Université de Neuchâtel

Contributions to image processing algorithms for advanced 3D vision devices

Mure-Dubois, James ; Hügli, Heinz (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2009 ; Th. 2120.

This thesis is a contribution to the wide and steadily evolving field of 3D vision. The presented work focuses on the role played by image processing algorithms employed in specific 3D vision systems and in challenging 3D applications. Two very different 3D imaging systems are considered: a 3D microscope based on the depth from focus principle, and a real-time 3D camera using time-of-flight (TOF)...

Université de Neuchâtel

3D vision methods and selected experiences in micro and macro applications

Hügli, Heinz ; Mure-Dubois, James

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...

Université de Neuchâtel

Time-of-flight imaging of indoor scenes with scattering compensation

Mure-Dubois, James ; Hügli, Heinz

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...

Université de Neuchâtel

Real-time scattering compensation for time-of-flight camera

Hügli, Heinz ; Mure-Dubois, James

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...

Université de Neuchâtel

Optimized scattering compensation for time-of-flight camera

Mure-Dubois, James ; Hügli, Heinz

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...

Université de Neuchâtel

Embedded 3D vision system for automated micro-assembly

Mure-Dubois, James ; Hügli, Heinz

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...