Optical image reading apparatus capable of reading multi-colored original
US5021877A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Oct 20, 1988 |
| Grant date | Jun 4, 1991 |
| Priority date | — |
| Expiry date | Oct 20, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/0281
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical image reading apparatus for photoelectrically reading images formed in at least two colors on a surface of an original having a base color different from the at least two colors, including a first reading device for obtaining a first image signal for each of a multiplicity of reading spots in a predetermined area on the original. The first image signal has two different levels one of which corresponds to the base color and the other of which corresponds to the at least two colors. The apparatus further includes a second reading device for obtaining a second image signal for the each reading spot. The second image signal cooperates with the first image signal to discriminate each of the at least two colors from the other of the at least two colors. Provisions are made for determining whether the levels of the first image signals for all of the multiplicity of reading spots are equal to the above-indicated one level corresponding to the base color, or not. If so, the second reading device is inhibited from operating to obtain the second inage signal for each reading spot.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.