Radiant energy – Infrared-to-visible imaging
Patent
1986-01-30
1988-01-12
Howell, Janice A.
Radiant energy
Infrared-to-visible imaging
250332, 250334, G02F 101, H01L 2500, G02B 2610
Patent
active
047193506
ABSTRACT:
An imaging system incorporating a scanned array of infrared detectors for a presentation of scene data on a display includes gain normalization circuitry coupled to individual ones of the detectors of the detector array. The normalization circuitry is structured as a feedback loop introducing equality between the magnitude of an average value of a detector signal and a reference signal. The imaging system comprises a set of channels connecting with respective ones of the detectors, each channel having adaptive gain control circuitry. A common value of the reference signal is applied to each channel for uniformity in a displayed image. The averaging time is several times greater than the duration of a single scan in the scanning of the detector array so that the display is relatively free of nonuniformities associated with differing responsivities of the detectors to infrared radiation. A nonlinear gain function is produced by connection of multipliers and/or logarithmic circuitry in a forward branch of the loop. A feed forward branch includes a filter coupled to the multipliers for adaptive accentuation of higher frequencies of the signal spectrum to enhance subject edge lines.
REFERENCES:
patent: 4225883 (1980-09-01), Van Atta et al.
patent: 4362938 (1982-12-01), Bosserman
patent: 4403148 (1983-09-01), Coon et al.
Howell Janice A.
Hughes Aircraft Co.
Karambelas A. W.
Taylor Ronald L.
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