3D Thermal Imaging System with Decoupled Acquisition for Industrial and Cultural Heritage Applications

Ivo Campione,Francesca Lucchi,Nicola Santopuoli,Leonardo Seccia

doi:10.3390/app10030828

Ivo Campione, Francesca Lucchi + Show 2 more

Open Access

https://doi.org/10.3390/app10030828

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Abstract

Three-dimensional thermography is a recent technique—with various fields of application—that consists of combining thermography with 3D spatial data in order to obtain 3D thermograms, high information objects that allow one to overcome some limitations of 2D thermograms, to enhance the thermal monitoring and the detection of abnormalities. In this paper we present an integration methodology that can be applied to merge data acquired from a generic thermal camera and a generic laser scanner, and has the peculiarity of keeping the two devices completely decoupled and independent, so that thermal and geometrical data can be acquired at different times and no rigid link is needed between the two devices. In this way, the stand-alone capability of each device is not affected, and the data fusion is applied only when necessary. In the second part, the real effectiveness of our approach is tested on a 3D-printed object properly designed. Furthermore, one example of an application of our methodology in the cultural heritage field is presented, with an eye to preservation and restoration: the integration is applied to a marble statue called Madonna with the Child, a fine work of the Florentine sculptor Agostino di Duccio (1418–1481). The results suggest that the method can be successfully applicable to a large set of scenarios. However, additional tests are needed to improve the robustness.

Highlights

All bodies at temperature above absolute zero (0 K) emit electromagnetic radiation
If the temperature of a body has the same magnitude as the ambient temperature, the emission is mainly relegated to the infrared (IR) range of the spectrum and can be sensed and displayed by a thermal camera as a false-color image, called a thermogram
Since our automatic method does concept of homologous points, the evaluation of its accuracy was not exploit the concept of homologous points, the evaluation made by a comparison with the extrinsic parameters obtained by the of its accuracy was made by a comparison with the extrinsic parameters

Summary

Introduction

If the temperature of a body has the same magnitude as the ambient temperature, the emission is mainly relegated to the infrared (IR) range of the spectrum and can be sensed and displayed by a thermal camera as a false-color image, called a thermogram. Infrared thermography is a non-invasive (non-contact and non-destructive) imaging method, which makes it a widely applicable technique. It has a vast range of applications in research and industry, building and infrastructure, electrical installation inspection, microsystems engineering, and in biology, medicine, life sciences and cultural heritage [1,2].

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