Radiant energy – Infrared-to-visible imaging
Patent
1992-07-28
1993-12-07
Fields, Carolyn E.
Radiant energy
Infrared-to-visible imaging
250334, H04N 533
Patent
active
052685756
ABSTRACT:
An infrared observing system is provided such that, after an infrared-ray emitted from an optical/scanning system is converted into an infrared-ray image signal by an infrared detector, an unnecessary high frequency component of the infrared image signal is filtered by a lowpass filter to cut off a high frequency region noise and the output thereof is represented on a display unit. Before or after the lowpass filter, a highpass filter is provided that has a reverse frequency transfer characteristic to a first inclination attenuated frequency transfer characteristic.
REFERENCES:
patent: 3760181 (1973-09-01), Daly et al.
patent: 4675532 (1987-06-01), Carson
patent: 4808822 (1989-02-01), Manning et al.
The Design of an Active Filter, By T. Yanagisawa, Jun. 1, 1974 2nd ed. pp. 25-31 esp. p. 27 L. 1-2.
Fields Carolyn E.
Fujitsu Limited
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