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Hypercolorimetric multispectral imaging system for cultural heritage diagnostics: an innovative study for copper painting examination

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Abstract.

The aim of this work is to test the application of a new multispectral imaging system, named Hypercolorimetric Multispectral Imaging, on two little 17th century oil paintings on copper in order to support the restoration activities. Hypercolorimetric Multispectral Imaging is a non-invasive, rapid and diagnostic technique that allows in situ accurate and reproducible spectral reflectance measurements between 300nm and 1000nm to obtain seven monochromatic very high spatial resolution images (36 megapixels starting from RAW format). The acquired images are transformed into radiometric and colorimetric measurements, consisting of 7 monochromatic images of spectral reflectance and one colorimetric image. All these calibrated images constitute the base for further processing performed through a dedicated software that implements a number of functions. In the present paper, a subset of those functions has been used. Specifically: Principal Component Analysis, spectral clustering, spectral mapping, multiband contrast enhancement and edge detection. Combining calibrated images of different spectral regions acquisitions, it was possible to extract relevant information about the state of conservation of the two copper paintings and further significant details were readable compared with the data coming from each single acquisition. The Hypercolorimetric Multispectral Imaging acquisition process revealed to be fast allowing to be performed during the cleaning stage of the paintings. The imaging nature of the analysis allowed to compare and map different areas of the surfaces producing degradation maps of the painting layers, which represents a precious decision-making tool for conservators.

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Authors and Affiliations

  1. Engineering for Energy and Environment, DEIm Dept., University of Tuscia, Viterbo, Italy

    C. Colantonio & G. Calabrò

  2. Laboratory of Diagnostics and Materials Science, DEIm Dept., University of Tuscia, Viterbo, Italy

    C. Pelosi

  3. Restoration Laboratory, DIBAF Dept., University of Tuscia, Viterbo, Italy

    L. D’Alessandro & S. Sottile

  4. Profilocolore S.r.l., Roma, Italy

    M. Melis

Authors
  1. C. Colantonio
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  2. C. Pelosi
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  3. L. D’Alessandro
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  4. S. Sottile
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  5. G. Calabrò
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  6. M. Melis
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Correspondence to C. Pelosi.

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Colantonio, C., Pelosi, C., D’Alessandro, L. et al. Hypercolorimetric multispectral imaging system for cultural heritage diagnostics: an innovative study for copper painting examination. Eur. Phys. J. Plus 133, 526 (2018). https://doi.org/10.1140/epjp/i2018-12370-9

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  • DOI: https://doi.org/10.1140/epjp/i2018-12370-9

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