Gradient cross-correlation algorithm for scene-based Shack-Hartmann wavefront sensing

Scene-based wavefront sensing currently uses the periodic-correlation algorithm based on fast Fourier transforms. However, when the object scene contains features at the field edges, the performance of the algorithm is poor due to the periodicity of fast Fourier transforms, called wraparound effect....

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Bibliographic Details
Published in:Optics express 2018-06, Vol.26 (13), p.17549-17562
Main Authors: Wang, Y, Chen, X, Cao, Z, Zhang, X, Liu, C, Mu, Q
Format: Article
Language:English
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Summary:Scene-based wavefront sensing currently uses the periodic-correlation algorithm based on fast Fourier transforms. However, when the object scene contains features at the field edges, the performance of the algorithm is poor due to the periodicity of fast Fourier transforms, called wraparound effect. In this paper, we propose an algorithm based on the gradient cross-correlation. Both simulation and experiment results show its dramatic effectiveness against the wraparound effect, and a considerable improvement is obtained in image resolution with closed loop adaptive optics correction.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.26.017549