Rodríguez-Martín Manuel, Rodríguez-Gonzálvez Pablo
Department of Mechanical Engineering, Universidad de Salamanca, Avenida Fernando Ballesteros, 0, Béjar, 37700 Salamanca, Spain.
Department of Technology, Universidad Católica de Ávila, C/ Canteros s/n, 05005 Ávila, Spain.
Sensors (Basel). 2020 May 22;20(10):2936. doi: 10.3390/s20102936.
Three-dimensional (3D) reconstruction is a useful technique for the documentation, characterization, and evaluation of small archeological objects. In this research, a comparison among different photogrammetric setups that use different lenses (macro and standard zoom) and dense point cloud generation calibration processes for real specific objects of archaeological interest with different textures, geometries, and materials is raised using an automated data collection. The data acquisition protocol is carried out from a platform with control points referenced with a metrology absolute arm to accurately define a common spatial reference system. The photogrammetric reconstruction is performed considering a camera pre-calibration as well as a self-calibration. The latter is common for most data acquisition situations in archaeology. The results for the different lenses and calibration processes are compared based on a robust statistical analysis, which entails the estimation of both standard Gaussian and non-parametric estimators, to assess the accuracy potential of different configurations. As a result, 95% of the reconstructed points show geometric discrepancies lower than 0.85 mm for the most unfavorable case and less than 0.35 mm for the other cases.
三维（3D）重建是记录、表征和评估小型考古文物的一项有用技术。在本研究中，利用自动数据采集，对不同的摄影测量设置进行了比较，这些设置使用不同的镜头（微距和标准变焦）以及针对具有不同纹理、几何形状和材料的实际特定考古感兴趣对象的密集点云生成校准过程。数据采集协议是从一个带有由计量绝对臂引用的控制点的平台上执行的，以准确定义一个公共空间参考系统。摄影测量重建考虑了相机预校准以及自校准。后者在考古学中的大多数数据采集情况中很常见。基于稳健的统计分析对不同镜头和校准过程的结果进行比较，这需要估计标准高斯估计器和非参数估计器，以评估不同配置的精度潜力。结果，在最不利的情况下，95%的重建点显示几何差异低于0.85毫米，在其他情况下则小于0.35毫米。
