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Proceedings Paper

Optical Joint Transform Image Correlation System
Author(s): Charles F. Hester; Hugh B. Brown
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Paper Abstract

A hybrid digital/optical joint transform correlator has been built for evaluation. The correlator uses a high resolution cathode ray tube, two Hughes liquid crystal light valves, and a Vidicon as the active input and output transducers. A digital frame store and formatter are used to store, format, and provide refresh to the CRT. The specially formatted input on the CRT is imaged on one light valve, whose output transform is written on the second light valve. The output of the second light valve is optically processed to produce the correlation plane on the output Vidicon. The optical correlation system is supported by a digital system which provides images from digital tape or analog tape to the frame store memory. The stored image can then be modified through the digital system for scale and rotation. The output of the correlation can also be digitized for further processing such as fixed pattern background subtraction. This paper describes the joint transform correlator, operating parameters, and future extensions that will overcome present limitations. Future applications of the optical correlation system as a peripheral to digital computing facilities will be discussed.

Paper Details

Date Published: 19 November 1980
PDF: 10 pages
Proc. SPIE 0255, Practical Electro-Optical Instruments and Techniques, (19 November 1980); doi: 10.1117/12.959573
Show Author Affiliations
Charles F. Hester, U.S. Army Missile Command (United States)
Hugh B. Brown, Ampex Corporation (United States)


Published in SPIE Proceedings Vol. 0255:
Practical Electro-Optical Instruments and Techniques
Robert L. Kurtz, Editor(s)

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