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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

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

Pedestrian Detection by Range Imaging

Hügli, Heinz ; Zamofing, Thierry

In: Proceedings. Conference on Computer Vision Theory and Applications (VISAPP), 2007, p. 1-5

Remote detection by camera offers a versatile means for recording people activities. Relying principally on changes in video images, the method tends to fail in presence of shadows and illumination changes. This paper explores a possible remedy to these problems by using range cameras instead of conventional video cameras. As range is an intrinsic measure of object geometry, it is basically not...

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...