Document reading apparatus, image processing apparatus, image forming apparatus, and copying machine
US7813010B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 5, 2005 |
| Grant date | Oct 12, 2010 |
| Priority date | — |
| Expiry date | Jun 17, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/00329
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A driving unit drives an illuminating light. An image pick-up device reads a document in a main-scanning direction. An optical unit projects an image of the document onto the image pick-up device. An extracting unit extracts image signals at a plurality of points in the main-scanning direction of a first position and a second position in a sub-scanning direction. A document detecting unit creates binary data indicating a presence of the document at each of the points based on the image signals extracted. A size detecting unit determines a size of the document in the main-scanning direction based on a distribution of presence and absence of the document.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.