Search results for "Stéréovision"
showing 4 items of 4 documents
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…
The compliance modelling of the pathology aorta of the type of aneurism
2015
The Abdominal Aorta Aneurysm (AAA) is a pathology that is defined by a localized and permanent dilation of the artery and which involves over 8.8% of the seniors. Currently, when a patient has a dilatation of the aorta leading to a surgery because of the rupture risk, the therapeutic decision is made depending on the diameter of the aneurysm. To determine this diameter, it is usually conducted an examination by medical imaging (ultrasound, CT, MRI...). However, it notes that the diagnosis can’t be satisfied with a single dimensional measurement face to induced risks: first of all, when the diameter exceed a certain growth, the risk of rupture can reach 50% but more than 5% of surgical proce…
Comparaison de la mesure des déformations de fantômes de l’aorte à partir d’image obtenues par IRM et stéréovision
2015
International audience; The study of the wall strain distribution could be helpful to improve the decision criterion for surgery of aortic aneurysm. Recently, numerical simulations can complete the data obtained from imaging measurement in order to develop reliable models. However, the used medical imaging tools are not experimentally validated, in metrological point of view. The aim of this study focused on accuracy and reliability of measurement obtained from kinetic MR sequences. The measures of deformations from MRI were compare to those obtained from stereovision system. Cylindrical phantom of silicone material similar to arterial behavior simulated a symmetric aneurysm was designed. A…
Étude du comportement de l'aorte dans le cadre de pathologie de type anévrisme
2013
International audience; Lorsqu'un patient présente une dilatation de l'aorte impliquant la possibilité d'une intervention chirurgicale (en raison du risque de rupture), la décision thérapeutique est prise en fonction du rapport des diamètres de l'artère. Toutefois cette mesure dimensionnelle est insuffisante et doit être compléter d'une estimation de la compliance de l'artère. C'est un travail complexe prenant en compte divers aspects. C'est une première approche qui présentée dans ce papier. Elle a pour objectif de quantifier les déformations de fantômes (répliques) en silicone ayant des géométries simplifiées mais proches de celle des patients présentant une pathologie de type anévrisme. …