Stereofotometria per la documentazione in 3D di incisioni e rilievi. Applicazioni nell’arte preistorica della Sardegna
- Title
- Stereofotometria per la documentazione in 3D di incisioni e rilievi. Applicazioni nell’arte preistorica della Sardegna
- Date
- 2013
- Is Part Of
- XXV Valcamonica Symposium
- Pages
- 155 - 160
- Language
- ita
- Publisher
- CCSP
- Place Published
- Capo di Ponte
- Abstract
- A photogrammetric technique (Photometric Stero), known since a long time, is here proposed as an agile an cheap tool for 3D recording engravings and relieves. Different from stereoscopic or monoscopic Photogrammetry, the Photometric Stereo uses a standard camera at a fixed point to take typically four snapshots of the same object under different lighting directions. Image processing gives three maps: the “Albedo” (that is the color of the surface without any shading), the x-gradient and the ygradient. From gradient maps one gets the 3D shape of the original surface, with results comparable with those obtained by the much more expensive and demanding laser scanning machines. The 3D surface, once re-colored with the original Albedo, renders highly natural virtual reconstructions.
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