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Proceedings Paper

Evaluation of display system enhancements to assist an operator in the detection of point targets
Author(s): Robert D. Reeves; Craig Thornton
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Paper Abstract

A series of experiments are described which quantify an operator's ability to detect an unresolved target in backgrounds representative of a slow scan, large volume infrared surveillance system. An inverse relationship was found between screen refresh rates and the probability of target detection, with high refresh rates asymptotically approaching a contrast limited threshold and low rates producing a higher detection threshold than can be attributed to eye integration effects alone. The effects of amplitude quantization on contrast threshold over a range of noise conditions revealed that quantization levels below the observer's contrast threshold had no effects on performance. An evaluation of azimuth data compression techniques indicated that a predictable threshold dependence was found, based on the mean and standard deviation of the background statistics. An investigation of the operator's ability to detect a uniform target of fixed but unknown dimensions revealed a contrast threshold dependence proportional to the square root of the target area, with contrast threshold sensitivity decreasing for large target areas.

Paper Details

Date Published: 1 October 1990
PDF: 14 pages
Proc. SPIE 1309, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing, (1 October 1990); doi: 10.1117/12.21760
Show Author Affiliations
Robert D. Reeves, Spar Aerospace Ltd. (Canada)
Craig Thornton, Spar Aerospace Ltd. (Canada)

Published in SPIE Proceedings Vol. 1309:
Infrared Imaging Systems: Design, Analysis, Modeling, and Testing

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