Extracting Method for Light Strip Center of Linear Structural Light Based on Dual Frequency Curve Fitting

Qinghua Wu; Yang Zhou; Ziqi Li; Qiongjiesi Cai; Cai Wan

doi:10.3788/LOP57.141502

Laser & Optoelectronics Progress, Volume. 57, Issue 14, 141502(2020)

Extracting Method for Light Strip Center of Linear Structural Light Based on Dual Frequency Curve Fitting

Qinghua Wu^1,2、*, Yang Zhou^1,2, Ziqi Li^1,2, Qiongjiesi Cai^1,2, and Cai Wan^1,2

Author Affiliations

¹School of Mechanical Engineering, Hubei University of Technology, Wuhan, Hubei 430068, China

²Key Laboratory of Modern Manufacture and Quality Engineering of Hubei Province, Wuhan, Hubei 430068, China

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Figures & Tables(11)

Fig. 1. Light intensity gray value in the normal direction of the light stripe. (a) Gray value; (b) spectrogram

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Fig. 2. Angle classification diagram of fitting straight line

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Fig. 3. Light stripe normal direction extracting result of linear structural light

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Fig. 4. Results of light strip center extraction

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Fig. 5. Fitting results of various methods

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Fig. 6. Images of linear laser strips for different materials. (a) Board; (b) rubber; (c) paper board; (d) copper pipe; (e) ceramic cover; (f) rust iron

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Fig. 7. Light streaks on the surface of copper tube taken at different exposure time. (a) 700 μs; (b) 4700 μs; (c) 9200 μs; (d) 17200 μs

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Fig. 8. RMSE of light fringe center position for three extraction methods under different exposure time

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Table 1. Evaluation of the results of four fitting curves

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Table 1. Evaluation of the results of four fitting curves

Fitting method	SSE	RMSE	R-square	Adj R-sg	Peak Position/pixel
Gaussian curve	9514.1	27.0528	0.9438	0.9352	635.2000
Single frequency curve	62124.0	69.1286	0.6331	0.5767	634.9789
Dual frequency curve	8638.3	29.3910	0.9490	0.9235	635.1573
Three frequency curve	7262.8	32.2110	0.9571	0.9081	635.4525

Table 2. Results of stripe center extraction

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Table 2. Results of stripe center extraction

Extraction method	Average center position /pixel	RMSE /pixel	Average processing time /s
Steger method	479.428	0.291	13.905
Double frequency curve fitting	479.267	0.382	0.534
Gaussian curve fitting	479.183	0.458	1.155

Table 3. Results of stripe center extraction for different materials

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Table 3. Results of stripe center extraction for different materials

Serialnumber	Material	Central mean position /pixel			RMSE /pixel
Serialnumber	Material	Double frequency	Gaussian	Steger	Double frequency	Gaussian	Steger
1	board	366.7903	366.8162	366.9250	0.0080	0.0101	0.0032
2	rubber	462.1439	462.0366	462.0482	0.0090	0.0092	0.0029
3	paper board	521.4027	521.3555	521.6177	0.0075	0.0087	0.0033
4	copper pipe	415.4636	415.4884	415.5580	0.0079	0.0079	0.0049
5	ceramic cover	437.2967	437.1962	437.2102	0.0084	0.0063	0.0044
6	rust iron	366.3628	366.2859	366.4073	0.0071	0.0093	0.0023

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Qinghua Wu, Yang Zhou, Ziqi Li, Qiongjiesi Cai, Cai Wan. Extracting Method for Light Strip Center of Linear Structural Light Based on Dual Frequency Curve Fitting[J]. Laser & Optoelectronics Progress, 2020, 57(14): 141502

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Paper Information

Category: Machine Vision

Received: Nov. 20, 2019

Accepted: Dec. 5, 2019

Published Online: Jul. 28, 2020

The Author Email: Qinghua Wu (kinghuawu@sohu.com)

DOI:10.3788/LOP57.141502

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology