Platen cover for a digital document scanner with electrically switchable reflectance modes
US5790211A · kind A · utility
26Cited by
3References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 8, 1995 |
| Grant date | Aug 4, 1998 |
| Priority date | — |
| Expiry date | Sep 8, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/0422
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system and method digitally scans a document using a high reflectance mode and a low reflectance mode. Initially, a platen cover provides a low reflectance background around the document and the scanner scans the low reflectance background and document to determine an edge of the document or to retrieve other image characteristics of the document. Subsequently, the platen cover changes so as to provide a high reflectance background around the document. The scanner then scans the high reflectance background and the document and produces digital image data relating to an image on the document.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.