To whom correspondence should be addressed. E-mail: wei. wei@ emails, bjut. edu. cn Wei Wei, born in 1980. He received his master degree in Computer Science Department of University of Applied Science in Gelsenkirchen Germany in 2005. He is a Ph. D. candidate at College of Electric Infor- mation and Control Engineering, Beijing University of Technology. His research interests include the design of algorithms for medical image processing, mulli-modal image registration and stereo vision systems.