Search results for "reconstruction 3D"
showing 9 items of 9 documents
Un progetto non realizzato: il Gran Cimitero di Giuseppe Damiani Almeyda. Dai disegni di archivio alla ricostruzione tridimensionale.
2016
L’obiettivo di questo studio è la ricostruzione e l’analisi di un progetto non realizzato: il Gran Cimitero di Giuseppe Damiani Almeyda (1834-1911), a partire dai suoi disegni originali, realizzati a matita, inchiostro e acquerello su cartoncino. Il progetto ha vinto la medaglia d’oro sia alla Prima Mostra Nazionale di Belle Arti di Firenze, nel 1861, sia alla Mostra di Sicilia di Belle Arti, nel 1863. La ricostruzione del modello tridimensionale è servita per dedurre elementi di interpretazione, quali l’impostazione modulare dell’intera composizione, e viste prospettiche, ombreggiate o renderizzate, elaborate cercando rendere visibili gli spazi immaginati nei disegni originali in proiezion…
Polarization stereoscopic imaging prototype
2011
The polarization of light was introduced last ten years ago in the field of imaging system is a physical phenomenon that can be controlled for the purposes of the vision system. As that found in the human eyes, in general the imaging sensors are not under construction which is sensitive to the polarization of light. These properties can be measured by adding optical components on a conventional camera. The purpose of this thesis is to develop an imaging system that is sensitive both to the stereoscopic and to the state of polarization. As well as the visual system on a various of insects in nature such as bees, that are have capability to move in space by extracted relevant information from…
Motion Analysis for Dynamic 3D Scene Reconstruction and Understanding
2017
This thesis studies the problem of dynamic scene 3D reconstruction and understanding using a calibrated 2D-3D camera setup mounted on a mobile platform via the analysis of objects' motions. For static scenes, the sought 3D map reconstruction can be obtained by registering the point cloud sequence. However, with dynamic scenes, we require a prior step of moving object elimination, which yields to the motion detection and segmentation problems. We provide solutions for the two practical scenarios, namely the known and unknown camera motion cases, respectively. When camera motion is unknown, our 3D-SSC and 3D-SMR algorithms segment the moving objects by analysing their 3D feature trajectories.…
Design and modelling a of bimodal camera system
2021
In computer vision, researchers face a challenging concern due to the limited field of view (FoV) when using standard cameras in capturing scenes. This problem of narrow FoV often encountered within applications that involve tasks which are related to the robot vision. Many authors have attempted, in different approaches, to solve this issue by fusing two cameras. However, they failed to improve the registration and fusing errors, where the obtained results still limited and not accurate enough. To deal with this limitation and decrease these errors, we propose a new method of camera calibration based on Interior-Point Optimisation (IPO) algorithm using transformation matrix estimation. Thi…
Applications and development of acoustic and microwave atomic force microscopy for high resolution tomography analysis
2016
The atomic force microscope (AFM) is a powerful tool for the characterization of organic and inorganic materials of interest in physics, biology and metallurgy. However, conventional scanning probe microscopy techniques are limited to the probing surface properties, while the subsurface analysis remains difficult beyond nanoindentation methods. Thus, the present thesis is focused on two novel complementary scanning probe techniques for high-resolution volumetric investigation that were develop to tackle this persisting challenge in nanometrology.The first technique considered, called Mode Synthesizing Atomic Force Microscopy (MSAFM), has been exploited in collaboration with Dr. Laurene Teta…
Approche coopérative pour l'acquisition et l'observation de formes tridimensionnelles
2009
Technologic progres can reduce the barrier between real image and virtual image so far it is really difficult to recognize them. When virtual reality is well done, augmented reality, from virtual world to real world, is still developped. We want to project a virtual texture onto a 3D real object. By using cameras and projector, we estimate its real pose in the virtual reference by projecting a coded pattern to find points of correspondence between cameras and projector onto the textureless object, where common detector of points of correspondence are useless. We combine the calibration of the system and these points to estimate the 3D position of the object, and then register with a fine mo…
Estimation de la pose d'une caméra dans un environnement connu à partir d'un recalage 2D-3D
2014
National audience; Nous proposons une méthode directe de recalage robuste 2D-3D permettant de localiser une caméra dans un environnement 3D connu. Il s'agit d'un problème rendu particulièrement difficile par l'absence de correspondances entre les points 3D du nuage et les points 2D. A cette difficulté, s'ajoute la différence d'échelle entre le nuage 3D connu et le nuage 3D reconstruit à partir d'images qui, de plus, peut contenir des points aberrants et des occultations. Notre méthode consiste en l'optimisation d'une fonctionnelle de manière itérative en deux étapes : estimation de la pose de la caméra et mise en correspondance 2D-3D. Ainsi, nous obtenons une méthode d'estimation conjointe …
Reconstruction 3D de scènes dynamiques par segmentation au sens du mouvement
2016
National audience; L'objectif de ce travail est de reconstruire les parties sta-tiques et dynamiques d'une scène 3D à l'aide d'un robot mobile équipé d'un capteur 3D. Cette reconstruction né-cessite la classification des points 3D acquis au cours du temps en point fixe et point mobile indépendamment du dé-placement du robot. Notre méthode de segmentation utilise directement les données 3D et étudie les mouvements des objets dans la scène sans hypothèse préalable. Nous déve-loppons un algorithme complet reconstruisant les parties fixes de la scène à chaque acquisition à l'aide d'un RAN-SAC qui ne requiert que 3 points pour recaler les nuages de points. La méthode a été expérimentée sur de la…
Conception d’un dispositif d’acquisition d’images agronomiques 3D en extérieur et développement des traitements associés pour la détection et la reco…
2013
Thèse de Doctorat Sciences pour l’Ingénieur et Microtechniques, Spécialité Instrumentation et Information de l’Image Agrosup ECOLDUR (2013); Dans le cadre de l’acquisition de l’information de profondeur de scènes texturées, un processus d’estimation de la profondeur basé sur la méthode de reconstruction 3D « Shape from Focus » est présenté dans ce manuscrit. Les deux étapes fondamentales de cette approche sont l’acquisition de la séquence d’images de la scène par sectionnement optique et l’évaluation de la netteté locale pour chaque pixel des images acquises. Deux systèmes d’acquisition de cette séquence d’images sont présentés ainsi que les traitements permettant d’exploiter celle-ci pour …