Digital document scanning system
US4672186A · kind A · utility
32Cited by
21References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 19, 1985 |
| Grant date | Jun 9, 1987 |
| Priority date | — |
| Expiry date | Nov 19, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K17/00
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system for scanning and digitizing printed documents for subsequent storage, retrieval and manipulation. Documents are continuously transported across the focal plane of a stationary scanner, and are repetitively scanned in a single axis. In a preferred embodiment, two scanners are employed to permit scanning and digitization of both sides of a particular document in a single pass through the transport mechanism. Circuitry is included in the scanner which permits the presence or absence of a document to be detected and allows dynamic adjustment of threshold levels, thereby accomodating documents which utilize shaded backgrounds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.