This book constitutes the refereed proceedings of the 23rd Symposium of the German Association for Pattern Recognition, DAGM 2001, held in Munich, Germany in September 2001. The 58 revised full papers and posters presented were carefully reviewed and selected from a total of 105 submissions. The book offers topical sections on image analysis, 3D-gathering and visualization, image processing, image sequence analysis, classification, active vision, 3D-reconstruction, and interaction of virtual and real worlds.