The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
Publications Copernicus
Articles | Volume XL-5/W2
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XL-5/W2, 647–652, 2013
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XL-5/W2, 647–652, 2013

  22 Jul 2013

22 Jul 2013


I. Toschi, R. Rivola, E. Bertacchini, C. Castagnetti, M. Dubbini, and A. Capra I. Toschi et al.
  • DIEF, Dept. of Engineering "Enzo Ferrari", University of Modena and Reggio Emilia, Via Vignolese 905, 41125, Modena, Italy
  • DiSCi, Dept. of History Culture Civilization, Headquarters of Geography, University of Bologna, Via Guerrazzi 20, 40125, Bologna, Italy

Keywords: Calibration, 3D Modelling, Accuracy, Close Range Photogrammetry, Open-source

Abstract. Among the many open-source software solutions recently developed for the extraction of point clouds from a set of un-oriented images, the photogrammetric tools Apero and MicMac (IGN, Institut Géographique National) aim to distinguish themselves by focusing on the accuracy and the metric content of the final result. This paper firstly aims at assessing the accuracy of the simplified and automated calibration procedure offered by the IGN tools. Results obtained with this procedure were compared with those achieved with a test-range calibration approach using a pre-surveyed laboratory test-field. Both direct and a-posteriori validation tests turned out successfully showing the stability and the metric accuracy of the process, even when low textured or reflective surfaces are present in the 3D scene. Afterwards, the possibility of achieving accurate 3D models from the subsequently extracted dense point clouds is also evaluated. Three different types of sculptural elements were chosen as test-objects and "ground-truth" data were acquired with triangulation laser scanners. 3D models derived from point clouds oriented with a simplified relative procedure show a suitable metric accuracy: all comparisons delivered a standard deviation of millimeter-level. The use of Ground Control Points in the orientation phase did not improve significantly the accuracy of the final 3D model, when a small figure-like corbel was used as test-object.