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Optical Engineering

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

Paper Details

Date Published: 22 January 2016
PDF: 9 pages
Opt. Eng. 55(1) 013105 doi: 10.1117/1.OE.55.1.013105
Published in: Optical Engineering Volume 55, Issue 1
Show Author Affiliations
Chou-Min Chia, National Taiwan Univ. (Taiwan)
Kuang-Yuh Huang, National Taiwan Univ. (Taiwan)
Elmer Chang, Genius Electronic Optical Co., Ltd. (Taiwan)


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