Holographic-based bar code symbol position detection system for producing bar code symbol position data specifying the position of a detected bar code symbol within a 3-D scanning volume above a conveyor belt structure
US6290132A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 17, 1999 |
| Grant date | Sep 18, 2001 |
| Priority date | — |
| Expiry date | Feb 17, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K2207/1018
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A laser scanning system capable of producing information specifying the subregion of space within a 3-D scanning volume within which a bar code symbol is detected by a laser scanning pattern. The system comprises a laser scanning pattern generator, a scan data processor, a bar code symbol position data generator and a system controller. In the illustrative embodiment, the laser scanning pattern generator employs a holographic scanning disc to generate an omnidirectional laser scanning pattern within the 3-D scanning volume for scanning a bar code symbol presented therein, and in response thereto, automatically produces scan data indicative of the scanned bar code symbol. The scan data processor automatically processes the produced scan data so as to detect the scanned bar code symbol within the 3-D scanning volume. The bar code symbol position data generator automatically determines a subregion of space within the 3-D scanning volume wherewithin the detected bar code symbol is scanned by the laser scanning pattern, and automatically produces bar code symbol position data indicative of this subregion of space. By virtue of the present invention, it is now possible to generate, on a …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.