A new method based on morphologic filter and ant colony algorithm to enhance centroid detection accuracy of Shack-Hartmann wavefront sensor

Yanyan Zhang; Mei Li; Changhui Rao

doi:10.1117/12.811873

2 February 2009 A new method based on morphologic filter and ant colony algorithm to enhance centroid detection accuracy of Shack-Hartmann wavefront sensor

Yanyan Zhang, Mei Li, Changhui Rao

Author Affiliations +

Proceedings Volume 7157, 2008 International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications; 71571J (2009) https://doi.org/10.1117/12.811873
Event: International Conference of Optical Instrument and Technology, 2008, Beijing, China

Abstract

Shack-Hartmann wavefront sensor (SHWFS) is widely used in adaptive optics systems. Its centroid detecting error is one of the main error sources in adaptive optical systems. There are many factors affecting the detecting accuracy such as photon shot noise, readout noise, background level of CCD camera and number of detecting pixels. It is very effective to enhance the centroid accuracy by setting the threshold for the images of the SHWFS. But in daytime, the sky background is strong and changes very fast. The threshold cannot be chosen automatically either. In this paper, a new method based on the morphologic filter and ant colony algorithm is proposed to improve the SHWFS centroid detecting accuracy. The principle of the morphologic filter and the ant colony algorithm is introduced and the simulation results are also presented. The results show the proposed method can enhance SHWFS centroid accuracy very well.

Citation Download Citation

Yanyan Zhang, Mei Li, and Changhui Rao "A new method based on morphologic filter and ant colony algorithm to enhance centroid detection accuracy of Shack-Hartmann wavefront sensor", Proc. SPIE 7157, 2008 International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications, 71571J (2 February 2009); https://doi.org/10.1117/12.811873

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