Researching | Dimensionality Measurement of Weak Texture Hydraulic Components Based on Binocular Vision

Laser & Optoelectronics Progress, Volume. 57, Issue 18, 181511(2020)

Dimensionality Measurement of Weak Texture Hydraulic Components Based on Binocular Vision

Jingfa Lei^1,2,3, Wang Wei^1,2, Yongling Li^1,2、*, Miao Zhang^1,2, and Yu He^1,2

Author Affiliations

¹School of Mechanical and Electrical Engineering, Anhui Jianzhu University, Hefei, Anhui 230601, China

²Anhui Education Department Key Laboratory of Intelligent Manufacturing of Construction Machinery, Hefei, Anhui 230601, China

³Sichuan Provincial Key Laboratory of Process Equipment and Control, Zigong, Sichuan 643000, China

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Figures&Tables (13)

References (19)

Paper Information

Figures & Tables(13)

Fig. 1. Binocular stereo vision measurement principle

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Fig. 2. Camera calibration board under normal illumination

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Fig. 3. Principle of pixel matching. (a) Left image; (b) right image

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Fig. 4. Test flow chart of binocular stereo vision measurement system

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Fig. 5. Binocular infrared calibration

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Fig. 6. RGB camera calibration

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Fig. 7. Objects under visible light

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Fig. 8. Left-right diagram projected with random spots

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Fig. 9. Pseudo color diagram

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Fig. 10. Partial parameter diagram of point cloud measurement

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Table 1. Camera calibration results

Table 1. Camera calibration results

Calibrationparameter	Value
Left cameraintrinsicmatrix M₁	$[\begin{array}{l} 910.132 & 0 & 610.440 \\ 0 & 909.940 & 392.594 \\ 0 & 0 & 1 \end{array}]$
Right cameraintrinsicmatrix M₂	$[\begin{array}{l} 911.131 & 0 & 643.265 \\ 0 & 910.889 & 410.903 \\ 0 & 0 & 1 \end{array}]$
Rotationstructure matrix R	$[\begin{array}{l} 1 & 0.0001 & - 0.0012 \\ - 0.0001 & 1 & - 0.0042 \\ 0.0012 & 0.0042 & 1 \end{array}]$
Translationstructure matrix T	$[\begin{array}{l} - 5.99634 & - 8.81368 & - 3.13699 \end{array}]$

Table 2. Diameter dimensions of cylinder head of diaphragm pump
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Table 2. Diameter dimensions of cylinder head of diaphragm pump
Truevalue /mm Measuredvalue /mm Error /mm Relativeerror /%
180.00 179.72 -0.27 -0.15
180.83 +0.83 +0.46
181.18 +1.18 +0.65
180.62 +0.62 +0.34
180.73 +0.73 +0.40
182.41 +2.41 +1.33

Table 3. Bolt hole dimensions
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Table 3. Bolt hole dimensions
Truevalue /mm Measuredvalue /mm Error /mm Relativeerror /%
9.70 9.77 +0.07 +0.76
9.95 +0.25 +2.61
9.85 +0.15 +1.54
9.53 -0.16 -1.73
9.76 +0.06 +0.65
9.82 +0.12 +1.31

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Jingfa Lei, Wang Wei, Yongling Li, Miao Zhang, Yu He. Dimensionality Measurement of Weak Texture Hydraulic Components Based on Binocular Vision[J]. Laser & Optoelectronics Progress, 2020, 57(18): 181511

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Paper Information

Category: Machine Vision

Received: Mar. 25, 2020

Accepted: May. 20, 2020

Published Online: Sep. 2, 2020

The Author Email: Yongling Li (lyl1@mail.ustc.edu.cn)

DOI:10.3788/LOP57.181511

Topics

laser devices and laser physics

Lasers and Laser Optics

laser manufacturing

Instrumentation, Measurement and Metrology