Abstract
Today, with quality becoming increasingly important, each product requires three-dimensional in-line quality control. On the other hand, the 3D reconstruction of transparent objects is a very difficult problem in computer vision due to transparency and specularity of the surface. This paper proposes a new method, called Scanning From Heating (SFH), to determine the surface shape of transparent objects using laser surface heating and thermal imaging. Furthermore, the application to transparent glass is discussed and results on different surface shapes are presented.
Highlights
Many practical tasks in industry, such as automatic inspection or robot vision, often require scanning of three-dimensional shapes with non-contact techniques
We present a new approach allowing a 3D reconstruction of a given transparent object
The Scanning From Heating (SFH) method can be applied to glass objects with negligible losses
Summary
Many practical tasks in industry, such as automatic inspection or robot vision, often require scanning of three-dimensional shapes with non-contact techniques. Knowing the internal and external parameters of the acquisition system, the world coordinates are obtained This process is repeated for several points by moving the object to recover the surface shape of the transparent object. A good review of 3D model acquisition techniques can be found in [8] Most of these methods are designed to obtain the shape of opaque surfaces and are based on analysis of the diffuse (body) reflection component of an objects surface. These techniques cannot extract models of transparent objects; such objects have only specular (surface) reflection and refraction. The following section presents SFH, a new approach to recover the 3D surface shape of transparent objects, and discusses the application of the method to glass
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