Work has been conducted to compare the results of the sinusoidal Siemens star measurement to other techniques, such as edge-spread function measurements, 2, 3 and the Siemens star target has been implemented as a useful test methodology in numerous applications for SFR measurements. Modifications to the ISO 12233 photography resolution standard 1 in February, 2014, now include a sinusoidal Siemens star as an approved test target. Measuring the spatial frequency response (SFR) of an optical system remains an intricate task, with several test methodologies available to the optical scientist and engineer, including slanted edge tests and measurements from known noise targets.
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