Method and apparatus for decoding two-dimensional bar code using CCD/CMD camera
US5319181A · kind A · utility
390Cited by
4References
46Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 16, 1992 |
| Grant date | Jun 7, 1994 |
| Priority date | — |
| Expiry date | Mar 16, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/06037
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for decoding a two-dimensional bar code symbol using a charge-coupled device (CCD) camera or a charge-modulation device (CMD) camera. The CCD/CMD camera takes pictures of the symbol and the picture is converted into digital data. The location and orientation of the two-dimensional bar code symbol is determined and verified. Defects and damages on the symbol are detected and corrected. The symbol is scanned to read the codewords of the two-dimensional bar code symbol.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.