Algorithm of far-field centre estimation based on phase-only matched filter

doi:10.1088/1674-1056/18/1/035

Abstract

Abstract Estimation of the far-field centre is carried out in beam auto-alignment. In this paper, the features of the far-field of a square beam are presented. Based on these features, a phase-only matched filter is designed, and the algorithm of centre estimation is developed. Using the simulated images with different kinds of noise and the 40 test images that are taken in sequence, the accuracy of this algorithm is estimated. Results show that the error is no more than one pixel for simulated noise images with a 99% probability, and the stability is restricted within one pixel for test images. Using the improved algorithm, the consumed time is reduced to 0.049s.

Keywords: beam auto-alignment far-field image process phase-only matched filter

Received: 02 June 2008
Revised: 22 August 2008
Accepted manuscript online:

PACS:	42.79.Ci	(Filters, zone plates, and polarizers)
	42.30.Kq	(Fourier optics)
	42.30.Va	(Image forming and processing)

Fund: Project supported by the National High Technology Research and Development Program of China (Grant No 007SQ804) and Japan--Korea--China Cooperative Project on High Energy Density Science for Laser Fusion Energy.

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Gao Yan-Qi(高妍琦), Zhu Bao-Qiang(朱宝强), Liu Dai-Zhong(刘代中), Liu Xiao-Feng(刘晓凤), and Lin Zun-Qi(林尊琪) Algorithm of far-field centre estimation based on phase-only matched filter 2009 Chin. Phys. B 18 215

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Algorithm of far-field centre estimation based on phase-only matched filter

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