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A multi camera system for soccer player performance evaluation

A multi camera system for soccer player performance evaluati...

引用

ACM/IEEE International Conference on Distributed Smart Cameras, ICDSC

作者： Marco Leo Tiziana D'Orazio Mohan Trivedi Institute of Intelligent Systems of Automation Bari Italy Electrical and Computer Vision Engineering Laboratory University of California San Diego CA USA

This paper presents a multi-view approach to performance evaluation of soccer players by the analysis of the posture evolution. Some body-appearance features have been extracted and the most significant ones have been used to model the activity of the players involved in play. Continuous hidden Markov models have been used to model the temporal evolution of the body features in a multiple view decision making approach. Tests were carried out on different sequences of player activities extracted from matches played during the Italian ldquoSerie Ardquo Championship.

关键词： Performance analysis Hidden Markov models Data mining Testing Game theory Information analysis Multimedia communication Broadcasting Smart cameras intelligent systems

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Instantaneous baseline damage detection using a low power guided waves system 7

Instantaneous baseline damage detection using a low power gu...

引用

7th International Workshop on Structural Health Monitoring: From System Integration to Autonomous systems, IWSHM 2009

作者： Park, S. Anton, S.R. Inman, D.J. Kim, J.-K. Ha, D.S. Department of Civil and Environmental Engineering Sungkyunkwan University Suwon Gyeonggi440-746 Korea Republic of Center for Intelligent Material Systems and Structures Dept. of Mechanical Engineering Virginia Tech BlacksburgVA24061 United States VTVT Laboratory Dept. of Electrical and Computer Engineering Virginia Tech BlacksburgVA24061 United States

ISBN: (纸本)9781605950075

In recent years, new structural health monitoring (SHM) methodologies with a concept of "instantaneous baseline damage detection" are being developed by many researchers, since it has been found that the most of SHM technologies are too vulnerable to environmental and/or operational variations. In this context, this paper presents online instantaneous baseline structural damage detection using a low cost and low power, in-situ guided waves-SHM system. Firstly, four small, low cost and light weight smart piezoelectric ceramic (PZT) patches are surface-mounted and assumed to have the same bonding conditions to detect structural defects on an aluminum plate. Then, a miniaturized low power guided waves-SHM system with a digital signal processing (DSP) module is employed for signal generation/excitation, signal sensing, and data processing. The instantaneous baseline damage detection based on discrete wavelet transform (DWT) analysis is carried out on the DSP module. Finally, effects of Lamb waves due to artificial "cut-damage' with different locations are investigated using both "pitch-catch" and "pulse-echo" wave propagation schemes. Conclusively, this study shows a good potential for online and in-situ crack monitoring on panel structures such as an aircraft wing.

关键词： Damage detection

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Mining discriminative adjectives and prepositions for natural scene recognition

Mining discriminative adjectives and prepositions for natura...

引用

IEEE computer Society Conference on computer Vision and Pattern Recognition Workshops (CVPRW)

作者： Bangpeng Yao Juan Carlos Niebles Li Fei-Fei Department of Computer Science Princeton University NJ USA Robotics and Intelligent Systems Group Universidad del Norte Colombia Department of Electrical Engineering Princeton University NJ USA

This paper presents a method that considers not only patch appearances, but also patch relationships in the form of adjectives and prepositions for natural scene recognition. Most of the existing scene categorization approaches only use patch appearances or co-occurrence of patch appearances to determine the scene categories, but the relationships among patches remain ignored. Those relationships are, however, critical for recognition and understanding. For example, a `beach' scene can be characterized by a `sky' region above `sand', and a `water' region between `sky' and `sand'. We believe that exploiting such relations between image regions can improve scene recognition. In our approach, each image is represented as a spatial pyramid, from which we obtain a collection of patch appearances with spatial layout information. We apply a feature mining approach to get discriminative patch combinations. The mined patch combinations can be interpreted as adjectives or prepositions, which are used for scene understanding and recognition. Experimental results on a fifteen class scene dataset show that our approach achieves competitive state-of-the-art recognition accuracy, while providing a rich description of the scene classes in terms of the mined adjectives and prepositions.

关键词： Layout Road transportation Image representation intelligent robots Image recognition Data mining computer science intelligent systems Histograms

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Micromanipulation using artificial bacterial flagella

Micromanipulation using artificial bacterial flagella

引用

2009 IEEE/RSJ International Conference on intelligent Robots and systems

作者： Li Zhang Jake J. Abbott Lixin Dong Bradley E. Kratochvil Haixin Zhang Kathrin E. Peyer Bradley J. Nelson Multi Scale Robotics Lab Institute of Robotics and intelligent Systems ETH Zurich Zurich Switzerland Department of Mechanical Engineering University of Utah Salt Lake UT USA Department of Electrical and Computer Engineering Michigan State University East Lansing MI USA

Artificial bacterial flagella (ABF) are swimming microrobots that mimic the swimming motion of bacteria. The helical swimmer consists of an InGaAs/GaAs/Cr helical nanobelt tail fabricated by a self-scrolling technique with dimensions similar to a natural flagellum, and a thin soft-magnetic metal ¿head¿ consisting of a Cr/Ni/Au multi-layer. The swimming locomotion of ABF is precisely controlled in 3-D by external rotating magnetic fields. Microsphere manipulation is performed by ABF, and experimental results show that both the position and the orientation of microspheres can be precisely controlled. The propelling force of ABF is in the pico-Newton range. We also describe a swarm-like behavior in which three ABF swim in a pack, indicating the potential to handle several micro objects in parallel. Self-propelled devices such as these are candidates for wireless 6-DOF micro and nanomanipulation tools for handling cellular and sub-cellular objects.

关键词： Microorganisms Chromium Indium gallium arsenide Gallium arsenide Tail Gold Magnetic fields Propulsion Force control Nanoscale devices

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OWA fuzzy linking histogram approach for image retrieval

OWA fuzzy linking histogram approach for image retrieval

引用

International Conference on Computational Cybernetics (ICCC)

作者： Maryam Tayefeh Mahmoudi Maedeh Beheshti Caro Lucas Fattaneh Taghiyareh Knowledge Engineering & Intelligent Systems Group Iran Telecom Research Center Tehran Iran School of Electrical and Computer Engineering University of Tehran Tehran Iran School of computer engineering Iran University of Science and Technology Tehran Iran Control and Intelligent Processing Laboratory University of Tehran Tehran Iran School of Electrical and Computer Engineering College of Engineering University of Tehran Tehran Iran

Color image histograms are very useful tools for content based image retrieval (CBIR) that can be applied on features such as colour, texture and shape. As these kinds of histograms results with large variations between neighbouring bins, they seem so sensitive to any kind of changes such as noise, illumination. To overcome this problem, in this paper, fuzzy linking histogram approach based on OWA aggregation operator is proposed, which is capable of projecting 3-dimensional (L*a*b*) colour histograms into single-dimension. The proposed method have been evaluated and compared with five other related methods in retrieving similar images from the common dataset which is available on http://***/~konkonst. The experimental results on 100 images within two categories of Cat and Sky reveals better performance of the proposed method in comparison with the other mentioned methods.

关键词： Open wireless architecture Joining processes Histograms Image retrieval Colored noise Color Content based retrieval Shape Noise shaping Lighting

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Solution-phase surface reconstruction and structural transformation in MWNTs

Solution-phase surface reconstruction and structural transfo...

引用

IEEE Nanotechnology Materials and Devices Conference (NMDC)

作者： Arunkumar Subramanian Lixin Dong Didi Xu Bradley J. Nelson Center for Integrated Nanotechnologies Sandia National Laboratories Albuquerque USA Institute of Robotics and Intelligent Systems ETH Zurich Zurich Switzerland Electrical and Computer Engineering Michigan State University East Lansing MI USA

We report on structural changes induced in arc-grown multiwalled carbon nanotubes (MWNTs) due to ultrasonic agitation in an aqueous iron nitrate solution. The surface reconstructions were observed to follow three different pathways: (1) transformation from a tubular to a spherical / polyhedral onion-like geometry that involves a lower surface energy, (2) surface reconstruction of shells resulting in NT shrinkage from a larger diameter tube with a hollow core to a smaller diameter one with a solid core, and (3) the creation of highly reactive atomic-scale vacancies on carbon shells with low activation energies in the case of remaining NTs with a hollow core. Upon electron irradiation at extremely low beam intensities (1-2 A/cm 2 ), the NTs with a hollow core have been observed to undergo structural reconstructions that result in shell shrinkage. The demonstrated techniques provide the capability to produce carbon onions in large-scale quantities and allow precision engineering of the geometry of condensed carbon allotropes. In addition, these results offer a route towards creating NTs with increased current densities/specific strength.

关键词： Surface reconstruction Carbon nanotubes Geometry Solids Electron beams Atomic measurements Nanotechnology intelligent robots Iron Magnetic materials

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Noncontact manipulation of Ni nanowires using a rotating magnetic field

Noncontact manipulation of Ni nanowires using a rotating mag...

引用

IEEE Conference on Nanotechnology

作者： Li Zhang Yang Lu Lixin Dong R. Pei Jun Lou Bradley E. Kratochvil Bradley J. Nelson Institute of Robotics and Intelligent Systems ETH Zurich Zurich Switzerland Department of Mechanical Engineering & Materials Science Rice University Houston TX USA Department of Electrical & Computer Engineering Michigan State University East Lansing MI USA

ISBN: (纸本)9781424448326

Ni nanowires (NWs) are driven in water using a rotating magnetic field. The NWs show various locomotion performances under different boundary conditions. Pure rotation occurs when the two ends of the NWs are homogenously constrained. However, if the boundary conditions are different at the two ends of the NWs, tumbling motion, i.e., rotation plus translation, will be generated, which leads to the propulsion of NWs near a wall. These motions of NWs can be steered by the magnetic field. In addition, we present that the two NWs self-assemble to form a single NW with the magnetic field. The results imply that magnetic field is a promising approach for noncontact manipulation of Ni NWs or other 1-D ferromagnetic nanostructures at low Reynolds number aqueous environment in a controllable fashion.

关键词： Nanowires Magnetic fields Nanostructures Propulsion Boundary conditions intelligent robots Biomedical optical imaging Optical sensors Magnetic liquids Electrodes

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Control system for reactor vessel inspection manipulator

Control system for reactor vessel inspection manipulator

引用

IEEE Conference on Control Technology and Applications (CCTA)

作者： Alan Mutka Ivica Draganjac Zdenko Kovacic Zeljko Postruzin Ranko Munk Faculty of EE&C Department of Control and Computer Engineering LARICS-Laboratory of Robotics and Intelligent Control Systems University of Zagreb Zagreb Croatia Organization of Technology Development and Application HRID Limited Zagreb Croatia

In this paper a system for control and 3D visualization of a manipulator for weld inspection of nuclear reactor vessels is described. Based on client-server TCP/IP software architecture, the presented control system enables an operator to perform the entire inspection procedure remotely over a network, avoiding exposure to dangerous radiation which is commonly present in nuclear reactor environments. The developed graphical user interface provides all necessary tools needed for planning robot scan trajectories, their verification on a virtual 3D model and execution on a remote robot. In addition, the weld inspection process can be observed in parallel on a virtual robot and reactor vessel model and on live video streams captured by two special cameras mounted on the robot.

关键词： Control systems Inductors Inspection Welding Parallel robots Visualization TCPIP Software architecture Graphical user interfaces Trajectory

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Minimal Exposure Path Algorithms for Directional Sensor Networks

Minimal Exposure Path Algorithms for Directional Sensor Netw...

引用

GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

作者： Liang Liu Xi Zhang Huadong Ma Beijing Key Laboratory of Intelligent Telecommunication Software and Multimedia Beijing University of Posts and Telecommunications Beijing China Networking and Information Systems Laboratory Department of Electrical and Computer Engineering Texas A and M University College Station TX USA

As a fundamental problem of wireless sensor networks, the minimal exposure path problem corresponding to the sensor network's worst-case coverage plays an important role in the applications for detecting intrusions. However, most existing works about minimal exposure path are based on omnidirectional sensors. In contrast, this paper studies the minimal exposure path problem for directional sensor networks. We first develop a directional sensing model: directional sensitivity model. Then, we formulate the minimal exposure path problem by using two sensing intensity functions: all-sensor intensity function and maximum-sensor intensity function, and generate two weighted grids to convert the minimal exposure path problem into two discrete geometric problems. Based on the above weighted grids, we also develop two approximation algorithms to find the minimal exposure path for the directional sensitive model. We conduct extensive simulations to validate and evaluate our proposed models and algorithms.

关键词： Wireless sensor networks intelligent sensors Intrusion detection Telecommunications Mesh generation Approximation algorithms Sensor systems Information systems Laboratories intelligent networks

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A Coverage-Enhancing Method for 3D Directional Sensor Networks

A Coverage-Enhancing Method for 3D Directional Sensor Networ...

引用

IEEE Annual Joint Conference: INFOCOM, IEEE computer and Communications Societies

作者： H. Ma X. Zhang A. Ming Beijing Key Laboratory of Intelligent Telecommunication Software and Multimedia Beijing University of Posts and Telecommunications Beijing China Networking and Information Systems Laboratory Department of Electrical and Computer Engineering Texas A and M University College Station TX USA

ISBN: (纸本)9781424435128

In conventional directional sensor networks, coverage control for each sensor is based on a 2D directional sensing model. However, 2D directional sensing model cannot accurately characterize the actual application scene of image/video sensor networks. To remedy this deficiency, we propose a 3D directional sensor coverage-control model with tunable orientations. In order to improve the efficiency of target-detecting, we develop a virtual potential-field based coverage-enhancing scheme to improve the coverage performance. Furthermore, we apply the simulated annealing algorithm for objective optimization. The extensive simulations show the effectiveness of our proposed 3D sensing model and coverage enhancing method.

关键词： Sensor phenomena and characterization intelligent sensors Image sensors Layout Simulated annealing Sensor systems Communications Society intelligent networks Telecommunications Multimedia systems

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