Use of infrared hyperspectral imaging as an aid for paint identification

Abstract

This version is available at https://strathprints.strath.ac.uk/58213/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Strathprints administrator: strathprints@strath.ac.ukThe Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output. This licence permits you to use, share, copy and redistribute the paper in any medium or any format provided that a full citation to the original paper in this journal is given, the use is not for commercial purposes and the paper is not changed in any way. Art authentication is a complicated process that often requires the extensive study of high value objects. Although a series of nondestructive techniques is already available for art scientists, new techniques, extending current possibilities, are still required. In this paper, the use of a novel mid-infrared tunable imager is proposed as an active hyperspectral imaging system for art work analysis. JOURNAL OF SPECTRAL IMAGING JSIThe system provides access to a range of wavelengths in the electromagnetic spectrum (2500-3750 nm) which are otherwise dificult to access using conventional hyperspectral imaging (HSI) equipment. The use of such a tool could be beneicial if applied to the paint classiication problem and could help analysts map the diversity of pigments within a given painting. The performance of this tool is demonstrated and compared with a conventional, off-the-shelf HSI system operating in the near infrared spectral region (900-1700 nm).Various challenges associated with laser-based imaging are demonstrated and solutions to these challenges as well as the results of applying classiication algorithms to datasets captured using both HSI systems are presented. While the conventional HSI system provides data in which more pigments can be accurately classiied, the result of applying the proposed laser-based imaging system demonstrates the validity of this technique for application in art authentication tasks.

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