Search results for "Image"

Multi-modal image fusion for small animal studies in in-line PET /3T MRI

2015

Congrès sous l’égide de la Société Française de Génie Biologique et Médical (SFGBM).; National audience; In the framework of small animal multi-modal imaging, the current progression of the IMAPPI project is illustrated by the design of an in-line PET/MRI prototype, coupled to a dedicated multi-resolution registration method allowing the robust fusion of data coming from both modalities. The first results show a good alignment of the data from tumor imaging at the level of the abdomen.

Mise au point d’une méthode de caractérisation morphologique de cultures et d’adventices en vue de modéliser leur aptitude de réponse à la lumière

2017

EASPEGESTAD INRA; La modélisation, et plus particulièrement le modèle de prédiction de flore adventice FLORSYS, nécessite l’acquisition constante de données sur la croissance et la plasticité morphologique d’espèces cultivées et d’adventices. Nous avons mis au point une méthodologie basée sur de l’expérimentation en parcelles jardinées pour quantifier la croissance et la plasticité morphologique des espèces dans des conditions contrastées de lumière. Les données sont obtenues par des mesures de surfaces foliaires, de hauteurs et envergures des plantes, des pesées de biomasse, et par analyse de photographies via les logiciels Matlab et ImageJ. Nous montrerons les résultats pour quelques espè…

Comparaison de la croissance racinaire de trois espèces cultivées

2019

Analyse des mécanismes impliqués dans la détection automatisée des adventices

2017

EASPEGESTADAGROSUP; L’objectif est de développer des systèmes de proxidétection embarqués sur différentes plateformes aérienne (drone) ou terrestre (robot) dédiés, entre autre, à l’identification et la localisation d’adventices pour établir des cartes de présence d'adventices afin de mettre en oeuvre le désherbage chimique localisé. L’étude présente les premiers résultats obtenus par le drone d’AIRINOV dont la problématique est d’étudier le potentiel de l’imagerie aérienne pour la détection d’adventices. Deux approches ont été étudiées.

Approche multi-critère pour la caractérisation des adventices

2022

The objective of this thesis is to develop a way to detect weeds in a field using multispectral images, in order to determine which weeds should be eliminated during the current crop cycle and more particularly at the early stages. The multi-criteria approach focuses on the spatial arrangement, the spec- tral signature, the morphology and the tex- ture of the plants located in the plots. This work proposes a method for selecting the best criteria for optimal discrimination for a given setup. Prior to the extraction of these crite- ria, a set of methods was developed in order to correct the errors of the acquisition de- vice, to precisely detect the vegetation and then to identify within the…

Robotics for weed control: I-Weed Robot for a specific spraying

2012

International audience; To preserve environment for a sustainable agriculture, we explore the development of a new autonomous robot, called I-Weed Robot (Intelligent Weed Robot), which aims at reducing herbicides in crop fields (maize, sunflower...). Using a high precision positioning signal (RTK) to locate the robot in the field, a Kaman filter and a proportional-integral-derivative controller (PID controller) allow adjusting the orientation of the robot depending on a predefined trajectory. As for the spraying system, a camera in front of the mobile platform detects weed plants thanks to an image processing based on a crop/weed discrimination algorithm (Hough Transform). At the back a spr…

Monetary images of celtic people : primitive figures or expressions of a changing society ? : the case of Arveni, Bituriges, Carnutes, Aedui, Lingone…

2011

The study is based on approximately 600 monetary images attributed to Arverni, Bituriges, Carnutes, Aedui, Lingones, Sequani, Parisii, Meldi and Senones. Monetary images form the largest iconographic set provided by the Celts but paradoxically, they are not considered at their fair value in the current research. Indeed, their study is a relatively recent discipline because the Celts left no text allowing their understanding. The different themes of the images relate to religion, society and aristocracy of Iron Age. The multidisciplinary approach (archaeological, literary and artistic) of this work recreates links between monetary images and the celtic society and compleets many areas of stu…

Close-Range Photogrammetric Tools for Epigraphic Surveys

2016

In this article, we present a method to carry out a computerized epigraphic survey of historic stones and their engraved epigraphy. In fact, the preservation of archaeological objects has always been an issue of concern for the research community. On the one hand, the fragility of the objects limits their study. On the other hand, such objects are housed in museums, libraries, and institutions worldwide, locations that significantly limit their accessibility. Different survey methods have been carried out in these attempts to overcome the aforementioned limitations. Among them, the MicMac open source software was used in this work to survey and process the dense correlation of the hieroglyp…

Cartographie de la diversité des sols viticoles de versant par imagerie à haute résolution : contribution à la connaissance des terroirs

2014

The Burgundian vineyard hillslopes (Côte-d’Or, France) exhibit a high diversity of soils resulting from the combination of several natural and anthropogenic factors acting at various spatio-temporal scales. The soil types have major role in viticulture, since they partly determine wine-growing quality. However, soil undergoes important degradation caused by hydric erosion and vineyard management practices. To control this soil heritage for a sustained viticulture in Côte-d’Or, a better knowledge of soil is necessary. The objectives of this work is to characterise vineyard soils and to identify the factors governing their diversity using an interdisciplinary approach crossing geology, geomor…

Déchiffrer les structures du paysage

2012

International audience