Image reading apparatus
US6438271B1 · kind B1 · utility
13Cited by
15References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1998 |
| Grant date | Aug 20, 2002 |
| Priority date | — |
| Expiry date | Jul 6, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4097
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Two or more original illumination units are mounted on an image reading apparatus. In reading a patched original, an image read while being illuminated along one direction is compared with an image read while being illuminated along another direction or along two directions including the one direction and another direction. In accordance with an image data difference between the two images, image processing or illumination light amount changing is performed to erase shades to be caused by a patched portion of the original.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.