ma tete

Jean-Dominique Gascuel

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MAVERICK
INRIA Rhône-Alpes
655, avenue de l'Europe
38334 Saint Ismier Cedex
FRANCE
Phone:(+33) 4 76 61 54 25
Fax:(+33) 4 76 61 54 40
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Research

Publications

Here's a list of my 6 last papers:

2016

Conference papers

auteur
Beibei Wang, Jean-Dominique Gascuel, Nicolas Holzschuch
titre
Point-Based Light Transport for Participating Media with Refractive Boundaries
article
EGSR2016 EI&I, Jun 2016, Dublin, Ireland. 2016
resume
Illumination effects in translucent materials are a combination of several physical phenomena: absorption and scattering inside the material, refraction at its surface. Because refraction can focus light deep inside the material, where it will be scattered, practical illumination simulation inside translucent materials is difficult. In this paper, we present an a Point-Based Global Illumination method for light transport on translucent materials with refractive boundaries. We start by placing volume light samples inside the translucent material and organising them into a spatial hierarchy. At rendering, we gather light from these samples for each camera ray. We compute separately the samples contributions to single, double and multiple scattering, and add them. Our approach provides high-quality results, comparable to the state of the art, with significant speed-ups (from 9× to 60× depending on scene complexity) and a much smaller memory footprint.
Accès au texte intégral et bibtex
https://hal.inria.fr/hal-01327239/file/pbgiscattering.pdf BibTex

2013

Journal articles

armadillo-ssi-albedo-full.png
auteur
Nicolas Holzschuch, Jean-Dominique Gascuel
titre
Double- and Multiple-scattering Effects in Translucent Materials
article
IEEE Computer Graphics and Applications, Institute of Electrical and Electronics Engineers, 2013, Special Issue on Scattering: Acquisition, Modeling and rendering, 33 (3), pp.66-76. <10.1109/MCG.2013.19>
resume
Some materials, such as coffee, milk or marble, have a soft translucent aspect because of sub-surface scattering: light enters them, is scattered several times inside before leaving in a different place. A full representation of sub-surface scattering effects in illumination simulation is computationally expensive. The main difficult comes from multiple scattering events: the high number of events increases the uncertainty on the result, forcing us to allocate more time for the computations. In this paper, we show that there is a strong correlation between the surface effects of multiple scattering inside the material and the effects after just two scatter events. This knowledge will help in accelerating multiple scattering effects. We exploit this knowledge to provide a model and implementation for fast computation of double-scattering events, using a precomputed density function stored in a compact way.
DOI
DOI : 10.1109/MCG.2013.19
Accès au texte intégral et bibtex
https://hal.inria.fr/hal-00760054/file/practical_bssrdf.pdf BibTex

Conference papers

auteur
Olivier Martin, Jean-Dominique Gascuel, Henri Payno, Sebastien Schmerber
titre
Flexibility of sensorimotor integration in visual virtual immersion. Case of vestibular patients
article
15ème Congrès international de l'Association des Chercheurs en Activités Physiques et Sportives (ACAPS), Oct 2013, Grenoble, France. 2013
Accès au bibtex
BibTex

2012

Journal articles

auteur
Jacques Lemordant, Jean-Dominique Gascuel, Isabelle Bellin
titre
L'émergence de la réalité augmentée, à la frontière du réel et du virtuel
article
Collection "20 ans d'avancées et de perspectives en sciences du numérique", INRIA, 2012, 3 p
resume
La simulation interactive d'environnements réels ou imaginaires se développe depuis les années 1980. D'abord l'apanage des jeux vidéo, elle est désormais utilisée dans des simulateurs de toutes sortes (camion, super-tanker, train, avion), les visites de sites virtuels (musées, sites archéologiques) ou pour soigner (phobies, troubles de l'équilibre, etc.). Outre les progrès en matière d'images de synthèse, indispensables pour ces applications, c'est la miniaturisation qui a révolutionné les usages.
Accès au texte intégral et bibtex
https://hal.inria.fr/hal-00813184/file/L_A_mergence_de_la_rA_alitA_augmentA_e_A_la_frontiA_re_du_rA_el_et_du_virtuel.pdf BibTex
teaser_score.png
auteur
Jean-Dominique Gascuel, Henri Payno, Sébastien Schmerber, Olivier Martin
titre
Immersive Virtual Environment for Visuo-Vestibular Therapy: Preliminary Results
article
Journal of CyberTherapy & Rehabilitation, 2012, 5 (2), pp.127
resume
The sense of equilibrium aggregates several interacting cues. On patients with vestibular loss, vision plays a major role. In this study, the goal is to propose a new immersive therapy based on 3D opto-kinetic stimulation. We propose to demonstrate that 3D monoscopic optical flows are an efficient tool to stimulate adaptive postural adjustment. We developed an immersive therapeutic platform that enables to tune the balance task difficulty by managing optic flow speed and gaze anchoring. METHODOLOGY: the immersive sessions proposed to vestibular areflexic patients are composed of a repetition of dynamic optic flows, with varying speed and presence or not of a gaze anchor. The balance adjustments are recorded by a force plate, and quantified by the length of the center of pressure trajectory. RESULTS: Preliminary analysis shows that (i) Patients report a strong immersion felling in the motion flow, triggering more intense motor response to "fight against fall" than in standard opto-kinetic protocols; (ii) An ANOVA factorial design shows a significant effect of flow speed, session number and gaze anchor impact. CONCLUSION: This study shows that 3D immersive stimulation removes essential limits of traditional opto-kinetic stimulators (limited 2D motions and remaining fixed background cues). Moreover, the immersive optic flow stimulation is an efficient tool to induce balance adaptive reactions in vestibular patients. Hence, such a platform appears to be a powerful therapeutic tool for training and relearning of balance control processes.
Accès au texte intégral et bibtex
https://hal.archives-ouvertes.fr/hal-00690804/file/GASCUEL_JD_word.pdf BibTex

Conference papers

teaser-CHU-G-un-vp-troisQuartDessus.png
auteur
Jean-Dominique Gascuel, Henri Payno, Sebastien Schmerber, Olivier Martin
titre
Immersive Virtual Environment for Visuo-Vestibular Therapy: Preliminary Results
article
Brenda K. Wiederhold and Giuseppe Riva. CYBER17 - 17th Annual CyberPsychology & CyberTherapy Conference, Sep 2012, Bruxelles, Belgium. IOS Press, 181, pp.187-191, 2012, Studies in Health Technology and Informatics; Annual Review of Cybertherapy and Telemedicine 2012. <10.3233/978-1-61499-121-2-187>
resume
The sense of equilibrium aggregates several interacting cues. On patients with vestibular loss, vision plays a major role. In this study, the goal is to propose a new immersive therapy based on 3D opto-kinetic stimulation. We propose to demonstrate that 3D monoscopic optical flows are an efficient tool to stimulate adaptive postural adjustment. We developed an immersive therapeutic platform that enables to tune the balance task difficulty by managing optic flow speed and gaze anchoring. METHODOLOGY: the immersive sessions proposed to vestibular areflexic patients are composed of a repetition of dynamic optic flows, with varying speed and presence or not of a gaze anchor. The balance adjustments are recorded by a force plate, and quantified by the length of the center of pressure trajectory. RESULTS: Preliminary analysis shows that (i) Patients report a strong immersion felling in the motion flow, triggering more intense motor response to "fight against fall" than in standard opto-kinetic protocols; (ii) An ANOVA factorial design shows a significant effect of flow speed, session number and gaze anchor impact. CONCLUSION: This study shows that 3D immersive stimulation removes essential limits of traditional opto-kinetic stimulators (limited 2D motions and remaining fixed background cues). Moreover, the immersive optic flow stimulation is an efficient tool to induce balance adaptive reactions in vestibular patients. Hence, such a platform appears to be a powerful therapeutic tool for training and relearning of balance control processes.
DOI
DOI : 10.3233/978-1-61499-121-2-187
Accès au texte intégral et bibtex
https://hal.inria.fr/hal-00690875/file/cyber17-submitted.pdf BibTex

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Curriculum Vitae

Teaching