Document with indexes and associated document reader system
US7350718B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 17, 2004 |
| Grant date | Apr 1, 2008 |
| Priority date | — |
| Expiry date | Dec 2, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/06037
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A document with indexes and associated document reader system. The document is constructed by printing plural pixels and divided into plural areas. Each of the areas has plural indexes respectively consisting of a group of indexing dots to represent an area code corresponding to the area. The indexes and the pixels have different optical reflection features. The system includes a filter, a pattern sensor and a pattern decoder. The filter allows a light with special wavelengths to pass through, so as to obtain a desired light corresponding to the indexes of the document. The sensor is connected to the filter for sensing the light passed through and accordingly forming a pattern to output. The decoder is connected to the sensor for decoding and thus obtaining corresponding indexes in accordance with the pattern outputted by the sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.