Color copying machine using signal conversion
US4469433A · kind A · utility
22Cited by
5References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 28, 1982 |
| Grant date | Sep 4, 1984 |
| Priority date | — |
| Expiry date | Oct 28, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/40
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A color copying machine includes a device separating the image information from each area of the original into colors corresponding to predetermined recording colors to thereby form corresponding video signals. A preferential selection circuit converts each video signal into a 2-level signal and performs an arithmetic operation on each 2-level signal to thereby key the image information from each area of the original to one of the recording colors or white. Black is selected as the recording color if a chromatic color competes with black in the same area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.