Image scanner
US5329382A · kind A · utility
6Cited by
13References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 11, 1991 |
| Grant date | Jul 12, 1994 |
| Priority date | — |
| Expiry date | Dec 11, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/409
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A document image scanner that converts scanned images for output as bilevel images is provided with a bilevel image filter. The bilevel image filter counts the number of continuous pattern elements in each direction, vertical, horizontal and diagonal, from a specific point and compares the results with a predetermined reference. Patterns falling below the reference value are regarded as resulting from background noise and are erased.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.