A method and apparatus for discriminating bar codes for an optical mark reader is provided comprising a scanning means for scanning a target area on a scannable form and producing a signal in response to certain indications, i.e., marks or spaces, in the target area, detection means for detecting indications...http://www.google.de/patents/US5086215?utm_source=gb-gplus-sharePatent US5086215 - Method and apparatus for discriminating or locating bar codes for an optical mark reader
