Correcting the effect of temperature on image quality of thermal imaging objectives by wavefront coding technique
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https://doi.org/10.54939/1859-1043.j.mst.83.2022.48-58Keywords:
Thermal objective; Defocus; Restored algorithm.Abstract
The paper has proposed a method for correcting the effect of temperature on the imaging quality of thermal imaging systems by wavefront coding technology. A cubic phase mask was added to the aperture diaphragm of the thermal imaging objective to obtain a temperature-invariant point spread function (PSF). The received images will be of low quality but almost invariant with the change in temperature. An inverse filter was used to recover high-quality images over a variable temperature range. To demonstrate the effectiveness of the proposed method, a thermal imaging objective was used to experiment. The simulation results demonstrate that the proposed method can effectively eliminate the temperature influence on the image quality of the thermal imaging objective.
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