Search results for "Image"

Local Distance and Dempster-Dhafer for Multi-Focus Image Fusion

2022

This work proposes a new method of fusion image using Dempster-Shafer theory and local variability (DST-LV). This method takes into account the behaviour of each pixel with its neighbours. It consists in calculating the quadratic distance between the value of the pixel I (x, y) of each point and the value of all the neighbouring pixels. Local variability is used to determine the mass function defined in DempsterShafer theory. The two classes of Dempster-Shafer theory studied are : the fuzzy part and the focused part. The results of the proposed method are significantly better when comparing them to results of other methods.

Multi-Scale Feature Extraction for Vehicle Detection Using Phis-Lbp

2018

International audience; Multi-resolutionobjectdetectionfacesseveraldrawbacksincludingitshighdimensionalityproducedby a richer image representation in different channels or scales. In this paper, we propose a robust and lightweight multi-resolution method for vehicle detection using local binary patterns (LBP) as channel feature. Algorithm acceleration is done using LBP histograms instead of multi-scale feature maps and by extrapolating nearby scales to avoid computing each scale. We produce a feature descriptor capable of reaching a similar precision to other computationally more complex algorithms but reducing its size from 10 to 800 times. Finally, experiments show that our method can obt…

Robotique et imagerie pour le désherbage localisé

2020

National audience; L’agriculture moderne est en train d’évoluer vers des systèmes moins dépendants en pesticides (dont les herbicides restent les pesticides les plus difficiles à réduire) en ayant recours de plus en plus à des outils de précision (capteurs, plateformes mobiles) pour évaluer et prendre en compte la variabilité intra-parcellaire. Dans ce contexte, ces outils se présentent comme des leviers techniques pour une gestion raisonnée des bioagresseurs, et plus particulièrement les adventices. Cela nécessite de caractériser au mieux l’état d’infestation d’une parcelle grâce à des technologies non-invasives et à haut débit d’acquisition comme l’imagerie afin de réaliser un désherbage …

Localisation basée vision à partir de caractéristiques discriminantes issues de données visuelles hétérogènes

2019

Visual-based Localization (VBL) consists in retrieving the location of a visual image within a known space. VBL is involved in several present-day practical applications, such as indoor and outdoor navigation, 3D reconstruction, etc. The main challenge in VBL comes from the fact that the visual input to localize could have been taken at a different time than the reference database. Visual changes may occur on the observed environment during this period of time, especially for outdoor localization. Recent approaches use complementary information in order to address these visually challenging localization scenarios, like geometric information or semantic information. However geometric or sema…

Remote and proximal sensing for precision agriculture and viticulture". Special issue

2021

International audience; Special Issue InformationDear Colleagues,Remote and proximal sensing are the two most common techniques concerning the acquisition of information about an object or any phenomenon without physical contact with the object. Remote sensing is widely tied to the use of satellite, airborne or UAV platforms using multi- or hyperspectral imagery. In terms of proximal sensing, the sensor is close to the object and is installed on platforms ranging from handheld, fixed installations, or robotics and tractor-embedded sensors. The types of sensors range from simple RGB or grey-level-cameras to multispectral and hyperspectral high resoluted imaging systems or even thermographic …

Towards automated and operational forest inventories with T-Lidar

2011

International audience; Forest inventory automation has become a major issue in forestry. The complexity of the segmentation of 3D point cloud is due to mutual occlusion between trees, other vegetation, or branches. That is why, the applications done until now are limited to the estimation of the DBH (Diameter at Breast Height), the tree height and density estimation. Furthermore other parameters could also be detected, such as volume or species of trees (Reulke and Haala) . . . This paper presents an effective approach for automatic detection, isolation of trees and DBH estimation. Tree isolation is achieved using an innovative approach based on a clustering methodology followed by a skele…

A Framework for Mesh Segmentation and Annotation using Ontologies

2015

International audience; 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 processing, some methods are combining segmentation and annotation, but they are not generic and require implementation adjustments or rewritings for each modification of the expert knowledge. In this work, we describe an original framework that mixes segmen-tation and annotation while minimizing the required geometric analysis …

Les joueurs africains rêvent d'Angleterre

2008

Multi-focus image fusion using Laplacian Pyramid technique based on Alpha-Stable filter

2019

International audience

Zwrot kulturowy w badaniach onomastycznych

2015

In the recent years, a turn towards interdisciplinary research in which proper names are presentedas an interpretation of reality and a mirror of historical, political, social and cultural processes has been observed in onomastics. Names can reflect a popular vision of the world presenting its anthropocentric conceptualization reconstructed on the basis of knowledge, beliefs, valuation systems and cultural experiences of people. Thus the cultural analysis of onyms comprises notions of a linguistic image of the world, point of view, profiling, conceptualization and categorization of ideas, valuation, stereotype and prototype, connotation, metaphor and metonymy. Special attention is also paid…