Method of decoding a symbol with a low contrast
US7311262B2 · kind B2 · utility
6Cited by
5References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 9, 2004 |
| Grant date | Dec 25, 2007 |
| Priority date | — |
| Expiry date | Aug 9, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/1095
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for encoding a symbol such as a barcode with a finder of a known pattern, comprises steps of determining a potential point on the finder edge and tracing and verifying a path representing the finder edge by checking the color of each point on the path against a threshold. The threshold is preferably reevaluated at least every several pixel movements along the path. The method may decode the barcode directly from the gray image displayed on a LCD screen without a need of a whole characterized image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.