In addition, the 3D point cloud obtained from 360° images is rather noisy and unable to construct complex geometries with small dimensions. In this latter case study, a comparison of the point cloud generated by this low-cost sensor and one performed by a high-performance Terrestrial Laser Scanner (TLS), showed a difference of 15 centimeters for 80% of the points. In this environment, the approach that provided the best result in terms of both detail and dimensional accuracy was subsequently applied to the case study of Colonada in Buziaș. In the case study of the laboratory, several tests were carried out to identify the best strategy for reconstructing the 3D model of the observed environment. The analysis was conducted on two sites: one in the laboratory and another directly in the field for the digitization of a large structure (Colonada in Buziaș, Romania). In particular, for this experiment, the Ricoh theta SC2 camera was used. By using spherical photogrammetry and the algorithm based on the structure from motion and multi-view stereo, it is possible to reconstruct the geometry (point cloud) of an object or structure. In this paper, the use of cameras capable of capturing a 360° scene with a single image was assessed.

In this context, the use of low-cost sensors, especially in the photogrammetric field, represents a major research challenge. The digitization of Cultural Heritage is an important activity for the protection, management, and conservation of structures of particular historical and architectural interest.

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