Modified two-dimensional codes, and laser systems and methods for producing such codes
US9269035B2 · kind B2 · utility
6Cited by
13References
36Claims
0Family size
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Key dates
| Filing date | Feb 28, 2014 |
| Grant date | Feb 23, 2016 |
| Priority date | — |
| Expiry date | Feb 28, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/06178
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Each black square within a two-dimensional code can be represented by a distribution of spots. Each spot can be made small enough to be invisible to the human eye so that the two-dimensional code can be invisible on or within transparent or nontransparent materials. The spots can be spaced at a large distance to increase the signal-to-noise ratio for an optical code reader. A laser can be used to produce the spots.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.