System and method for document size detection in a document reproduction device
US9591158B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 2, 2015 |
| Grant date | Mar 7, 2017 |
| Priority date | — |
| Expiry date | Jun 2, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/1061
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
What is disclosed is a system for determining the size of a document on a platen of a document scanning device. In one embodiment, the scanning device comprises in part: a transparent pane (platen) whereon a hardcopy print is placed; a scan head comprising optical sensors which output a signal comprising an image of that hardcopy print; a plurality of LEDs positioned such that a topside of the platen is illuminated; and a processor for instructing the scan head to pre-scan the print. During the pre-scan, optical sensors comprising the scan head sense light from the LEDs of areas of the platen not covered by the hardcopy print at a first intensity and sense light from the LEDs of areas of the platen which are covered by the print at a second intensity. The processor determines the size of the hardcopy print from the first and second intensity levels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.