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Intelligent motion control system for autonomous vehicles operating in a factory floor

Intelligent motion control system for autonomous vehicles op...

引用

1990 IEEE International Workshop on Intelligent Motion Control, IMC 1990

作者： Luo, Ren C. Pan, T.J. Aras, C.M. Robotics and Intelligent Systems Laboratory Department of Electrical and Computer Engineering North Carolina State University University RaleighNC27695 United States

To improve the performance of autonomous vehicles operating in a factory environment, it is important to develop an intelligent planning system to avoic. vehicle collisions as well as to design a good path network which can minimize the congestion problem. Given a path network, the collision problem can be eliminated by velocity planning for vehicles. To achieve this, we first represent each vehicle as an intersection of time varying half-planes. Then, we use traversability vectors method to predict vehicle collisions along their paths. Once a collision is predicted, time constraints on lower-priority vehicles are registered on a constraint map which shows time instances when the path is obstructed. Velocity planning is then accomplished ty a search on the map. To solve the congestion problem, we must reduce the average waiting time of vehicles. We use a queueing network model to evaluate the average waiting time for different path network configurations. As a result. the network that yields the best performance is selected. © 1991 IEEE.

关键词： Autonomous vehicles

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Surface reconstruction based on descripions of cross-sectional contours

Surface reconstruction based on descripions of cross-section...

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Sensing and Reconstruction of Three-Dimensional Objects and Scenes 1990

作者： Kim, Yonghoon Luo, Ren C. Robotics and Intelligent Systems Laboratory Department of Electrical and Computer Engineering North Carolina State University RaleighNC27695-7911 United States

Surface reconstruction from cross-sectional contours has become increasingly important in medical image applications. In this paper, a method of reconstructing the surface of an object based on the descriptions of cross-sectional contours has been developed. Each cross-sectional contour is first partitioned into convex/concave segments based on the relative locations of points on the contour. Each segment of the contour is then described by a parametric cubic polynomial, and the boundary is recovered based on the description. A matching technique incorporating possible deformations between adjacent cross-sections is used to obtain the correspondence between adjacent cross-sectional contours. Once the correspondence is established, the surface between correspondent segments of adjacent crosssectional contours is reconstructed by a traditional triangulation technique. As the reconstruction is based on the shape of the cross-sections, the reconstructed surfaces are more close to that of the original object. © 1990 SPIE. All rights reserved.

关键词： Surface reconstruction

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An intelligent path planning system for robot navigation in an unknown environment

An intelligent path planning system for robot navigation in ...

引用

Mobile Robots IV 1989

作者： Luo, Ren C. Pan, Tai-Jee Robotics and Intelligent Systems Laboratory Department of Electrical and Computer Engineering North Carolina State University RaleighNC27695-7911 United States

In this paper, a novel approach to solve the mobile robot path planning problem in an unknown environment is presented. Inherently, the obstacle information from robot perception is contaminated with uncertainties, and thus, the acquired obstacle knowledge for path planning needs to be updated dynamically. Therefore, the development of an adaptive path planning scheme capable of determining a desired path with uncertain, and incomplete obstacle knowledge is necessary. We use the concept of traversability vectors to analyze the spatial-relations between the robot and obstacles in the task environment. Then, these analyzed relations are used to determine the obstacles that must be bypassed by the robot, and the ways to bypass them. Dynamically changing obstacle knowledge can be accommodated by replanning the path at the time when a change is reported. The proposed scheme can work very efficiently since because of the elimination of an exhausted search process that is often required in previous approaches. We implement a computer program to simulated the proposed planning scheme. A graphical representation for robot motions guided by the planned paths is illustrated to show the feature of the presented work. © 1990 SPIE. All rights reserved.

关键词： Motion planning

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3D object recognition using a mobile laser range finder

3D object recognition using a mobile laser range finder

引用

1990 IEEE International Workshop on Intelligent Robots and systems, IROS 1990

作者： Luo, Ren C. Scherp, Ralph S. Robotics and Intelligent Systems Laboratory Department of Electrical and Computer Engineering North Carolina State University RaleighNC27695-7911 United States

The objective of this paper is to present a 3D object recognition system with emphasis on an optimum placement strategy for a mobile 3D range sensor. The theoretical aspects leading to the development of the 3D sensor placement paradigm are presented and described. In this paper we use a triangulation type laser range finder in which a CCD based imaging device is utilized to view a plane of laser light bounced from a sweeping mirror. The sensor characteristics are described and modeled. A set of criteria for use in constraining the. possible sensor site location for future scans is presented. These constraint conditions are essential to drive the actual sensor placement algorithm for 3D object recognition. © 1990 Institute of electrical and Electronics Engineers Inc.. All rights reserved.

关键词： Laser mirrors

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T-buffer: Fast visualization of relativistic effects in spacetime 90

T-buffer: Fast visualization of relativistic effects in spac...

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1990 Symposium on Interactive 3D Graphics, I3D 1990

作者： Hsiung, Ping-Kang Thibadeau, Robert H. Wu, Michael Carnegie Mellon University PittsburghPA15213 United States Department of Electrical and Computer Engineering Carnegie Mellon University United States Imaging Systems Laboratory Robotics Institute Carnegie Mellon University United States

ISBN: (纸本)0897913515

Wc have developed an innovative ray-tracing simulation algorithm to describe Welativistic Effects in SpaceTime ("REST"). Our algorithm, called REST-frame, models light rays that have assumed infinite speed in conventional ray-tracing to have a finite speed in spacetime, and uses the non-Newtonian Lorentz Transformation to relate measurements of a single event in different inertial coordinate systems {inertial frames). Our earlier work [5][6][7] explored the power of REST-frame as an experimentation tool to study the rich visual properties in natural world modeled by Special Relativity. Non-intuitive images of the anisotropic deformation ("warping") of space, the intensity concentration/spreading of light sources in spacetime, and the relativistic Doppler shift were visualized from our simulations. REST-frame simulations arc computationally expensive. Several hours of CPU time may be needed to generate one intricate image on a relatively powerful DECStation 3100. This high simulation cost of REST-frame precludes its application in interactive, real-time graphics environments. In this paper, we report a scanline based REST-frame rendering method that provides a faster alternative to the original ray-tracing based REST-frame implementation. This new method operates in the spirit of the classical Z-buffer in computer graphics[2] and the inter-inortial frames point-mapping method investigated in physics in the early 1960's[14][12], and determines the visibility of points in spacetime by their spatial and temporal visibility. Specifically, all spacetime event points that arc potentially visible from the viewpoint at the imaging time are geometrically projected in three dimensional (3D) space to the image plane pixel buffer. Multiple points with a same pixel affiliation arc sorted by their time distance © 1990 ACM.

关键词： Ray tracing

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Tracking in a complex visual environment 1st

Tracking in a complex visual environment

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1st European Conference on computer Vision, ECCV 1990

作者： Aloimonos, John Yiannis Tsakiris, Dimitris P. Computer Vision Laboratory Center for Automation Research and Institute for Advanced Computer Studies and Computer Science Department University of Maryland College ParkMD20742-3411 United States Electrical Engineering Department and Systems Research Center University of Maryland College ParkMD20742-3411 United States

ISBN: (纸本)9783540525226

We examine the tracking of 3-dimensional targets moving in a complex (e.g. highly textured) visual environment, which makes the application of methods relying on static segmentation and feature correspondence very problematic, even under specific assumptions about the trajectory of the target. From the system kinematics and optical flow formalism we derive a general criterion, the Tracking Constraint, which specifies the optimal camera reorientation as the one that minimizes the optical flow in the center of the camera in the sense of an appropriate metric. A correspondence-free scheme is devised which employs dynamic segmentation and linear features of the image in order to capture global information about the scene and bypass numerical differentiation of the image intensity. © Springer-Verlag Berlin Heidelberg 1990.

关键词： Optical flows

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Survey of the Robust Control of Robots

Survey of the Robust Control of Robots

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American Control Conference (ACC)

作者： C. Abdallah P. Dorato M. Jamshidi CAD Laboratory for Systems and Robotics Electrical and Computer Engineering Department University of New Mexico Albuquerque NM USA

In this survey, we discuss current approaches to the robust control of the motion of robots and summarize the available literature on the subject. The three major designs discussed are the "Linear-Multivariable" Approach, the "Passivity" approach and the "Variable-Structure" approach. The survey is limited to rigid robots and nonadaptive controllers.

关键词： Robust control Robot kinematics Control systems Tellurium Equations Robot control Adaptive control Symmetric matrices Gravity Lagrangian functions

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A tutorial on multisensor integration and fusion

A tutorial on multisensor integration and fusion

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Annual Conference of Industrial Electronics Society

作者： R.C. Luo M.G. Kay Robotics and Intelligent Systems Laboratory Department of Electrical and Computer Engineering North Carolina State University Raleigh NC USA

A tutorial introduction to the subject of multisensor integration and fusion is presented. The role of multisensor integration and fusion in the operation of intelligent systems is defined in terms of the unique type of information multiple sensors can provide. Multisensor integration is discussed in terms of basic integration functions and multisensor fusion in terms of the different levels at which fusion can take place. Numerical examples are given to illustrate a variety of different fusion methods. Speculations concerning possible research future directions and a guide to survey and review papers in the area of multisensor integration and fusion are presented.< >

关键词： Tutorial Sensor systems Intelligent sensors Intelligent robots Intelligent systems Sensor fusion Machine intelligence Control systems Aircraft navigation Laboratories

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Intelligent Motion Control System for Autonomous Vehicles Operating in a Factory Floor

Intelligent Motion Control System for Autonomous Vehicles Op...

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Proceedings of the IEEE International Workshop on Intelligent Motion Control

作者： Ren C. Luo T.-J. Pan C.M. Aras Robotics and Intelligent Systems Laboratory Department of Electrical and Computer Engineering North Carolina State University Raleigh NC USA

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3D object recognition using a mobile laser range finder

3D object recognition using a mobile laser range finder

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EEE International Workshop on Intelligent Robots and systems, Towards a New Frontier of Applications

作者： R.C. Luo R.S. Scherp Robotics and Intelligent Systems Laboratory Department of Electrical and Computer Engineering North Carolina State University Raleigh NC USA

Presents a 3D object recognition system with emphasis on an optimum placement strategy for a mobile 3D range sensor. The theoretical aspects leading to the development of the 3D sensor placement paradigm are presented and described. The authors use a triangulation type laser of range finder in which a CCD based imaging device is utilized to view a plane of laser light bounced from a sweeping mirror. The sensor characteristics are described and modeled. A set of criteria for use in constraining the possible sensor site location for future scans is presented. These constraint conditions are essential to drive the actual sensor placement algorithm for 3D object recognition.< >

关键词： Object recognition Intelligent sensors Sensor phenomena and characterization Robot sensing systems Intelligent robots Robot vision systems Cameras Mobile robots Laser modes Data mining

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