Modified slanted-edge method for camera modulation transfer function measurement using nonuniform fast Fourier transform technique

Yaxuan Duan; Songbo Xu; Suochao Yuan; Yongquan Chen; Hongguang Li; Zhengshang Da; Limin Gao

doi:10.1117/1.OE.57.1.014103

9 January 2018 Modified slanted-edge method for camera modulation transfer function measurement using nonuniform fast Fourier transform technique

Yaxuan Duan, Songbo Xu, Suochao Yuan, Yongquan Chen, Hongguang Li, Zhengshang Da, Limin Gao

Author Affiliations +

Optical Engineering, Vol. 57, Issue 1, 014103 (January 2018). https://doi.org/10.1117/1.OE.57.1.014103

Abstract

ISO 12233 slanted-edge method experiences errors using fast Fourier transform (FFT) in the camera modulation transfer function (MTF) measurement due to tilt angle errors in the knife-edge resulting in nonuniform sampling of the edge spread function (ESF). In order to resolve this problem, a modified slanted-edge method using nonuniform fast Fourier transform (NUFFT) for camera MTF measurement is proposed. Theoretical simulations for images with noise at a different nonuniform sampling rate of ESF are performed using the proposed modified slanted-edge method. It is shown that the proposed method successfully eliminates the error due to the nonuniform sampling of the ESF. An experimental setup for camera MTF measurement is established to verify the accuracy of the proposed method. The experiment results show that under different nonuniform sampling rates of ESF, the proposed modified slanted-edge method has improved accuracy for the camera MTF measurement compared to the ISO 12233 slanted-edge method.

Citation Download Citation

Yaxuan Duan, Songbo Xu, Suochao Yuan, Yongquan Chen, Hongguang Li, Zhengshang Da, and Limin Gao "Modified slanted-edge method for camera modulation transfer function measurement using nonuniform fast Fourier transform technique," Optical Engineering 57(1), 014103 (9 January 2018). https://doi.org/10.1117/1.OE.57.1.014103

Received: 7 August 2017; Accepted: 19 December 2017; Published: 9 January 2018

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