Pulsed illumination signal modulation control & adjustment method and system
US6788335B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 2000 |
| Grant date | Sep 7, 2004 |
| Priority date | — |
| Expiry date | Mar 9, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/0408
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
One aspect of the invention is a method for signal modulation adjustment. The method comprises illuminating a reference target and a region of film with a first light source for a first time interval. The method further comprises capturing image data from the film in response to a first amount of light reflected from the film with a first sensor for a first integration time. The method also comprises approximately simultaneously producing a first reference output in response to a first amount of light reflected from the reference target in a field of view of a reference sensor. More particularly, the method further comprises adjusting the data in response to the reference output. In a further embodiment, the method comprises adjusting an output illumination level of the first light source in response to the first reference output before a next time interval.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.