Television – Special applications – Observation of or from a specific location
Patent
1997-08-26
1999-10-26
Tung, Bryan
Television
Special applications
Observation of or from a specific location
348164, 340567, H04N 718
Patent
active
059737301
ABSTRACT:
Infrared radiation from a light source such as a laser diode illuminates the field of view of a surveillance camera. The amount of illumination is varied in intervals, which may for example, be about 3/4 of a second, by varying the power applied to the light source. The radiation may emanate from optical fibers surrounding a camera lens, or through other ports. The power to the laser diode may be altered in response to background light sensed by a photo cell. A filter on the camera preferentially passes reflected illumination of the source while alternating background illumination.
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Jones Ronald B.
Lang Paul D.
Tranchita Charles J.
An Shawn
Anderson Terry J.
Hoch Jr. Karl J.
Northrop Grumman Corporation
Tung Bryan
LandOfFree
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