TOD versus MRT when evaluating thermal imagers that exhibit dynamic performance

Joseph Kostrzewa; John Long; John H. Graff; John David Vincent

doi:10.1117/12.485987

22 August 2003 TOD versus MRT when evaluating thermal imagers that exhibit dynamic performance

Joseph Kostrzewa, John Long, John H. Graff, John David Vincent

Proceedings Volume 5076, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XIV; (2003) https://doi.org/10.1117/12.485987
Event: AeroSense 2003, 2003, Orlando, Florida, United States

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.

Citation Download Citation

Joseph Kostrzewa, John Long, John H. Graff, and John David Vincent "TOD versus MRT when evaluating thermal imagers that exhibit dynamic performance", Proc. SPIE 5076, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XIV, (22 August 2003); https://doi.org/10.1117/12.485987

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