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Three-dimensional reconstruction of Roman coins from photometric image sets

MacDonald, LW; Moitinho de Almeida, V; Hess, M; (2017) Three-dimensional reconstruction of Roman coins from photometric image sets. Journal of Electronic Imaging , 26 (1) , Article 011017. 10.1117/1.JEI.26.1.011017. Green open access

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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.

Type: Article
Title: Three-dimensional reconstruction of Roman coins from photometric image sets
Open access status: An open access version is available from UCL Discovery
DOI: 10.1117/1.JEI.26.1.011017
Publisher version: http://dx.doi.org/10.1117/1.JEI.26.1.011017
Language: English
Additional information: Copyright © 2017 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. / This paper is part of the "Special Section on Image Processing for Cultural Heritage" of the Journal of Electronic Imaging. It can be seen on this page with institutional access http://www.isprs-ann-photogramm-remote-sens-spatial-inf-sci.net/III-5/81/2016/isprs-annals-III-5-81-2016.pdf or here http://caps.luminad.com:8080/stockage/stock/LDL-SPIE-JEI-16465SS/JEI-16465SS_online.pdf.
Keywords: 3D, surface normals, photometric stereo, laser scanning, coins
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
UCL > Provost and Vice Provost Offices > UCL SLASH
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of Arts and Humanities > Dept of Information Studies
URI: https://discovery.ucl.ac.uk/id/eprint/1520053
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