Decoding bar code symbols by determining the best alignment of partial scans
US5278398A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 28, 1991 |
| Grant date | Jan 11, 1994 |
| Priority date | — |
| Expiry date | Oct 28, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/14
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for decoding bar code symbols in which a bar code reader and associated components scan a bar code symbol, produce a representation of the symbol, and attempt to decode that representation in order to produce a character message. The method consists of the steps of storing a first representation of the bar code symbol corresponding to a first scan path through a first portion of said symbol smaller than the entire symbol, and storing a second representation of the bar code symbol corresponding to a second scan path through the symbol. The method then processes said representations in the event a successful decode has not taken place by utilizing the signal from a first scan with the signal from a subsequent scan to determine the best alignment at which successive scans can be concatenated to form a combined signal. The process is repeated with different subsequent scans until successful decoding of the combined signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.