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See detail3D Audio Acquisition and Reproduction Systems
Evrard, Marc ULg; André, Cédric ULg; Embrechts, Jean-Jacques ULg et al

Scientific conference (2011, February 23)

This presentation introduces two different research projects dealing with 3D audio for 3D-stereoscopic movies. The first project “3D audio acquisition for real time applications” studies the best method ... [more ▼]

This presentation introduces two different research projects dealing with 3D audio for 3D-stereoscopic movies. The first project “3D audio acquisition for real time applications” studies the best method for acquiring a full 3D audio soundscape on location and for processing it in real-time for further reproduction. The second project “Adding 3D sound to 3D cinema” is aimed towards the study of reproducing a 3D soundscape consistent with the visual content of a 3D-stereoscopic movie. These projects are linked together since they present both ends of the 3D audio chain. They are conducted as part of the “MEDIATIC – 3D MEDIA” project, which concerns the production, the processing, and the exploitation of rich audiovisual content, with a specific focus on 3D video imagery. [less ▲]

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See detail3D XFEM-based modeling of retraction for preoperative image update.
Vigneron, Lara M.; Warfield, Simon K.; Robe, Pierre ULg et al

in Computer aided surgery : official journal of the International Society for Computer Aided Surgery (2011), 16(3), 121-34

Outcomes for neurosurgery patients can be improved by enhancing intraoperative navigation and guidance. Current navigation systems do not accurately account for intraoperative brain deformation. So far ... [more ▼]

Outcomes for neurosurgery patients can be improved by enhancing intraoperative navigation and guidance. Current navigation systems do not accurately account for intraoperative brain deformation. So far, most studies of brain deformation have focused on brain shift, whereas this paper focuses on the brain deformation due to retraction. The heart of our system is a 3D nonrigid registration technique using a biomechanical model driven by the deformations of key surfaces tracked between two intraoperative images. The key surfaces, e.g., the whole-brain region boundary and the lips of the retraction cut, thus deform due to the combination of gravity and retractor deployment. The tissue discontinuity due to retraction is handled via the eXtended Finite Element Method (XFEM), which has the appealing feature of being able to handle arbitrarily shaped discontinuity without any remeshing. Our approach is shown to significantly improve the alignment of intraoperative MRI. [less ▲]

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See detailDesign of the on-board computer of OUFTI-1 CubeSat
De Dijcker, S.; Crosset, N.; Verly, Jacques ULg et al

Conference (2011)

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See detailCubeSat Activities at the University of Liège
Denis, Amandine ULg; Pisane, Jonathan ULg; Verly, Jacques ULg et al

Conference (2011)

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See detailAdding 3D Sound to 3D Cinema: Identification and Evaluation of Different Reproduction Techniques
André, Cédric ULg; Embrechts, Jean-Jacques ULg; Verly, Jacques ULg

in Audio Language and Image Processing (ICALIP), 2010 International Conference on (2010, November 24)

Very little research has been conducted so far into the general problem of producing a 3D soundscape consistent with the visual content of a 3D-stereoscopic movie. First, the following 3D sound ... [more ▼]

Very little research has been conducted so far into the general problem of producing a 3D soundscape consistent with the visual content of a 3D-stereoscopic movie. First, the following 3D sound reproduction techniques are reviewed: Vector Base Amplitude Panning (VBAP), binaural and transaural techniques, Wave Field Synthesis (WFS) and Ambisonics. Second, the new challenges of 3D cinema are introduced. Third, we reconsider each 3D audio technique in the light of these challenges. We find that, at least in theory, a completely personalized soundscape is needed and that, due to various technical reasons, only binaural reproduction through headphones is able to accurately produce a 3D soundscape consistent with a 3D-stereo movie in a theater environment. [less ▲]

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See detailEnhanced FEM-based Modeling of Brain Shift Deformation in Image-Guided Neurosurgery
Vigneron, Lara M.; Boman, Romain ULg; Ponthot, Jean-Philippe ULg et al

in Journal of Computational & Applied Mathematics (2010), 234

We consider the problem of improving outcomes for neurosurgery patients by enhancing intraoperative navigation and guidance. Current navigation systems do not accurately account for intraoperative brain ... [more ▼]

We consider the problem of improving outcomes for neurosurgery patients by enhancing intraoperative navigation and guidance. Current navigation systems do not accurately account for intraoperative brain deformation. We focus on the brain shift deformation that occurs just after the opening of the skull and dura. The heart of our system is a nonrigid registration technique using a biomechanical model. We specifically work on two axes: the representation of the structures in the biomechanical model and the evaluation of the surface landmark displacement fields between intraoperative MR images. Using the modified Hausdorff distance as an image similarity measure, we demonstrate that our approach significantly improves the alignment of the intraoperative images. ' 2009 Elsevier B.V. All rights reserved. [less ▲]

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See detailA platform for the fast interpretation of movements and localization of users in 3D applications driven by a range camera
Pierard, Sébastien ULg; Pierlot, Vincent ULg; Barnich, Olivier ULg et al

in Proceedings of the 3DTV Conference (2010, June)

Interactivity is one of the key challenges for immersive applications like gaming. Manufacturers have been working towards interfaces that are driven by a device (e.g. a Wiimote) or interfaces that are ... [more ▼]

Interactivity is one of the key challenges for immersive applications like gaming. Manufacturers have been working towards interfaces that are driven by a device (e.g. a Wiimote) or interfaces that are controlled by a camera with a subsequent computer vision module. Both approaches have unique advantages, but they do not permit to localize users in the scene with an appropriate accuracy. Therefore, we propose to use both a range camera and accurate range sensors to enable the interpretation of movements. This paper describes a platform that uses a range camera to acquire the silhouettes of users, regardless of illumination, and to improve the pose recovery with range information after some image processing steps. In addition, to circumvent the difficult process of calibration required to map range values to physical distances, we complete the system with several range laser sensors. These sensors are located in a horizontal plane, and measure distances up to a few centimeters. We combine all these measurements to obtain a localization map, used to locate users in the scene at a negligible computational cost. Our method fills a gap in 3D applications that requires absolute positions. [less ▲]

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See detailPassive target classification based on low-frequency bistatic backscattering coefficients
Pisane, Jonathan ULg; Lesturgie, Marc; Verly, Jacques ULg

Conference (2010, June)

In this paper, we describe a new automatic target recognition method for classifying targets according to their bistatic backscattering coefficients. The classification model is based on the construction of ... [more ▼]

In this paper, we describe a new automatic target recognition method for classifying targets according to their bistatic backscattering coefficients. The classification model is based on the construction of subspaces, one per target class. Results show an overall correct classification rate of about 83%, indicating that our method seems to be valid. Further improvements of the algorithm are also discussed. [less ▲]

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See detailRadar Classification based on Extra-Trees
Pisane, Jonathan ULg; Marée, Raphaël ULg; Wehenkel, Louis ULg et al

(2010, May 24)

In this paper, we describe a new automatic target recognition algorithm for classifying SAR images based on the PiXiT im- age classifier. It uses randomized sub-windows extraction and extremely randomized ... [more ▼]

In this paper, we describe a new automatic target recognition algorithm for classifying SAR images based on the PiXiT im- age classifier. It uses randomized sub-windows extraction and extremely randomized trees (extra-trees). This approach re- quires very little pre-processing of the images, thereby lim- iting the computational load. It was successfully tested on an extended version of the public standard MSTAR database, that includes targets of interest, false targets, and background clutter. A misclassification rate of about three percent has been achieved. [less ▲]

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See detailLe système de télécommunication du nanosatellite OUFTI-1
Crosset, Nicolas ULg; Marchal, Nicolas; Pisane, Jonathan ULg et al

Scientific conference (2010, March 25)

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See detailFeasibility study of a Software Defined Radio and its adaptation to space
Heukemes, Mirko; Rainaut, Laurent; Denis, Amandine ULg et al

Poster (2010)

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See detailDesign, implementation, and tests of the architecture of the radiocommunication system of the OUFTI-1 CubeSat
Marchal, Nicolas; Broun, Valéry; Denis, Amandine ULg et al

Poster (2010)

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See detailDesign, implementation, and test of a digitally-controlled electrical power supply for the OUFTI-1 nanosatellite
Kolodziej, Marie; Ledent, Philippe; Thirion, Pierre et al

Poster (2010)

Detailed reference viewed: 20 (1 ULg)