Orange S.A.

About: Orange S.A. is a company organization based out in Paris, France. It is known for research contribution in the topics: Terminal (electronics) & Signal. The organization has 6735 authors who have published 9190 publications receiving 156440 citations. The organization is also known as: Orange SA & France Télécom.

Robust GrayScale Distribution Estimation for Contactless Palmprint Recognition

Abstract: More and more research have been developed very recently for automatic hand recognition. This paper proposes a new method for contactless hand authentication in complex images. Our system uses skin color and hand shape information for an accurate hand detection process. Then, the palm is extracted and characterized by a robust and normalized decomposition. During enrollment, a distribution estimation is used to defined the optimal discrimination of the palmprint features. Finally, some specific thresholds are defined to separate in test phase impostor and genuine users. The experimental results present an error rate of 1.5% with a population of 49 people.

Modulation, filtering, and initial phase control of interacting solitons

Abstract: We apply a complete perturbation theory of solitons (for position, phase, frequency, and amplitude) to the cases of amplitude, intensity, or phase modulation, filtering, and soliton interaction. We show that on-line intensity modulation and filtering act in the same way in reducing noise-induced jitter. Soliton interaction can be reduced with initial phase and filtering control or with a periodic π-phase change for consecutive solitons (as in the case of amplitude modulation). Finally, we design a 30-Gbit/s transoceanic soliton transmission system, using filtering and initial phase control techniques.

Reduction of quantum noise in soliton propagation by phase-sensitive amplification

Abstract: We study the possibility of employing phase-sensitive parametric amplifiers to compensate for losses incurred by solitons propagating in optical fibers As phase-sensitive amplification is free from the excess spontaneous noise associated with laser amplifiers, the only quantum noise source in such a system arises from the fiber losses In addition, under phase-sensitive amplification, fluctuations in the soliton frequency are squeezed to one half of the vacuum level, thus producing a negligible contribution to the fluctuations in the soliton arrival time This greatly reduces the Gordon–Haus jitter of the solitons The performance of the phase-sensitive amplifier is compared with that of alternative noise-reduction schemes employing phase-insensitive amplifiers and spectral filters as well as with the limits on long-distance data transmission imposed by quantum mechanics

Adaptive patrol for a group of robots

Abstract: Patrolling is a basic task for a group of robots. All regions of an area are checked at regular interval and robots may look for intruders or garbage to collect. This work proposes a reactive and adaptive approach of this problem. In a virtual environment shared by robots, task data are propagated from place to place with modifications in order to represent locally distant-tasks value. A robot bas access to task data situated in the region where it stands and follows a gradient that guides it to valuable regions. First experiments on a simulator are presented. In addition of being efficient in achieving the work, the proposed architecture shows interesting properties of adaptability concerning the group size, the environment size and type.

Photonic bandgap of two-dimensional dielectric crystals

Abstract: The existence of an absolute photonic bandgap in the near-infrared for two-dimensional periodic dielectric structures is discussed for photons propagating in the plane of such 2D crystals. A special emphasis is put on the influence of the shape and size of the filling pattern on the absolute bandgap formation. A very large absolute photonic bandgap is predicted for 2D crystals formed by etching into a semiconductor slab a periodic array of large vertical cylindric voids of circular cross-section arranged in a triangular lattice. The technological feasibility of such “optimum” air/GaAs 2D crystals by standard processing techniques (electron beam lithography and reactive ion etching) is demonstrated.