20 February 2018 Optimum parameters of image preprocessing method for Shack-Hartmann wavefront sensor in different SNR condition
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Abstract
The centroid method is commonly adopted to locate the spot in the sub-apertures in the Shack-Hartmann wavefront sensor (SH-WFS), in which preprocessing image is required before calculating the spot location due to that the centroid method is extremely sensitive to noises. In this paper, the SH-WFS image was simulated according to the characteristics of the noises, background and intensity distribution. The Optimal parameters of SH-WFS image preprocessing method were put forward, in different signal-to-noise ratio (SNR) conditions, where the wavefront reconstruction error was considered as the evaluation index. Two methods of image preprocessing, thresholding method and windowing combing with thresholding method, were compared by studying the applicable range of SNR and analyzing the stability of the two methods, respectively.
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Ping Wei, Ping Wei, Xinyang Li, Xinyang Li, Xi Luo, Xi Luo, Jianfeng Li, Jianfeng Li, } "Optimum parameters of image preprocessing method for Shack-Hartmann wavefront sensor in different SNR condition", Proc. SPIE 10697, Fourth Seminar on Novel Optoelectronic Detection Technology and Application, 1069742 (20 February 2018); doi: 10.1117/12.2315582; https://doi.org/10.1117/12.2315582
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