Calculating the modulation transfer function of an optical imaging system incorporating a digital camera from slanted-edge images captured under variable illumination levels: Fourier transforms application using MATLAB

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• 作者：Sami D. Alaruri ^{sami_laser@yahoo.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Modulation transfer function (MTF) ; Line spread function (LSF) ; Point spread function (PSF) ; Optical transfer function (OTF) ; ImageJ ; Collimator
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：127
• 期：15
• 页码：5820-5824
• 全文大小：1037 K

文摘

In this paper, a method for evaluating the modulation transfer function (MTF) of an optical system from the image of a slanted-edge target projected using an off-axis Newtonian collimator and recorded using a digital camera is presented. Mathematical derivation for the MTF function in terms of the line spread function employing Fourier transforms and convolution theory is provided. Furthermore, MATLAB^® script for calculating the MTF plot from the captured slanted-edge images is given. As an illustration, MTF plots computed for slanted-edge images captured under 100, 500 and 1000 lx illumination levels are discussed.