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Literatura académica sobre el tema "Estimation de la direction du regard"

Autor: Grafiati

Publicado: 25 de mayo de 2024

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Artículos de revistas sobre el tema "Estimation de la direction du regard"

Kumar, V. y S. K. Dhull. "Genetic Algorithm based Optimization of Uniform Circular Array". Engineering, Technology & Applied Science Research 10, n.º 6 (20 de diciembre de 2020): 6403–9. http://dx.doi.org/10.48084/etasr.3792.

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Signal estimation at the antenna is a major challenge of the antenna array structure because the received signals have different directions. Therefore, in this paper, a Genetic Algorithm (GA) is applied to the uniform circular array for the optimization of array structure in regard to its geometry. On the optimized array structure, four different algorithms (Estimation of Signal Parameter via Rotational Invariance Technique – ESPRIT, First Order Forward Prediction - FOFP, Beamscan, and Multiple Signal Classification - MUSIC) have been implemented in order to estimate the signal direction accurately with quick estimation time. The accuracy has been calculated with Root Mean Square Error (RMSE) indices. From the experimental analysis, it has been found that the performance of the ESPRIT algorithm is better than the others in terms of accuracy and estimation time.

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Bludov, A. A., G. A. Gorbatovskij, V. S. Pavlov y A. F. Suvorov. "Estimation and Adjustment of Polarization Errors in Conical Scan Method". Journal of the Russian Universities. Radioelectronics, n.º 2 (5 de junio de 2018): 47–54. http://dx.doi.org/10.32603/1993-8985-2018-21-2-47-54.

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The article proposes a solution of a problem of polarization error compensation for radar object direction finding by means of conical scan method. The solution is considered at signal processing level that makes possible to avoid polarization limitations in antennas engineering. The purpose of the article is to substantiate a model for polarization-induced errors by conical scan direction finding method and to develop an algorithmic technique for the considered method correction with regard to arbitrary polarization conditions of radar interaction. The results are presented by analytical model along with quantitative estimates of polarization-induced errors of direction finding and the computational procedure of the error compensation as well as by analysis of imperfectness factors for the proposed procedure exposing its practical applicability.

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He, Jiazhi, Zhen Huang y Xuefeng Feng. "A High-Precision Algorithm for DOA Estimation Using a Long-Baseline Array Based on the Hearing Mechanism of the Ormia Ochracea". Sensors 22, n.º 3 (7 de febrero de 2022): 1249. http://dx.doi.org/10.3390/s22031249.

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Inspired by the Ormia Ochracea hearing mechanism, a new direction of arrival estimation using multiple antenna arrays has been considered in spatially colored noise fields. This parasitoid insect can locate s cricket’s position accurately using the small distance between its ears, far beyond the standard array with the same aperture. This phenomenon can be understood as a mechanical coupled structure existing between the Ormia ears. The amplitude and phase differences between the received signals are amplified by the mechanical coupling, which is functionally equivalent to a longer baseline. In this paper, we regard this coupled structure as a multi-input multi-output filter, where coupling exists between each pair of array elements. Then, an iterative direction-finding algorithm based on fourth-order cumulants with fully coupled array is presented. In this manner, the orientation of the mainlobe can direct at the incident angle. Hence, the direction-finding accuracy can be improved in all possible incident angles. We derive the Cramér-Rao lower bound for our proposed algorithm and validate its performance based on simulations. Our proposed DOA estimation algorithm is superior to the existing biologically inspired direction-finding and fourth-order cumulants-based estimation algorithms.

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Wu, Tao, Zhenghong Deng, Jiwei Xu y Qingyue Gu. "Estimation for Two-Dimensional Incoherently Distributed Source in Double L-Shape Arrays". Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 37, n.º 4 (agosto de 2019): 838–45. http://dx.doi.org/10.1051/jnwpu/20193740838.

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Distributed sources can be regarded as an assembly of point sources within a spatial distribution. In this paper, we explore the estimation of the two-dimensional incoherently distributed sources using double L-shape arrays. The rotational invariance properties of the nominal elevation and nominal elevation are firstly obtained by taking first-order Taylor series expansions with regard to the generalized steering vectors of two pairs of parallel subarrays. The rotation operators can be solved based on signal subspace. Then the nominal elevation and nominal elevation can be obtained from parameters matching method. Estimation of direction of arrival can be used in multi-source scenario and needn't peak-finding search. Lastly the angular spreads can be solved through two-dimensional Capon search based on nominal angles. The simulation experiments show that the proposed method has good performance on the estimation of two-dimensional incoherently distributed sources. Investigating different experimental conditions, sources with different angular spreads, simulations are conducted to validate better estimation accuracy of the proposed method.

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Ezazshahabi, Nazanin, Masoud Latifi y Mohammad Amani Tehran. "Analysis of Frictional Behavior of Woven Fabrics by a Multi-directional Tactile Sensing Mechanism". Journal of Engineered Fibers and Fabrics 10, n.º 3 (septiembre de 2015): 155892501501000. http://dx.doi.org/10.1177/155892501501000307.

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The frictional property of woven fabrics is one of the prominent surface characteristics which influence the performance of fabrics in a variety of applications. In this paper a novel methodology and instrument is proposed to measure the tactile force between fabric and simulated skin in different directions, and the obtained data are used for assessing fabric frictional property. In this regard, nine groups of woven fabrics consisting of three weave structures and three different weft densities were tested. By fitting the data with a proper equation, the tactile force in terms of fabric direction was predicted. The mentioned equation is also utilized for estimation of frictional behavior of fabric in various directions. Moreover, a single, new parameter called “frictional energy” is defined which has the ability to properly quantify the fabric frictional behavior. Statistical analysis of results reveals that the effect of weave structure and weft density is significant on the fabric friction. Being aware of the effect of fabric construction on friction is a guide for selecting the suitable fabric for various end uses.

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Saruchi, Sarah ‘Atifah, Mohd Hatta Mohammed Ariff, Hairi Zamzuri, Noor Hafizah Amer, Nurbaiti Wahid, Nurhaffizah Hassan y Khairil Anwar Abu Kassim. "Novel Motion Sickness Minimization Control via Fuzzy-PID Controller for Autonomous Vehicle". Applied Sciences 10, n.º 14 (10 de julio de 2020): 4769. http://dx.doi.org/10.3390/app10144769.

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In terms of vehicle dynamics, motion sickness (MS) occurs because of the large lateral acceleration produced by inappropriate wheel turning. In terms of passenger behavior, subjects experience MS because they normally tilt their heads towards the direction of lateral acceleration. Relating these viewpoints, the increment of MS originates from the large lateral acceleration produced by the inappropriate wheel’s turn, which then causes greater head movement with respect to the lateral acceleration direction. Therefore, this study proposes the utilization of fuzzy-proportional integral derivative (PID) controller for an MS minimization control structure, where the interaction of the lateral acceleration and head tilt concept is adopted to diminish the lateral acceleration. Here, the head movement is used as the controlled variable to compute the corrective wheel angle. The estimation of the head movement is carried out by an estimation model developed by the radial basis function neural network (RBFNN) method. An experiment involving a driving simulator was conducted, to verify the proposed control system’s performance in regard to the autonomous vehicle’s passengers. The results show that the averages of motion sickness incidence (MSI) index can be lowered by 3.95% for single lap and 11.49% for ten laps.

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Shibu, Damodaran Santhamani, Soman Latha Nitin, Christophe Chesneau, Muhammed Rasheed Irshad, Sobhanam Padmini Shibin y Radhakumari Maya. "On the Hybrid Normal Distribution and Its Application in Fiber Data on the Strength of Glass". Dynamics 2, n.º 4 (18 de noviembre de 2022): 399–413. http://dx.doi.org/10.3390/dynamics2040023.

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The hybrid normal (HN) distribution is a new generalization of the normal distribution that we introduce and study in this article. Its mathematical foundation is based on the logarithmically transformed version of the famous hybrid log-normal (HLN) distribution, which is an unexplored direction in the literature. We emphasize the applicability of the HN distribution with the aim of fitting versatile data, such as, in this paper, fiber data on the strength of glass. In particular, the unknown parameters are estimated using both Bayesian and maximum likelihood estimation approaches, with Bayesian estimation carried out using the MCMC approach. A thorough simulation study is performed to determine the flexibility of the estimates’ performance. The glass fiber data are then analyzed, with an assessment of several existing distributions from the literature used to demonstrate how the HN distribution is relevant in this regard.

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Ukleja, Janusz. "Stability estimation of slopes with determined slip surface by the MSTAB-3D method based on sliding body limit equilibrium analysis". MATEC Web of Conferences 262 (2019): 04004. http://dx.doi.org/10.1051/matecconf/201926204004.

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The method developed for this study, established on the premises of the limit equilibrium flat analysis for a spatial solution, is a modification of the STAB-3D method, previously described by the author. It combines the analyses methods of 2D slices of flat cross–sections with the spatial analyses methodology rooted in a specific breakdown of a landslide sliding body into 3D elements assuming some simplifying solution. However, this method is solely applicable in case of a landslide failure with a stipulated slip surface and with a consistent decline of a determined slide direction. Such a method was developed in the article published earlier, which provided then its basic assumptions and the equilibrium formulations. The following publication thereof, presents overall suppositions for this method as well as its modification involving the resultant forces brought to the equilibrium with the generalized slide direction. Apart from that, a comparative analysis was carried out on the impact of this modification applicability of the obtained results with regard to the STAB-3D method. The algorithm was also presented concerning the modified method with its results being compared to a couple of selected methods LEM (limit equilibrium method). The undertaken analysis reveals that the modified MSTAB-3D method determines stability indicators that are very similar to its earlier version. Moreover, the results occur to be also approximating the values obtained in the course of other methods with regard to the flat cross-section analysis.

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Glazkov, A. A., A. V. Kuznetsov, V. A. Kuznetsov, M. A. Gurkina y L. Yu Kostina. "EXPERIMENTAL ESTIMATION OF THE OPTIMAL INTERVAL BETWEEN STITCHES OF AN ONE-ROW INTESTINAL SUTURE WITH REGARD TO TIGHTNESS". Sibirskij medicinskij vestnik 6, n.º 3 (2022): 29–34. http://dx.doi.org/10.31549/2541-8289-2022-6-3-29-34.

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Mastery of the intestine suture skills is one of the main competencies of a surgeon. Most of the available know¬ledge on the technical implementation of the intestinal suture is empirical, obtained over the years of the a¬uthor's practice, and transferred by him to the pages of his written work. In this regard, the study of such technical aspects of the implementation of an one-row intestinal suture is an important direction. The aim of the research is to perform a comparative evaluation of one-row extramucosal intestinal anastomoses realized with different stitch spacing. The study was carried out on preparations of the porcine small intestine after the formation of an one-row extramucosal intestinal anastomosis with different intervals between stitches. After that, an estimation of the tightness, execution time and number of stitches between study groups, was performed. The tightness was assessed by making a hydraulic test to determine the leakage pressure – the intraluminal pressure at which leakage occurred through the suture line. In the course of the study, the optimal interval between stitches was determined when applying an one-row intestinal anastomosis formed on the porcine small intestine.

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Shkrabak, Roman Vladimirovich. "Estimation of the performance of automotive engines by the results of their diagnosis under operating conditions". Agrarian Scientific Journal, n.º 3 (28 de marzo de 2022): 103–6. http://dx.doi.org/10.28983/asj.y2022i3pp103-106.

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The need for food supply for the population has been and remains the most important component of the life of the world's population. In connection with the growth of the population, this need will grow. Considering that food production requires enormous and constant work in the bosom of the Earth's biosphere, measures are being taken to alleviate working conditions, increase its efficiency, safety and efficiency. In this regard, the growth of electromechanization and automation of technological processes in the agro-industrial complex is an inevitability not only of the past, but also of the current century. With regard to agricultural production, the decisive factor in this direction is the use of mobile agricultural units with piston motor tractor engines. The latter are characterized by the peculiarity of reducing efficiency as they approach the amortization period, up to complete failure (i.e., termination of performance). In this regard, specialists are developing methods and tools for diagnosing the operability of auto-tractor engines in order to restore it in a timely manner. For this purpose, an innovative device has been proposed for diagnosing the operability of these engines. The article provides a diagram of the device, a description of the principle of its operation to achieve the set goal under operating conditions. The constituent structural elements of the device are deficient-free and affordable. The device combined with their use is not structurally difficult and allows one to obtain reliable results on assessing the performance of engines according to their measured characteristic indicators under operating conditions.

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Tesis sobre el tema "Estimation de la direction du regard"

Lablack, Adel. "Estimation du regard dans un environnement contrôlé". Phd thesis, Université des Sciences et Technologie de Lille - Lille I, 2010. http://tel.archives-ouvertes.fr/tel-00841161.

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L'objectif principal de mon travail de thèse est l'extraction de la direction du regard (attention visuelle) d'une personne à partir de la vidéo. Cette analyse est effectuée dans un environnement composé d'une scène cible et d'une zone d'observation. La scène cible est une région d'intérêt définie pour être analysée (e.g. un écran plasma large, une image projetée sur un mur, une affiche publicitaire, un linéaire dans un magasin, ou la vitrine d'un magasin). La zone surveillée quant à elle est l'emplacement d'où les personnes regardent la scène cible (e.g. la rue, un couloir ou bien les allées d'un supermarché). Les connaissances qui sont extraites sont alors utilisées pour comprendre le comportement visuel de personnes ainsi que pour la réorganisation de la scène cible. Pour atteindre cet objectif, nous proposons une approche basée sur l'estimation de l'orientation de la tête et la projection du champ visuel pour localiser la région d'intérêt. Nous avons utilisé une méthode d'estimation de l'orientation de la tête basée sur l'apparence globale et sur un modèle cylindrique, et une méthode de projection géométrique pour extraire les régions d'intérêts basée sur les données physiologiques de la vision humaine. L'analyse du comportement visuel des personnes a été effectuée à l'aide d'un ensemble de métriques. Les méthodes proposées ont été validées sur des données vidéos et images.

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Dahmane, Afifa. "Estimation du regard à partir de la vidéo". Thesis, Lille 1, 2015. http://www.theses.fr/2015LIL10010/document.

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L'objectif de cette thèse est l'estimation de la pose de la tête humaine à partir d'imagesmonoculaires. Le but est d'avoir un retour d'information de l'utilisateur sur l'orientationde son regard, et ce, de manière non-intrusive. Ce domaine de recherche est très actifcompte tenu de l'évolution des interfaces de communication entre l'homme et la machine,d'autant plus que plusieurs défis sont toujours ouverts. Notamment, la robustesse dusystème, son invariabilité à l'identité des personnes et à l'illumination ainsi que la qualitédu matériel de capture requis.L'approche que nous avons proposée est basée sur la symétrie bilatérale du visage.Nous utilisons des caractéristiques extraites de la symétrie pour estimer la pose de latête par le biais de l'apprentissage. Les caractéristiques utilisées sont géométriques maisextraites de manière globale à partir de toute la texture du visage, sans que des pointsou des contours spécifiques ne soient requis.Ces caractéristiques ont été validées expérimentalement à l'aide de bases d'images etde vidéos publiques dédiées à l'estimation de la pose de la tête. L'apprentissage superviséainsi que la régression sont utilisés pour construire des modèles de poses. Ces modèles ontété testés sur des séquences vidéo indépendantes des bases utilisées pour l'apprentissage.L'erreur d'estimation a été calculée et les résultats sont supérieurs ou équivalents à l'étatde l'art
The aim of this thesis is to estimate the pose of a human head frommonocular images. The goal is to have a feedback from the user on the direction of hisgaze, and this is done in a non-intrusive manner. This area of research is very activegiven the evolution of the communication interfaces between a human and a machine,especially as many challenges are still there. In particular, the robustness of the system,its invariance to the identity of individuals and enlightenment.The approach we propose is based on the bilateral symmetry of the face. We usefeatures extracted from the symmetry to estimate head pose through learning. Thefeatures used are geometric but extracted holistically from the whole texture of the face,without the need for specifc points or contours.These features have been experimentally validated by means of publicly availabledatabases of images and videos dedicated to head pose estimation. Supervised learningand regression have been used to build models of poses. These models have been testedon video sequences different from the bases used for learning. The estimation error hasbeen calculated and the results are superior or equivalent to the state of the art

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Dahmane, Afifa. "Estimation du regard à partir de la vidéo". Electronic Thesis or Diss., Lille 1, 2015. http://www.theses.fr/2015LIL10010.

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Jin, Nan. "ModSETS : a model-driven stereo eye tracking system : application in the medical field". Electronic Thesis or Diss., Aix-Marseille, 2020. http://www.theses.fr/2020AIXM0339.

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La plupart des systèmes de suivi de l’œil existants ne fournissent que des analyses précises et en temps réel des mouvements oculaires 2D (horizontaux et verticaux) dans des conditions de laboratoire. Ils sont en général insuffisants pour les applications du domaine médical, parce que leur robustesse est souvent mise à l'épreuve dans la pratique et la mesure du mouvement torsionnel de l’œil est ignorée la plupart du temps. Cela augmente la difficulté d'interprétation des données collectées et peut donc affecter la qualité du diagnostic médical. Un système de suivi de l’œil en stéréophotogrammétrie piloté par modèle (ModSETS) est proposé dans cette thèse de doctorat, pour offrir une analyse précise, robuste et en temps réel des mouvements oculaires 3D (horizontaux, verticaux et torsionnels) pour les applications médicales. La performance de ModSETS dans le suivi des mouvements oculaires 2D est démontrée par un ⟪gaze test⟫. Il a montré une bonne précision (i.e., d'environ 1 °) dans l'estimation du regard qui est conforme aux exigences de nombreuses applications médicales. La robustesse de ModSETS dans des conditions normales d’utilisation est également confirmée, traduit par un taux de réussite élevé dans la segmentation de la pupille (i.e., 91,4%). Certains résultats encourageants ont été obtenus dans la mesure des mouvements torsionnels de l’œil, même s'il est difficile d’effectuer une évaluation quantitative avec le matériel actuel. Le principe d’un tel système de suivi de l’œil en stéréophotogrammétrie piloté par modèle (ModSETS) est validé. Il montre un grand potentiel dans le suivi des mouvements oculaires 3D pour les applications du domaine médical
Most current eye tracking systems only provide accurate and real-time analysis of 2D (horizontal and vertical) eye movement in laboratory conditions. It is usually insufficient for medical applications, because their robustness is often challenged in practice and the measurement of eye torsion is almost ignored. This increases the difficulty of data interpretation and may thus affect the quality of medical diagnosis. A Model-driven Stereo Eye Tracking System (ModSETS) is proposed in this Ph.D. thesis, to provide accurate, robust, and real-time analysis of 3D (horizontal, vertical and torsional) eye movement for medical applications. The performance of ModSETS in 2D eye movement tracking is proved through a gaze test. It showed a good accuracy (i.e., of about 1°) in gaze estimation that is compliant with the requirements of many medical applications. The robustness of ModSETS in practical conditions is also confirmed, which is reflected by a high success rate in pupil segmentation (i.e., 91.4%). Some encouraging results of eye torsion measurement were obtained, even though it is difficult to make a quantitative assessment with current hardware. Therefore, the principle of ModSETS (Model-driven Stereo Eye Tracking System) is validated and shows great potential in 3D eye movement tracking for medical applications

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Masson, Clément. "Direction estimation using visual odometry". Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-169377.

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This Master thesis tackles the problem of measuring objects’ directions from a motionlessobservation point. A new method based on a single rotating camera requiring the knowledge ofonly two (or more) landmarks’ direction is proposed. In a first phase, multi-view geometry isused to estimate camera rotations and key elements’ direction from a set of overlapping images.Then in a second phase, the direction of any object can be estimated by resectioning the cameraassociated to a picture showing this object. A detailed description of the algorithmic chain isgiven, along with test results on both synthetic data and real images taken with an infraredcamera.
Detta masterarbete behandlar problemet med att mäta objekts riktningar från en fastobservationspunkt. En ny metod föreslås, baserad på en enda roterande kamera som kräverendast två (eller flera) landmärkens riktningar. I en första fas används multiperspektivgeometri,för att uppskatta kamerarotationer och nyckelelements riktningar utifrån en uppsättningöverlappande bilder. I en andra fas kan sedan riktningen hos vilket objekt som helst uppskattasgenom att kameran, associerad till en bild visande detta objekt, omsektioneras. En detaljeradbeskrivning av den algoritmiska kedjan ges, tillsammans med testresultat av både syntetisk dataoch verkliga bilder tagen med en infraröd kamera.

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Muhamed, Rias. "Direction of arrival estimation using antenna arrays". Thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-10022008-063154/.

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Patriksson, Alfred. "Radio signal DOA estimation : Implementing radar signal direction estimation on an FPGA". Thesis, Linköpings universitet, Datorteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-157144.

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This master’s thesis covers the design and implementation of a monopulse directionof arrival (DOA) estimation algorithm on an FPGA. The goal is to implement a complete system that is capable of estimating the bearing of an incident signal. In order to determine the estimate quality both a theoretical and practical noise analysis of the signal chain is performed. Special focus is placed on the statistical properties of the transformation from I/Q-demodulated signals with correlated noise to a polar representation. The pros and cons for three different methods of calculating received signal phasors are also covered.The system is limited to two receiving channels which constrains this report to a 2D analysis. In addition the used hardware is limited to C-band signals. We show that an FPGA implementation of monopulse techniques is definitely viable and that an SNR higher than ten dB allows for a gaussian approximation of the polar representationof an I/Q signal.

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Mazeyev, Yuri. "Direction estimation on 3D-tomography images of jawbones". Thesis, Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-1661.

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The present work expose a technique of estimation of optimal direction for placing dental implant. A volumetric computed tomography (CT) scan is used as a help of the following searches. The work offers criteria of the optimal implant placement direction and methods of evaluation on direction’s significance. The technique utilizes structure tensor to find a normal to the jawbone surface. Direction of that normal is then used as initial direction for search of optimal direction.

The technique described in the present work aimed to support doctor’s decisions during dental implantation treatment.

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Rippon, Lee. "Sheet profile estimation and machine direction adaptive control". Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/61466.

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Sheet and film process control is often structured such that separate controllers and actuators are dedicated to either the temporal (i.e, machine direction) variations or the spatial (i.e., cross direction) variations. The dedicated machine direction (MD) and cross direction (CD) controllers require separate measurements of the MD and CD sheet property profiles, respectively. The current industrial standard involves a traversing sensor that acquires a signal containing both MD and CD property variations. The challenge then becomes how does one extract separate MD and CD profiles from the mixed signal. Numerous techniques have been proposed, but ultimately the traditional exponential filtering method continues to be the industrial standard. A more recent technique, compressive sensing, appears promising but previous developments do not address the industrial constraints. In the first part of this thesis the compressive sensing technique is developed further, specifically with regards to feasibility of implementation. A comparative analysis is performed to determine the benefits and drawbacks of the proposed method. Model-based control has gained widespread acceptance in a variety of industrial processes. To ensure adequate performance, these model-based controllers require a model that accurately represents the true process. However, the true process is changing over time as a result of the various operating conditions and physical characteristics of the process. In part two of this thesis an integrated adaptive control strategy is introduced for the multi-input multi-output MD process of a paper machine. This integrated framework consists of process monitoring, input design and system identification techniques developed in collaboration with multiple colleagues. The goal of this work is to unify these efforts and exhibit the integrated functionality on an industrial paper machine simulator.
Applied Science, Faculty of
Chemical and Biological Engineering, Department of
Graduate

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Wirfält, Petter, Guillaume Bouleux, Magnus Jansson y Petre Stoica. "Optimal prior knowledge-based direction of arrival estimation". KTH, Signalbehandling, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-109489.

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In certain applications involving direction of arrival (DOA) estimation the operator may have a-priori information on some of the DOAs. This information could refer to a target known to be present at a certain position or to a reflection. In this study, the authors investigate a methodology for array processing that exploits the information on the known DOAs for estimating the unknown DOAs as accurately as possible. Algorithms are presented that can efficiently handle the case of both correlated and uncorrelated sources when the receiver is a uniform linear array. The authors find a major improvement in estimator accuracy in feasible scenarios, and they compare the estimator performance to the corresponding theoretical stochastic Cramer-Rao bounds as well as to the performance of other methods capable of exploiting such prior knowledge. In addition, real data from an ultra-sound array is applied to the investigated estimators.

QC 20130107

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Más fuentes

Libros sobre el tema "Estimation de la direction du regard"

1976-, Gokeda Gopal y Yu Yiqiang, eds. Introduction to direction-of-arrival estimation. Boston: Artech House, 2010.

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1962-, Chandran Sathish, ed. Advances in direction-of-arrival estimation. Boston: Artech House, 2005.

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Benjamin, Friedlander, Knovel (Firm) y ScienceDirect (Online service), eds. Classical and modern direction-of-arrival estimation. Amsterdam: Academic Press/Elsevier, 2009.

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Foutz, Jeffrey, Andreas Spanias y Mahesh K. Banavar. Narrowband Direction of Arrival Estimation for Antenna Arrays. Cham: Springer International Publishing, 2008. http://dx.doi.org/10.1007/978-3-031-01537-3.

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Dey, Nilanjan y Amira S. Ashour. Direction of Arrival Estimation and Localization of Multi-Speech Sources. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73059-2.

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Bolt, Daniel. Estimation of item dimensional measurement direction using conditional covariance patterns. Newtown, PA: Law School Admission Council, 2002.

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National Research Council (U.S.). Committee for Determination of the State of the Practice in Metropolitan Area Travel Forecasting., ed. Metropolitan travel forecasting: Current practice and future direction. Washington, D.C: Transportation Research Board, 2007.

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Fund, International Monetary, ed. Improving the estimation methodology of monthly data in direction of trade statistics. Washington, D.C: International Monetary Fund, 1994.

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Lau, Chun Kit Edwin. Minimum norm mutual coupling compensation with applications in matrix pencil direction of arrival estimation. Ottawa: National Library of Canada, 2003.

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Un regard qui te fracasse: Propos sur le théâtre et la mise en scène. Montréal, Quebec: Boréal, 2014.

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Capítulos de libros sobre el tema "Estimation de la direction du regard"

Bensebaa, Amina, Slimane Larabi y Neil M. Robertson. "Head Direction Estimation from Silhouette". En Image Analysis and Processing – ICIAP 2013, 340–50. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-41181-6_35.

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Gamba, Jonah. "Direction of Arrival (DOA) Estimation". En Radar Signal Processing for Autonomous Driving, 65–86. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-9193-4_6.

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Foutz, Jeffrey, Andreas Spanias y Mahesh K. Banavar. "Nonadaptive Direction of Arrival Estimation". En Narrowband Direction of Arrival Estimation for Antenna Arrays, 17–47. Cham: Springer International Publishing, 2008. http://dx.doi.org/10.1007/978-3-031-01537-3_3.

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Foutz, Jeffrey, Andreas Spanias y Mahesh K. Banavar. "Adaptive Direction of Arrival Estimation". En Narrowband Direction of Arrival Estimation for Antenna Arrays, 49–53. Cham: Springer International Publishing, 2008. http://dx.doi.org/10.1007/978-3-031-01537-3_4.

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Metkar, Shilpa y Sanjay Talbar. "Conclusion and Research Direction". En Motion Estimation Techniques for Digital Video Coding, 61–64. India: Springer India, 2013. http://dx.doi.org/10.1007/978-81-322-1097-9_5.

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Al Mazrouei, Suood y Andrzej Śluzek. "Simple Methodology for Eye Gaze Direction Estimation". En Recent Challenges in Intelligent Information and Database Systems, 241–53. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-1685-3_20.

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Zhao, Hongwei y Zichun Zhang. "Direction of Arrival Estimation of Spread Spectrum Signal". En Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 589–97. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-44751-9_50.

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Qiao, Yulong y Ying Zhao. "Rotation Invariant Texture Classification Using Principal Direction Estimation". En Advances in Intelligent Systems and Computing, 247–56. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-12286-1_25.

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Wu, Renbiao, Qiongqiong Jia, Lei Yang y Qing Feng. "Application of RELAX in Direction of Arrival Estimation". En Principles and Applications of RELAX: A Robust and Universal Estimator, 159–85. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6932-2_5.

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Shen, Cheng-Dong, Tie-Jun Li y Si-Kun Li. "A Predictive Direction Guided Fast Motion Estimation Algorithm". En Computer Analysis of Images and Patterns, 188–96. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/11556121_24.

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Actas de conferencias sobre el tema "Estimation de la direction du regard"

Chichinina, T., R. Avila-Carrera y V. Bezkhodarnov. "Seismic Anisotropy Analysis of Fractured Reservoirs". En SPE Caspian Technical Conference and Exhibition. SPE, 2023. http://dx.doi.org/10.2118/217536-ms.

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Summary Vertical fractures cause azimuthal anisotropy. To predict the fractures’ azimuth, we use anisotropy analysis of four seismic attributes: NMOA, AVOA, QVOA and Shear-Wave-Splitting (SWS). Namely: the first NMOA-attribute means "Normal-Move-Out velocity versus Azimuth". The second attribute AVOА stands for "Amplitude Versus Offset and Azimuth". The amplitude is understood as the reflection coefficient of the longitudinal (PP) wave. In the SWS analysis, we separate two shear waves from each other (S1 and S2). The S1 -wave has its polarization vector parallel to the plane of the fractures, and the other (S2) is perpendicular. The delay time Δt between the S1-wave and the S2 -wave is proportional to the fracture concentration. Regarding the NMOA, the unequal time of arrival of the PP-wave in different azimuths is due to the velocity anisotropy induced by fractures. The azimuthal variation of the NMO velocity is described by the NMO ellipse. The spatial time-field surface for the reflected PP-wave can be represented as a hyperboloid with an elliptical section, which is the so-called NMO ellipse. The minor axis of the ellipse points to the fractures’ azimuth (α0). In addition, the AVOA attribute is used for fracture characterization. The azimuthal variation of the AVO gradient can be represented as an ellipse, whose minor axis (Bmin) shows the fracture direction azimuth. We can estimate the concentration of fractures by the value of its major axis (Bmax). We apply an integrated approach, that is, the analysis of four anisotropy attributes: NMOA, AVOA, SWS and QVOA. The QVOA-attribute means "Q Versus Offset and Azimuth". Q is a quality factor. The inverse (the reciprocal) of the quality factor 1/Q is a measure of the attenuation of the seismic-wave energy. When analyzing the azimuthal variation of an anisotropy attribute, it is considered that a fractured reservoir can be represented as a model of a transversely isotropic medium with a horizontal axis of symmetry (HTI). With regard to the latter QVOA method, we come to the conclusion that in order to achieve the highest accuracy in the angle of the fracture-direction estimation, it is best to use our new "canonical" formula derived for the Q−1(θ, φ)-attenuation function, which gives the highest accuracy in estimating the azimuth of the fracture direction compared to its former approximations. In the former version of QVOA method, we used a simplified approximation formula of the attenuation (Q−1(θ, φ)) in the form A + Bx + Cx2, (where x = sin2θcos2(φ − φ0), as well as its truncated approximation A + Bx. However, to achieve the highest accuracy in estimating fracture direction, it is best to use our new "canonical" formula of Q−1(θ, φ)-function, which gives the best accuracy in estimating the azimuth angle of fractures’ direction compared to those simple approximations. Thus, our improved QVOA method gives an excellent absolute accuracy of more than 0.25 degrees.

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Figaschewsky, Felix, Arnold Kühhorn, Bernd Beirow, Thomas Giersch, Jens Nipkau y Ferdinand Meinl. "Simplified Estimation of Aerodynamic Damping for Bladed Rotors: Part 2 — Experimental Validation During Operation". En ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-56458.

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Due to increasing requirements of future engine projects, much effort has been spent on the design of more efficient turbomachinery blades in the recent years. Besides aerodynamic efficiency constraints, these designs need to meet structural criteria ensuring that they are safe and robust with respect to High Cycle Fatigue (HCF). The estimation of the resonant vibration amplitude is done based on the aerodynamic force and the overall damping level. Since, for many applications the contribution of mechanical damping is often rather low compared to the aerodynamic counterpart, the determination of the aerodynamic damping is vital for the estimation of the forced vibration response. This second part is meant to contribute to a simplified computation of the aerodynamic damping during operation by making additional assumptions: The investigated mode family shall not suffer from flutter, has a high reduced frequency and the influence of adjacent blades is negligible. Under these circumstances a simplified approach can be introduced that allows for the computation of the mean value of the aerodynamic damping based on a steady state CFD solution of the regarded stage. It is well known, that the aerodynamic damping of a blade mode family depends on the inter blade phase angle (IBPA) and its direction of propagation, which is not covered by the simplified approach. For higher modes the difference between the minimum and maximum damping is often low and the mean value is a good approximation, whereas for fundamental modes there is often a significant difference. However, it is shown that considering a mistuned vibration response of the rotor, the expected value of the mistuned damping exhibits the mean value of IBPA-dependent aerodynamic damping. CFD simulations of an oscillating airfoil indicate a certain validity range of the simplified approach based on a modified reduced frequency and inlet Mach number, which allows to determine for which industrial applications the approach is most suitable. Finally, this range of validity is verified with experimentally determined overall damping values from strain gauge measurements during operation for 2 different industrial applications, an axial compressor stage of a jet engine and a radial turbine stage of a turbocharger.

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Sharafutdinov, Ramil Faizyrovich, Rim Abdullovich Valiullin, Denis Vladimirovich Kosmylin, Ayrat Shaikhullinovich Ramazanov, Vladimir Yakovlevich Fedotov, Vladimir Vladimirovich Bajenov y Alik Islamgaleevich Imaev. "The Use of Induction Heating in Assessing the Technical Condition and Operating Intervals in Producing Wells". En SPE Russian Petroleum Technology Conference. SPE, 2021. http://dx.doi.org/10.2118/206625-ms.

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Abstract The paper considers two approaches based on the use of an induction heater: the first is a "large thermal anemometer", in which the casing is heated by induction action and the problem of determining column flows, determining the flow rate and the inflow profile is solved by analyzing the formation of thermal labels (Valiullin et al., 2001, Valiullin et al., 2002), the second is a "small radial-azimuth thermal anemometer - small thermal anemometer", where an induction heater is used to heat the element of the thermal anemometer. In the second case, the problem of estimating the flow direction and estimating the flow rate is solved. For the first approach, "large thermal anemometer", the results of theoretical and experimental studies of the temperature field distribution in a physical model as close as possible to the design of a real oil well, with induction heating of the column taking into account the column flow of liquid. The influence of forced convection on the readings of temperature sensors with different locations in the well (pressed against the inner wall of the column, along the axis of the device) is studied. The advantages of the azimuthal location of temperature sensors when measuring temperature anomalies of the column motion of a liquid are shown. It is established that with the help of an azimuthally distributed temperature probe, it is possible to determine the column flow "from above" when measuring above and below the heating point of the inductor. The optimal time intervals for measuring the temperature at which the allocation of channels for the column movement of the liquid is most effective are determined. For the second approach, "small thermal anemometer", the design features of a borehole thermoconductive indicator of the inflow of indirect heating, which is heated using an induction heater, are considered. Using an induction heater, a uniform heating of the housing of the borehole thermoconductive inflow indicator is achieved. Due to the developed design, the sensor is able to detect the presence of a liquid flow directed perpendicular to the body, and determine the direction of this flow. The "large thermal anemometer" technology has been tested, which has shown its effectiveness and prospects for using it to determine backwater flows (column circulation), but there are still questions related to assessing the effect of thermal convection on the recorded temperature and the possibility of diagnosing the column circulation channel (Valiullin et al., 2017). The article (Valiullin et al., 2008) describes the developed equipment of the "active thermometry" method for conducting geophysical studies of wells, while the classical location of temperature sensors along the axis of the device is used in the borehole probe, which does not make it possible to determine the channels of the circulation channels. The sensors located in this way are more susceptible to the influence of thermal convection, while the change in the velocity and composition of the fluid can be estimated as the presence of circulation channel. In this regard, work was carried out to reduce the influence of convection, the design of the temperature probe was developed, which allows minimizing the influence of thermal convection and increasing the efficiency of the allocation of circulation channel. Thermoanemometers, better known as thermoanemometer sensors (borehole thermoconductive inflow indicator), have been widely used in field geophysics (Zhuvagin et al., 1973). The traditional sensor of a thermal anemometer, with all its advantages, is not without disadvantages, and one of these is the inability to unambiguously determine the presence and direction of the fluid flow directed perpendicular to its body. The solution of this problem would allow, along with the known solved problems, to increase the information content of the thermoanemometer sensor, namely, in terms of detecting the leakiness of the column, evaluating the operating intervals at low debits, the flow direction. This problem is solved in this work on the basis of the use of an indirect induction heater.

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Iseki, Toshio. "Extended Bayesian Estimation of Directional Wave Spectra". En ASME 2004 23rd International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/omae2004-51609.

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The Bayesian modelling procedure has been extended to estimate time-varying directional wave spectra. In the proposed method, the hull of a ship is regarded as a wave sensor and the time history data of ship motions is analyzed to evaluate cross spectra. In this concept, a special attention should be paid to changes of the directional wave spectrum because the ship is moving and the location at sea is changing continuously. Therefore, the extended Bayesian estimation is based on the cross spectra evaluated at different times and the fluctuation of wave spectrum is taken into account. In order to examine the reliability of the proposed method, data of onboard experiments were analyzed. Comparisons between the results of the proposed method and visual observations show good agreements.

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Chaturvedi, Amal y H. Howard Fan. "Compressive wideband direction of arrival estimation". En 2015 38th International Conference on Telecommunications and Signal Processing (TSP). IEEE, 2015. http://dx.doi.org/10.1109/tsp.2015.7296438.

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Yalcin, Hulya y M. Husrev Cilasun. "Deep learning based autonomous direction estimation". En 2016 24th Signal Processing and Communication Application Conference (SIU). IEEE, 2016. http://dx.doi.org/10.1109/siu.2016.7496072.

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Radlak, Krystian, Michal Kawulok, Bogdan Smolka y Natalia Radlak. "Gaze direction estimation from static images". En 2014 IEEE 16th International Workshop on Multimedia Signal Processing (MMSP). IEEE, 2014. http://dx.doi.org/10.1109/mmsp.2014.6958803.

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Sayrafian-Pour, K. y D. Kaspar. "Source-Assisted Direction Estimation Inside Buildings". En Proceedings IEEE INFOCOM 2006. 25TH IEEE International Conference on Computer Communications. IEEE, 2006. http://dx.doi.org/10.1109/infocom.2006.225.

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Machado, Gabriel G., Kd M. Raziul Islam, Vincent Fusco y M. Ali Babar Abbasi. "Amplitude Only Direction of Arrival Estimation". En 2023 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC). IEEE, 2023. http://dx.doi.org/10.1109/imoc57131.2023.10379750.

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Dongdong Nie, Lizhuang Ma, XueZhong Xiao y Shuangjiu Xiao. "Optimization Based Fingerprint Direction Field Estimation". En 2005 IEEE Engineering in Medicine and Biology 27th Annual Conference. IEEE, 2005. http://dx.doi.org/10.1109/iembs.2005.1615929.

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Informes sobre el tema "Estimation de la direction du regard"

Simizu, Hiroaki y Tomaso Poggio. Direction Estimation of Pedestrian from Images. Fort Belvoir, VA: Defense Technical Information Center, agosto de 2003. http://dx.doi.org/10.21236/ada459729.

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Adams, Danica L. Direction of Arrival Estimation Using a Reconfigurable Array. Fort Belvoir, VA: Defense Technical Information Center, mayo de 2005. http://dx.doi.org/10.21236/ada436608.

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Brunelli, Roberto. Estimation of Pose and Illuminant Direction for Face Processing. Fort Belvoir, VA: Defense Technical Information Center, noviembre de 1994. http://dx.doi.org/10.21236/ada295655.

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Peli, Tamar. Evaluation of a Wideband Direction Estimation Algorithm for Acoustic Arrays. Fort Belvoir, VA: Defense Technical Information Center, febrero de 1988. http://dx.doi.org/10.21236/ada473337.

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Lyzenga, David R. Estimation of Ocean Surface Wind Speed and Direction From Polarimetric Radiometry Data. Fort Belvoir, VA: Defense Technical Information Center, septiembre de 2008. http://dx.doi.org/10.21236/ada533831.

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Du, Y., P. W. Vachon y J. Wolfe. Wind direction estimation from SAR images of the ocean using wavelet analysis. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2002. http://dx.doi.org/10.4095/219819.

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Paulraj, A. y T. Kailath. Direction of Arrival Estimation of Eigenstructure Methods with Unknown Sensor Gain and Phase. Fort Belvoir, VA: Defense Technical Information Center, marzo de 1985. http://dx.doi.org/10.21236/ada160027.

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Rangaswamy, Muralidhar, M. Greco y F. Gini. Direction of Arrival (DOA) Estimation and Multi-User Interference in a Two-Radar System. Fort Belvoir, VA: Defense Technical Information Center, septiembre de 2009. http://dx.doi.org/10.21236/ada541138.

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Jamali, M. M., S. C. Kwatra y Ravindranath Suria. A Parallel and Pipelined Architecture for Estimation of Direction of Arrival Using a Bilinear Transformation Method. Volume 3. Fort Belvoir, VA: Defense Technical Information Center, agosto de 1993. http://dx.doi.org/10.21236/ada270137.

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Padhye, Suyash, Isaiah Mwamba, Kyubyung Kang, Samuel Labi y Makarand Hastak. Safety, Mobility, and Cost Benefits of Closing One Direction of the Interstate in Rural Areas During Construction Work. Purdue University, 2021. http://dx.doi.org/10.5703/1288284317345.

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With specific regard to interstates in the rural area, Indiana Department of Transportation (INDOT) has expressed a need for research that sheds light on this Maintenance of Traffic (MOT) issue so the agency [INDOT and the contractor] can make informed decisions regarding the crossover sections versus the closure in one direction with detour roads. A number of studies have investigated the advantages and disadvantages of various MOT strategies; however, there is no specific study that can help INDOT traffic engineers and design engineers make decisions by comparing direct and indirect benefits of crossovers and detours (full lane closures). This research examined the advantages and disadvantages of entirely closing one direction of traffic over traditional work zone techniques (such as partial lane closure through median crossover) from the perspectives of the agency, road users, and the community. In the case of full closure, the study (a) examined the alternative MOT strategies and best practices through an extensive literature review and survey of agencies (b) investigated risk, benefit, and costs associated with selected detour routes (c) validated the identified critical factors through case studies in Indiana and at other states, and (d) implemented best practices in an expected project to evaluate the safety, mobility, and cost benefits of closing one direction. Through the literature review and four case studies, eleven KPIs for MOT strategy developments were identified. This study prioritized these KPIs through the survey questionnaire. The top five KPIs are (1) safety, (2) mobility, (3) budget constraint, (4) project duration, (5) complexity of project sites. Based on these KPIs and other findings presented in Section 4.3.3, this study has proposed a comparison tool for predetermined MOT strategies in the form of a flow-chart. This tool is followed by the scores or weights associated with each KPI. These scores are normalized—i.e., the most important KPI which is safety, has the maximum weightage 1 and rest of the KPIs are weighed relatively. INDOT has a set of editable documents which are references for making MOT decisions. This proposed flow-chart tool will “walk” the INDOT team through the use of these spreadsheets corresponding to the identified KPIs through this study. It will be at the discretion of the INDOT team as to which KPIs are relevant to the situation at hand. Therefore, the flow-chart tool is flexible to incorporate the dynamic nature of MOT strategy selection.

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