Loïca Avanthey

Graduate School of Computer Science and Advanced Technologies | EPITA · Seal (Sense, Explore, Analyse and Learn)

In this article, we present another way to acquire centimetric data using a quad-rotor UAV and the specific tools developed to perform near real time cartography. After setting the context of the UAVs, we will present the design and the realization of our quad-rotor Vertical Take Off and Landing solution and it's capacity for Very High Resolution i...

Tasks such as distinguishing or identifying individual objects of interest require the production of dense local clouds at the scale of these individual objects of interest. Due to the physical and dynamic properties of an underwater environment, the usual dense matching algorithms must be rethought in order to be adaptive. These properties also im...

Close-range remote sensing, and more particularly, its acquisition part that is linked to field robotics, is at the crossroads of many scientific and engineering fields. Thus, it takes time for students to acquire the solid foundations needed before practicing on real systems. Therefore, we are interested in a means that allow students without prer...

In this article, we are interested in the implementation of an open-source low-level architecture (critical system) adapted to agile and easily replicable close-range remote sensing robots operating in multiple evolution domains. After reviewing the existing autopilots responding to these needs, we discuss the available hardware solutions and their...

In this article, we study the interest of PiCam and its possibilities offered for the realization of a light payload (small and inexpensive) in order to perform the 3D reconstruction of dynamic scenes (underwater or aerial) in close-range remote sensing. We see that on these observation scales, movements of the scenes due to flora and fauna cannot...

In this article, we present an educational reform we implemented a few years ago to respond to a marked drop in the success of students entering higher education in computer science. The main objective of our reform is to adapt the teaching methods of Generation X-Y to Generation Y-Z or more. To do this, we propose two approaches. First, to make le...

This poster illustrate the article of the same title published in ISPRS Annals 2020 by L. Avanthey, L. Beaudoin, C. Villard, S. Mellouk and R. Treglia. We study the interest of PiCam and its possibilities offered for the realization of a light payload (small and inexpensive) in order to perform the 3D reconstruction of dynamic scenes (underwater or...

The 3D reconstruction of underwater scenes from overlapping images requires modeling the sensor. While underwater self-calibration gives good results when coupled with multi-view algorithms, calibration or pre-calibration with a pattern is still necessary when scenes are weakly textured or if there are not enough points of view of the same points;...

Pour de nombreuses applications (environnementales, archéologiques, industrielles ou de défense et sécurité par exemple), disposer d'un modèle 3D très haute résolution de zones locales peut être important. Dans cet article, nous nous intéressons à l'obtention de nuages de points 3D dense par reconstruction. Mais les conditions d'acquisition propres...

French: Pour de nombreuses applications industrielles, de défense et sécurité, environnementales ou archéologiques par exemple, disposer d'une reconstruction 3D très haute ré-solution de zones locales peut être très important. Mais les conditions d'acquisition propres au milieu sous-marin (mi-lieu dynamique et hostile, visibilité réduite, pas de GP...

French: Pour de nombreuses applications industrielles, de défense et sécurité, environnementales ou archéologiques par exemple, disposer d’une reconstruction 3D très haute ré- solution de zones locales peut être très important. Mais les conditions d’acquisition propres au milieu sous-marin (mi- lieu dynamique et hostile, visibilité réduite, pas de...

French: L'étude de la biodiversité des écosystèmes et de leur dynamique est un enjeu majeur de notre siècle de transition climatique. Pour cela, il est nécessaire de réaliser un suivi précis de l'évolution des populations, basé sur une cartographie régulière et à haute résolution pour recueillir des informations à l'échelle des individus étudiés. D...

Les dernières années ont montré l'intérêt croissant de la télédétection basse altitude (TBA) pour l'étude de zones na- turelles. Mais au-delà de la problématique d'accès au milieu, la cartographie de ces zones à grande échelle pose de nombreuses contraintes sur la partie capteurs d'acquisition. En effet, ce sont des milieux difficiles pour les algo...

Notre planète est pour l’essentiel recouverte par les mers et les océans, or notre connaissance des fonds marins est très inférieure à celle que nous possédons sur les terres émergées. Dans ce mémoire, nous cherchons à concevoir un système dédié à la cartographie thématique à grande échelle pour obtenir à la demande un nuage de points dense représe...

The recent years have shown a growing interest in low-altitude remote sensing for the study of natural areas. But natural environments lead to many constraints on acquisition sensors, which add to operational and carriers constraints. This article is a feedback on the design of two of these sensors.

L’étude de la biodiversité des écosystèmes et de leur dynamique est un enjeu majeur de notre siècle de transition climatique. Pour cela, il est nécessaire de réaliser un suivi précis de l’évolution des populations, basé sur une cartographie régulière et à haute résolution pour recueillir des informations à l’échelle des individus étudiés. On s’inté...

Les dernières années ont montré l’intérêt croissant de la télédétection basse altitude (TBA) pour l’étude de zones naturelles. Mais au-delà de la problématique d’accès au milieu, la cartographie de ces zones à grande échelle pose de nombreuses contraintes sur la partie capteurs d’acquisition. En effet, ce sont des milieux difficiles pour les algori...

Acquiring dense and high resolution 3D data in operational conditions is a real challenge during exploration of underwater or subaquatic areas for environmental, archaeological, defense and security applications. In order to achieve these goals, the use of small automated robots can be seen as an efficient solution. In this paper, we focus on local...

Mapping is a fundamental tool in the ecosystems studies. It is usually done by field records, but this method consumes a lot of time and resources. Remote sensing is a complementary tool but still need ground truth certification due to the scale factor. We present in this article a concept, the Extended Ground Truth, that try to keep the advantag...

Acquiring 3D very high resolution data in operational conditions is a real challenge in marine coastal areas exploration for environmental, archaeological and defense and security applications. In order to achieve these goals the use of small autonomous robots can be seen as an efficient solution. Because of the complexity of the development of tha...

We consider the following scenario: a swarm of UAVs has a mission and a UAV from it has been captured: is it possible to secure (in a broad sense) the sensitive data and software in such a way as to avoid any information leak in this situation. In this article we study a possible solution using in a complementary way: an embedded secure token (a sm...

The rising capabilities and growing accessibility of recent Unmanned Aerial Systems (UAS) widen the risks of success of a terrorists attack through the current aerial defence systems. We will examine first the complexity of the threats from a single unmanned vehicle, to a team of unmanned vehicles and finally to a swarm of unmanned vehicles (and an...

One of the most important parameters in the estimation of the evolution of global change is the gas composition of the atmosphere and its temporal variation. Amongst the various and complex processes that absorb or produce gases, the biomass burning has very important short and long term effects [1]. Remote sensing plays a key role in monitoring th...

Eager for greater flexibility, and lesser costs, we are often tempted to acquire high-resolution data with home-made acquisition systems. However, this approach cannot benefit from usual tools to tackle problems such as image navigation within a large flow of very high resolution pictures, data completion and image mosaicing of small patches of the...

In the 2005 IGARSS' symposium, we presented the setting up of a data receiving station for METEOSAT SECOND GENERATION (MSG) satellites by undergraduates and we emphasized the pedagogical interest of the project. The experience has been successfully pursued by developing with the undergraduates involved the exploitation of the data received and its...