Data acquisitions

The sarcophagus has been digitally recorded using reality-based technologies and methods in order to produce photorealistic and metrically accuracte 3D models of the Etruscan masterpiece. A stereoscopic movie will be also produced.

Different partners, mainly from research centers and academia, are involved in the project: National Research Council - CNR, Bruno Kessler Foundation - FBK, Bologna University and Leica company. The participants of the projects have used different acquisition procedures in which they are specialized to record with high geometric definition and accuracy the shape and the radiometry of the sarcophagus.

The 3D Optical Metrology Unit (3DOM) of FBK, Trento, is specialized in photogrammetric acquisitions and data processing. The shape and texture characteristics of the sarcophagus as well as lighting conditions in the room demanded a careful photogrammetric planning. In order to record an object like this masterpiece for accurate 3D modeling, high geometric resolution images were taken at a short distance from the object with an image scale (magnification) usually less than 1:25. To guarantee a perfect photographic reproduction of the final 3D model, the lighting was set up cautiously. More than 500 photogrammetric images were taken all around the sarcophagus at an average distance of 1 meter using a Nikon D3X SLR (24 Mpx) digital camera mounting a 50 mm lens. Tripods, supports and photographic lamps weredonated by the italian company Manfrotto, a Vitec Group brand (http://www.manfrotto.it/). The spatial resolution of the images on the object was about 0.15 mm. The expected accuracy of the final 3D model is about 0.3 mm.

   

 

 

The Visual Computing Lab of ISTI-CNR, Pisa (http://vcg.isti.cnr.it/), is a Computer Graphics research laboratory with an established experience in the application of technologies on Cultural Heritage. The Lab Staff performed the 3D scanning campaign of the statue using a Laser Triangulation 3D Scanner (Minolta Vivid 910), and a careful photographic campaign to obtain an highly detailed model both in geometry and color appearance. The acquisition of geometry was obtained by scanning small portions (around 30 by 20 cm) of the surface, that were then aligned and merged to produce a final model. The acquisition campaign resulted in more than 350 single range maps (for a total of more than 60 Million measured points), and more than 200 images. The whole acquisition was completed in one day of work. The expected accuracy of the final 3D model is about 0.5 mm.

 

 

 


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