Precision Evaluation of Three-dimensional Feature Points Measurement by Binocular Vision
Precision Evaluation of Three-dimensional Feature Points Measurement by Binocular Vision
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DOI：
10.3807/josk.2011.15.1.030
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发表时间：
2011-03
影响因子：
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通讯作者：
Guan Xu;Xiaotao Li;Jian Su;Hongda Pan;Guangdong Tian
中科院分区：
文献类型：
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作者：
Guan Xu;Xiaotao Li;Jian Su;Hongda Pan;Guangdong Tian
从两个摄像机获得的双目对图像可以用于计算特征点的三维（3D）世界坐标。然而，要应用这种方法，双目视觉的测量精度取决于一些结构因素。本文对测量距离、基线距离和基线方向进行了实验研究。它们对相机重建精度的影响进行了研究。双目模型的测试集由立体对图像中的一系列特征点和相应的3D世界坐标组成。为了提高双目视觉系统的测量精度，提出了一种增大两摄像机基线距离的方法。随着基线距离的增加，测量误差的大小和分布存在一个拐点。增加基线距离的精度益处并不明显，因为在该实验中基线距离超过1000 mm。此外，据观察，从设置推导出的方向误差是较低的主测量方向是类似的基线方向。
Binocular-pair images obtained from two cameras can be used to calculate the three-dimensional (3D) world coordinate of a feature point. However, to apply this method, measurement accuracy of binocular vision depends on some structure factors. This paper presents an experimental study of measurement distance, baseline distance, and baseline direction. Their effects on camera reconstruction accuracy are investigated. The testing set for the binocular model consists of a series of feature points in stereo-pair images and corresponding 3D world coordinates. This paper discusses a method to increase the baseline distance of two cameras for enhancing the accuracy of a binocular vision system. Moreover, there is an inflexion point of the value and distribution of measurement errors when the baseline distance is increased. The accuracy benefit from increasing the baseline distance is not obvious, since the baseline distance exceeds 1000 mm in this experiment. Furthermore, it is observed that the direction errors deduced from the set-up are lower when the main measurement direction is similar to the baseline direction.