T.A. Akimenko1,  E.V. Larkin2

1,2 Tula State University (Tula, Russia)

1 tantan72@mail.ru

Various technical, operational, and economic requirements for thermal imaging measuring devices define performance criteria for such devices, reflecting the informative properties of thermal images, as well as the technical parameters and characteristics of the equipment. Distortion significantly distorts a thermal image by shifting the image of a point source in the plane of the heat-sensitive elements relative to their theoretical position. The magnitude of this shift depends on the type of distortion and the projection distance from the intersection of the principal optical axis and the plane of the elements. To assess information loss due to distortion in the lens/thermal-electronic transducer pair of a thermal imaging measuring device, it is necessary to consider that the point sources of the thermal signal, each projected onto its own heat-sensitive element, should not interfere with each other. When assessing the magnitude of distortion, the shift of the point source image relative to its theoretical position is measured; i.e., it is necessary to evaluate the type of distortion, "pincushion" and "barrel" types. The location of a group of sources should be estimated using a set of statistics measuring the heat radiation intensity of an area object simulating a reference source. To estimate information loss due to distortion, where a point source is replaced by a rectangular area object whose location is determined by representative points, it is necessary to develop a methodology for determining information loss taking into account distortion across area objects. The results of this study can be used in testing thermal imaging devices.

Akimenko T.A.,  Larkin E.V.  Methodology for determining distortion for area objects // Information-measuring and Control Systems. 2026. V. 24. № 3. P. 76−81. DOI: https://doi.org/10.18127/j20700814-202603-08

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