Image reading device with a built-in shielding device and related image scanning method
US6204937A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 18, 1994 |
| Grant date | Mar 20, 2001 |
| Priority date | — |
| Expiry date | Apr 18, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/38
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image reading device that detects the edge of the image to be read and masks the areas outside the edge during the read. The image reading device includes a light transmittance modification device in the optical path between the image illumination source and the photoelectric conversion device. During a pre-scan of the image, the position of the edge of the image is stored in a memory unit. During the actual scan of the image to be read, the edge data is fed to the modification device for each position of the scanner. The modification device blocks out those portions of the area being scanned that are outside the image. In this manner, the image is read while the border area is masked.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.