• Title/Summary/Keyword: Presampled 변조전달함수

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Study of MTF Measure That Adopts a Fitting Curve for the Variable Angle of a Slant Target in Presampled MTF (Presampled MTF 기법에서 Slant Target의 다양한 각도에 대한 함수 Fitting이 적용된 MTF 측정기법에 관한 연구)

  • Choi, Siyoun;Kim, Junghwan;Kong, Hyunbae;Kim, Donghwan;Baek, Kyounghoon;Park, Ingu;Jeon, Hyowon;Lee, Kinam
    • Korean Journal of Optics and Photonics
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    • v.33 no.6
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    • pp.310-316
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    • 2022
  • In this paper, the difference in modulation transfer function (MTF) results according to the change in the angle of a slant target when measuring a presampled MTF was confirmed, and the difference was reduced by fitting the edge spread function graph obtained to reduce the error by the target's rotation. Due to the feature of the presampled MTF method, the spatial frequency changed due to the sensor's projected intensity being changed by the target's rotation, and it was confirmed that the difference in the MTF value occurred depending on the rotation angle of the target. In this paper, the MTF was calculated after fitting only one column of the acquired image. It was confirmed that the rotation error is smaller compared to the case of the presampled MTF method and this fitting method can be applied to a scene that contains various target angles, such as auto-focusing using the MTF.