Radiant energy – Infrared-to-visible imaging – Including means for scanning field of view
Patent
1986-01-30
1987-12-08
Fields, Carolyn E.
Radiant energy
Infrared-to-visible imaging
Including means for scanning field of view
250332, 358113, H04N 533
Patent
active
047120100
ABSTRACT:
An imaging system incorporating a scanned array of infrared detectors for 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 euality 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 as 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. A noise reduction circuit reduces a maximum value of gain for low incremental values of detector signal to exclude noise where signal data is substantially absent.
REFERENCES:
patent: 4013889 (1977-03-01), Fryer
patent: 4225883 (1980-09-01), Van Atta et al.
patent: 4298887 (1981-11-01), Rode
patent: 4302774 (1981-11-01), Alm
patent: 4340888 (1982-07-01), Seroskie
patent: 4419692 (1983-12-01), Modisette et al.
Fields Carolyn E.
Hughes Aircraft Company
Karambelas A. W.
Taylor Ronald L.
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