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Laser & Optoelectronics Progress, Volume. 56, Issue 22, 221505(2019)

Efficient Calibration Method for Line-Structured Light Vision Measurement System

Aijuan Li, Rui Xin, and Shuanhu Wu*
Author Affiliations
  • School of Computer and Control Engineering, Yantai University, Yantai, Shandong 264005, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (7)
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    References (11)
    Cited By (7)
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    Figures & Tables(7)
    Working principle of measuring system

    Fig. 1. Working principle of measuring system

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    Schematic of cross-ratio invariant principle

    Fig. 2. Schematic of cross-ratio invariant principle

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    Schematic of plane projection of homography matrix

    Fig. 3. Schematic of plane projection of homography matrix

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    Schematic of calibration operation

    Fig. 4. Schematic of calibration operation

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    Schematic of light strip line pre-processing. (a) Before processing; (b) after processing

    Fig. 5. Schematic of light strip line pre-processing. (a) Before processing; (b) after processing

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    • Table 1. Partial measured results of measurement system

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      Table 1. Partial measured results of measurement system

      Serial numberReal data /mmMeasuring data /mmError /mm
      1(-86.728, 9.156, 528.699)(-86.595, 9.182, 528.731)0.138
      2(-86.500, 9.158, 528.704)(-86.368, 9.184, 528.737)0.137
      3(-86.273, 9.160, 528.709)(-86.141, 9.186, 528.743)0.137
      4(-86.045, 9.162, 528.714)(-85.914, 9.188, 528.749)0.136
      5(-85.817, 9.164, 528.718)(-85.687, 9.190, 528.755)0.137
      6(-85.590, 9.166, 528.723)(-85.460, 9.192, 528.760)0.136
      7(-85.362, 9.168, 528.728)(-85.233, 9.194, 528.766)0.136
      8(-85.134, 9.170, 528.733)(-85.006, 9.196, 528.772)0.136
      9(-84.907, 9.172, 528.738)(-84.779, 9.198, 528.778)0.135

    • Table 2. Comparison of results from different calibration methods

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      Table 2. Comparison of results from different calibration methods

      MethodExperimental equipmentMeasuringdistance /mmError /mm
      Method in Ref.[5]Camera and laser projector6000.1453
      Method in Ref.[6]Camera, LCD projector and two-dimensional translation table9000.3334
      Method in Ref.[7]Camera, laser projector and mobile platform5000.0900
      Proposed methodCamera and laser projector7000.1363
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    Aijuan Li, Rui Xin, Shuanhu Wu. Efficient Calibration Method for Line-Structured Light Vision Measurement System[J]. Laser & Optoelectronics Progress, 2019, 56(22): 221505

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    Paper Information

    Category: Machine Vision

    Received: Apr. 19, 2019

    Accepted: May. 21, 2019

    Published Online: Nov. 9, 2019

    The Author Email: Wu Shuanhu (wushuanhu@ytu.edu.cn)

    DOI:10.3788/LOP56.221505

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology