☆ 4.5 Article

Colorimetric similarity evaluation methodology for heterogeneous rock surfaces using digital imaging

JOURNAL OF CULTURAL HERITAGE (2023)

Journal

JOURNAL OF CULTURAL HERITAGE

Volume 64, Issue -, Pages 244-254

Publisher

ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER

DOI: 10.1016/j.culher.2023.10.004

Keywords

Colorimetric similarity; Image segmentation; Color clustering; Colorimetry

Categories

Archaeology Art Chemistry, Analytical Geosciences, Multidisciplinary Materials Science, Multidisciplinary Spectroscopy

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Abstract

This study proposes a method for measuring color differences in rock samples, dividing rock images into color profiles using image processing and analysis techniques, and evaluating color differences between rock samples.

Constituent rocks of Cultural Heritage monuments and buildings are of mixed mineral compositions. For materials with homogeneous color properties, colorimetric evaluation is a well-established task. The colorimetric similarity of heterogeneous surfaces is difficult to measure due to the uneven distribution of minerals with different colors. The present work proposes a methodology for color difference calculation, exemplified on granite samples. The methodology proposed includes a technique to divide the rock images into color profiles using multivariate analysis and clustering. The differences between rock samples are evaluated (i) in average color profile distances, (ii) in the tone difference, and (iii) in the color profile distribution on the surface. The method proposed is appropriate for in-situ measurements using widely available digital imaging. (c) 2023 The Author(s). Published by Elsevier Masson SAS on behalf of Consiglio Nazionale delle Ricerche (CNR). This is an open access article under the CC BY license ( http://creativecommons.org/licenses/by/4.0/ )

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