Determining properties of materials by using thermal imaging

Claude L. Caillas; Thierry Porcher

doi:10.1117/12.131408

1 November 1992 Determining properties of materials by using thermal imaging

Claude L. Caillas, Thierry Porcher

Proceedings Volume 1818, Visual Communications and Image Processing '92; (1992) https://doi.org/10.1117/12.131408
Event: Applications in Optical Science and Engineering, 1992, Boston, MA, United States

Abstract

One of the important issues in low level vision consists in recovering properties of materials from images. This paper presents a physical model that describes how planar and horizontal surfaces appear in thermal images according to reflectivity, emissivity and thermal inertia to materials. A numerical algorithm, taking into account meteorological parameters, is presented in order to calculate the temperature of surfaces as a function of physical properties of materials. The calculation of the temperature is performed for every possible combination of material properties. We then use a least square fitting method for matching modeled and experimental temperature which leads to material properties determination. Applying this method to an experimental scene composed of several kinds of sand lead to reasonable quantitative results. Although reasonable, these results are not perfectly reliable due to inevitable assumptions of the model. From there, we argue that one can derive qualitative results that are more reliable than quantitative ones.

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Claude L. Caillas and Thierry Porcher "Determining properties of materials by using thermal imaging", Proc. SPIE 1818, Visual Communications and Image Processing '92, (1 November 1992); https://doi.org/10.1117/12.131408

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KEYWORDS

Atmospheric modeling

Thermography

Gallium

Image processing

Visual process modeling

Reflectivity

Solar radiation models

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