Scanning from heating: 3D shape estimation of transparent objects from local surface heating

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.

Wood fiber orientation assessment based on punctual laser beam excitation: A preliminary study

“…The fiber orientation is assessed through the "Scanning From Heating" (SFH) system initially used for threedimensional digitization of transparent and metallic object [13,14,15,16]. Recently, the system has been extended to detect sub-surface defect on metallic object as well as fiber orientation assessment in carbon composite material [17].…”

3D digitization of metallic specular surfaces using scanning from heating approach

“…Knowing the parameters of the system (which are obtained by a previous calibration), the 3D coordinates of the point are computed using triangulation method. Some results have been presented in [8] and [9]. On Fig.2 (b) we present results obtained with a glass object where the mean error measurement has been estimated to 360 μm.…”

Shape and Reflectance from Scattering in Participating Media

“…However, many objects in the real world do not satisfy this assumption: objects with non-Lambertian surfaces such as mirror-like objects are difficult to measure because such surfaces reflect incident light toward a specific direction and these reflections make difficult to detect point correspondences. There are several approaches [6] to measure non-Lambertian surfaces, such as specular flow [1], methods that use polarization [12], and methods that use known patterns, shape-from-distortion, phase-shifting [3], shape-from-heating [4], and light-path triangulation [8]. These methods require special devices and/or can be applied to only a specific reflection property.…”