Television – Responsive to nonvisible energy – Infrared
Patent
1995-01-17
1996-08-20
Chin, Tommy P.
Television
Responsive to nonvisible energy
Infrared
H04N 912
Patent
active
055483291
ABSTRACT:
A perceptual delta frame processor for use with a detector array and a noninterlaced video display that produces an image equivalent to that of an image difference processing system. The processor includes a responsivity equalization circuit for processing output signals provided by the detector array that equalize the relative response of its detector elements and provide equalized output signals. A multiplier circuit is provided for inverting the polarity of alternate images to provide constant polarity signals. A contrast control circuit is provided for processing the constant polarity signal to produce optimized video signals that are applied to the noninterlaced video display at a repetition rate above its flicker fusion frequency. Consequently, alternate video frames are averaged by the eye-brain system of an observer, who perceives an image having the quality that is equivalent to an image difference processing system. The present invention provides the benefits of image difference processing, or delta frame processing, without incurring the cost of analog to digital and digital to analog conversion and digital frame storage when it is employed with chopped, thermal detectors such a pyroelectric and bolometer imaging arrays.
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Chin Tommy P.
Denson-Low Wanda K.
Hughes Aircraft Company
Le Vu
Sales Michael W.
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