Method for automatic prevention of vertical streaks by selectively applying gains to the output signals of optical sensor elements
US6618173B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 7, 1999 |
| Grant date | Sep 9, 2003 |
| Priority date | — |
| Expiry date | Oct 7, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C16/409
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method for automatic prevention of vertical streaks involves processing output signals from a plurality of photosites to determine what gain is appropriate for each output signal. An exemplary preferred method distinguishes between different types of output signals for which a first type of gain is appropriate and other output signals for which a second type of gain is appropriate. The first type of gain is a proportionate gain. The second type of gain is determined from at least one gain which is appropriate for output signals generated by neighbor photosites. The second type of gain is applied to the output signals when the processing indicates that a light-absorbing optical obstruction associated with the photosites generating the output signals appears to be positioned in an optical path of the photosites on or between a scan surface area over which an object to be imaged by the photosites is positioned and a calibration strip facing the scan area surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.