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Proceedings Paper

An improved sub-pixel algorithm for laser spot center determination based on Zernike moments
Author(s): Kun Zhang; Hai-qing Chen; Jun Li; Jia-kun Xu
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Paper Abstract

The laser spot determination is the critical technique in laser detecting systems. Due to atmospheric turbulence and other factors, the laser spot intensity distributes unevenly in the long-distance measurement. In order to improve the location precision of the laser spot detection, an improved sub-pixel algorithm based on Zernike moments is presented in this paper with theoretical analysis. The experimental results of the proposed algorithm with CCD image test are also given and compared with that of four conventional algorithms including gravity model, Hough transform, circle fitting, and spatial moment operators. The comparative results demonstrate that the improved algorithm based on Zernike moments has the virtue of higher measuring precision. The stability and interference suppression ability are also improved. The proposed algorithm has already been applied into the processing of our laser detecting system, which can also play an important role in automatic recognition, etc.

Paper Details

Date Published: 31 August 2009
PDF: 8 pages
Proc. SPIE 7382, International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging, 738244 (31 August 2009); doi: 10.1117/12.836667
Show Author Affiliations
Kun Zhang, Huazhong Univ. of Science and Technology (China)
Hai-qing Chen, Huazhong Univ. of Science and Technology (China)
Jun Li, Huazhong Univ. of Science and Technology (China)
Jia-kun Xu, Huazhong Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 7382:
International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging
Farzin Amzajerdian; Chun-qing Gao; Tian-yu Xie, Editor(s)

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