Data code label, a method of decoding data codes, and an optical data code decoding system
US6722565B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 20, 2002 |
| Grant date | Apr 20, 2004 |
| Priority date | — |
| Expiry date | Jun 15, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/08
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A data code label including a QR code and an ID tag including a memory having an identification code area and a decode data writing area. A data code in the QR code showing an error in decoding is corrected and stored in the memory in the ID tag while the degree of defection of the QR code is low. When the defects advance, the error rate will increase. If the error occurs after advance of defects, the decode data in the memory is read when the error is detected. If the decode data cannot be read, the error correction is effected. If the error rate is higher than a reference, the decode data is obtained from the memory. If this decreases the error rate under the reference, the error correction is effected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.