Journal of Spectral Imaging,   Volume 7   Article ID a10   (2018)

Peer reviewed Paper

Can hyperspectral imaging be used to map corrosion products on outdoor bronze sculptures?

  • Emilio Catelli
  • Lise Lyngsnes Randeberg
  • Helena Strandberg
  • Bjørn Kåre Alsberg
  • Assimo Maris
  • Lily  Vikki
Department of Chemistry, Norwegian University of Science and Technology (NTNU), N-7491 Trondheim, Norway (Passed away 27 December 2017)

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Department of Chemistry “G. Ciamician”, Alma Mater Studiorum, University of Bologna, 40100 Bologna, Italy

 https://orcid.org/0000-0003-2644-0023
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Oslo kommunes kunstsamling/City of Oslo Art Collection, Kulturetaten/Agency for Cultural Affairs, 0184 Oslo, Norway

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 Corresponding Author
Department of Chemistry, Norwegian University of Science and Technology (NTNU), N-7491 Trondheim, Norway
[email protected]
 https://orcid.org/0000-0002-9634-1381
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 Corresponding Author
Department of Electronic Systems, Norwegian University of Science and Technology (NTNU), N-7491 Trondheim, Norway
[email protected]
 https://orcid.org/0000-0003-2608-3759
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The application of hyperspectral imaging in the field of cultural heritage investigation is growing rapidly. In this study, short wavelength infrared hyperspectral imaging (960–2500 nm) has been explored as a potential non-invasive technique for in situ mapping of corrosion products on bronze sculptures. Two corrosion products, brochantite and antlerite, commonly found on the surfaces of outdoor bronze monuments, were considered. Their spatial distribution was investigated on the surface of the bronze sculpture The Man with the Key by Auguste Rodin in Oslo. The results demonstrate that hyperspectral imaging combined with image analysis algorithms can display the distribution of the two corrosion products in different areas (unsheltered and partially sheltered) of the sculpture.

Keywords: hyperspectral imaging, outdoor bronze sculpture, image analysis, bronze corrosion


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