A system and method reduces the amount of variation in a fingerprint image due to distortion from elastic deformation of the finger surface and projection onto a planar coordinate system. The amount and extent of distortion is estimated, and the process is inverted in a systematic way, so that the amount...http://www.google.de/patents/US6466686?utm_source=gb-gplus-sharePatent US6466686 - System and method for transforming fingerprints to improve recognition
