Showing papers by "Aymeric Histace published in 2016"
TL;DR: This approach allows us to detect approximately 90% of polyps on a freely available database introduced to the community in 2012, for a F2 score of 65%, and matches real-time constraint by making possible the analysis of a frame in only 0.023s on a standard computer not necessarily dedicated to that kind of application.
20 citations
15 Oct 2016
4 citations
01 Dec 2016
TL;DR: The purpose of this work is the characterization and implementation of a pulse oximeter with a Buried Quad Junction photodetector (BQJ), which can reduce both: the number ofphotodetectors and the area needed for multiwavelength pulse oximetry.
Abstract: Traditional pulse oximeters rely on the use of red and infrared LEDs and a photodiode for measuring transmittance between tissues and estimate the functional oxygen saturation. Currently, studies are being made for the development of multiwavelength pulse oximeters in order to increase accuracy and to estimate the presence of other compounds such as carboxyhemoglobin or methemoglobin. The purpose of this work is the characterization and implementation of a pulse oximeter with a Buried Quad Junction photodetector (BQJ), which can reduce both: the number of photodetectors and the area needed for multiwavelength pulse oximetry. With this type of photodetector, it is also possible to continuously estimate oxygen saturation without the need of pulsating LEDs.
2 citations
06 Nov 2016
TL;DR: In this paper, a reactive multi-agent-system integrating physical diffusion phenomena is proposed to model the behavior of the bark beetle, which is responsible for the devastation of acres of pines trees in North America since 2005.
Abstract: This article deals with the social behavior modeling of a particular forest pest insect: the bark beetle. This ant-like insect has been responsible for the devastation of acres of pines trees in North America since 2005. Any tactic of forest pest management requiring prediction of pest population change over time and/or space, a realistic modeling of beetle colonies behavior would be a real benefit. The originality of this work is to propose a reactive Multi-Agent- System integrating physical diffusion phenomena. The main idea is to take into account the natural vanishing of the trail markers emitted both by decomposing trees (ethanol) and the agents that have found a source of food (pheromone). The proposed experiments show, on the one hand, that the MAS-PDE modeling leads to a realistic global behavior of the colony when considering a usual foraging scenario and, on the other hand, that, when compared with a simple reactive agent, the proposed model has a faster convergence to the asymptotic usual expected "S-shape" behavior of the agents' colony.
1 citations
15 Oct 2016
TL;DR: The two proposed CAC scores based on the ratio of color intensities come with high sensitivities for discriminating between “adequately cleansed” and “inadequately cleaned” CCE still frames, but they lack specificity.
1 citations
30 Nov 2016
TL;DR: It is shown that this particular potential leads to a particular regularization PDE which makes the integration of prior knowledge about the gradient intensity level to enhance possible, and the corresponding method shows interesting properties regarding stability and preservation of fine structures.
Abstract: Non-linear or anisotropic regularization PDE's (Partial Differential Equation) raised a strong interest in the field of medical image processing. The benefit of PDE-based regularization methods lies in the ability to smooth data in a nonlinear way, allowing the preservation of important image features (contours, corners or other discontinuities). In this article, we propose a PDE-based method restoration approach integrating a double-well potential as diffusive function. It is shown that this particular potential leads to a particular regularization PDE which makes the integration of prior knowledge about the gradient intensity level to enhance possible. The corresponding method shows interesting properties regarding stability and preservation of fine structures. As a proof a feasibility, results of restoration are presented on natural images to show potentialities of the proposed method. We also address a particular medical application: enhancement of tagged cardiac MRI.
Patent•
23 Jun 2016
TL;DR: In this article, a system and a method for the automated identification of haematophagous Diptera that are vectors of infectious diseases is presented, which is based on optical interference patterns of said wings.
Abstract: The invention concerns a system and a method for the automated identification of haematophagous Diptera that are vectors of infectious diseases. The system according to the invention comprises: - a database containing reference image data of wings of a plurality of species of haematophagous Diptera that are vectors of infectious diseases, said image data being obtained from optical interference patterns of said wings; a portable device comprising means for acquiring images of a wing removed from a captured Diptera specimen; - a support for holding the wing removed from the captured Diptera specimen; - means for transmitting image data of the removed wing to the database; and - means for comparing the image data of the removed wing with the reference image data of the database and for identifying the captured Diptera with a view to determining if said Diptera is a haematophagous Diptera that is a vector of infectious diseases. The invention applies to the identification of haematophagous Diptera that are vectors of infectious diseases.