High-Precision Line Laser Three-Dimensional Measurement Method Based on Telecentric Imaging

Yayun Meng; Huiwen Deng; Guofeng Zhang; Lingyu Ge; Kailiang Lin; Shuming Yang

doi:10.3788/LOP222677

Laser & Optoelectronics Progress, Volume. 60, Issue 3, 0312022(2023)

High-Precision Line Laser Three-Dimensional Measurement Method Based on Telecentric Imaging

Yayun Meng, Huiwen Deng, Guofeng Zhang, Lingyu Ge, Kailiang Lin, and Shuming Yang^*

Author Affiliations

State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University,Xi'an 710049, Shaanxi, China

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Figures & Tables(14)

Fig. 1. Schematic diagram of line laser measurement system for telecentric imaging

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Fig. 2. Schematic diagram of telecentric lens imaging optical path

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Fig. 3. Camera imaging model with bilateral telecentric lens

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Fig. 4. Diagram of position relation of laser plane, projection plane and calibration plane

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Fig. 5. Measuring platform

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Fig. 6. Camera calibration images

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Fig. 7. Images in a certain pose. (a) Calibration plate image without laser projection; (b) laser stripe image without lighting source

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Fig. 8. Laser stripe and light plane fitting

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Fig. 9. Gauge block. (a) Physical map; (b) point cloud map

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Fig. 10. Sample reconstruction results. (a) Physical drawing of industrial part; (b) industrial part 3D reconstruction result; (c) physical drawing of ceramic model; (b) ceramic model 3D reconstruction result

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Table 1. Telecentric camera calibration results
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Table 1. Telecentric camera calibration results
Magnification Distortion k₁（×10^-7） Distortion k₂（×10^-10） Reprojection error /pixel
0.199719 4.26091 －2.52496 0.271447

Table 2. Telecentric camera calibration results

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Table 2. Telecentric camera calibration results

Point No.	Laser line direction vector
1	［0.181871，0.982846，-0.014553］^T
2	［0.189028，0.977347，-0.024117］^T
3	［0.188845，0.977098，-0.023485］^T
4	［0.188770，0.980917，-0.018678］^T
5	［0.169291，0.980011，-0.022408］^T
6	［0.139874，0.986097，-0.089592］^T
7	［0.173615，0.982375，0.005284］^T
8	［0.166604，0.977990，-0.027501］^T
9	［0.207611，0.972565，-0.072362］^T
10	［0.222349，0.969022，-0.107222］^T
11	［0.2253088，0.947963，-0.120007］^T
12	［0.251250，0.947922，-0.183600］^T
13	［0.182562，0.979764，-0.016613］^T

Table 3. Measurement results of standard gauge block
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Table 3. Measurement results of standard gauge block
Measured region /mm×mm Standard value /mm Measured value /mm Accuracy /mm
64×48.2 1 0.982 0.018

Table 4. Comparison with other methods

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Table 4. Comparison with other methods

Method	Equipment	Measured region /mm×mm	Accuracy /mm	Frame rate /（frame·s^-1）
Yang^［5］	pinhole camera，line laser projector	120×90	0.090	15
Zhang^［19］	two telecentric cameras	21×17	0.020	15
Shi^［20］	telecentric camera，digital projector	18×16	0.011	20

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Yayun Meng, Huiwen Deng, Guofeng Zhang, Lingyu Ge, Kailiang Lin, Shuming Yang. High-Precision Line Laser Three-Dimensional Measurement Method Based on Telecentric Imaging[J]. Laser & Optoelectronics Progress, 2023, 60(3): 0312022

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