Fig. 5.

Validation of the 3D geometry reconstruction method using a ball bearing a) and a step pyramid b). The relative 3D point clouds obtained by VisualSFM and converted in WCS are compared with the CAD model (sphere) whose diameter is the “accepted reference value” of the ball bearing c), and with the 3D mesh obtained by Poisson’s reconstruction d), respectively. A comparison along a cross-section enhances the high quality of the reconstruction and the low variability of the reconstructed data (e, f).