Joachim Pouderoux

Perception4D

Ghost cells are important for distributed memory parallel operations that require neighborhood information, and are required for correctness on the boundaries of local data partitions. Ghost cells are one or more layers of grid cells surrounding the external boundary of the local partition, which are owned by other data partitions. They are used by...

SHAPO • Cross-platform library developed in C++ - based on VTK to build Voronoi meshes from a set of generators/seeds in a closed domain • Developed at Kitware (France) for LANL since 2013 • Binding layers to use the tool in C, Fortran and Python • Works in serial or in parallel (MPI) • Use Shewchuck’s robust predicates • Self-diagnostic (of I/O) &...

A method for the visualization of datasets of curves has been implemented in ParaView. The method is based on performing a PCA (Principal Component Analysis) of the curves; then quantiles and outliers are estimated in the plane defined by the two more relevant components of the PCA; finally this information is reprojected in the original curves spa...

Recent advances in mobile computing allow the users to deal with 3D interactive graphics on handheld computers. Although the computing resources and screen resolutions grow steadily, user interfaces for handheld computers do not change significantly. Consequently, we designed a new 3-DOF interface adapted to the characteristics of handheld computer...

Topographic maps are a common support for geographical information because they have the particularity to portray the relief through a set of contour lines. This topographic feature can be very useful in many context but the automatic extraction of this information is not an easy task, especially because the map contains many other layers which ove...

Engineers and computational scientists often study the behavior of their simulations by repeated solutions with variations in their parameters, which can be for instance boundary values or initial conditions. Through such simulation ensembles, uncertainty in a solution is studied as a function of the various input parameters. Solutions of numerical...

Engineers and computational scientists often study the behavior of their simulations by repeated solutions with variations in their parameters, which can be for instance boundary values or initial conditions. Through such simulation ensembles, uncertainty in a solution is studied as a function of the various input parameters. Solutions of numerical...

Voronoi meshes are polygonal or polyhedral meshes that have properties which are recognized in many scientific fields like computational mechanics, computer graphics or geophysics. SHAPO is a cross-platform C++ software library and toolkit we are developing in the particular context of the implementation of Reconnection-Based ALE[1] family of meth...

A regional reconnection-based arbitrary Lagrangian Eulerian method

As supercomputing moves towards exascale, scientists, engineers and medical researchers will look for efficient and cost effective ways to enable data analysis and visualization for the products of their computational efforts. The ‘exa’ metric prefix stands for quintillion, and the proposed exascale computers would approximately perform as many ope...

Voronoi meshes are involved in numerous applications from astrophysics to biology or computer graphics. Their properties are especially widely used in geophysical flows and computational fluid dynamics. Our main interest in Voronoi meshes related to Reconnection-Based ALE family of methods introduced in [1]. In this talk we present ShaPo, a cross p...

This talk presents the Open-Source toolkits developed by Kitware for big data analysis.

The understanding of geology and petrophysical properties is necessary to develop deep geothermal projects. However, this knowledge must be shared within the French professional geothermal community to make the exploration process more efficient. Thermo2Pro is designed to fill the gap between the information derived from R&D projects and the author...

Nowadays, 3D visualization is part of our everyday lives and remains an important tool for understanding complex structures, dynamic simulations, and research discoveries. In the meantime, the complexity of the visualization often requires specific hardware, including visualization clusters, as well as dedicated software tools. Several efforts, suc...

The understanding of geology and petrophysical properties is necessary to develop deep geothermal projects. However, this knowledge must be shared within the professional community to be efficient. Thermo2Pro is essentially a Web tool designed to fill the gap between the information derived from R&D projects and the authorities dealing with the dee...

In France, and in many other countries, accessing data for geothermal exploration can be a hard task. This is particularly the case for information coming from research projects. Thermo2Pro is a tool designed to fill the gap between the data and the people needing to use them, especially the professionals from the geothermal sector. They include co...

Augmented reality has been shown to be useful in many application areas such as maintenance skills, urban planning, interior design and entertainment, etc. The development of the mobile augmented reality in these last years is due to the evolution of the technology at various levels: from sensors (GPS, inertial sensor, etc.) to mobile devices (Tabl...

Simulation of large scale seismic wave propagation is an important tool in seismology for efficient strong motion analysis and risk mitigation. Being particularly CPU-consuming, this three-dimensional problem has been early ported on graphics cards to improve the performance by several order of magnitude. Scientific visualization of data produced b...

To increase the input space of mobile devices, the authors developed a proof-of-concept 3D elastic controller that easily adapts to mobile devices. This embedded device improves the completion of high-level interaction tasks such as visualization of large documents and navigation in 3D environments. It also opens new directions for tomorrow's mobil...

Topographic paper maps are a common support for geographical information. In the field of document analysis of this kind of support, this paper proposes an automatic approach to extract and recognize toponyms. We present a technique based on image segmentation and connected component processing. Different filtering stages ensure the consistency of...

Digital terrain models (DTM) allow to represent efficiently the topography of a given geographical area. Those DTM can be issued from a remote acquisition using, for example, embedded radars or from a topographic surveying with a tacheometer. DTM are the thematic context of this thesis which is composed of three parts.\\ In a first part, we take an...

Standard input devices for mobile phones are directional keys and discrete thumb-joysticks. These devices are ded- icated to the discrete GUIs of the phones (eg. scroll lists and small icons arrays). Today, new mobile applications are aris- ing and require adapted interfaces. In particular, the wide- spread of 3D applications will be favored if use...

The applications for handheld computers have evolved from very simple schedulers or note editors to more complex applications where high-level interaction tasks are required. Despite this evolution, the input devices for interaction with handhelds are still limited to a few buttons and styluses associated with sensitive screens.In this paper we foc...

Terrain rendering is an important factor in the rendering of virtual scenes. If they are large and detailed, digital terrains can represent a huge amount of data and therefore of graphical primitives to render in real-time. In this paper we present an efficient technique for out-of-core rendering of pseudo-infinite terrains. The full terrain height...

This paper presents a fast algorithm for smooth digital elevation model interpolation and approximation from scattered elevation data. The global surface is reconstructed by subdividing it into overlapping local subdomains using a perfectly balanced binary tree. In each tree leaf a smooth local surface is reconstructed using radial basis functions....

This sketch presents AutoDEM, a software designed for creating digital terrains from topographic maps.

Un modèle numérique de terrain permet de modéliser une zone géographique et principalement son relief. Les applications pratique de ces modèles sont innombrables. Dans cet article, nous décrivons un processus permettant de créer un modèle numérique de terrain à partir d’une carte topographique couleur numérisée. Nous présentons d’abord des techniqu...

Les modèles numériques de terrains (MNT) permettent de représenter efficacement la topographie d'une zone géographique donnée. Ces MNT peuvent être issus d'une télé acquisition à l'aide de radars embarqués ou de levés manuels sur le terrain à l'aide d'un tachéomètre. Les MNT constituent le contexte thématique de cette thèse qui est composée en troi...