In recent years, sinusoidal Siemens stars have been widely used as a method of measuring spatial frequency response (SFR). Previous researches pointed out that incorrect recognition of the Siemens star center could result in errors in SFR measurement, and these errors are more significant at high frequencies. To reduce the errors, this paper proposed two methods to correct the center of Siemens star. By calibrating various Siemens star centers with the proposed methods, it is found that both the two methods are highly consistent, with a difference of no more than 2 pixels.
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