Sebastien Mondet

Adaptive Modeling and Distribution of Large Natural Scenes

Supervisor(s) and Committee member(s): Mathias Paulin (Thesis Director), Geraldine Morin (Thesis Advisor), Romulus Grigoras (Thesis Advisor), Wei Tsang Ooi (Thesis Examiner), Stefanie Hahmann (Thesis Reviewer), Eckehard Steinbach (Thesis Reviewer)


ISBN: French National Thesis Number: 2009INPT026H

This thesis deals with the modeling and the interactive streaming of large natural 3D scenes. We aim at providing techniques to allow the remote walkthrough of users in a natural 3D scene ensuring botanical coherency and interactivity.

First, we provide a compact and progressive representation for botanically realistic plant models. The topological structure and the geometry of the plants are represented by generalized cylinders. We provide a multiresolution compression scheme, based on standardization and instantiation, on difference-based decorrelation, and on entropy coding.

Then, we study efficient transmission of these 3D objects. The proposed packetization scheme works for any multiresolution 3D representation. We validate our packetization scheme with extensive experiments over a WAN (Wide Area Network), with and without congestion control (Datagram Congestion Control Protocol).

Finally, we address issues on streaming at the scene-level. We optimize the viewpoint culling requests on server-side by providing an adapted datastructure and we prepare the ground for our further work on scalability and deployment of distributed 3D streaming systems.

The thesis was part of the NatSim French research project (Natural Simulations) and benefited from a collaboration with the National University of Singapore (Cheng Wei and prof. Wei Tsang Ooi).

VORTEX (IRIT / Univ. of Toulouse)


VORTEX is a dynamic multimedia group at IRIT (Computer Science Research Lab of Toulouse). Our research efforts on visual objects, real or virtual, span a wide range from still images to videos, 2D and 3D scenes etc. We design and develop methods, models and tools to deal with visual objects (real, virtual or mixed) in an adaptive manner. The aim is to adapt their use according to user features, applications, context. For this, instead of developing several models we focus on meta-models or a multi form models (a multi model approach) in order to enhance their individual strength and lessen their drawbacks.

A major research theme is adaptive transmission of large 3D scenes. VORTEX's researcher work on the acquisition and creation of rich 3D content, on the production of progressive, scalable models and also on the transmission and progressive rendering on heterogeneous terminals, from high-end desktop PCs to low-end, mobile devices. Progressive transmission and rendering on a mobile terminal has been showcased via a demo at ACM Multimedia 2009.

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