Research on Spot Center Localization Algorithm in Atmospheric Turbulence Environment

Pengfei WU; Huiliang WANG; Sichen LEI; Shuai DANG

doi:10.3788/gzxb20225103.0301002

Acta Photonica Sinica, Volume. 51, Issue 3, 0301002(2022)

Research on Spot Center Localization Algorithm in Atmospheric Turbulence Environment

Pengfei WU1,*... Huiliang WANG1, Sichen LEI1 and Shuai DANG2 |Show fewer author(s)

Author Affiliations

¹School of Automation & Information Engineering，Xi'an University of Technology，Xi'an 710048，China

²School of International Engineering，Xi'an University of Technology，Xi'an 710054，China

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Abstract Get PDF(in Chinese)

Figures & Tables(19)

Fig. 1. Principles of image detection algorithm flow chart

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Fig. 2. Diagram of spot sliding compensation positioning

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Fig. 3. Phase screen simulation of atmospheric turbulence

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Fig. 4. Simulate the spot of Gaussian beam passing through the turbulent phase screen of different intensities

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Fig. 5. Positioning spacing between four algorithms in different intensity Gaussian noise

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Fig. 6. Pixel intensity of spot image mask based on four positioning algorithms under different intensity gaussian noise

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Fig. 7. Laser communication link

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Fig. 8. 10.2 km communication link

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Fig. 9. 2.4 km communication link

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Fig. 10. Actual spot image captured in 10.2 km experiment

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Fig. 11. Intensity of the pixels in mask from 10.2 km spot image under different algorithms

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Fig. 12. Location distance between 10.2 km spot images based on different algorithms

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Fig. 13. Actual spot image captured in 2.4 km experiment

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Fig. 14. Intensity of the pixels in mask from 2.4 km spot image under different algorithms

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Fig. 15. Location distance between 2.4 km spot images based on different algorithms

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Table 1. Offsets of registration point from standard center under different algorithms/pixel

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Table 1. Offsets of registration point from standard center under different algorithms/pixel

Mode adaptive

threshold method

Adaptive

threshold method

Maximization of

interclass

variance method

Iterative method

Nonlinear weighted Barycenter algorithm

0.000 969 9

0.006 642

0.002 017

Barycenter algorithm

0.005 225

0.010 74

0.005 002

Table 2. Effect analysis of spot processing
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Table 2. Effect analysis of spot processing
2.4 km spot image 10.2 km spot image
MSE PSNR MSE PSNR
Operation 1 2.915 3 43.484 0 0.159 4 56.105 1
Operation 2 2.897 3 43.510 9 0.142 7 56.586 7

Table 3. Effect analysis of 10.2 km spot processing

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Table 3. Effect analysis of 10.2 km spot processing

	Step-length L/pixel		Pixel intensity/pixel R=30		Pixel intensity/pixel R=60
	Average value	Standard deviation	Average value	Standard deviation	Average value	Standard deviation
Sliding weighted Barycenter algorithm	22.75	12.78	4.247 $\times$ 10⁵	5.928 $\times$ 10⁴	1.328 $\times$ 10⁵	1.651 $\times$ 10⁵
Nonlinear weighted Barycenter algorithm	25.24	13.50	4.253 $\times$ 10⁵	5.975 $\times$ 10⁴	1.328 $\times$ 10⁵	1.646 $\times$ 10⁵
Barycenter algorithm	24.59	12.71	4.12 $\times$ 10⁵	6.366 $\times$ 10⁴	1.316 $\times$ 10⁵	1.631 $\times$ 10⁵
Centroid algorithm	25.77	12.73	3.96 $\times$ 10⁵	6.662 $\times$ 10⁴	1.291 $\times$ 10⁵	1.627 $\times$ 10⁵

Table 4. Effect analysis of 2.4 km spot processing

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Table 4. Effect analysis of 2.4 km spot processing

	Step-length L/pixel		Pixel intensity/pixel R=30		Pixel intensity/pixel R=60
	Average value	Standard deviation	Average value	Standard deviation	Average value	Standard deviation
Sliding weighted Barycenter algorithm	57.00	35.99	3.269 $\times$ 10⁶	7.235 $\times$ 10⁵	4.642 $\times$ 10⁶	9.155 $\times$ 10⁵
Nonlinear weighted Barycenter algorithm	63.19	38.98	3.3 $\times$ 10⁶	7.243 $\times$ 10⁵	4.657 $\times$ 10⁶	9.137 $\times$ 10⁵
Barycenter algorithm	60.31	37.56	3.057 $\times$ 10⁶	7.24 $\times$ 10⁵	4.446 $\times$ 10⁶	9.177 $\times$ 10⁵
Centroid algorithm	63.77	36.52	2.807 $\times$ 10⁶	8.012 $\times$ 10⁵	4.212 $\times$ 10⁶	9.93 $\times$ 10⁵

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Pengfei WU, Huiliang WANG, Sichen LEI, Shuai DANG. Research on Spot Center Localization Algorithm in Atmospheric Turbulence Environment[J]. Acta Photonica Sinica, 2022, 51(3): 0301002

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