Thèse de doctorat : Université de Neuchâtel, 2009 ; Th. 2120.
Cette thèse est une contribution au champ vaste et dynamique de la vision 3D. Le travail présenté s’intéresse au rôle joué par les algorithmes de traitement d’image dans des systèmes de vision 3D spécifiques ainsi que dans des applications novatrices. Deux systèmes d’imagerie 3D très différents sont considérés : un microscope 3D basé sur le principe depth from focus, et...
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In: Two- and Three-Dimensional Methods for Inspection and Metrology IV (Proceedings of SPIE), 2006, vol. 6382, no. 10, p. 638209- 638216
The paper provides considerations relative to the application of 3D vision methods and presents some lessons learnt in this respect by presenting four 3D vision tasks and discussing the selection of vision sensing devices meant to solving the task. After a short reminder of 3D vision methods of interest for optical range imaging for microvision and macrovision applications, the paper enumerates...
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In: Proceedings. Conference Optical 3-D Measurement Techniques, 2007, p. 1-8
3D time-of-flight cameras may suffer from false depth readings caused by light scattering. In order to reduce such scattering artifacts, a scattering compensation procedure is proposed. Assuming a space invariant point spread function as a model for the scattering leads to a solution in a form of a deconvolution scheme.The improvemen tbrought by scattering compensation, as well as the...
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In: Proceedings. Workshop on Camera Calibration Methods for Computer Vision Systems – (CCMVS), 2007, p. 1-12
3D images from time-of-flight cameras may suffer from false depth readings caused by light scattering. In order to reduce such scattering artifacts, a scattering compensation procedure is proposed. First, scattering is analysed and expressed as a linear transform of a complex image. Then, a simple scattering model is formulated. Assuming a space invariant point spread function as a model for the...
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In: Two- and Three-Dimensional Methods for Inspection and Metrology V (Proceedings of SPIE), 2007, vol. 6762, no. 67620H, p. 1-10
Recent time-of-flight (TOF) cameras allow for real-time acquisition of range maps with good performance. However, the accuracy of the measured range map may be limited by secondary light reflections. Specifically, the range measurement is affected by scattering, which consists in parasitic signals caused by multiple reflections inside the camera device. Scattering, which is particularly strong in...
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In: Two- and Three-Dimensional Methods for Inspection and Metrology IV (Proceedings of SPIE), 2008, vol. 6382, no. 63820J, p. 1-11
Machine vision plays an important role in automated assembly. However, present vision systems are not adequate for robot control in an assembly environment where individual components have sizes in the range of 1 to 100 micrometers, since current systems do not provide sufficient resolution in the whole workspace when they are fixed, and they are too bulky to be brought close enough to the...
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