Bar code scanning system with the pre-decoding signal processing and method for bar code candidate selection for decoding
US5821520A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 13, 1997 |
| Grant date | Oct 13, 1998 |
| Priority date | — |
| Expiry date | Aug 13, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/14
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system for processing output signals of an electro-optical scanner adapted for reading a bar code indicia having parts of different light reflectivity and non bar code indicia adjacent the bar code on an article being scanned comprises a decoder for decoding content of signals input thereto and signal processing circuitry for receiving the scanner output signals and generating input signals for input to the decoder by deleting signals having non bar code indicia content from the received scanner output signals by examining characteristics of the received scanner output signals. The signal processing circuitry is adapted to generate input signals for input to the decoder for bar code indicia of respective different bar code symbologies. The signal processing circuitry includes deletion circuitry for deleting, from the received scanner output signals, signals having less time duration than a predetermined time duration. The signal processing circuitry also includes one or both of first ratio computation means for computing a ratio of characteristics of adjacent of the received scanner output signals and second ratio computation means for computing a ratio of characteristics of non-…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.