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Proceedings Paper

TOD versus MRT when evaluating thermal imagers that exhibit dynamic performance
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Paper Abstract

While it is universally recognized that image quality of a thermal sensor is a strong function of spatial uniformity, the metrics commonly used to assess performance do not adequately measure the effectiveness of non-uniformity correction (NUC). Image uniformity is generally not static, particularly if correction terms are updated intermittently (with periodic shuttering) or gradually (with scene-based NUC). Minimum Resolvable Temperature (MRT), the most prevalent test for characterizing overall imaging performance, is poorly suited for characterizing dynamic performance. The Triangle Orientation Discrimination (TOD) metric proposed by Bijl and Valeton, because of its short observation window, provides better capability for evaluating sensors that exhibit non-negligible uniformity drift. This paper compares the effectiveness of MRT and TOD for measuring dynamic performance. TOD measurements of a shutter-based thermal imager are provided immediately after shutter correction and 3 minutes later. The drift in TOD performance shows excellent correlation to drift in system noise.

Paper Details

Date Published: 22 August 2003
PDF: 13 pages
Proc. SPIE 5076, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XIV, (22 August 2003); doi: 10.1117/12.485987
Show Author Affiliations
Joseph Kostrzewa, Indigo Systems Corp. (United States)
John Long, Indigo Systems Corp. (United States)
John H. Graff, Indigo Systems Corp. (United States)
John David Vincent, Indigo Systems Corp. (United States)

Published in SPIE Proceedings Vol. 5076:
Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XIV
Gerald C. Holst, Editor(s)

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