Special Section on Image Processing for Cultural Heritage

Three-dimensional reconstruction of Roman coins from photometric image sets

[+] Author Affiliations
Lindsay MacDonald, Mona Hess

University College London, Department of Civil, Environmental and Geomatic Engineering, Chadwick Building, Gower Street, London WC1E 6BT, United Kingdom

Vera Moitinho de Almeida

Universitat Autònoma de Barcelona (UAB), Department of Prehistory, Quantitative Archaeology Lab (LAQU), Edifici B Facultat de Filosofia i Lletres, Bellaterra, Barcelona 08193, Spain

J. Electron. Imaging. 26(1), 011017 (Feb 03, 2017). doi:10.1117/1.JEI.26.1.011017
History: Received June 1, 2016; Accepted November 14, 2016
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Abstract.  A method is presented for increasing the spatial resolution of the three-dimensional (3-D) digital representation of coins by combining fine photometric detail derived from a set of photographic images with accurate geometric data from a 3-D laser scanner. 3-D reconstructions were made of the obverse and reverse sides of two ancient Roman denarii by processing sets of images captured under directional lighting in an illumination dome. Surface normal vectors were calculated by a “bounded regression” technique, excluding both shadow and specular components of reflection from the metallic surface. Because of the known difficulty in achieving geometric accuracy when integrating photometric normals to produce a digital elevation model, the low spatial frequencies were replaced by those derived from the point cloud produced by a 3-D laser scanner. The two datasets were scaled and registered by matching the outlines and correlating the surface gradients. The final result was a realistic rendering of the coins at a spatial resolution of 75  pixels/mm (13-μm spacing), in which the fine detail modulated the underlying geometric form of the surface relief. The method opens the way to obtain high quality 3-D representations of coins in collections to enable interactive online viewing.

© 2017 SPIE and IS&T

Citation

Lindsay MacDonald ; Vera Moitinho de Almeida and Mona Hess
"Three-dimensional reconstruction of Roman coins from photometric image sets", J. Electron. Imaging. 26(1), 011017 (Feb 03, 2017). ; http://dx.doi.org/10.1117/1.JEI.26.1.011017


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