Color segmentation and neural networks for automatic graphic relief of the state of conservation of artworks

  • Annamaria Amura University of Urbino Carlo Bo. Department of Pure and Applied Sciences, Urbino, Italy
  • Anna Tonazzini National Research Council of Italy, Institute of Information Science and Technologies, Signals and Images Laboratory. Pisa, Italy.
  • Emanuele Salerno National Research Council of Italy, Institute of Information Science and Technologies, Signals and Images Laboratory. Pisa, Italy.
  • Stefano Pagnotta National Research Council of Italy, Institute of Chemistry of Organometallic Compounds, Applied and Laser Spectroscopy Laboratory, Pisa, Italy.
  • Vincenzo Palleschi National Research Council of Italy, Institute of Chemistry of Organometallic Compounds, Applied and Laser Spectroscopy Laboratory, Pisa, Italy
Keywords: Multispectral images, Segmentation algorithms, Image analysis, Shape representation and analysis, Cultural heritage, Raster to vector, Neural networks

Abstract

This paper proposes a semi-automated methodology based on a sequence of analysis processes performed on multispectral images of artworks and aimed at the extraction of vector maps regarding their state of conservation. The graphic relief of the artwork represents the main instrument of communication and synthesis of information and data acquired on cultural heritage during restoration. Despite the widespread use of informatics tools, currently, these operations are still extremely subjective and require high execution times and costs. In some cases, manual execution is particularly complicated and almost impossible to carry out. The methodology proposed here allows supervised, partial automation of these procedures avoids approximations and drastically reduces the work times, as it makes a vector drawing by extracting the areas directly from the raster images. We propose a procedure for color segmentation based on principal/independent component analysis (PCA/ICA) and SOM neural networks and, as a case study, present the results obtained on a set of multispectral reproductions of a painting on canvas.

Author Biographies

Annamaria Amura, University of Urbino Carlo Bo. Department of Pure and Applied Sciences, Urbino, Italy

Annamaria Amura is a Ph.D. Candidate in Computer Science at the University of Urbino. She holds a BS degree in Technology for the Conservation and Restoration of Cultural Heritage, Class 41, and an M.Sc. degree in Graphics of Images, LM12, Documentation, and Photography for Cultural Heritage. Her research interests include digital photography, image analysis, features extraction from diagnostic images, raster to vector automation method, GIS database, virtual restoration, and graphic documentation.

Anna Tonazzini, National Research Council of Italy, Institute of Information Science and Technologies, Signals and Images Laboratory. Pisa, Italy.

Anna Tonazzini is a senior researcher at the Institute of Information Science and Technologies, National Research Council of Italy, in Pisa. She coordinated several Projects in Image Processing and Analysis, Neural Networks and Learning, Computational Biology and Document Analysis, and is co-author of over 100 peer-reviewed papers. In particular, she was the ISTI responsible for the UE Project ISYREADET, and several national projects on historical manuscript virtual restoration and analysis.

Emanuele Salerno, National Research Council of Italy, Institute of Information Science and Technologies, Signals and Images Laboratory. Pisa, Italy.

Emanuele Salerno is a senior researcher at the Institute of Information Science and Technologies of the National Research Council of Italy. His interests range from nondestructive evaluation to image processing and analysis, with several applications. Since 2004 he is involved in studies on ICT technologies for cultural heritage, working on the virtual restoration of ancient documents and paintings. He is a senior member of the IEEE, Signal Processing Society, of the Italian Association of Electricity, Electronics, Automation, Informatics, and Telecommunications (AEIT).

Stefano Pagnotta, National Research Council of Italy, Institute of Chemistry of Organometallic Compounds, Applied and Laser Spectroscopy Laboratory, Pisa, Italy.

Stefano Pagnotta Dr. Pagnotta is an editorial board member of the Anthropology Open Journal and "Cultore della Materia" in Archaeology at the University of Pisa. Ph.D. in Earth Sciences, Md in Archaeology and Bd in Conservation of Cultural Heritage. Actually, he is a research fellow at ICCOM CNR. Visiting scientist at the Institut für Chemie in Potsdam, at the Pure and the Applied Science Department University of Urbino and theVinča Nuclear Institute. Author of more than 50 papers in international peer-reviewed journals.

Vincenzo Palleschi, National Research Council of Italy, Institute of Chemistry of Organometallic Compounds, Applied and Laser Spectroscopy Laboratory, Pisa, Italy

Vincenzo Palleschi is a Physicist, Senior Researcher at the Institute of Chemistry of Organometallic Compounds, and Head of the Applied and Laser Spectroscopy Laboratory at Research Area of CNR in Pisa (Italy). Is a world-renowned expert in LIBS, in X-Ray Fluorescence analysis, micro-Raman spectroscopy, Multispectral Imaging, 3D photogrammetry and Chemometrics. He has published more than 200 papers in ISI journals and the book 'Laser-Induced Breakdown Spectroscopy: Principles and Applications'.

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Published
2020-07-01
How to Cite
Amura, A., Tonazzini, A., Salerno, E., Pagnotta, S. and Palleschi, V. (2020) “Color segmentation and neural networks for automatic graphic relief of the state of conservation of artworks”, Cultura e Scienza del Colore - Color Culture and Science, 12(02), pp. 07-15. doi: 10.23738/CCSJ.120201.
Section
Papers