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Video imagers operating in the thermal infra-red part of the electro- magnetic spectrum have many different characteristics to those operating in the visible part of the spectrum. In particular, the highest performance thermal imagers incorporate a scanning mechanism which gives rise to a unique geometry. This paper outlines the main characteristics of thermal video frame scanners and gives an account of the methods devised and implemented by the authors to carry out the geometric calibration of these scanners. The results obtained from the calibration of seven frame scanners from different manufacturers are given. Analysis of these results shows that specific polynomial transformations can be derived and used successfully to remove the effects of the geometric distortions present in the video images obtained from thermal frame scanners.
Ahmed Mohamed Amin andGordon Petrie
"Geometric calibration of thermal video frame scanners", Proc. SPIE 2067, Videometrics II, (22 October 1993); https://doi.org/10.1117/12.162135
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Ahmed Mohamed Amin, Gordon Petrie, "Geometric calibration of thermal video frame scanners," Proc. SPIE 2067, Videometrics II, (22 October 1993); https://doi.org/10.1117/12.162135