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Heterogeneous sensor fusion framework for autonomous mobile robot obstacle avoidance

Heterogeneous sensor fusion framework for autonomous mobile ...

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International Conference on intelligent Systems Design and Applications (ISDA)

作者： Ali Zia Tauseef Gulrez Tayyab Chaudhry Department of Computer Science Intelligent Machines & Robotics Research Group COMSATS Institute of Information Technology Lahore Pakistan

This paper addresses the problem of moving obstacle detection for autonomous mobile robots in unknown urban environments through the fusion of (vehicle-mounted) forward looking laser and vision sensors. In this approach we reparameterize the 2D gaussian distribution of the laser free-configuration eigenspaces by vision saliency gaussian kernel function. The approach uses bi-sensor paradigm to achieve greater effective mapping of the environment and improved accuracy in obstacle position estimation. Where the laser lower dimensional manifolds provide an eigenvector which corresponds to the free configuration space of the high order geometric representation of the environment and vision based edge detection followed by the saliency mapping provides the road detection and existance of dynamic obstacles on the road. We have shown that while the vectorial combination of eigenvectors at discrete time scan-frames of laser data manifest a trajectory, and once followed and fused with the vision sensor data, enables mobile robot to build an efficient and accurate online environment map free of obstacles. We demonstrated this process using real-time NAVLAB CMU (Autonomous Jeep's) data-set which is a good representation of autonomous mobile robot's navigation in an urban environment.

关键词： Robot sensing systems Laser modes Collision avoidance Mobile robots Gaussian distribution

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Bézier curve based dynamic obstacle avoidance and trajectory learning for autonomous mobile robots

Bézier curve based dynamic obstacle avoidance and trajector...

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2010 10th International Conference on intelligent Systems Design and Applications, ISDA'10

作者： Chaudhry, Tayyab Gulrez, Tauseef Zia, Ali Zaheer, Shyba Intelligent Machines and Robotics Research Group Department of Computer Science COMSATS Institute of Information Technology Lahore M.A. Jinnah Campus Defence Road Lahore Pakistan Department of Electrical Engineering College of Engineering and Applied Sciences Al Ghurair University Dubai United Arab Emirates

ISBN: (纸本)9781424481354

This paper addresses the problem of avoiding dynamic obstacles while following the learned trajectory through non-point based maps directly through laser data. The geometric representation of free configuration area changes while a moving obstacle enters into the safety region of autonomous mobile robot. We have applied the Bézier curve properties to the free configuration eigenspaces to satisfy the dynamic obstacle avoidance path constraints. The algorithm is designed to accurately represent the mobile robot's characteristics while avoiding obstacle such as minimum turning radius. Moreover, we also discuss the obstacle avoided path feasibility as a vectorial combination of free configuration eigen-vectors at discrete time scan-frames to manifest a trajectory, which once followed and mapped onto the two control signals of mobile robot will enable it to build an efficient and accurate online environment map. Preliminary results in Matlab have been shown to validate the idea, while the same has been implemented in Player/stage (robotics real-time software) to analyze the performance of the proposed system. © 2010 IEEE.

关键词： Trajectories

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The design of a single degree of freedom open-loop spatial mechanism that incorporates geared connections

The design of a single degree of freedom open-loop spatial m...

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2009 ASME International Mechanical Engineering Congress and Exposition, IMECE2009

作者： Bari, Joseph M. Crane III, Carl D. Dooner, David B. Mckinley, Javier Roldan University of Florida Center for Intelligent Machines and Robotics Gainesville FL United States University of Puerto Rico at Mayaguez Department of Mechanical Engineering Mayaguez Puerto Rico LaGuardia Community College C.U.N.Y. Mathematics Engineering and Computer Science United States

ISBN: (纸本)9780791843772

A means has been discovered to apply gear pairing to create a one degree of freedom open-loop spatial mechanism. A specially chosen geometry consisting of three pairs of parallel joint axes is constricted by five sets of gears, three of which are parallel planar, allows for a reconfigurable mechanism that is suited for repetitive tasks. Previous work has examined three-dimensional rigid body guidance in closed-loop geared mechanisms, but has not come to a solution for the open-loop case. Gear pairs are designed based upon a desired position and orientation path for the end effector. Numerical optimization is performed to obtain physically realizable gear profiles. Noncircular gear centrodes must be continuous and smooth as well as mono-directional, that is, gear ratios of a given pair may not switch signs. These constraints eliminate non-realizable or non-optimal gears in favor of simple, more easily produced profiles. Variable parameters include link lengths, joint offsets and twist angles. Numerical examples are presented. Copyright © 2010 by ASME.

关键词： Gears

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Visual guided robotic endodontic therapeutic system

Visual guided robotic endodontic therapeutic system

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International Conference on Information and Emerging Technologies, ICIET

作者： Tauseef Gulrez Abdul Karim Shahid Usman Sana Nadeem Ghafoor Chaudhary Intelligent Machines & Robotics Research Group Department of Computer Science Comsats Institute of Information Technology Lahore Pakistan Intelligent Machines & Robotics Research Group COMSATS Institute of Information Technology Lahore Pakistan Medical and Dental College The University of Lahore Pakistan

In this study, a visual-guided robotic endodontic therapeutic system was assessed, a specially designed visual servo controller model is also proposed in this system. Visual-guided robotic system will be mounted on the teeth within patient's mouth, while robot controller, and a root-canal image processor have shared control over its motion. With an on-line monitoring and positioning control, the multipurpose robotic system will perform automatic treatment procedures, including probing, drilling, filing, cleaning and filling. This paper will discuss the preliminary results on image processing based electrical torque control design of the proposed robotic system. The paper will also discuss the innovations involved from the traditional way endodontists treat root canal to science and technology based automation.

关键词： Irrigation Torque Robot kinematics Surgery Pixel Instruments

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Augmented reality approach for paper map visualization

Augmented reality approach for paper map visualization

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International Conference on Communication and Computational Intelligence (INCOCCI)

作者： C Adithya K Kowsik D Namrata V S Nageli Sangeeta Shrivastava S Rakshit Department of Information Science B. M. Sreenivasaiah College of Engineering Bangalore India Computer Vision Group Center for Artificial Intelligence and Robotics Bangalore India

Paper map visualization is good value proposition, even in the `everything is digital' world, because of the huge information density and ease of use at any remote or mobile location, especially in the military context. Completely doing away with the paper map brings in a discomfort factor for the military user. In this paper, we present a paper map data visualization solution that augments the information from the digital world onto a spread of a paper map. Augmented Reality techniques are used to enhance paper maps digitally resulting in a 3D visualization space with some interactions. The dynamic information of the terrain, placing virtual objects and interaction are features of the digital world that are superimposed onto a paper map. We have used ARToolkit marker tracking based approach and a see through Head Mounted Device for implementation. The digital elevation data in VRML format is split into smaller bits before rendering. The rendering is done after culling the relevant part of the terrain data and the same is popped up in stereo for enhanced visualization. The user can place virtual objects using markers. The distance between markers (user and reference) is calculated and is used for interactive features. The interaction options are load/select, slice/split and latch/freeze. We have achieved better performance by loading only the region of interest and not the complete terrain. The paper also illustrates the basic hardware set-up required for implementation.

关键词： Augmented reality Data visualization Cameras Three dimensional displays Rendering (computer graphics) Solid modeling Training

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Adaptive real-time video-tracking for arbitrary objects

Adaptive real-time video-tracking for arbitrary objects

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2010 IEEE/RSJ International Conference on intelligent Robots and Systems

作者： Dominik A. Klein Dirk Schulz Simone Frintrop Armin B. Cremers Intelligent Vision Systems Group Department of Computer Science III Rheinische Friedrich-Wilhelms-Universität Bonn Germany US Armed Systems Group Fraunhofer FKIE Wachtberg Germany

In this paper, we present a visual object tracker for mobile systems that is able to specialize to individual objects during tracking. The core of our method is a novel observation model and the way it is automatically adapted to a changing object and background appearance over time. The model is integrated into the well known Condensation algorithm (SIR filter) for statistical inference, and it consists of a boosted ensemble of simple threshold classifiers built upon center-surround Haar-like features, which the filter continuously updates based on the images perceived. We present optimizations and reasonable approximations to limit the computational costs. Thus, the final algorithms are capable of processing video input at real-time. To experimentally investigate the gain of adapting the observation model we compare two different approaches with a non-adapting version of our observation model: maintaining a single observation model for all particles, and maintaining individual observation models for each particle. In addition, experiments were conducted to compare system performances between the proposed algorithms and two other state of the art Condensation based tracking approaches.

关键词： Adaptation model Computational modeling Histograms Training Target tracking Real time systems Image color analysis

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QtImageLib: A cross-platform image processing library

QtImageLib: A cross-platform image processing library

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25th International Conference on computers and Their Applications 2010, CATA 2010

作者： Jacobs, Lucas Weiss, John M. Robotics and Intelligent Autonomous Systems South Dakota School of Mines and Technology 501 E. St. Joseph Street Rapid City SD 57701 United States Mathematics and Computer Science Department South Dakota School of Mines and Technology 501 E. St. Joseph Street Rapid City SD 57701 United States

ISBN: (纸本)9781617381102

We have developed a software library called QtImageLib that enables programmers to rapidly and easily create cross platform, high performance image processing applications. A simple image viewer, complete with dropdown menus, toolbar, scrollbars, cut-and-paste, pan and zoom, can be implemented in a few lines of C++ code. Image processing functionality, using built-in library routines or user software, can be added with a few more lines of code.

关键词： Image processing

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Bézier curve based dynamic obstacle avoidance and trajectory learning for autonomous mobile robots

Bézier curve based dynamic obstacle avoidance and trajector...

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International Conference on intelligent Systems Design and Applications (ISDA)

作者： Tayyab Chaudhry Tauseef Gulrez Ali Zia Shyba Zaheer Intelligent Machines & Robotics Research Group Department of Computer Science Comsats Institute of Information Technology Lahore Pakistan Department of Electrical Engineering College of Engineering and Applied Sciences Al Ghurair University Dubai UAE

关键词： Trajectory Vehicles Robot sensing systems Mobile robots Mathematical model Lasers

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GABOR-BASED TEXTURE CLASSIFICATION THROUGH EFFICIENT PROTOTYPE SELECTION VIA NORMALIZED CUT

GABOR-BASED TEXTURE CLASSIFICATION THROUGH EFFICIENT PROTOTY...

引用

16th IEEE International Conference on Image Processing

作者： Melendez, Jaime Puig, Domenec Angel Garcia, Miguel Intelligent Robotics and Computer Vision Group Department of Computer Science and Mathematics Rovira I Virgili University Spain Department of Informatics Engineering Autonomous University of Madrid Spain

ISBN: (纸本)9781424456536

This paper presents a new efficient technique for supervised pixel-based texture classification. The proposed scheme first performs a selection process that automatically determines a subset of prototypes that characterize each texture class based on the outcome of a multichannel Gabor wavelet filter bank. Then, every image pixel is classified into one of the given texture classes by using a K-NN classifier fed with the prototypes determined previously. The proposed technique is compared to previous texture classifiers by using both Brodatz and real outdoor textured images.

关键词： Pixel-based texture classification multichannel Gabor wavelet filters prototype selection

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On adapting the tensor voting framework to robust color image denoising

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13th International Conference on computer Analysis of Images and Patterns, CAIP 2009

作者： Moreno, Rodrigo Garcia, Miguel Angel Puig, Domenec Julià, Carme Intelligent Robotics and Computer Vision Group Department of Computer Science and Mathematics Rovira i Virgili University Av. Països Catalans 26 Tarragona 43007 Spain Department of Informatics Engineering Autonomous University of Madrid Cra. Colmenar Viejo Km 15 Madrid 28049 Spain

ISBN: (纸本)3642037666

This paper presents an adaptation of the tensor voting framework for color image denoising, while preserving edges. Tensors are used in order to encode the CIELAB color channels, the uniformity and the edginess of image pixels. A specific voting process is proposed in order to propagate color from a pixel to its neighbors by considering the distance between pixels, the perceptual color difference (by using an optimized version of CIEDE2000), a uniformity measurement and the likelihood of the pixels being impulse noise. The original colors are corrected with those encoded by the tensors obtained after the voting process. Peak to noise ratios and visual inspection show that the proposed methodology has a better performance than state-of-the-art techniques. © 2009 Springer Berlin Heidelberg.

关键词： Pixels

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