Thermal imaging apparatus

Details Thermal imaging apparatus Thermal imaging apparatus

1982-04-15

1984-05-22

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

250332, 250334, H04N 718

Patent

active

044504799

ABSTRACT:
The "narcissus" effect in a thermal imaging apparatus employing scanned arrays of cooled infrared radiation detectors is produced, in part, by the detectors seeing themselves by reflection in the surfaces of the optical elements during the middle part of the scan. The narcissus effect results in a darkened center in the displayed picture. To compensate for this effect, a signal is formed of the sum of the detector outputs. This signal is applied in negative feedback to each detector output. Extended bright or dark areas are suppressed but picture detail special to individual detectors is largely unaffected.

REFERENCES:
patent: 3626091 (1971-12-01), Casper
patent: 4222065 (1980-09-01), Pusch
patent: 4264929 (1981-04-01), Pusch
patent: 4300160 (1981-11-01), Pusch
patent: 4338627 (1982-07-01), Stapleton

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