Application of Spot Quality Evaluation in Subgrade Settlement Monitoring and Measurement System

Fig. 5. Laser spot image collection results. (a) Spot image when the target surface is 20 m away from the laser; (b) spot image when the target surface is 25 m away from the laser; (c) spot image when the target surface is 30 m away from the laser; (d) spot image when the target surface is 35 m away from the laser; (e) spot image when the target surface is 40 m away from the laser; (f) spot image when the target surface is 45 m away from the laser; (g) spot image when the target surface is 50 m away from the laser

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Fig. 6. Changes of spot quality parameters with positioning errors. (a) Relationship between edge definition and positioning error; (b) relationship between relative brightness and positioning error; (c) relationship between image information entropy and positioning error; (d) relationship between vertical state of light and positioning error

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Fig. 7. Reliability experiment process diagram of quality evaluation algorithm

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Fig. 8. Process of image quality score change

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Fig. 9. On-site installation of subgrade surface settlement monitoring system

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Fig. 10. Changing process of image quality score and positioning error

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Table 1. Random consensus index
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Table 1. Random consensus index
m 1 2 3 4 5 6
R 0 0 0.58 0.90 1.12 1.24

Table 2. Experimental results of adding noise to the 4^th spot image

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Table 2. Experimental results of adding noise to the 4^th spot image

Experiment number	$I_{S}$	$L_{r e}$	$H (G)$	$S_{L}$	$(x_{4 n}, y_{4 n})$	$(x_{40}, y_{40})$	$Δ$
E41	5.3520	0.8959	5.1080	0.9178	（476.95，672.66）	（477.87，672.82）	0.9338
E42	5.1779	0.8673	5.1756	0.9171	（475.24，672.80）	（477.87，672.82）	2.6300
E43	5.2232	0.8678	5.1914	0.9112	（476.01，672.73）	（477.87，672.82）	1.8621
E44	5.2509	0.8918	5.1684	0.9235	（476.28，672.35）	（477.87，672.82）	1.6580
E45	5.1538	0.8717	5.2081	0.9090	（475.06，672.62）	（477.87，672.82）	2.8171
E46	5.3181	0.9008	5.0190	0.9161	（476.50，672.81）	（477.87，672.82）	1.3700
E47	5.1492	0.8591	5.2332	0.9115	（475.04，672.72）	（477.87，672.82）	2.8317

Table 3. Conversion rules from 9/9-9/1 scale to 1-9 scale
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Table 3. Conversion rules from 9/9-9/1 scale to 1-9 scale
1-9 scale 1 2 3 4 5 6 7 8 9
9/9-9/1 scale 1.000 1.125 1.286 1.500 1.800 2.250 3.000 4.500 9.000

Table 4. Image quality score of light spots
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Table 4. Image quality score of light spots
Experiment number E41 E46 E44 E43 E42 E45 E47
Positioning error 0.9338 1.3700 1.6580 1.8621 2.6300 2.8171 2.8317
Score 0.9821 0.9838 0.9725 0.9650 0.9583 0.9491 0.9442

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Yongzhi Min, Tianfang Sun. Application of Spot Quality Evaluation in Subgrade Settlement Monitoring and Measurement System[J]. Laser & Optoelectronics Progress, 2023, 60(4): 0415003

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