Optical image to video transfer system having enhanced resolution and contrast for dark areas of the image
US4912558A · kind A · utility
21Cited by
10References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 27, 1988 |
| Grant date | Mar 27, 1990 |
| Priority date | — |
| Expiry date | Dec 27, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/40056
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The translation of an optical image into video signals by a video sensor illuminated by the optical image is adjusted by illuminating the sensor at a first level of light intensity sufficient to provide the video signals at maximum amplitude while adjusting the amplitude of the video signals to a first level, and then illuminating the sensor at a second reduced level of light intensity while adjusting the black level of the video signals so that the black level is at least equal to the amplitude of the signals produced by the sensor in the absence of illumination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.