Chinese Optics, Volume. 17, Issue 1, 1(2024)

On-machine detection technology and application progress of high dynamic range fringe structured light

Ze-long LIU, Mao-yue LI*, Xin-yuan LU, and Ming-lei ZHANG
Author Affiliations
  • Key Laboratory of Advanced Manufacturing and Intelligent Technology, Ministry of Education, Harbin University of Science and Technology, Harbin 150080, China
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    Figures & Tables(18)
    Schematic diagram of monocular structured light measurement principle[8]
    Schematic diagram of structured light on-machine detection
    Architecture of on-machine detection system of structured light
    The process of exposure fusion algorithm[17]
    Polarization measurement system designed by Xiang[24]
    COPMD measurement system in an enclosed laser cavity[26]
    Fringe reflection setup in on-machine surface measurement system[30]
    Experimental device diagram of large diameter parabolic reflector[31]
    The measurement results by Jiang’s method[41]
    Schematic diagram of brightness attenuation in different channels of color image[51]
    The measurement results of dynamic objects by Liu’s method[53]
    The measurement results of tiny reflective objects by Hu’s method[60]
    On-machine detection equipment with structured light in EBAM machine tool[70]
    High dynamic range fringe pattern improvement network[72]
    • Table 1. Classification of three-dimensional visual measurement technology

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      Table 1. Classification of three-dimensional visual measurement technology

      视觉测量分类是否投射光源具体分类特点
      被动视觉测量单目视觉测量基于图像聚焦程度完成三维重建,多用于显微视觉测量中。
      双目视觉测量根据三角测量原理实现三维重建,应用于双目立体摄像头。
      多目视觉测量增加辅助相机,通过光束平差提高测量精度。
      主动视觉测量点扫描式激光器投射光点,根据光标中心坐标和标定数据进行重建,测量效率低。
      线扫描式激光器投射光条代替光点,提高效率,广泛应用于激光扫描仪中。
      面扫描式通过投影仪投射二维结构光,单次投射覆盖区域大,测量效率最高。
    • Table 2. Comparison of HDR technologies based on hardware devices

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      Table 2. Comparison of HDR technologies based on hardware devices

      HDR技术额外硬件测量精度参考文献
      相机曝光MAE<0.1 mm[13, 17]
      偏振滤光片偏振片MAE<0.1 mm[23-24]
      相位偏折术LCD显示屏MAE<0.001 mm[27, 30-31]
      光度立体法多个光源MAE<0.01 mm[37-38]
    • Table 3. Comparison of HDR technologies based on fringe algorithm

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      Table 3. Comparison of HDR technologies based on fringe algorithm

      HDR技术算法思路算法复杂程度测量精度参考文献
      调整条纹强度逐像素改变条纹灰度值MAE<0.03 mm[39, 44-45]
      颜色信息颜色通道分离PAE<0.03 rad[48, 49]
      图案编码、解码增加相移步数、多频条纹PAE<0.02 rad[52, 55, 57]
      智能算法神经网络处理高光图像、预测相位RMSE<0.06 mm[70, 72]
    • Table 4. Summary of various HDR measurement technologies

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      Table 4. Summary of various HDR measurement technologies

      HDR技术优点缺点光线条件适应性系统硬件设备检测效率加工在机检测
      相机曝光无需添置额外硬件、无后续其他处理。选择曝光时间具有一定盲目性,需多次测量合成最优数据。单次曝光适应性较差,多重曝光适应性好。简单不适用
      偏振滤光片额外硬件较为简单、无其他复杂算法。单偏振通道易降低整体图像的SNR,使用多个偏振通道时,需多次调整偏振片角度合成最优数据。单通道适应性较差,多通道适应性好。单通道简单,多通道较复杂。不适用
      相位偏折术适用于类镜面物体的测量,测量精度高,无其他复杂算法空间摆放位置受限制,不适用于金属等反光件。简单适用(镜面、类镜面工件)
      光度立体法利用多照明系统实现视角补盲建立的反射模型不具有普适性。复杂不适用
      调整条纹强度逐像素调整图像亮度,条纹图像具有较高的SNR对于场景和反射区域的标定需投射多组条纹确定映射关系,算法的效率需依靠投影仪的帧率决定。简单(配合高速投影)适用(配合高速投影)
      颜色信息算法简单,无其他复杂算法对于带有颜色和纹理特征的被测物,测量精度会受到影响。简单适用
      图案编码、解码算法简单增加条纹频率和相移步数,影响了测量的效率,且测量精度较低。简单不适用
      智能算法测量效率高,可以实现动态测量算法复杂,成本较高,需要高度定制的训练样本。简单适用
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    Ze-long LIU, Mao-yue LI, Xin-yuan LU, Ming-lei ZHANG. On-machine detection technology and application progress of high dynamic range fringe structured light[J]. Chinese Optics, 2024, 17(1): 1

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    Paper Information

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    Received: Apr. 16, 2023

    Accepted: --

    Published Online: Mar. 28, 2024

    The Author Email:

    DOI:10.37188/CO.2023-0068

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