A currency identification system has at least two laterally displaced scanheads, one or more laterally moveable scanheads, or at least two laterally displaced sensors of a linear scanhead, the scanheads or sensors being positioned so as to permit scanning along at least two segments on a first side of...http://www.google.de/patents/US6072896?utm_source=gb-gplus-sharePatent US6072896 - Method and apparatus for document identification
