Optical color document reading apparatus wherein an image is blurred on a color image sensor to minimize color moire phenomenon effects
US4675727A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 20, 1985 |
| Grant date | Jun 23, 1987 |
| Priority date | — |
| Expiry date | Mar 20, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B3/0056
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical document reading apparatus which minimizes color moire phenomenon effects including an optical imaging system, and a line image sensor having sensor elements arranged in a line and color filter elements disposed on the sensor elements. A plurality of sensor elements are assigned to one pixel of said document, and the line image sensor senses light reflected from the document through the optical imaging system. The apparatus has a magnification condition which is determined from a distance between the document and the optical imaging system and a distance between the optical imaging system and the image sensor. The magnification is selected to be such that the optical imaging system does not precisely image the document onto the image sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.