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Proceedings Paper

A Time-Sequenced Rotation And Scale-Invariant Optical Correlator For Multiple Target Recognition
Author(s): Thomas R. Walsh; Jack E. Cravatt; Brian A. Kast; Michael K. Giles
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Paper Abstract

A rotation and scale-invariant optical correlator has been developed, assembled, and evaluated for use as a multiple target recognition system. The system consists of an optical correlator with magneto-optic spatial light modulators (MOSLMs) at the input and filter planes and a vidicon at the correlation plane. A COMPAQ 386 (IBM compatible) personal computer with a frame grabber board is used to acquire, binarize and load binary amplitude-only video images to the input MOSLM, to write sequential stored binary phase-only filters to the filter MOSLM, and to sample and statistically analyze correlation plane data in order to locate and recognize objects of interest in the input scene. The sequential correlations and output data samples are obtained at near video rates (15 per second), allowing multiple targets at any scale and in-plane rotation in a given input image to be located and classified in seconds. Experimental results indicate that this system can correctly identify objects within its target class more than 90% of the time, even in the presence of severe clutter and noise.

Paper Details

Date Published: 5 February 1990
PDF: 17 pages
Proc. SPIE 1151, Optical Information Processing Systems and Architectures, (5 February 1990); doi: 10.1117/12.962220
Show Author Affiliations
Thomas R. Walsh, New Mexico State University (United States)
Jack E. Cravatt, New Mexico State University (United States)
Brian A. Kast, New Mexico State University (United States)
Michael K. Giles, New Mexico State University (United States)


Published in SPIE Proceedings Vol. 1151:
Optical Information Processing Systems and Architectures
Bahram Javidi, Editor(s)

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