Zooming Toward Quality

A frame-grabbing system can examine approximately two bar codes per second, while a real-time system can examine 60 bar codes per second (per camera), in either picket fence or ladder orientation.

Edwards claims that video-based verification supercedes laser scanning systems in speed and thoroughness, by scanning the entire height of a bar code in .006à increments, or 167 scans for a 1à bar code, regardless of web speed or orientation. The system determines a score for each scan and combines individual scores for a symbol grade.