Image analysis – Histogram processing – For setting a threshold
Patent
1983-04-01
1989-09-12
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
342 44, 342 54, 455604, 455609, 455611, H04B 900, G06K 900
Patent
active
048667811
ABSTRACT:
An optical system for determining if a target object is an object of a first kind, including means for illuminating the target object along an incident path with coherent light of a selected nature means, for retro-reflecting coherent light from an object of a first kind, means for detecting the nature of light reflected from at least a portion of the target object, means for comparing the nature of the detected light to the selected nature, and means for indicating that said target object is an object of a first kind if the nature of said detected light is the same as the selected nature. Alternative embodiments include encoding interrogating and retro-reflected light signals at both the interrogating station and target stations, and the use of a verification signal directed at the target object prior to illumination of the target object with an interrogating beam. Phase conjugate mirrors are preferably employed as the retro-reflecting means and it is preferable that the phase conjugate mirror be comprised of HgCdTe. Methods of determining whether a target object is an object of a first kind, corresponding to the disclosed devices, are also disclosed.
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patent: 3989942 (1976-11-01), Waddoups
patent: 4005935 (1977-02-01), Wang
patent: 4134008 (1979-01-01), DeCorlieu et al.
patent: 4215936 (1980-08-01), Winocur
patent: 4249265 (1981-02-01), Coester
Yariv, Amnon, "Phase Conjugate Optics and Real-Time Holography", IEEE Journal of Quantum Electronics, vol. QE-14, No. 9, Sept., 1978, pp. 650-660.
Giuliano, Concetto R., "Applications of Optical Phase Conjugation", Physics Today, Apr., 1981, pp. 27-35.
Borken Richard J.
Durand William W.
Boudreau Leo H.
Honeywell Inc.
Shudy Jr. John G.
Udseth William T.
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