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Vision-based behavior control of autonomous systems by fuzzy reasoning 3rd

引用

3rd International Workshop on Modelling and Integration of Sensor Based Intelligent Robot Systems, 1998

作者： Li, Wei Wahl, Friedrich M. Zhou, Jiangzhong Z. Wang, Hong He, Kezhong Z. Department of Computer Science and Technology Tsinghua University Beijing100084 China Institute for Robotics and Process Control Technical University of Braunschweig Hamburger Str. 267 BraunschweigD-38114 Germany Institute for Computer Peripherals Chinese Academic of Sciences Wuhan430050 China

ISBN: (纸本)3540669337

Vision-based motion control of an autonomous vehicle operating in real world requires fast image processing and robustness with respect to noisy sensor readings and with respect to varying illumination conditions. In order to improve vehicle navigation performance in out-door environments, this paper presents methods for recognizing landmarks based on fuzzy reasoning. Firstly, a fuzzy thresholding algorithm is proposed to segment roads and to extract white line marks on streets from images. Secondly, some special domain knowledge about edges on roads represented by fuzzy sets is integrated into the rule base of a fuzzy edge detector. Based on this, the fuzzy thresholding algorithm is adopted to recognize road edges. In addition, a method for path planning in sensor space is presented and a path following behavior based on a fuzzy rule base is defined to control vehicle motion. The proposed methods are applied to navigate the THMR-III autonomous vehicle in out-door environments. Some experimental driving maneuvers have been performed to prove their effectiveness and their robustness.…. © Springer-Verlag Berlin Heidelberg 1999.

关键词： Fuzzy inference

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Sensor-based controlling of the objects pose for multifinger grippers

Sensor-based controlling of the objects pose for multifinger...

引用

IEEE International Symposium on Intelligent control (ISIC)

作者： T. Fischer D. Rapela H. Woern Department of Computer Science Institute for Process Control and Robotics University of Karlsruhe Karlsruhe Germany

In the field of research and development of grippers in object-handling applications, many research results in improving grippers performances have been achieved, and many kinds of multifinger grippers have been developed. By using multifinger grippers, it is possible to grasp different objects of different shapes without changing grippers; and most importantly, it can manipulate the grasped object in the hand, under the condition that the object is controlled in real-time. Therefore, an object-pose controller with feedback from an object-pose sensor is presented in this paper.

关键词： Grippers Fingers Force control Sliding mode control Open loop systems control systems Robot sensing systems Shape control Feedback Orbital robotics

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Sensor-based obstacle modeling in configuration space for manipulator motion planning

Sensor-based obstacle modeling in configuration space for ma...

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International Workshop on Robot Motion and control (RoMoCo)

作者： Wei Li Zusbun Chen F.M. Wahl K.R. Kozlowski Department of Computer Science and Technology Tsinghua University Beijing China Institute for Robotics and Process Control Technical University of Braunschweig Brunswick Germany Chair of Control Robotics and Computer Science Poznań University of Technology Poznan Poland

Presents an approach to sensor-based obstacle modeling in a configuration space for manipulator motion planning in unknown environments. In order to achieve this objective, an efficient algorithm is used to fast map obstacles based on defined fundamental obstacles in the workspace and their images in the configuration space. A robotic manipulator is assumed to be equipped with distance sensors to detect obstacles in the local region. By computation of the critical points of an obstacle based on information acquired by the distance sensors, an obstacle model in the configuration space is constructed. By using this sensor-based configuration space modeling, robot motion planning in unknown environments can be performed in realistic time frames.

关键词： Manipulators Orbital robotics Motion planning Robot sensing systems Space technology Computational geometry Process planning Technology planning computer science Solid modeling

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A multithreaded Java microcontroller for thread-oriented real-time event-handling

A multithreaded Java microcontroller for thread-oriented rea...

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International Conference on Parallel Architecture and Compilation Techniques (PACT)

作者： U. Brinkschulte C. Krakowski J. Kreuzinger T. Ungerer Institute of Process Control Automation and Robotics University of Karlsruhe Karlsruhe Germany Institute of Computer Design and Fault Tolerance University of Karlsruhe Karlsruhe Germany

We propose a multithreaded Java microcontroller (called Komodo microcontroller) with a new hardware event handling mechanism that allows handling of simultaneous overlapping events with hard real-time requirements. Real-time Java threads are used as interrupt service threads (ISTs) instead of interrupt service routines (ISRs). Our proposed Komodo microcontroller supports multiple ISTs with zero-cycle context switching overhead. We evaluate the basic architectural attributes using real-time event parameters of an autonomous guided vehicle. When calculating the maximum vehicle speed without violating the real-time constraints, ISTs dominate ISRs by a speed increase of 28%.

关键词： Java Microcontrollers Switches Embedded system Yarn Application software Real time systems Hardware Multithreading Process control

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An efficient image processing algorithm for high-level skill acquisition

An efficient image processing algorithm for high-level skill...

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IEEE International Symposium on Assembly and Manufacturing (ISAM)

作者： J. Gonzalez-Linares N. Guil P. Perez M. Ehrenmann R. Dillmann Department of Computer Architecture University of Màlaga Malaga Spain Institute for Process Control and Robotics University of Karlsruhe Karlsruhe Germany

This paper describes the set-up of the image processing system installed at the IPR in Karlsruhe. It will serve for sensor device in the programming by demonstration field. As a first application example, it is used as source for images in the demonstration of a bag packaging task. A detection algorithm that finds positions of infusion bags is presented. It was developed at the Department of computer Architecture of the University of Malaga, and uses a straight line Hough transform after the application of a Canny filter. Then, the position of the rubber caps of the bags are located by a binarization technique to predicate the orientation of the bag. However, since the computing power is quite limited, the algorithms must have as low complexity as possible.

关键词： Image processing Robot sensing systems Robot programming Robotic assembly Cameras Intelligent robots Fingers computer architecture Intellectual property Application software

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Planning of regrasp operations

Planning of regrasp operations

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IEEE International Conference on robotics and Automation (ICRA)

作者： S.A. Stoeter S. Voss N.P. Papanikolopoulos H. Mosemann Artificial Intelligence Robotics and Vision Laboratory Department of Computer Science and Engineering University of Minnesota Minneapolis MN USA Institute for Robotics and Process Control Technical University of Braunschweig Germany

Robotic manipulators in contemporary work-cells are often incapable of solving even simple pick-and-place operations. More specifically, most systems require each object to be supplied in the same and pre-defined way. Introducing regrasping to the production cycle relaxes the constraints imposed on supply mechanisms. Regrasping describes the operation that must be performed whenever an object's pick-up grasp is incompatible with its put-down grasp. The paper presents a novel approach to solve the regrasp problem for robots equipped with parallel-jaw end-effecters. The proposed method first evaluates the object's possible grasps and placements. These are subsequently combined to form grasp-placement-grasp triples. A regrasp sequence leading from the pick-up to the put-down grasp is generated by searching through the resulting space of compatible grasp-placement-grasp triples. The algorithm takes kinematic and geometric constraints of both the manipulator and the objects into account. Computational concerns are addressed by subdividing the calculation into an off-line and a fast online phase.

关键词： Intelligent robots Robot vision systems Belts Path planning Artificial intelligence Laboratories computer science Process control Manipulators Production

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Smart reconfigurable miniature vision system for mobile robots

Smart reconfigurable miniature vision system for mobile robo...

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： A.B. Martinez E.X. Martin C. Torrens J.M. Ibanez Department of Automatic Control and Computer Engineering Universitat Poliltècnica de Catalunya Barcelona Spain Institute of Industrial Robotics Universitat Poliltècnica de Catalunya Barcelona Spain

The robot vision system presented consists of a PCB with a hardware-reconfigurable image processor, and a PCB with a standard commercial microprocessor. The microprocessor board interfaces with the host robot, configures the hardware of the image processor and runs the high-level image algorithms. Both boards occupy a volume of 10/spl times/10/spl times/3 cm/sup 3/ and consume less than 1A.

关键词： Machine vision Mobile robots Intelligent sensors Service robots Robot vision systems computer vision Microprocessors Hardware Robot sensing systems robotics and automation

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Joint controller for the object-pose controlling on multifinger grippers

Joint controller for the object-pose controlling on multifin...

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IEEE/ASME (AIM) International Conference on Advanced Intelligent Mechatronics

作者： T. Fischer D. Rapela H. Woern Department of Computer Science Institute for Process Control and Robotics University of Karlsruhe Karlsruhe Germany Karlsruher Institut fur Technologie - Campus Nord Eggenstein-Leopoldshafen Baden-WÃ¼rttemberg DE

A human hand as a very complex grasping tool can handle objects of different sizes and shapes. Many research works have been done to develop artificial robot hands with similar capabilities to a human hand, such a robot hand is also called a multifinger gripper. Most parts of this research are dedicated to control of multifinger grippers with emphasis on the finger tips or finger joints. By controlling a multifinger gripper, we enable the gripper to handle an object; in another words, controlling a multifinger gripper can be viewed in terms of controlling an object's pose and the forces between the object and its environment. Hence, an object-pose controller with feedback from an object pose sensor suits multifinger gripper control. Also due to the non-linear dynamic system behavior in the joints of most multifinger grippers, an effective, easily-adaptable joint controller is employed. The paper discusses the object pose controller with great detail in a new joint controller. Since the joint controller is based on fuzzy and neural-network algorithms, we do not use an exact analytical model for this case.

关键词： Grippers Force control Humans Robots Fingers Grasping Shape Nonlinear dynamical systems Nonlinear control systems control systems

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Dynamic process initial conditions in repetitive processes. controllability and stability analysis

Dynamic process initial conditions in repetitive processes. ...

引用

1999 Information, Decision and control, IDC 1999

作者： Galkowski, K. Rogers, E. Gramacki, A. Gramacki, J. Owens, D.H. Technical University of Zielona Gora Institute of Robotics and Software Engineering Zielona Gora Poland University of Southampton Image Speech and Intelligent Systems Research Group Department of Electronics and Computer Science SouthamptonSO17 lBJ United Kingdom University of Exeter Centre for Systems and Control Engineering School of Engineering ExeterEX4 4QF United Kingdom

ISBN: (纸本)0780352564

Repetitive, or multipass, processes are a class of 2D systems of both practical and algorithmic/theoretical interest whose dynamics cannot be analysed or controlled using standard (1D) systems theory. Recently it has been shown that the modelling of the boundary conditions, also known as the process initial conditions, is a crucial feature in the analysis and control of these processes. This paper presents some further results on the effects of so-called 'dynamic' process initial conditions on the controllability and stability properties of discrete linear repetitive processes. Previous work has shown that these dynamic process initial conditions alone can destroy the stability properties of these processes. Hence their effects must be 'adequately' accounted for the process modelling stage in order to ensure that subsequent analysis does not lead to incorrect results/conclusions. The main results developed in this paper can be summarised as follows. (i) Computationally efficient stability tests which can, in effect, be applied using standard, or 1D, linear systems tests. (ii) Characterisation of so-called pass controllability in the form of matrix rank based conditions. (iii) Conditions under which the dynamic process initial conditions can be selected to ensure stability and pass controllability. © 1999 IEEE.

关键词： controllability

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Dynamic process initial conditions in repetitive processes. controllability and stability analysis

Dynamic process initial conditions in repetitive processes. ...

引用

Information, Decision and control (IDC)

作者： K. Galkowski E. Rogers A. Gramacki J. Gramacki D.H. Owens Institute of Robotics and Software Engineering Technical University of Zielona Góra Zielona Gora Poland Department of Electronics and Computer Science Image Speech and Intelligent Systems Research Group University of Southampton Southampton UK Institute of Computer Engineering and Electronics Technical University of Zielona Góra Zielona Gora Poland School of Engineering Centre for Systems and Control Engineering University of Exeter Exeter UK

关键词： Stability controllability System testing control system analysis Algorithm design and analysis control systems Boundary conditions Process control Standards development Linear systems

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