Laser & Optoelectronics Progress, Volume. 60, Issue 12, 1211005(2023)

Spherical Center Imaging Location Solution Method for Monocular Spherical Target

Yuanjiong Liu1,2,3, Guan Cheng1,2,3、*, Bo Tang1,2,3, Maozheng He1,2,3, and Guozhong Jiang4
Author Affiliations
  • 1Key Laboratory of Metallurgical Equipment and Its Control, Ministry of Education, School of Machinery and Automation, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China
  • 2Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China
  • 3Institute of Precision Manufacturing, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China
  • 4Jiangsu Jianlong Shore Power Technology Co., Ltd., Yixing 214200, Jiangsu, China
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    Figures & Tables(16)
    Sphere imaging model
    Schematic of Zernike moment edge detection principle. (a) Original edge map; (b) edge map after rotating φ
    Flowchart of the proposed method
    Blurred ellipse image with size of 140×140. (a) Ellipse without rotation; (b) ellipse after rotating 45°
    140×140 ellipse simulation error. (a) Horizontal axis error; (b) vertical axis error
    280×280 ellipse simulation error. (a) Horizontal axis error; (b) vertical axis error
    Influence of salt and pepper noise on ellipse center. (a) Horizontal axis error; (b) vertical axis error
    Monocular measurement experimental platform
    Checkerboard calibration board
    Experimental scheme for measuring the distance of spherical targets
    Experimental results. (a) Experimental results of Group A; (b) experimental results of Group B
    Experimental results of Group C. (a) Absolute deviation comparison; (b) cumulative absolute deviation comparison
    • Table 1. Calibration results

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      Table 1. Calibration results

      fxfyuxvyk1k2k3p1p2
      2303.0122303.6331344.8701010.973-0.1230.1320.027-0.000382-0.000755
    • Table 2. Experimental results of Group A

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      Table 2. Experimental results of Group A

      GroupCenter coordinate before correction /pixelMeasured value before correction /mmError value before correction /mmCenter coordinate after correction /pixelMeasured value after correction /mmError value after correction /mm
      1(340.826,115.024)10.0550.055(340.090,114.776)9.9680.032
      (264.222,115.977)(263.653,115.727)
      2(264.222,115.977)10.0470.047(263.653,115.727)10.0340.034
      (187.397,116.945)(186.993,116.693)
      3(187.397,116.945)10.0990.099(186.993,116.693)10.0060.006
      (110.848,117.984)(110.610,117.731)
      4(110.848,117.984)10.1490.149(110.610,117.731)9.9770.023
      (34.633,119.028)(34.559,118.771)
      5(34.633,119.028)10.0790.079(34.559,118.771)10.0070.007
      (-41.641,120.113)(-41.552,119.856)
    • Table 3. Experimental results of Group B

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      Table 3. Experimental results of Group B

      GroupCenter coordinate before correction /pixelMeasured value before correction /mmError value before correction /mmCenter coordinate after correction /pixelMeasured value after correction /mmError value after correction /mm
      1(-41.643,120.128)10.0380.038(-41.554,119.870)10.0100.010
      (34.651,119.043)(34.576,118.787)
      2(34.651,119.043)10.0380.038(34.576,118.787)9.9730.027
      (110.829,118.025)(110.590,117.772)
      3(110.829,118.025)10.0950.095(110.590,117.772)10.0090.009
      (187.371,116.960)(186.968,116.708)
      4(187.371,116.960)10.1500.150(186.968,116.708)10.0360.036
      (264.222,116.004)(263.653,115.754)
      5(264.222,116.004)10.0990.099(263.653,115.754)9.9640.036
      (340.793,115.047)(340.057,114.799)
    • Table 4. Experimental results of Group C

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      Table 4. Experimental results of Group C

      GroupCenter coordinate before correction /pixelMeasured value before correction /mmError value before correction /mmCenter coordinate after correction /pixelMeasured value after correction /mmError value after correction /mm
      1(344.135,111.779)5.0510.051(343.394,111.538)4.9870.013
      (305.716,112.475)(305.059,112.233)
      2(305.716,112.475)5.0450.045(305.059,112.233)4.9830.017
      (267.466,113.043)(266.892,112.801)
      3(267.466,113.043)5.0680.068(266.892,112.801)5.0080.008
      (229.153,113.643)(228.661,113.400)
      4(229.153,113.643)5.0870.087(228.661,113.400)5.0390.039
      (190.598,114.274)(190.190,114.029)
      5(190.598,114.274)5.0930.093(190.190,114.029)5.0380.038
      (152.295,114.942)(151.968,114.696)
      6(152.295,114.942)5.0470.047(151.968,114.696)5.0020.002
      (114.182,115.503)(113.937,115.256)
      7(114.182,115.503)5.0420.042(113.937,115.256)5.0010.001
      (76.118,116.148)(75.954,115.899)
      8(76.118,116.148)5.0500.050(75.954,115.899)5.0160.016
      (37.956,116.784)(37.875,116.532)
      9(37.956,116.784)5.3570.357(37.875,116.532)5.0080.008
      (-0.214,117.413)(-0.213,117.159)
      10(-0.214,117.413)4.9780.022(-0.213,117.159)4.9800.020
      (-38.337,118.122)(-38.254,117.867)
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    Yuanjiong Liu, Guan Cheng, Bo Tang, Maozheng He, Guozhong Jiang. Spherical Center Imaging Location Solution Method for Monocular Spherical Target[J]. Laser & Optoelectronics Progress, 2023, 60(12): 1211005

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    Paper Information

    Category: Imaging Systems

    Received: Jun. 27, 2022

    Accepted: Jul. 7, 2022

    Published Online: Jun. 1, 2023

    The Author Email: Guan Cheng (1135217680@qq.com)

    DOI:10.3788/LOP221932

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