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Recently, developing an autonomous navigating vehicle becomes more attention. It is equipped by multiple sensors, such as radar, laser, GPS, and camera. Among these sensors, utilization vision technique is the most adopted method for constructing such a system. It is because the camera provides a lot of information and is low-cost device rather than other sensors. Traffic signs, as one of the most...
In dense mobile wireless sensor networks, it is desirable to reduce traffic for data gathering as much as possible while satisfying an application requirement. In this paper, focusing on an application which monitors the time-variant shape of events, we discuss an approach to achieve an efficient monitoring with small traffic in dense mobile wireless sensor networks.
In this paper the authors consider the software implementation of three-dimensional visualization of the underwater environment using height maps via Windows Presentation Foundation. In addition, the problems of constructing a realistic 3D model of the surface topography have been described. In order to construct 3D model of the surface topography the authors have proposed the use of height maps and...
Applications in smart environments can make use of a user positioning service for various purposes such as activity recognition, context awareness and indoor navigation. We propose a novel solution to the user positioning problem based on inplane detection, which employs infrared light emitters and sensors placed horizontally on fixed positions along the circumference. The presented solution outputs...
Non-destructive techniques represent a very relevant tool in many engineering fields and play a relevant role in the case of preservation of cultural heritage and historical structures. This is particularly true in those countries exposed to seismic risk and other relevant natural hazards. Health conditions of masonry constructions often depend on the interaction between curved structures, such as...
This paper reports on a feasibility study of contactless hand biometrics using an RGB-Depth (RGB-D) camera such as the Kinect v2 prototype. The RGB, depth, and near-infrared (near-IR) spectra provide access to information such as palm print, hand shape, finger joint location, and vein patterns. Extraction of the hand is first done using depth data. The frames with the best palm position are selected,...
Partial discharges (PDs) phenomena in medium-voltage switchgears usually exist and are worth being paid more attention. In this paper, a kind of special switchgear cabinet and two kinds of typical PD sources is designed for the PD measurements. Based on the two typical PD models, measurement sensitivity and influence factors of above four kinds of detection methods are researched and analyzed. The...
Quasi-periodic signals can be modeled by their second order statistics as Gaussian process. This work presents a non-parametric method to model such signals. ECG, as a quasi-periodic signal, can also be modeled by such method which can help to extract the fetal ECG from the maternal ECG signal, using a single source abdominal channel. The prior information on the signal shape, and on the maternal...
Measuring the geometric structural traits of plants, especially the shape of leaves, plays an important role in the agricultural science. However, most existing techniques and systems have limited overall performance in accuracy, efficiency and descriptive ability, which is insufficient for the requirements in many real applications. In this study, a new kind of sensing device, the Kinect depth sensor...
A Terahertz planar periodic structure (engineered material), which shows several sharp Fano resonances, is introduce. These resonances are due to the small asymmetries of the structure which allow excitation of trapped modes. These sharp resonances can be used for biomedical sensing applications. HFSS simulation results are presented.
Our real-time continuous gesture recognition system addresses problems that have previously been neglected: handling both gestures that are characterized by distinct paths and gestures characterized by distinct hand poses; and determining how and when the system should respond to gestures. Our probabilistic recognition framework based on hidden Markov models (HMMs) unifies the recognition of the two...
Flocking with obstacle avoidance of multi-agents is a significant problem. In this paper, a flocking algorithm in the presence of arbitrary shape obstacles avoidance is provided both in 2D space and 3D space. When obstacles are sensed by α-agents, β-agents which denote obstacles will guide the α-agent driving away from obstacles in a fastest route. We present an approach to determine the position...
Human gait capture by vision plays an important role in the guidance for the rehabilitation of the lower limbs dysfunction patients. Unfortunately, it is not included in most of the present rehabilitation devices. This paper presents a novel real-time system for human gait capture by detecting the joints trajectory to obtain 3-D information of the joints motion by Kinect. Firstly, we put markers on...
We investigate the problem of optimizing the shape and location of sensors and actuators for evolution systems driven by distributed parameter systems or partial differential equations (PDE). We consider wave, Schrödinger and heat equations on an arbitrary domain Ω, in any space dimension, and with suitable boundary conditions (if there is a boundary) which can be of Dirichlet, Neumann, mixed or Robin...
We present a decentralized controller to keep a group of agents at equal spacing while moving around the perimeter of a loop defined by a constant distance from a convex polygon, motivated by a cooperative containment problem. Traveling at constant speed, the agents achieve and maintain their formation by using small steering adjustments to equalize the distance between themselves and their respective...
Random projection is a tried-and-true technique in signal processing for reducing sensing complexity while maintaining acceptable performance of downstream processing tasks. In this paper, we investigate random linear projection of point clouds followed by topo-logical data analysis for computing persistence diagrams and Betti numbers. In this first empirical study of its kind in the literature, we...
This paper proposes a frequency reconfigurable antenna system designed for cognitive radio applications. The antenna structure consists of a sensing antenna and a frequency reconfigurable antenna system. The sensing antenna scans the channel to discover frequency bands while the reconfigurable section is tuning to communicate within these bands. A reconfigurable antenna consists of five different...
In this paper, autonomous target localization is achieved on quadrotor helicopter, with the use of 2D laser rangefinder and fixed monocular camera. Color-featured target is located in 3D space without prior knowledge of its size or shape. Coordinate systems of camera and laser rangefinder are integrated to establish body-fixed reference coordinate system for both localization and flight control. Rotation...
This paper studies the performances of the popular gradient-based formation-control strategies for teams of autonomous agents when the agents' range measurements are coarse. Since the dynamics of the resulting closed-loop system are discontinuous, Filippov solutions to non-smooth dynamical systems are introduced. Similar to the existing stability results for triangular formations with precise range...
Among different remote sensing applications, change detection deserves specific consideration. The importance of this area is its applicability on damage assessment after natural disasters. Fortunately, recent sensors allow researchers to develop advanced change detection methods. Some of these benefit from panchromatic or multispectral remote sensing images, whereas others use 3D data besides the...
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