Pyroelectric camera signal processing having pedestal signal level compensation
US4694334A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 24, 1985 |
| Grant date | Sep 15, 1987 |
| Priority date | — |
| Expiry date | Dec 24, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/23
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system and method are disclosed for pyroelectric camera signal processing, which processing includes compensating for the effects of pedestal level variations. The pyroelectric videcon tube generates an electrical output signal component indicative of target signal information based upon the sensed thermal energy emitted from the target, and also generates a pedestal component around which the target signal information is centered. A line-by-line DC restorer is provided to re-establish the DC level of the video signal, with the DC level of the restorer being automatically controlled to thereby compensate for variations in pedestal levels due to drift, tube aging, and/or generated by shutter to scene temperature differences.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.