973 Hits in 1.3 sec

Ear-to-ear Capture of Facial Intrinsics [article]

Alassane Seck, William A. P. Smith, Arnaud Dessein, Bernard Tiddeman, Hannah Dee, Abhishek Dutta
2016 arXiv   pre-print
Dessein are with the Department {william.smith,arnaud.dessein} • A. Dutta is with the University of Twente, Netherlands.  ...  Arnaud  ... 
arXiv:1609.02368v1 fatcat:ir7aynfoybamjpmsfpszheux6m

Free Classification Of Vocal Imitations Of Everyday Sounds

Arnaud Dessein, Guillaume Lemaitre
2009 Proceedings of the SMC Conferences  
(Abstract to follow)
doi:10.5281/zenodo.849627 fatcat:nbtzmblou5afliutc6q6eygqnm

Vocal Imitations and the Identification of Sound Events

Guillaume Lemaitre, Arnaud Dessein, Patrick Susini, Karine Aura
2011 Ecological psychology  
the various linguistic devices used to describe a sound, we have observed that vocal imitations are spontaneously used when subjects have to communicate a sound that they have just heard (Lemaitre, Dessein  ... 
doi:10.1080/10407413.2011.617225 fatcat:55o7elgx4rgubchfh7rn6skteq

Online Change Detection in Exponential Families with Unknown Parameters [chapter]

Arnaud Dessein, Arshia Cont
2013 Lecture Notes in Computer Science  
This paper studies online change detection in exponential families when both the parameters before and after change are unknown. We follow a standard statistical approach to sequential change detection with generalized likelihood ratio test statistics. We interpret these statistics within the framework of information geometry, hence providing a unified view of change detection for many common statistical models and corresponding distance functions. Using results from convex duality, we also
more » ... ve an efficient scheme to compute the exact statistics sequentially, which allows their use in online settings where they are usually approximated for the sake of tractability. This is applied to real-world datasets of various natures, including onset detection in audio signals.
doi:10.1007/978-3-642-40020-9_70 fatcat:brasrfxfdnbnhbrwhntvki2b2i

Real-Time Polyphonic Music Transcription With Non-Negative Matrix Factorization And Beta-Divergence

Arnaud Dessein, Arshia Cont, Guillaume Lemaitre
2010 Zenodo  
[TODO] Add abstract here.
doi:10.5281/zenodo.1414824 fatcat:stv2fvsbgzenvod6cwcg5tk3ey

An Information-Geometric Approach to Real-Time Audio Segmentation

Arnaud Dessein, Arshia Cont
2013 IEEE Signal Processing Letters  
To cite this version: Arnaud Dessein, Arshia Cont. An information-geometric approach to real-time audio segmentation.  ...  An Information-Geometric Approach to Real-Time Audio Segmentation Arnaud Dessein, and Arshia Cont Abstract-We present a generic approach to real-time audio segmentation in the framework of information  ... 
doi:10.1109/lsp.2013.2247039 fatcat:lvemxmvlyrcwxgxfyx467jjjnq

Real-Time Detection of Overlapping Sound Events with Non-Negative Matrix Factorization [chapter]

Arnaud Dessein, Arshia Cont, Guillaume Lemaitre
2012 Matrix Information Geometry  
Dessein, Arshia Cont, and Guillaume Lemaitre  ...  frequency estimation and tracking are available on-line: 2010:Multiple_Fundamental_Frequency_Estimation_%26_Tracking_Results. hal-00708805, version 1 -15 Jun 2012 Arnaud  ... 
doi:10.1007/978-3-642-30232-9_14 fatcat:kwt5l2krnnfirl4xjj45lzam34

Control of Chatter by Spindle Speed Variation in High-Speed Milling

Sébastien Seguy, Gilles Dessein, Lionel Arnaud, Tamás Insperger
2010 Advanced Materials Research  
High-speed milling operations are often limited by regenerative vibrations. The aim of this paper is to analyze the effect of spindle speed variation on machine tool chatter in high-speed milling. The stability analysis of triangular and sinusoidal shape variations is made numerically with the semi-discretization method. Parametric studies show also the influence of the frequency and amplitude variation parameters. This modeling is validated experimentally by variable spindle speed cutting
more » ... with a triangular shape. Stable and unstable tests are analyzed in term of amplitude vibration and surface roughness degradation. This work reveals that stability must be considered at period variation scale. It is also shown that spindle speed variation can be efficiently used to suppress chatter in the flip lobe area.
doi:10.4028/ fatcat:k3mfqjfbijdivdrt6nkzb3x7j4

Parameter Estimation in Finite Mixture Models by Regularized Optimal Transport: A Unified Framework for Hard and Soft Clustering [article]

Arnaud Dessein and Nicolas Papadakis and Charles-Alban Deledalle
2017 arXiv   pre-print
In this short paper, we formulate parameter estimation for finite mixture models in the context of discrete optimal transportation with convex regularization. The proposed framework unifies hard and soft clustering methods for general mixture models. It also generalizes the celebrated k-means and expectation-maximization algorithms in relation to associated Bregman divergences when applied to exponential family mixture models.
arXiv:1711.04366v1 fatcat:qig57yrbanhgxjrvx72tnjsfdq

Surface roughness variation of thin wall milling, related to modal interactions

Sébastien Seguy, Gilles Dessein, Lionel Arnaud
2008 International journal of machine tools & manufacture  
High-speed milling operations of thin walls are often limited by the so-called regenerative effect that causes poor surface finish. The aim of this paper is to examine the link between chatter instability and surface roughness evolution for thin wall milling. Firstly, the linear stability lobes theory for the thin wall milling optimisation was used. Then, in order to consider the modal interactions, an explicit numerical model was developed. The resulting nonlinear system of delay differential
more » ... quations is solved by numerical integration. The model takes into account the coupling mode, the modal shape, the fact that the tool may leave the cut and the ploughing effect. Dedicated experiments are carried out in order to confirm this modelling. This paper presents surface roughness and chatter frequency measurements. The stability lobes are validated by thin wall milling. Finally, the modal behaviour and the mode coupling give a new interpretation of the complex surface finish deterioration often observed during thin wall milling.
doi:10.1016/j.ijmachtools.2007.09.005 fatcat:n4imy4ovn5d7hl2vjbpserrhiy

Functional Faces: Groupwise Dense Correspondence Using Functional Maps

Chao Zhang, William A. P. Smith, Arnaud Dessein, Nick Pears, Hang Dai
2016 2016 IEEE Conference on Computer Vision and Pattern Recognition (CVPR)  
In this paper we present a method for computing dense correspondence between a set of 3D face meshes using functional maps. The functional maps paradigm brings with it a number of advantages for face correspondence. First, it allows us to combine various notions of correspondence. We do so by proposing a number of face-specific functions, suited to either within-or between-subject correspondence. Second, we propose a groupwise variant of the method allowing us to compute cycle-consistent
more » ... nal maps between all faces in a training set. Since functional maps are of much lower dimension than point-to-point correspondences, this is feasible even when the input meshes are very high resolution. Finally, we show how a functional map provides a geometric constraint that can be used to filter feature matches between non-rigidly deforming surfaces.
doi:10.1109/cvpr.2016.544 dblp:conf/cvpr/ZhangSDPD16 fatcat:qktgegcnafdd7mtrwct775aita

Analysis of the 5q31-q33 Locus Shows an Association between IL13-1055C/T IL-13-591A/G Polymorphisms and Schistosoma haematobium Infections

B. Kouriba, C. Chevillard, J. H. Bream, L. Argiro, H. Dessein, V. Arnaud, L. Sangare, A. Dabo, A. H. Beavogui, C. Arama, H. A. Traore, O. Doumbo (+1 others)
2005 Journal of Immunology  
doi:10.4049/jimmunol.174.10.6274 pmid:15879126 fatcat:wyukc2ajlzastiru4fuh2yd4mq

Influence de la position de l'outil sur le comportement dynamique en fraisage de parois minces

Vincent Thevenot, Lionel Arnaud, Gilles Dessein, Gilles Cazenave-Larroche
2005 Mécanique & industries  
Les problèmes vibratoires rencontrés lors de l'usinage en contournage de parois minces affectent la qualité de la pièce finie et dans une moindre mesure, la durée de vie de l'outil et de la broche. C'est pourquoi il est nécessaire de pouvoir limiter ces problèmes par un choix approprié des conditions de coupe. La théorie des lobes de stabilité permet de choisir les conditions de coupe adéquates en fonction du comportement dynamique de la pièce ou de l'outil. Nous introduisons ici les variations
more » ... de comportement dynamique duesà la position de l'outil, dans le but d'obtenir des conditions de coupe optimales tout le long de l'usinage. Cette généralisation du tracé classique des lobes de stabilité nous conduità représenter les lobes en trois dimensions. Ces résultats théoriques sont comparésà des usinages expérimentaux de pièces minces, en avalant. Mots clés : Lobes de stabilité 3D / fraisage de paroi mince / comportement dynamique Abstract -Influence of the tool position on the dynamic behaviour in milling of thin walled structure. Vibratory problems encountered when milling a thin walled structure affect the surface quality of the finished workpiece and to a lesser extent, the life of the tool and the spindle. This is why, it is necessary to be able to limit these problems by an appropriate choice of the cutting conditions. The stability lobes theory allows to choose the suitable cutting conditions according to the dynamic behaviour of the workpiece and the tool. We introduce here the variations of dynamic behaviour due to the tool position, in order to obtain optimum cutting conditions all along the machining. This general implementation of the classical stability lobes graph leads us to represent the lobes in three dimensions. These theoretical results are compared with experimental milling of thin walled structure, in down-milling. Key words: 3D stability lobes / milling of thin walled structure / dynamic behaviour
doi:10.1051/meca:2005048 fatcat:xsjnq7ujfzbajonfmskj22ffba

Example-Based Modeling of Facial Texture from Deficient Data

Arnaud Dessein, William A. P. Smith, Richard C. Wilson, Edwin R. Hancock
2015 2015 IEEE International Conference on Computer Vision (ICCV)  
We present an approach to modeling ear-to-ear, highquality texture from one or more partial views of a face with possibly poor resolution and noise. Our approach is example-based in that we reconstruct texture with patches from a database composed of previously seen faces. A 3D morphable model is used to establish shape correspondence between the observed data across views and training faces. The database is built on the mesh surface by segmenting it into uniform overlapping patches. Texture
more » ... ches are selected by belief propagation so as to be consistent with neighbors and with observations in an appropriate image formation model. We also develop a variant that is insensitive to light and camera parameters, and incorporate soft symmetry constraints. We obtain textures of higher quality for degraded views as small as 10 pixels wide, than a standard model fitted to non-degraded data. We further show applications to super-resolution where we substantially improve quality compared to a state-of-the-art algorithm, and to texture completion where we fill in missing regions and remove facial clutter in a photorealistic manner.
doi:10.1109/iccv.2015.444 dblp:conf/iccv/DesseinSWH15 fatcat:fegnslxzyfewll3qc57zecteli

Application of the Stability Lobes Theory to Milling of Thin Workpieces [chapter]

L. Arnaud, G. Dessein
2003 Recent Advances in Integrated Design and Manufacturing in Mechanical Engineering  
The optimisation of cutting conditions in High Speed Machining (HSM) requires the use of a vibratory approach in order to avoid a fast deterioration of the tool and of the spindle, as well as a loss of quality of the surface roughness. We suggest a transposition of the method of stability lobes to the case of the milling thin parts, which is very typical from the aeronautical manufacturing context. After having modelled the dynamic behaviour of a blade and of the cutting efforts in side
more » ... we describe the zones of machining instability. An experimental validation permits us to emphasise the transition from stability to instability, in accordance to our theoretical results. The experimental profile is then compared with a computed profile. A decomposition of the different situations of contact between the tool and the part permits to show the influence of back cutting in the model. Tests of machining permit then to quantify its role. The objective of these works is the definition of a quick methodology for determining the optimal cutting conditions in a given industrial machining configuration.
doi:10.1007/978-94-017-0161-7_27 fatcat:jz5xr4q5yve4bfoqmbjq5cbnwu
« Previous Showing results 1 — 15 out of 973 results