.. Scénarios-d-'acquisitions-réels-et-simulés, 106 4.3.1 Scénario 1 : câble en cuivre, p.112

M. Nous-venons-de-voir-que-le-simulateur, . 4d, and L. Complété-par-le-module-capteur, permettait de simuler l'acquisition d'images laseràlaserà partir d'un plan focal 3D en mode Geiger. L'affichage des données 3D confirme la sensibilité de ce capteur au signal laser, ` a travers la détection deséchosdeséchos retour provenant de l'objet, mais aussi aux différents bruits parasites, avec l'apparition de nombreuses fausses alarmes autour de l'objet. Ce simulateur nous a aussi donné la possibilité de développer nos propres cha??nescha??nes de traitements pour exploiter les nuages de points 3D obtenus. Mais avant de pouvoir montrer, ` a partir de simulations, l'intérêt de son concept et sa faisabilité pour la cartographie aéroportée, ií etait nécessaire de vérifier la fiabilité des hypothèseshypothèsesémises (principe physique de détection, paramètres " système " et " environnement " estimés), en comparant les résultats de simulation avec des résultats expérimentaux issus d'acquisitions dites " réelles

A. Cartographies, . Dcr, L. De, and . Pde, proches de notre application d'intérêt, tout en assurant la ma??trisema??trise de la scène Il s'agit d'objets " canoniques " que l'on peut potentiellement rencontrer lors de la reconnaissance d'une zone ou d'une opération " voir etéviter etéviter " lors d'un voì a basse altitude : une voiture, et un câble métallique suspendu. Le choix des cibles estégalementestégalement justifié par la nécessité de disposer d'objets dont les propriétés géométriques et optiques sont connues ou peuventêtrepeuventêtre mesurées sur le terrain. Le petit diamètre du câble par rapportàrapportà la taille d'un pixel est par ailleurs un bon exemple pourétudierpourétudier les capacités de détection des petits objets par un capteur GmAPD. D'autre part, les dimensions d'un véhicule permettent d, Nous avons souhaité valider la cha??necha??ne numérique sur deux cas d'´ etudes

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