1 October 1990 Easy focusing with a sweep frequency target
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Methods for focusing thermal imaging systems are discussed including visual inspection of resolution targets and edges, maximizing the system response to slits or periodic targets, maximizing the response at a particular spatial frequency, and maximizing the output of an edge detection algorithm. Visual inspection of a sweep frequency is found to be the most efficient method for determining focus in raster scanned systems.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Gerald C. Holst, Stephen W. McHugh, "Easy focusing with a sweep frequency target", Proc. SPIE 1309, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing, (1 October 1990); doi: 10.1117/12.21782; https://doi.org/10.1117/12.21782


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