Two-dimensional code, methods and apparatuses for generating, displaying and reading the same
US7032823B2 · kind B2 · utility
58Cited by
4References
24Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 27, 2004 |
| Grant date | Apr 25, 2006 |
| Priority date | — |
| Expiry date | Mar 22, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K2019/06225
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In a two-dimensional code, a plurality of unit cells are arranged in two-dimension. Each of the unit cells indicates one of at least three colors, such as, “white”, “black”, “red”, “blue”, and “green”. Each color of each of the unit cells is optically readable and represents a data value set to each of the unit cells. In the two-dimensional code, a specifying pattern portion is provided. The specifying pattern portion includes a plurality of color reference cells and is configured to specify positions of the unit cells. The color reference cells indicates all of the at least three colors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.