Imaging Components, Systems, and Processing

Hough transform used on the spot-centroiding algorithm for the Shack–Hartmann wavefront sensor

[+] Author Affiliations
Chou-Min Chia, Kuang-Yuh Huang

National Taiwan University, Department of Mechanical Engineering, 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan

Elmer Chang

Genius Electronic Optical Co., Central Taiwan Science Park No. 1, Keya E. Road, Daya District, Taichung 42882, Taiwan

Opt. Eng. 55(1), 013105 (Jan 22, 2016). doi:10.1117/1.OE.55.1.013105
History: Received June 29, 2015; Accepted December 10, 2015
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Abstract.  An approach to the spot-centroiding algorithm for the Shack–Hartmann wavefront sensor (SHWS) is presented. The SHWS has a common problem, in that while measuring high-order wavefront distortion, the spots may exceed each of the subapertures, which are used to restrict the displacement of spots. This artificial restriction may limit the dynamic range of the SHWS. When using the SHWS to measure adaptive optics or aspheric lenses, the accuracy of the traditional spot-centroiding algorithm may be uncertain because the spots leave or cross the confined area of the subapertures. The proposed algorithm combines the Hough transform with an artificial neural network, which requires no confined subapertures, to increase the dynamic range of the SHWS. This algorithm is then explored in comprehensive simulations and the results are compared with those of the existing algorithm.

© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Chou-Min Chia ; Kuang-Yuh Huang and Elmer Chang
"Hough transform used on the spot-centroiding algorithm for the Shack–Hartmann wavefront sensor", Opt. Eng. 55(1), 013105 (Jan 22, 2016). ; http://dx.doi.org/10.1117/1.OE.55.1.013105


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