Device and method of correcting dark lines of a scanned image
US6694062B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 5, 1999 |
| Grant date | Feb 17, 2004 |
| Priority date | — |
| Expiry date | Aug 5, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/401
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A device and method of correcting a scanned image generated by a scanner for eliminating dark lines. The scanner is driven to scan a calibration paper. Using the scan data, a plurality of base scan data corresponding to various positions of a scanning line are calculated by averaging the scan data at the same position. Further, a plurality of reference scan data corresponding to various positions of the scanning line are calculated in response to the base scan data with a numerical processing procedure, such as the left-/right-reference algorithm or the curve approximation algorithm. The difference between the base scan data and their corresponding reference scan data is compared with a defect level to mark the defect positions. Finally, the output of the scanned image sensed by the image scanner is corrected by using the defect information, thereby eliminating dark lines.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.