Robert-Inacio F.,French National Center for Scientific Research |
Robert-Inacio F.,Institute Superieur Of Lelectronique Et Du Numerique
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2011
This paper presents an algorithm enabling to detect disks on color images. The proposed method is based on a basic color segmentation giving a preliminary binary image. Then distance mapping is used to determine possible circles. And finally circle location is combined to color information in order to find the best-fitting disk. Furthermore, disks are, in a wide understanding, sets of points for which the distance to a particular point called center, is lower or equal to a given radius value. That is why the proposed method can also detect squares, octagons and other shapes that occur to be disks for a given distance, such as Euclidean, chessboard, Manhattan or chamfer distances. An application to pattern recognition for road sign interpretation is also presented in order to illustrate how road sign shape is a useful and significant information in the sign interpretation process. © 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).
Desbief S.,Aix - Marseille University |
Desbief S.,CNRS Institute Materials Microelectronics nanosciences of Provence |
Desbief S.,Institute Superieur Of Lelectronique Et Du Numerique |
Patrone L.,Aix - Marseille University |
And 6 more authors.
Physical Chemistry Chemical Physics | Year: 2011
In this work, we have studied the growth of self-assembled monolayers (SAMs) on silicon dioxide (SiO2) made of various long alkyltrichlorosilane chains (16, 18, 20, 24, and 30 carbon atoms in the alkyl chain), at several values of temperature (11 and 20 °C in most cases) and relative humidity (18 and 45% RH). Using atomic force microscopy analysis, thickness measurements by ellipsometry, and contact angle measurements, we have built a model of growth behaviour of SAMs of those molecules according to the deposition conditions and the chain length. Particularly, this work brings not only a better knowledge of the less studied growth of triacontyltrichlorosilane (C30H61SiCl3) SAMs but also new results on SAMs of tetracosyltrichlorosilane (C24H49SiCl3) that have not already been studied to our knowledge. We have shown that the SAM growth behaviour of triacontyltrichlorosilane at 20 °C and 45% RH is similar to that obtained at 11 °C and 45% RH for shorter molecules of hexadecyltrichlorosilane (C16H33SiCl3), octadecyltrichlorosilane (C18H37SiCl3), eicosyltrichlorosilane (C20H41SiCl3) and tetracosyltrichlorosilane (C24H49SiCl3). We have also observed that the monolayers grow faster at 45% than at 18% RH, and surprisingly slower at 20 °C than at 11 °C. Another important result is that the growth time constant decreases with the number of carbon atoms in the alkyl chain except for C24H49SiCl3 at 11 °C and 18% RH, and for C30H61SiCl3. To our knowledge, such a chain length dependence of the growth time constant has never been reported. The latter and all the other results are interpreted by adapting a diffusion limited aggregation growth model. © 2011 the Owner Societies.
Alfalou A.,Institute Superieur Of Lelectronique Et Du Numerique |
Brosseau C.,University of Western Brittany
Progress in Optics | Year: 2015
Optical processing of images has received much attention recently. Experimental breakthroughs have been achieved mainly by studying correlation applications for identification and tracking, two-dimensional and three-dimensional holography, compression and encryption of images, etc. While images are originally optical, numerical processing is often realized to fully exploit their information content. Within this context, our aim is to review the recent progress made in the field of optical processing of information. We consider techniques allowing us to increase image quality to render them more useful for correlation and reconstruction applications. The chapter is divided in two parts. In the first part, techniques for increasing image quality are described in detail. Interestingly, those dealing with color encoding are addressed. In addition, methods for denoising images are dealt with. The second part considers the polarization encoding methods. Throughout this review chapter, many examples illustrating the performances of these techniques are given. Future prospects for optimizing current techniques of optical processing of images are suggested. © 2015 Elsevier B.V.
Choqueuse V.,CNRS Brest Laboratory of Mechanics and Systems Laboratory |
Benbouzid M.E.H.,CNRS Brest Laboratory of Mechanics and Systems Laboratory |
Amirat Y.,CNRS Brest Laboratory of Mechanics and Systems Laboratory |
Amirat Y.,Institute Superieur Of Lelectronique Et Du Numerique |
Turri S.,CNRS Brest Laboratory of Mechanics and Systems Laboratory
IEEE Transactions on Industrial Electronics | Year: 2012
This paper deals with the diagnosis of three-phase electrical machines and focuses on failures that lead to stator-current modulation. To detect a failure, we propose a new method based on stator-current demodulation. By exploiting the configuration of three-phase machines, we demonstrate that the demodulation can be efficiently performed with low-complexity multidimensional transforms such as the Concordia transform (CT) or the principal component analysis (PCA). From a practical point of view, we also prove that PCA-based demodulation is more attractive than CT. After demodulation, we propose two statistical criteria aiming at measuring the failure severity from the demodulated signals. Simulations and experimental results highlight the good performance of the proposed approach for condition monitoring. © 2011 IEEE.
Katz P.,Institute Superieur Of Lelectronique Et Du Numerique |
Aron M.,Institute Superieur Of Lelectronique Et Du Numerique |
Alfalou A.,Institute Superieur Of Lelectronique Et Du Numerique
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013
In this paper, an iterative tracking algorithm based on a non-linear JTC (Joint Transform Correlator) architecture and enhanced by a digital image processing method is proposed and validated. This algorithm is based on the computation of a correlation plane where the reference image is updated at each frame. For that purpose, we use the JTC technique in real time to track a patient (target image) in a room fitted with a video camera. The correlation plane is used to localize the target image in the current video frame (frame i). Then, the reference image to be exploited in the next frame (frame i+1) is updated according to the previous one (frame i). In an effort to validate our algorithm, our work is divided into two parts: (i) a large study based on different sequences with several situations and different JTC parameters is achieved in order to quantify their effects on the tracking performances (decimation, non-linearity coefficient, size of the correlation plane, size of the region of interest...). (ii) the tracking algorithm is integrated into an application of elderly fall detection. The first reference image is a face detected by means of Haar descriptors, and then localized into the new video image thanks to our tracking method. In order to avoid a bad update of the reference frame, a method based on a comparison of image intensity histograms is proposed and integrated in our algorithm. This step ensures a robust tracking of the reference frame. This article focuses on face tracking step optimisation and evalutation. A supplementary step of fall detection, based on vertical acceleration and position, will be added and studied in further work. © 2013 SPIE.
Delaleau E.,Institute Superieur Of Lelectronique Et Du Numerique
2014 IEEE Conference on Norbert Wiener in the 21st Century: Driving Technology's Future, 21CW 2014 - Incorporating the Proceedings of the 2014 North American Fuzzy Information Processing Society Conference, NAFIPS 2014, Conference Proceedings | Year: 2014
Cybernetics involves Control Theory and Control Practice. From its roots, Cybernetics has always been intimately to Control. The paper is devoted to the proof of an important theorem for the development of control: the closed loop stability of control laws that are calculated in the framework of model-free control. Everyone knows the importance of control in the field of Cybernetics . © 2014 IEEE.
Thakkar C.,University of California at Berkeley |
Kong L.,University of California at Berkeley |
Jung K.,University of California at Berkeley |
Frappe A.,Institute Superieur Of Lelectronique Et Du Numerique |
Alon E.,University of California at Berkeley
IEEE Symposium on VLSI Circuits, Digest of Technical Papers | Year: 2011
This paper presents a low-power adaptive 60GHz baseband in 65nm CMOS. The design integrates variable gain amplifiers, analog phase rotator, 40-coefficient I/Q decision feedback equalizers (DFEs), clock generation and data recovery circuits, and adaptation hardware. The baseband achieves 10Gb/s while consuming 53mW (DFE adaptation on)/45mW (DFE adaptation off), representing ∼10X improvement in data-rate and power efficiency over prior art ,. © 2011 JSAP (Japan Society of Applied Physi.
Gerval J.-P.,Institute Superieur Of Lelectronique Et Du Numerique |
Ru Y.L.,Institute Superieur Of Lelectronique Et Du Numerique
Proceedings of the IASTED International Conference on Computers and Advanced Technology in Education, CATE 2012 | Year: 2012
This paper presents a Web-Based System that aims at helping both academic staff and students in the task of Student-Project Allocation (SPA). For this purpose, we use a Constraint Programming Solver and we describe the model that has been implemented. The server implements a LAMP (Linux, Apache, MySQL and PHP) architecture. This system also provides functionalities that concern all the life cycle of a student's project from the writing of subjects by the teachers in the early beginning to the evaluation of the students' work at the end of their projects. This System implements various types of technologies: Databases, Web Technologies, Object Oriented Programming, Constraint Programming.
Gerval J.-P.,Institute Superieur Of Lelectronique Et Du Numerique |
Le Ru Y.,Institute Superieur Of Lelectronique Et Du Numerique
Intelligent Systems Reference Library | Year: 2015
PubMed | Institute Superieur Of Lelectronique Et Du Numerique and CNRS Lorraine Research Laboratory in Informatics and its Applications
Type: Journal Article | Journal: The Journal of the Acoustical Society of America | Year: 2016
Acquisition of dynamic articulatory data is of major importance for studying speech production. It turns out that one technique alone often is not enough to get a correct coverage of the whole vocal tract at a sufficient sampling rate. Ultrasound (US) imaging has been proposed as a good acquisition technique for the tongue surface because it offers a good temporal sampling, does not alter speech production, is cheap, and is widely available. However, it cannot be used alone and this paper describes a multimodal acquisition system which uses electromagnetography sensors to locate the US probe. The paper particularly focuses on the calibration of the US modality which is the key point of the system. This approach enables US data to be merged with other data. The use of the system is illustrated via an experiment consisting of measuring the minimal tongue to palate distance in order to evaluate and design Magnetic Resonance Imaging protocols well suited for the acquisition of three-dimensional images of the vocal tract. Compared to manual registration of acquisition modalities which is often used in acquisition of articulatory data, the approach presented relies on automatic techniques well founded from geometrical and mathematical points of view.