• Laser & Optoelectronics Progress
  • Vol. 60, Issue 7, 0712005 (2023)
Taotao Li1、*, Pei Shen1, Xiaoqian Zhong1, Xianlei Xu2, and Jiangying Liu1
Author Affiliations
  • 1School of Electromechanical Engineering, Pingxiang University, Pingxiang 337055, Jiangxi, China
  • 2State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology (Beijing), Beijing 100083, China
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    DOI: 10.3788/LOP220829 Cite this Article Set citation alerts
    Taotao Li, Pei Shen, Xiaoqian Zhong, Xianlei Xu, Jiangying Liu. Research on Imaging Quality Comprehensive Evaluation by Multi-Parameters of Line Structured Light Stripe[J]. Laser & Optoelectronics Progress, 2023, 60(7): 0712005 Copy Citation Text show less
    One-dimensional image entropy changes of light stripe image set
    Fig. 1. One-dimensional image entropy changes of light stripe image set
    Local contrast changes of light stripe image set
    Fig. 2. Local contrast changes of light stripe image set
    Definition coefficient changes of light stripe image set
    Fig. 3. Definition coefficient changes of light stripe image set
    Synchronous changes of light stripe image set's H, C, β,and stripe centers extraction deviation Ra
    Fig. 4. Synchronous changes of light stripe image set's H, C, β,and stripe centers extraction deviation Ra
    Light stripe imaging results of metal plate under different exposure time t. (a) t=200 μs; (b) t=1000 μs; (c) t=2000 μs; (d) t=2500 μs; (e) t=5000 μs
    Fig. 5. Light stripe imaging results of metal plate under different exposure time t. (a) t=200 μs; (b) t=1000 μs; (c) t=2000 μs; (d) t=2500 μs; (e) t=5000 μs
    Hign-precision rack
    Fig. 6. Hign-precision rack
    3D measurement results of 7th tooth in high-precision rack. (a) 3D reconstruction of tooth profile; (b) Rssa varies with t
    Fig. 7. 3D measurement results of 7th tooth in high-precision rack. (a) 3D reconstruction of tooth profile; (b) Rssa varies with t
    Characteristic parameterHigh quality light stripe imagePoor quality light stripe image
    Region #2Region #1Region #3
    Exposure time t /μs500-4000100-5004000-15000
    One-dimensional image entropy H2.73-5.461.68-2.735.46-7.06
    Image local contrast C0.5-0.70.7-1.00-0.5
    Table 1. Corresponding t and H ranges of light stripe imaging quality empirical evaluation results
    Evaluation parameterValue range
    Exposure time t /μs1200 ≤ t ≤ 2700
    One-dimensional image entropy H3.81 ≤ H ≤ 4.90
    Image local contrast C0.50 ≤ C ≤ 0.56
    Light stripe definition coefficient β0.95 ≤ β ≤ 1.00
    Stripe centers extraction deviation Ra0.26 ≤ Ra ≤ 0.30
    Table 2. Value ranges of H, C, β,and Ra of high quality light stripe images in image set U
    Exposure time t /μsOne-dimensional image entropy HImage local contrast CLight stripe definition coefficient βComprehensive evaluation result E
    2002.490.980.3135.2
    10003.980.560.9497.2
    20004.640.510.9598.4
    25004.910.500.9396.3
    50006.230.460.8570.8
    Table 3. Multi-parameters comprehensive evaluation results of light stripe images in Fig. 5
    MethodRelevant evaluation parameterExposure time t /μsVariation range of Rssa
    Method 1α≈4.52600~32000.057~0.090
    Method 2R≈160,D≈2100800~20000.022~0.120
    Method 3Llaser≈2102200~30000.034~0.060
    Proposed method3.81 ≤ H ≤ 4.10,0.52 ≤ C ≤ 0.56,0.95 ≤ β ≤ 1.001200~24000.022~0.042
    Table 4. Comparison of evaluation results of different methods
    Taotao Li, Pei Shen, Xiaoqian Zhong, Xianlei Xu, Jiangying Liu. Research on Imaging Quality Comprehensive Evaluation by Multi-Parameters of Line Structured Light Stripe[J]. Laser & Optoelectronics Progress, 2023, 60(7): 0712005
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