Bar-code reader
US7077322B2 · kind B2 · utility
7Cited by
10References
15Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Dec 31, 2003 |
| Grant date | Jul 18, 2006 |
| Priority date | — |
| Expiry date | May 21, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/14
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An extractor extracts a part that is apparently a bar-code signal from a signal that is subjected to opto-electric conversion. A narrow-band differential processor forms a waveform of an edge by differentiating by using a module frequency. The module point extractor extracts the module point from the waveform. The maximum likelihood judgment processor 5f performs ternarizing based on a maximum likelihood method by using broader information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.