“Scanning from Heating” and “Shape from Fluorescence”: Two Non-Conventional Imaging Systems for 3D Digitization of Transparent Objects

“Scanning from Heating” and “Shape from Fluorescence”: Two Non-Conventional Imaging Systems for 3D Digitization of Transparent Objects

Fabrice Mériaudeau (Université de Bourgogne, France), R. Rantoson (Université de Bourgogne, France), G. Eren (Université de Bourgogne, France), L. Sanchez-Sécades (Université de Bourgogne, France), O. Aubreton (Université de Bourgogne, France), A. Bajard (Université de Bourgogne, France), D. Fofi (Université de Bourgogne, France), I. Mohammed (Université de Bourgogne, France), O. Morel (Université de Bourgogne, France), C. Stolz (Université de Bourgogne, France) and F. Truchetet (Université de Bourgogne, France)
Copyright: © 2012 |Pages: 15
DOI: 10.4018/978-1-61350-326-3.ch012

Abstract

3D surface acquisition is a subject which has been studied to a large extent. A significant number of techniques for acquiring shape have been proposed, and a wide range of commercial solutions are available. Nevertheless, today’s systems still have difficulties when digitizing objects with non-Lambertian surfaces in the visible light spectrum, as is the case of transparent, semi-transparent or highly reflective materials (e.g. glass, crystals, some plastics and shiny metals). In this chapter, some of the issues of traditional scanning systems are addressed by considering various approaches using the radioactive properties of materials, the polarization information of the reflected light as well as the generated fluorescence applied to the digitization of transparent object These approaches led to three recent techniques which can be referred as shape from polarization, shape from fluorescence as well as shape from heating (SFH). The two latest approaches will be exposed throughout this chapter.
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Background

In this chapter, we present a new technique for 3D range scanning of transparent objects. 3D range scanning has been investigated for several decades and most of the proposed approaches assume a diffuse reflectance of the object’s surface. The broad literature on the subject is usually divided into active and passive techniques. Active light techniques, whose recent review is proposed by Blais (2004), include laser range scanning, coded structured light systems (Salvi, 2004) and time-of-flight scanners (Bokhabrine 2010) whereas passive techniques are mainly stereovision (Horn, 1986), “shape from optical flow”, shape from shading….or multiview acquisition system (Harvent, 2010).

The further a surface deviates from the Lambertian reflectance assumption, the less accurate standard 3D range scanning techniques become. Figure 1 is an example of a glass bottle scanned by a commercial scanner without any preparation of the sample surface (powder spray) prior digitization.

Figure 1.

(a) glass bottle; and (b) the 3D rendering obtained with a Vi 910 Minolta scanner without prior preparation of the surface

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Coating the object with a powder prior digitization might solve the problem (see Figure 2), on the other hand, this cannot be done in many applications because it involves additional handlings of the objects (coating, cleaning) which include higher processing costs.

Figure 2.

From left to right: (a) specular object, same object after being coated with a powder; (b) transparent object

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