Development and Validation of a Second Generation Visibility-Based Model for Predicting Subjective and Objective Minimum Resolvable Temperature Difference Performance for Staring Thermal Imaging Systems.
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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Several models have been proposed to predict the minimum resolvable temperature difference MRTD performance of second generation thermal imaging systems TIS which incorporate staring focal plane arrays. It has been suggested that these models are not accurate for predicting the performance of second generation staring focal plane arrays which have severe phasing or sampling characteristics not amenable to linear modulation transfer function analysis. A second problem with these models is that they require a particular set of assumptions concerning the observer eyebrain recognition process, limiting their usefulness in the prediction of performance for systems that incorporate automatic target recognition ATR devices. In this thesis, a new model is presented for predicting the MRTD performance of second generation thermal imagers based on a minimum threshold input contrast, and a contrast reduction factor due to aliasing and blurring effects. The model makes no assumptions regarding the recognition process, which allows a separate threshold value to be defined for either a human or machine observer. The model incorporates aliasing concepts, and extends performance prediction beyond the nominal Nyquist rate of the system. The models predictions are compared to the predictions of the current standard FUR92 model and measured laboratory results for two different staring focal plane array imagers. In both cases, the modelss predictions match measured results more closely than the predictions of FLIR92.
- Human Factors Engineering and Man Machine Systems
- Infrared Detection and Detectors