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Optical Engineering • new

Modified slanted-edge method for camera modulation transfer function measurement using nonuniform fast Fourier transform technique
Author(s): Yaxuan Duan; Songbo Xu; Suochao Yuan; Yongquan Chen; Hongguang Li; Zhengshang Da; Limin Gao
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Paper 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.

Paper Details

Date Published: 9 January 2018
PDF: 10 pages
Opt. Eng. 57(1) 014103 doi: 10.1117/1.OE.57.1.014103
Published in: Optical Engineering Volume 57, Issue 1
Show Author Affiliations
Yaxuan Duan, Xi'an Institute of Optics and Precision Mechanics, CAS (China)
Univ. of Chinese Academy of Sciences (China)
Songbo Xu, Xi'an Institute of Optics and Precision Mechanics, CAS (China)
Suochao Yuan, Xi'an Institute of Optics and Precision Mechanics, CAS (China)
Univ. of Chinese Academy of Sciences (China)
Yongquan Chen, Xi'an Institute of Optics and Precision Mechanics, CAS (China)
Hongguang Li, Xi'an Institute of Optics and Precision Mechanics, CAS (China)
Zhengshang Da, Xi'an Institute of Optics and Precision Mechanics, CAS (China)
Limin Gao, Xi'an Institute of Optics and Precision Mechanics, CAS (China)


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