In a bar code scanning systems, a variety of decoding methods may be systematically implemented to effect decoding of label information from scans of label data. Differently aggressive decoding methods may be selected, either manually or automatically (such as by programming in a variety of manners)...http://www.google.com.hk/patents/US6561427?utm_source=gb-gplus-share專利 US6561427 - Decoding system and methods in a bar code scanning system
