Fast finding algorithm for two-dimensional symbologies
US6173893A · kind A · utility
156Cited by
3References
19Claims
0Family size
Assignee
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Key dates
| Filing date | Apr 16, 1997 |
| Grant date | Jan 16, 2001 |
| Priority date | — |
| Expiry date | Apr 16, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/14
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A plurality of scan lines is used to detect characteristic features of a checkerboard structure or similar pattern structure of symbology within a field of view. The scan lines cross leading edges of the symbology which provides signals to a plurality of processors. The processors detect instances wherein sequential leading edges exhibit angular shifts corresponding to a pattern of the symbology. A further processor is used to detect when a coincidence of these angular shifts occur, thereby providing an indication of the location of the symbology within the field of view.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.