Image signal processing device
US4468703A · kind A · utility
37Cited by
3References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 14, 1982 |
| Grant date | Aug 28, 1984 |
| Priority date | — |
| Expiry date | May 14, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/403
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image signal processing device uses an automatically varied threshold value calculated from the average density and the density distribution of an original (document, etc). The threshold value is periodically updated at predetermined intervals, so that the overall image may be reproduced with high fidelity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.