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Proceedings Paper

Guidelines for accurate TOD measurement
Author(s): Piet Bijl; J. Mathieu Valeton
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Paper Abstract

Guidelines to perform Triangle Orientation Discrimination (TOD) measurements are given in the present paper. The optimal range of test pattern sizes and contrasts are specified, as well as the required number of presentations for a threshold estimate. Special attention is paid to the statistical analysis. A standard frequency-of-serving curve is fitted to the observer data in order to obtain 75%- correct thresholds. A (chi) 2-statistic provides an objective criterion for acceptance or rejection of the threshold estimates. Finally, a complete TOD curve is obtained by fitting a weighted least-square polynomial through the 75%-correct thresholds. Further, a simple Go- NoGo screening procedure with objective pass/fail criteria, based on the TOD methodology, is proposed. With the TOD methodology, accurate sensor performance measured and Go- NoGo testing have become very easy to carry out. Therefore, the investment in a thoroughly design measurement setup will apply itself back easily.

Paper Details

Date Published: 12 July 1999
PDF: 12 pages
Proc. SPIE 3701, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing X, (12 July 1999); doi: 10.1117/12.352986
Show Author Affiliations
Piet Bijl, TNO Human Factors Research Institute (Netherlands)
J. Mathieu Valeton, TNO Human Factors Research Institute (Netherlands)


Published in SPIE Proceedings Vol. 3701:
Infrared Imaging Systems: Design, Analysis, Modeling, and Testing X
Gerald C. Holst, Editor(s)

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