Document reading apparatus for detection of curvatures in documents
US5084611A · kind A · utility
48Cited by
3References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 26, 1990 |
| Grant date | Jan 28, 1992 |
| Priority date | — |
| Expiry date | Sep 26, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/0434
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A document reading apparatus comprising a document table, a reading section disposed above the document table for reading a document, e.g. an opened book, placed on the document table, and a linear light source for emitting light to the opened book at an angle thereto. The reading section includes a sensor for detecting an image of the light emitted to the book. This image displays a brightness distribution over surfaces of the opened book including curvatures adjacent the joint. The brightness distribution is used as a reference for rectifying an image signal corresponding to the opened book when the document image is reproduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.