Document scanner
US4961117A · kind A · utility
21Cited by
13References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 13, 1987 |
| Grant date | Oct 2, 1990 |
| Priority date | — |
| Expiry date | Nov 13, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/401
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A document scanner for utilization with a word processing and/or graphics processing equipment, such as a personal computer environment. The document scanner provides improved pixel compensation and gamma compensation techniques as well as improved control in the illumination process of the scanning of a document.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.