Color image copying apparatus
US4661843A · kind A · utility
31Cited by
4References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 9, 1985 |
| Grant date | Apr 28, 1987 |
| Priority date | — |
| Expiry date | Jul 9, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/6019
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A color copying apparatus includes a color image sensor, an image information signal processing unit, and a color printer. The apparatus converts the three color component signals from the color image sensor into a luminance signal component and color difference signal components. At least one of the luminance signal component and the color difference signal components is subject to a nonlinear conversion. For density conversion between an input image and an output image, the luminance signal component is subject to a nonlinear conversion in a nonlinear conversion circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.