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Optical Instruments, Volume. 44, Issue 5, 53(2022)

An endoscope welding spot detection system based on FPGA image processing

Chenxin JIA, Rongfu ZHANG*, Mengyuan REN, Zhaohui XU, Yangdan GONGJI, and Hanlin LIU
Author Affiliations
  • School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
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    Figures&Tables (12)
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    Figures & Tables(12)
    Overall block diagram of the system

    Fig. 1. Overall block diagram of the system

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    3×3 slide window to generate graph

    Fig. 2. 3×3 slide window to generate graph

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    Effect of image acquisition

    Fig. 3. Effect of image acquisition

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    Structure of pixel coordinate system

    Fig. 4. Structure of pixel coordinate system

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    Random placement of the target board

    Fig. 5. Random placement of the target board

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    Flow chart of welding point coordinate acquisition

    Fig. 6. Flow chart of welding point coordinate acquisition

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    Linear region segmentation model

    Fig. 7. Linear region segmentation model

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    Test platform

    Fig. 8. Test platform

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    Extraction of coordinates of solder joint

    Fig. 9. Extraction of coordinates of solder joint

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    Defect of target plate

    Fig. 10. Defect of target plate

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    • Table 1. Comparision between the detected coordinates and the actual coordinates

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      Table 1. Comparision between the detected coordinates and the actual coordinates

      样本点像素坐标/pixel实际坐标/mm计算坐标/mmX坐标残差/mm Y坐标残差/mm 焊点坐标残差/mm
      1(621,355)(6.660,3.794)(6.713,3.838)0.0530.0440.069
      2(620,294)(6.691,3.189)(6.702,3.178)0.0110.0110.016
      3(590,328)(6.367,3.502)(6.378,3.546)0.0110.0440.045
      4(645,321)(6.951,3.438)(6.972,3.470)0.0210.0320.038
      5(647,408)(6.951,4.378)(6.994,4.410)0.0430.0320.054
      6(648,346)(6.983,3.762)(7.005,3.740)0.0220.0220.031
      7(618,381)(6.681,4.086)(6.681,4.119)0.0000.0330.033
      8(675,370)(7.254,4.021)(7.297,4.000)0.0430.0210.048
      9(635,343)(6.854,3.675)(6.864,3.704)0.0100.0290.030
      10(644,278)(6.929,3.059)(6.962,3.005)0.0330.0540.063
      11(609,310)(6.593,3.329)(6.583,3.349)0.0100.0200.022
      12(670,309)(7.243,3.329)(7.243,3.340)0.0000.0110.011
      13(636,355)(6.843,3.838)(6.875,3.838)0.0320.0000.032
      14(655,298)(7.059,3.254)(7.081,3.221)0.0220.0330.040
      15(618,324)(6.648,3.492)(6.681,3.502)0.0330.0100.035
      16(676,333)(7.254,3.611)(7.263,3.603)0.0090.0080.012
      17(681,315)(7.351,3.373)(7.362,3.405)0.0110.0320.034
      18(643,274)(6.918,2.994)(6.944,2.971)0.0260.0230.035
      19(640,314)(6.940,3.384)(6.922,3.394)0.0180.0100.020
      20(684,277)(7.351,2.994)(7.384,2.994)0.0330.0000.033

    • Table 2. Analysis of experimental results of welding spot detection

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      Table 2. Analysis of experimental results of welding spot detection

      坐标数据分析类型均值/mm极大值/mm极小值/mm极差/mm样本数
      焊点X轴坐标残差 0.0220.05300.05320
      焊点Y轴坐标残差 0.0210.05400.05420
      焊点坐标残差0.0350.0690.0110.05820
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    Chenxin JIA, Rongfu ZHANG, Mengyuan REN, Zhaohui XU, Yangdan GONGJI, Hanlin LIU. An endoscope welding spot detection system based on FPGA image processing[J]. Optical Instruments, 2022, 44(5): 53

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    Paper Information

    Category: DESIGN AND RESEARCH

    Received: Dec. 30, 2021

    Accepted: --

    Published Online: Nov. 14, 2022

    The Author Email: Rongfu ZHANG (zrf@usst.edu.cn)

    DOI:10.3969/j.issn.1005-5630.2022.005.007

    Topics

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