Techniques for reading two dimensional code, including maxicode
US6234397A · kind A · utility
48Cited by
4References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 15, 2000 |
| Grant date | May 22, 2001 |
| Priority date | — |
| Expiry date | Jun 15, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/1456
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The disclosure relates to techniques for determining the presence, orientation and location of features in an image of a two dimensional optical code. The techniques are adapted for use in mapping data in an image pixel plane with grid locations in a grid-based two dimensional code to account for size, rotation, tilt, warping and distortion of the code symbol. Where such a code is a MaxiCode, techniques are disclosed for determining the presence and location of the MaxiCode bulls-eye, orientation modules, primary data modules and secondary data modules.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.