Estimation of the Precision of a Structured Light System in Oil Paintings on Canvas.

Juan V Sánchez-Pérez,Fernando Buchón-Moragues,David Sánchez-Jiménez,José M Bravo

doi:10.3390/s19224966

Juan V Sánchez-Pérez, Fernando Buchón-Moragues + Show 2 more

Open Access

https://doi.org/10.3390/s19224966

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Abstract

The conservation and authentication of pictorial artworks is considered an important part of the preservation of cultural heritage. The use of non-destructive testing allows the obtention of accurate information about the state of pictorial artworks without direct contact between the equipment used and the sample. In particular, the use of this kind of technology is recommended in obtaining three-dimensional surface digital models, as it provides high-resolution information that constitutes a kind of fingerprint of the samples. In the case of pictorial artworks with some kind of surface relief, one of the most useful technologies is structured light (SL). In this paper, the minimum difference in height that can be distinguished with this technology was estimated, establishing experimentally both the error committed in the measurement process and the precision in the use of this technology. This study focused on the case of oil paintings on canvas and developed a low-cost system to ensure its wide use.

Highlights

Pictorial artworks are a fundamental part of cultural heritage and, a great effort must be made to ensure their durability, protecting them from damage caused by external agents such as temperature, humidity, and different kinds of pollution
This second step gives information about the experimental repeatability of the process, since it allows us to establish the percentage of similarity between two 3DSDMs of the same pictorial artwork obtained on different dates
Structured light allows for the obtention of three-dimensional surface digital models (3DSDM) which provide geometrical information about the surface of the pictorial artworks with high precision in an easy and economical way

Summary

Introduction

Pictorial artworks are a fundamental part of cultural heritage and, a great effort must be made to ensure their durability, protecting them from damage caused by external agents such as temperature, humidity, and different kinds of pollution. The need for preventive conservation of this kind of artwork becomes a crucial factor, with continuous monitoring or follow-up of environmental temperature and humidity. These measures should be supported by adequate and accurate documentation and surveying actions in order to continuously check the conservation state of the pictorial artworks ensuring, at the same time, their authenticity. To obtain this documentation, several technologies, usually called non-destructive testing (NDT), allow the analysis of pictorial artworks avoiding direct contact between the sample and the instruments used.

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