Samson Éric, Laurendeau Denis, Parizeau Marc
Electrical and Computer Engineering, Faculty of Science and Engineering, Université Laval, Quebec City, QC G1V 0A6, Canada.
Sensors (Basel). 2022 Feb 24;22(5):1784. doi: 10.3390/s22051784.
The accuracy of 3D reconstruction for metrology applications using active stereo pairs depends on the quality of the calibration of the system. Active stereo pairs are generally composed of cameras mounted on tilt/pan mechanisms separated by a constant or variable baseline. This paper presents a calibration approach based on speckle metrology that allows the separation of translation and rotation in the estimation of extrinsic parameters. To achieve speckle-based calibration, a device called an Almost Punctual Speckle Source (APSS) is introduced. Using the APSS, a thorough method for the calibration of extrinsic parameters of stereo pairs is described. Experimental results obtained with a stereo system called the Agile Stereo Pair (ASP) demonstrate that speckle-based calibration achieves better reconstruction performance than methods using standard calibration procedures. Although the experiments were performed with a specific stereo pair, such as the ASP, which is described in the paper, the speckle-based calibration approach using the APSS can be transposed to other stereo setups.
使用主动立体对进行计量应用的三维重建精度取决于系统校准的质量。主动立体对通常由安装在倾斜/平移机构上的相机组成，这些相机由固定或可变的基线隔开。本文提出了一种基于散斑计量的校准方法，该方法允许在估计外部参数时分离平移和旋转。为了实现基于散斑的校准，引入了一种称为几乎点状散斑源（APSS）的设备。使用APSS，描述了一种用于立体对外部参数校准的全面方法。使用称为敏捷立体对（ASP）的立体系统获得的实验结果表明，基于散斑的校准比使用标准校准程序的方法具有更好的重建性能。尽管实验是使用本文中描述的特定立体对（如ASP）进行的，但使用APSS的基于散斑的校准方法可以转换到其他立体设置。
