Method and apparatus for improving the throughput of a CCD bar code scanner/decoder
US5196684A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 1991 |
| Grant date | Mar 23, 1993 |
| Priority date | — |
| Expiry date | Mar 25, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/1092
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for scanning and decoding the symbols of a bar code label using a CCD image sensor viewing the bar code, and coupled to a signal processor and memory, wherein initially a start of scan (SOS) first level signal is sent from the processor to the CCD image sensor, a digital data signal representative of the bar code is read from the CCD sensor, and the representative data signal read from the CCD sensor is stored in memory. When the SOS signal is at a second signal level, the stored data is validated and decoded to determine if the representative data is valid or invalid. The SOS first level signal is immediately restarted in response to an invalid bar code data signal to recollect bar code data signals from the CCD sensor viewing the bar code so that the scanning steps are repeated, or the SOS first level signal is immediately restarted to re-scan the bar code symbols immediately after the data signal is found valid. Thus, the CCD data collecting scan rate is maximized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.