Nuovi sviluppi nelle tecniche di stereofotometria 3D di incisioni e rilievi. Applicazioni nella tomba XV di Sos Furrighesos, Sardegna

Mannu C;RODRIGUEZ, GIUSEPPE;TANDA, GIUSEPPA;VANZI, MASSIMO

2015-01-01

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Abstract

Here is proposed a Photogrammetric technique known since a long time as Photometric Stereo, as cheap and easy technique for taking 3Ds of rock art engraving and relieves. Unlike stereoscopic or monoscopic photogrammetry, this technique uses a standard reflex camera fixed in the same point of view for each shot, under different lighting direction. The image processing gives back three images: the x and y gradients and the “albedo”, which is the surface real color without any shading interference. The 3D surface is recreated from the gradient maps, with good results comparables with the ones taken from the laser scanner, and a very natural appaearance thanks to the Albedo recovery color. The exceptional acquisition aptitude and preservation of the 3D information even under non-ideal conditions and arduous locations is the crux of this technique This presentation is focused on the considerables improvements recently achieved in application modes, execution times and quality results. As example, here are presented the results in XV grave of the Sos Furrighesos’ necropolis in Sardinia.