Optical joint correlator for real-time image tracking and retina

Image analysis – Histogram processing – For setting a threshold

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382 31, 382 32, 382 43, 382 49, 35016213, 350 368, 2502031, 244 317, 364822, 606 6, 606 10, 606 18, G06K 900, G02B 2742, G02B 112, G06E 300

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050292200

ABSTRACT:
A method for tracking an object in a sequence of images is described. Such sequence of images may, for example, be a sequence of television frames. The object in the current frame is correlated with the object in the previous frame to obtain the relative location of the object in the two frames. An optical joint transform correlator apparatus is provided to carry out the process. Such joint transform correlator apparatus forms the basis for laser eye surgical apparatus where an image of the fundus of an eyeball is stabilized and forms the basis for the correlator apparatus to track the position of the eyeball caused by involuntary movement. With knowledge of the eyeball position, a surgical laser can be precisely pointed toward a position on the retina.

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A. D. Gara, "Real-Time Tracking of Moving Objects by Optical Correlation", Applied Optics, vol. 18, No. 2, Jan. 15, 1979, pp. 172-174.
A paper by C. S. Weaver and J. W. Goodman Entitled "A Technique for Optically Convolving Two Functions", Applied Optics, vol. 5, No. 7, Jul. 1966, pp. 1248-1249.
A Paper by Bahram Javidi, Don A. Gregory & Joseph L. Horner Entitled "Single Modulator Joint Transform Correlator Architectures", Applied Optics, vol. 28, No. 3, with Printed Date of Feb. 1, 1989 (Actual Publication Date Unknown).

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