Methods and apparatus for dual channel video recovery in bar code scanners
US6497366B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 31, 1997 |
| Grant date | Dec 24, 2002 |
| Priority date | — |
| Expiry date | Dec 31, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/10851
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A dual channel video data recovery system for use in a bar code scanner. A first and a second video signal are generated in parallel in response to light reflected from a bar code. The first and second video signals are received and filtered to limit their frequency ranges and produce filtered first and second video signals. The first and second filtered video signals are limited to different and preferably coverlapping frequency ranges. The first and second video signals have differing thresholds which may be dynamically varied. The first and second filtered video signals are converted to first and second digital data strings. If both strings contain useful data, the string containing the higher-quality data is decoded to recover bar code information. If only one string contains useful data, the string containing useful data is decoded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.