Optical Joint Transform Image Correlation System

Charles F. Hester; Hugh B. Brown

doi:10.1117/12.959573

19 November 1980 Optical Joint Transform Image Correlation System

Charles F. Hester, Hugh B. Brown

Proceedings Volume 0255, Practical Electro-Optical Instruments and Techniques; (1980) https://doi.org/10.1117/12.959573
Event: 1980 Huntsville Technical Symposium, 1980, Huntsville, United States

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.

Citation Download Citation

Charles F. Hester and Hugh B. Brown "Optical Joint Transform Image Correlation System", Proc. SPIE 0255, Practical Electro-Optical Instruments and Techniques, (19 November 1980); https://doi.org/10.1117/12.959573

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