Rilievo 3D non a contatto: tecniche speciali per l'arte rupestre

MANNU, CARLA;RODRIGUEZ, GIUSEPPE;VANZI, MASSIMO

2016-01-01

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Abstract

From the point of view of the rock art, the 3D reconstruction methodologies oer the possibility of a meticulous study of the findings and engravings, with the complete relief and electronic storage of all the data. Here is proposed a photogrammetric technique, very easy for dataset acquisition, really fast during the elaboration process and really cheaper than the laser scanner. Contrary to the other photogrammetric techniques, the Photometric Stereo needs some shots taken with a reflex camera in a fixed position on a tripod, from some different lighting angle. The data elaboration gives back a high resolution 3D model, with all the engravings from few micron thickness. The processing also reconstructs the albedo, that is the pure surface color without any shadow. The 3D surface, after the albedo coloring, appears like a really genuine virtual reconstruction.