Dynamic shading compensation for IR tracking system

Details Dynamic shading compensation for IR tracking system Dynamic shading compensation for IR tracking system

1985-03-25

1986-10-21

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358113, 358211, 250330, 250338, H04N 514

Patent

active

046188924

ABSTRACT:
A circuit which compensates for display shading in a FLIR infrared tracking system utilizes (1) a triangular signal corresponding to scanner motion and (2) a parabolic signal derived as the integral of the triangular signal. By processing both these signals in a multiplier which is biased by a gain signal from the system postamps, a dynamic compensation signal is derived which serves as a level input signal to the post amps. This signal diminishes the effect of variable shading due to two sources, namely postamps and the temperature difference between a scene and the aperture stop of the system. The summation of the triangular and parabolic signals is added to the level input signal thus compensating for the fixed shading due to vidicon and CRT display system components.

REFERENCES:
patent: 4118732 (1978-10-01), Ichijima et al.
patent: 4538181 (1985-08-01), Taylor

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