Image enhanced optical correlator system
Patent 5107351 Issued on April 21, 1992. Estimated Expiration Date: 
February 16, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 16, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References H331 3398269 3697757 3773401 3779631 3829832 Positional, rotational and scale invariant optical correlation method and apparatus Rotationally independent optical correlation for position determination Optical detection of geometric configurations Holographic signature processor InventorsAssigneeApplicationNo. 481446 filed on 02/16/1990US Classes:359/11, Spatial, phase or amplitude modulation349/17, Computational system employing liquid crystal element (neural network, correlation device, optical computer)359/19, Lens359/29, Fourier transform holography359/256, With birefringent element359/561, For correlation382/210Spatial filtering (e.g., holography)ExaminersPrimary: Arnold, Bruce Y.Assistant: Shafer, Ricky D. Attorney, Agent or FirmInternational ClassesG02B 005/30G02B 027/46 AbstractAn image enhanced optical correlator system providing for optical preprocessing of an input image prior to processing thereof in an optical correlator. The optical preprocessing is provided to enhance the image and/or image related characteristics such that the probability of detection of prescribed targets therein in the optical correlator is increased. In the system, an input image beam is split into orthogonally polarized image inputs, processed to enhance targets therein, and then the algebraic result (addition and/or subtraction) thereof is processed through an optical correlator. Techniques are used in the feedback systems to enhance the output plane correlation signal detection by an adjustment in phase, spatial frequency filtering and/or threshold setting optimization.Other References
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