Jean-Marie Favreau

Jean-Marie Favreau
Université Clermont Auvergne | Univ BPC · LIMOS Laboratoire d’Informatique, de Modélisation et d’Optimisation des Systèmes

PhD

About

33
Publications
3,013
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121
Citations
Citations since 2017
11 Research Items
60 Citations
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Publications

Publications (33)
Article
Full-text available
Crossing an intersection is a challenge for visually impaired people. While tactile maps can be a medium for appropriating this complex space, they benefit from being complemented by audio information. In this paper we propose a data model to describe an intersection, the paths that allow to cross it, and their accessibility attributes. We also pre...
Article
Methods to measure physical activity and sedentary behaviors typically quantify the amount of time devoted to these activities. Among patients with chronic diseases, these methods can provide interesting behavioral information, but generally do not capture detailed body motion and fine movement behaviors. Fine detection of motion may provide additi...
Preprint
UNSTRUCTURED Methods to measure physical activity and sedentary behaviors typically quantify the amount of time devoted to these activities. Among patients with chronic diseases, these methods can provide interesting behavioral information, but generally do not capture detailed body motion and fine movement behaviors. Fine detection of motion may p...
Article
A perfect maze is a maze where any two cells can be joined by a unique path. In the literature, there exist eleven maze generation algorithms as compiled by Buck in 2015 in his book “Mazes for Programmers”. Each algorithm creates mazes differently. Our aim is to analyze how perfect mazes are generated. For this, we use the simple measures introduce...
Article
Full-text available
Les cartes tactiles photoréalistes sont un des outils mobilisés par les personnes en situation de déficience visuelle pour appréhender leur environnement urbain proche, notamment dans le cadre de la mobilité, pour la traversée de carrefours par exemple. Ces cartes sont aujourd’hui principalement fabriquées artisanalement. Dans cet article, nous pro...
Preprint
Full-text available
Pattern analysis is a wide domain that has wide applicability in many fields. In fact, texture analysis is one of those fields, since the texture is defined as a set of repetitive or quasi-repetitive patterns. Despite its importance in analyzing 3D meshes, geometric texture analysis is less studied by geometry processing community. This paper prese...
Article
Tactile maps are essential tools for visually impaired people to comprehend space and to support the simple pedestrian trips made difficult by their disability. Tactile maps are created manually and printed by specialists, and it takes a large amount of time to create a new one, which prevents using them on demand for everyday use. As a consequence...
Chapter
Mesh segmentation and semantic annotation are used as preprocessing steps for many applications, including shape retrieval, mesh abstraction, and adaptive simplification. In current practice, these two steps are done sequentially: a purely geometrical analysis is employed to extract the relevant parts, and then these parts are annotated. We introdu...
Article
Full-text available
Terrestrial Laser Scanning (TLS) systems have gained increasing popularity in the forestry domain and are today widely used for the automatic measurement of forest inventory attributes. Nevertheless, to the best of our knowledge the problem of tree species recognition from TLS data has received very little attention from the scientific community. I...
Article
Full-text available
Mesh segmentation and semantic annotation are used as preprocessingsteps for many applications, including shape retrieval, mesh abstraction, and adap-tive simplification. In current practice, these two steps are done sequentially: apurely geometrical analysis is employed to extract the relevant parts, and then theseparts are annotated. We introduce...
Article
Full-text available
The main purpose of this work is to determine the exact maximum number of pixels (a bi-dimensional sequence of unit squares tiling a plane) that a rectifiable curve of given length l can cross. In other words, given l∈R, we provide the value N(l) of the maximal cardinality of the digital cover of a rectifiable curve of length l. The optimal curves...
Conference Paper
Full-text available
Mesh segmentation and annotation using semantics has received an increased interest with the recent democratisation of 3D reconstruction methods. The common approach is to perform this task in two steps, by first segmenting the mesh and then annotating it. However, this approach does not allow one part to take advantage of the other. In image proce...
Conference Paper
Full-text available
Phase-Shift Profilometry (PSP) provides a means for dense high-quality surface scanning. However it imposes a staticity constraint: The scene is required to remain still during the acquisition of multiple images. PSP is also not applicable to dynamic scenes. On the other hand, there exist active stereo techniques which overcome these constraints bu...
Conference Paper
Full-text available
La profilométrie par déphasage est une méthode éprouvée pour reconstruire des surfaces de manière dense et pré- cise. Par contre la scène doit rester immobile pendant l’ac- quisition d’une séquence de plusieurs images. De plus, il existe des méthodes de stéréo active qui s’affranchissent de la contrainte d’immobilité de la scène mais qui imposent d’...
Article
Magnetic resonance (MR) provides a non-invasive way to investigate changes in the brain resulting from aging or neurodegenerative disorders such as Alzheimer's disease (AD). Performing accurate analysis for population studies is challenging because of the interindividual anatomical variability. A large set of tools is found to perform studies of br...
Article
Subdividing surfaces into cylinders is a significant question in various applications. Even if specific approaches have been described in several domains, most of the time topological properties are not explicitly handled, and the segmentation remains mainly driven by geometry. We present here an original approach to describe the topological and co...
Article
Brain surfaces provide a reliable representation for cortical mapping. The construction of correct surfaces from magnetic resonance images (MRI) segmentation is a challenging task, especially when genus zero surfaces are required for further processing such as parameterization, partial inflation and registration. The generation of such surfaces has...
Article
Full-text available
Abstract We present a framework to describe tiling of triangulated surfaces, possibly with boundaries. The M-tiles introduced by our framework may be home- omorphic to a disc or not, and capture both the tiles’ shape and the geo- metrical and non-trivial topological information of the original mesh. Some tiling algorithms using a cutting scheme are...
Article
Full-text available
The amount of data available to describe the geometry of a 3D object is ever increasing, and therefore ways to efficiently process it are essential. In this dissertation, we present a collection of tools for surface manipulation that exploit both their geometric and topological properties. First we describe some classical results of topology, the f...
Article
Full-text available
A flattening map of a part of the cortical surface is a useful tool for the visualiza- tion and for the understanding of the structures' distribution onto the surface. We previously demonstrate that such a mapping is a practical visualization tool for many information (4). In this approach, a topological preprocessing step is needed to be able to m...
Article
Full-text available
Alors que l'on observe une disponibilité croissante de données décrivant des objets 3D, il semble essentiel de disposer de moyens de traitement efficaces de ces derniers. Ainsi, nous présentons dans ce mémoire un ensemble d'outils de manipulation de surfaces, qui exploitent à la fois leurs propriétés géométriques et topologiques. Après avoir décrit...
Conference Paper
Full-text available
Electric chronic stimulation of the human motor cortex (ECSM) has been reported to alleviate chronic severe pain. However the mechanism of action of ECSM is still hypo- thetical. This is due mainly to the poor knowledge of, 1) the electric diffusion through the multiple structures beneath the epidural contacts (i.e. dura matter, cerebrospinal fluid...
Article
Full-text available
Electric chronic stimulation of the human motor cortex (ECSM) has been reported to alleviate chronic severe pain. However the mechanism of action of ECSM is still hypothetical. This is due mainly to the poor knowledge of, 1) the electric diffusion through the multiple structures beneath the epidural contacts (i.e. dura matter, cerebrospinal fluid s...
Chapter
Full-text available
In this paper we report on some research activities in the ATLAS team in Nantes and the GOOD OLD AI research group in Belgrade in the domain of model-based engineering. We start from the idea that a convenient organization of various technical spaces in three “metamodeling” layers offers a convenient working environment. The main message of this pa...
Article
Full-text available
Un des objectifs de la neuroimagerie est de réaliser l'étude des structures cérébrales de sujets sains ou pathologiques. La grande variabilité des structures nécessite la mise en place de méthodes d'études spécifiques, souvent abordées par le biais de l'Imagerie par Résonance Magnétique (IRM). L'étude du sillon calcarin, élément anatomique notable...
Article
Full-text available
Ordering a set of 3D surfaces according to how de-formed they are is a non-trivial problem, particularly when the reference "undeformed" surface is unknown. Given a 3D point cloud, in this work we describe a method to es-timate its degree of deformation (or how bent a surface is with respect to some rest shape) by estimating the local dis-tortion u...
Article
In this paper we tackle the problem of mapping a sur- face acquired from a real object onto a piece of the plane, taking into account the topological and geo- metrical properties of the surface, as well as the speci- city of low-resolution acquisitions. We rst describe the general background of surfaces unfolding and cut- ting. We then introduce th...
Article
Mapping a given surface onto a piece of the plane is an usual problem, and conformal mappings with border free approaches are classical as non-distorting methods. However, algorithms of this category are only able to produce a mapping from a surface topo- logically equivalent to a disc. In the general case, a topological cutting is thus required. T...

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Projects

Projects (2)
Project
This project is about the use of map design techniques to make interactive tactile maps for visually impaired people. I am particularly interested in the use of abstraction, generalisation, or schematisation techniques, to adapt geographic data to tactile graphics constraints. Most of the work on this topic is done within the ANR ACTIVmap project.
Archived project