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Assessment of multispectral and hyperspectral imaging systems for digitisation of a Russian icon

MacDonald, LW; Vitorino, T; Picollo, M; Pillay, R; Obarzanowski, M; Sobczyk, J; Nascimento, S; (2017) Assessment of multispectral and hyperspectral imaging systems for digitisation of a Russian icon. Heritage Science , 5 , Article 41. 10.1186/s40494-017-0154-1. Green open access

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Abstract

In a study of multispectral and hyperspectral reflectance imaging, a Round Robin Test assessed the performance of different systems for the spectral digitisation of artworks. A Russian icon, mass-produced in Moscow in 1899, was digitised by ten institutions around Europe. The image quality was assessed by observers, and the reflectance spectra at selected points were reconstructed to characterise the icon’s colourants and to obtain a quantitative estimate of accuracy. The differing spatial resolutions of the systems affected their ability to resolve fine details in the printed pattern. There was a surprisingly wide variation in the quality of imagery, caused by unwanted reflections from both glossy painted and metallic gold areas of the icon’s surface. Specular reflection also degraded the accuracy of the reconstructed reflectance spectrum in some places, indicating the importance of control over the illumination geometry. Some devices that gave excellent results for matte colour charts proved to have poor performance for this demanding test object. There is a need for adoption of standards for digitising cultural heritage objects to achieve greater consistency of system performance and image quality.

Type: Article
Title: Assessment of multispectral and hyperspectral imaging systems for digitisation of a Russian icon
Open access status: An open access version is available from UCL Discovery
DOI: 10.1186/s40494-017-0154-1
Publisher version: https://doi.org/10.1186/s40494-017-0154-1
Language: English
Additional information: Copyright © The Author(s) 2017. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
Keywords: Multispectral, Hyperspectral, Imaging, Digitisation, Reflectance, Spectrum, Specularity, Cultural heritage, Icon, Standards
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
URI: https://discovery.ucl.ac.uk/id/eprint/10074884
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