Image reading system
US6747765B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 28, 1998 |
| Grant date | Jun 8, 2004 |
| Priority date | — |
| Expiry date | Sep 28, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/0416
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image reading system constructed as in the following in order to shorten a time from a turn-on of an original illuminating lamp to a substantial image reading operation and perform a high speed scanning. A position and size of an original which do not require a stable light amount of the original illumination lamp are read during a forwards pre-scanning operation period (tps) during which the light amount is unstable after the start of the pre-scanning. During the period (tacs1) after a timing (t1) when the light amount becomes stable during the forwards pre-scanning operation, an original color information is read from an area of the original from which the color information cannot be read during the backwards pre-scanning operation. Accordingly, the total time required for the pre-scanning operation can be made shorter than that required by a conventional pre-scanning operation which reads the original information and color information only during the forwards pre-scanning operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.