He coauthored a textbook on image processing for the medical sciences (Springer-Verlag, Berlin, Germany, 1997) and coedited the handbook of medical informatics (Carl Hanser Verlag, Munich, Germany, 2002). His research interests are discrete realizations of continuous image transforms, medical image processing applied to quantitative measurements for computer-assisted diagnoses, and content-based image retrieval from large medical databases. He received the DAGM-Preis '93. The award from the German Association for Pattern Recognition was given for his work on automatic strabometry using Hough transform and covariance filtering. In 1998, he received the Borcher's Medal from the RWTH Aachen for his work on medical image registration. He is chairman of the German Workshop on Medical Image Processing and vice president of the working group Medical Image Processing within the German Society of Medical Informatics, Biometry and Epidemiology (GMDS). He is chairman of the IEEE Joint Chapter Engineering in Medicine and Biology (IEEE Germany Section). He is a member of the International Association of Dentomaxillofacial Radiology (IADMFR) and the Society of Photo-Optical Instrumentation Engineering (SPIE). He serves on the international editorial board of Dentomaxillofacial Radiology. He is a member of the IEEE.