is proposed based on block mutual information，which is applied to the registration of visual and infrared image.Firstly，both the infrared and visual images are divided into parts，based on which，the mutual information of each block-pairs is computed.Secondly，the distance between the centroid of the infrared and visual images in each block-pairs is computed，and the parameters of registration are obtained.The sum of the products between the mutual information and the registration parameters for each block pairs is computed，which is used as the criterion of image registration.Experiment results show that，image registration based on block mutual information will get more accurate result than traditional method.

Key words: mutual information, multi-modality image registration, block mutual information, registration coefficient, centroid