Thermal imager
US4868389A · kind A · utility
7Cited by
3References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 26, 1988 |
| Grant date | Sep 19, 1989 |
| Priority date | — |
| Expiry date | Apr 26, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/21
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A thermal imager is provided with a signal processing circuit which compensates for differences in the sensitivities of the thermal detectors. The compensating circuit produces a signal dependent on the mean output of each detector over a predetermined period, stores the signal in a storage device at a frequency of not more than once each field and applies a correction signal derived from the storage device to the detector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.