Motion detection, novelty filtering, and target tracking using a

Details Motion detection, novelty filtering, and target tracking using a Motion detection, novelty filtering, and target tracking using a

1990-08-16

1991-05-28

Buczinski, Stephen C.

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

356345, 356347, 2502019, G01P 336, G01B 902, G01B 921

Patent

active

050188526

ABSTRACT:
A method and apparatus for detecting and tracking moving objects in a noise environment cluttered with fast- and slow-moving objects and other time-varying background. A pair of phase conjugate light beams carrying the same spatial information commonly cancel each other out through an image subtraction process in a phase conjugate interferometer, wherein gratings are formed in a fast photorefractive phase conjugate mirror material. In the steady state, there is no output. When the optical path of one of the two phase conjugate beams is suddenly changed, the return beam loses its phase conjugate nature and the interferometer is out of balance, resulting in an observable output. The observable output lasts until the phase conjugate nature of the beam has recovered. The observable time of the output signal is roughly equal to the formation time of the grating. If the optical path changing time is slower than the formation time, the change of optical path becomes unobservable, because the index grating can follow the change. Thus, objects traveling at speeds which result in a path changing time which is slower than the formation time are not observable and do not clutter the output image view.

REFERENCES:
patent: 3572882 (1971-03-01), Neumann
patent: 4215936 (1980-08-01), Winocur
patent: 4571080 (1986-02-01), Papuchon et al.
patent: 4575245 (1986-03-01), Borde
patent: 4659223 (1987-04-01), Huignard et al.
patent: 4767195 (1988-08-01), Pepper
patent: 4921353 (1990-05-01), Chiou et al.
Fischer, Baruch et al., "New Optical Gyroscope Based on the Ring Passive Phase Conjugator", Appl. Phys. Lett. 47 (1), Jul. 1985.

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