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Calibration of quad-camera measurement systems using a one-dimensional calibration object for three-dimensional point reconstruction

机译：使用一维校准对象进行三维校准对象的四维校准对象的校准

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摘要

A quad-camera visual measurement system must have a calibration accuracy that is equivalent to its reconstruction accuracy. We investigate the effects of quad-camera calibration methods and propose a method based on a one-dimensional (1-D) object. First, the essential matrices are calculated and combined with the RANSAC method to obtain the image coordinate of the 1-D calibration object. Then, the initial values of the four camera matrices are retrieved from the essential matrices to scale. Subsequently, the Euclidean distance between the calibration points of the 1 -D calibration object is used to retrieve the scale factor. Furthermore, an uncertainty analysis of three-dimensional (3-D) point reconstruction is conducted, and based on this, an iterative linear calibration method is introduced to refine the initial calibration results. Finally, a set of calibration objective functions are established by analyzing the measurement process. A synthetic optimizing algorithm is adopted to obtain the high-precision calibration results of the quad-camera measurement system. Experiments are conducted to analyze the calibration accuracy and robustness of the proposed method in the presence of noise. The results indicate that the proposed method can increase the 3-D measurement accuracy and robustness.
机译：四码相机可视测量系统必须具有相当于其重建精度的校准精度。我们调查四边形相机校准方法的影响，并提出了一种基于一维（1-D）对象的方法。首先，计算基本基质并与RANSAC方法组合以获得1-D校准对象的图像坐标。然后，从基本矩阵检索四个相机矩阵的初始值以比例。随后，使用1 -D校准对象的校准点之间的欧几里德距离来检索比例因子。此外，对三维（3-D）点重建进行了不确定性分析，并基于此，引入了一种迭代线性校准方法以优化初始校准结果。最后，通过分析测量过程来建立一组校准目标功能。采用合成优化算法来获得四码相机测量系统的高精度校准结果。进行实验以分析噪声存在下所提出的方法的校准精度和鲁棒性。结果表明该方法可以提高3-D测量精度和鲁棒性。

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  • 来源
    《Optical engineering》 |2019年第6期|064107.1-064107.11|共11页
  • 作者

    Yunhui Li; Ju Huo; Jia Liu; Ming Yang;

  • 作者单位

    Harbin Institute of Technology School of Astronautics Harbin China;

    Harbin Institute of Technology School of Astronautics Harbin China Harbin Institute of Technology School of Electrical Engineering Harbin China;

    System Engineering Research Institute Beijing China;

    Harbin Institute of Technology School of Astronautics Harbin China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    instrumentation; measurement and metrology; machine vision; calibration; vision-binocular and stereopsis;

    机译：仪表;测量和计量;机器视觉;校准;视力 - 双目和立体;

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