Fast Center Extraction Algorithm for Line Structured Laser Stripe of Antiwelding Slag Spatter

Zeng Hu; Weiming Li; Housein Alaa Aldeen; Xingyu Gao; Bingqiang Yin; Chuannen Wei

doi:10.3788/LOP202259.1611011

Laser & Optoelectronics Progress, Volume. 59, Issue 16, 1611011(2022)

Fast Center Extraction Algorithm for Line Structured Laser Stripe of Antiwelding Slag Spatter

Zeng Hu, Weiming Li, Housein Alaa Aldeen, Xingyu Gao^*, Bingqiang Yin, and Chuannen Wei

Guangxi Key Laboratory of Manufacturing Systems and Advanced Manufacturing Technology, School of Mechanical and Electrical Engineering, Guilin University of Electronic Technology, Guilin 541004, Guangxi , China

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Figures & Tables(10)

Fig. 1. Mechanical structure of line structured light sensor and image sample. (a) Mechanical structure of sensor; (b) image captured by sensor

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Fig. 2. Principle of strip geometric center extraction

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Fig. 3. Principle of connected domain extraction for strip center contour

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Fig. 4. Result of edge linking. (a) Extracted geometric center of stripe; (b) image after edge linking; (c) enlarged view of Fig. 4(a) ;(d) enlarged view of Fig. 4(b)

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Fig. 5. Simulation image. (a) Simulated image with artificial stripes; (b) labeled stripe center

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Fig. 6. Directed graph created by ordered pairs

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Fig. 7. Results of center extraction and reconstruction. (a) Extracted stripe center of weld seam; (b) extracted stripe center of weld bead; (c) reconstructed cloud point of weld bead

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Table 1. List of ordered pairs
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Table 1. List of ordered pairs
Type of contours List
Ordered pair <1，2> <2，3> <4，5> <7，8> <7，11> <8，9> <8，12> <11，9> <11，12> <9，10>
Independent contour 6

Table 2. Comparison results of line fitting error and running time
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Table 2. Comparison results of line fitting error and running time
Method Fitting error /pixel Running time /ms
Weighted gray-gravity method 0.2272 4.200
Steger method 0.2465 89.340
Improved Gaussian fitting method 0.2302 11.595
Proposed method 0.2238 3.570

Table 3. Parameter values of proposed algorithm

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Table 3. Parameter values of proposed algorithm

Parameter	Value
Threshold value of gray-scale image $T_{g}$	200
High threshold value of stripe width $T_{H}$ /pixel	30
Low threshold value of stripe width $T_{L}$ /pixel	5
Threshold value of connected domain $T_{c}$	9
Distance threshold value of edge linking $d$ /pixel	40
Angle threshold value of edge linking $θ$ /rad	$\frac{π}{6}$
Threshold value of ordered pair $T_{p}$ /pixel	30

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Zeng Hu, Weiming Li, Housein Alaa Aldeen, Xingyu Gao, Bingqiang Yin, Chuannen Wei. Fast Center Extraction Algorithm for Line Structured Laser Stripe of Antiwelding Slag Spatter[J]. Laser & Optoelectronics Progress, 2022, 59(16): 1611011

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