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Laser measuring system for a flexible microrobot-based micromanipulation station

Laser measuring system for a flexible microrobot-based micro...

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IEEE International Workshop on Intelligent Robots and Systems (IROS)

作者： A. Buerkle S. Fatikow Computer Science Department Institute for Process Control and Robotics (IPR Universität Karlsruhe Karlsruhe Germany Computer Science Department Institute for Process Control and Robotics IPR Universität Karlsruhe Karlsruhe Germany

There is an increasing interest in performing assembly of microsystems by flexible microrobots. A microrobot-based microassembly desktop station has been developed at the University of Karlsruhe. In this paper, new implementation results of a computer vision based automatic control system of a mobile microrobot with an integrated flexible manipulator are discussed. The operations of the robot manipulator take place under a microscope equipped with a CCD-camera. A major drawback of this system is its lack of depth information. For this reason, the sensor system has been enhanced by a line laser, using laser triangulation. The set-up of the modified sensor system is described. The measuring principle is based on a method called sheet of light triangulation, a variation of standard triangulation. This approach is described in detail, and its advantages and limitations are discussed.

关键词： Manipulators Sensor systems Robotic assembly Microassembly computer vision Automatic control Mobile computing Robot sensing systems robotics and automation Microscopy

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Planning of rapid grasp operations in unstructured scenes

Planning of rapid grasp operations in unstructured scenes

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Proceedings. 2000 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS 2000) (Cat. No.00CH37113)

作者： M. Muller H. Worn Department of Computer Science Institute for Process Control and Robotics University of Karlsruhe Karlsruhe Germany

Grasping of unmodelled objects in unstructured scenes is a significant task in numerous robot applications. In order to reach short cycle times, grasp planning must make the best of the image information acquired all at once, which comprises more or less visual occlusions and thus unknown regions. For time reasons, it is not acceptable to inspect in further steps all unknown regions by means of local sensing before grasp planning. We present a grasp planning system, which determines explicitly the fractions of grasp operations in known and unknown regions. Using that crucial information, a planning system may not request a tool change, but prefer a grasping operation with the mounted gripper, which moves mostly in known and free regions. Then, only a small part has to be executed slowly using local sensing with, for examples, proximity or force torque sensors.

关键词： Layout Grippers Robot sensing systems Law Legal factors Force sensors Service robots Torque Shipbuilding industry Fingers

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A robust algorithm for segmenting deformable linear objects from video image sequences

A robust algorithm for segmenting deformable linear objects ...

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International Conference on Pattern Recognition

作者： F. Abegg D. Engel H. Worn Institute for Process Control and Robotics Computer Science Department Universität Karlsruhe Karlsruhe Germany

ISBN: (纸本)0769507506

A new algorithm for segmenting and tracking deformable (shape-changing) linear (thin and long with negligible diameter) objects in video images is presented. The core of algorithm is to detect the two boundary curves of a deformable linear object within adaptive tracking windows. The boundaries are found by analyzing the gray value gradients within the tracking windows. The algorithm allows moderate changes in the image brightness by introducing tolerance parameters to the algorithm. It also provides a robust tracking of the shape- and width-changing object by using a fuzzy estimation of the object's membership function at the tracked points. The result describes the shape of the object and is used to define features for shape change detection.

关键词： Robustness Image segmentation Image sequences Service robots Robot sensing systems Shape Image processing Robot vision systems Active contours Pixel

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Robust algorithms for recognizing shape changes of deformable linear objects in video image sequences

Robust algorithms for recognizing shape changes of deformabl...

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IEEE International Conference on Image Processing

作者： F. Abegg H. Worn Institute for Process Control and Robotics Computer Science Department Universität Karlsruhe Karlsruhe Germany

ISBN: (纸本)0780362977

A new algorithm for segmenting and tracking deformable (shape-changing) linear (thin and long with negligible diameter) objects in video images is presented. The core of the algorithm is to detect the two boundary curves of a deformable linear object within adaptive tracking windows. The boundaries are found by analyzing the gray value gradients within the tracking windows, The algorithm provides a robust tracking of the shape- and width-changing object by using a fuzzy estimation of the object's membership function at the tracked points. The result of the segmentation is a list of base describing the shape of the object. This list is used to define features for shape change detection. For the feature analysis, we propose an algorithm which works well for several classes of feature curves. Experiments on robotic applications using both algorithms show promising results.

关键词： Robustness Image recognition Shape Image sequences Change detection algorithms Image segmentation Object detection Algorithm design and analysis Service robots Robot sensing systems

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Distributed modular computer-integrated surgical robotic systems: Architecture for intelligent object distribution 3rd

Distributed modular computer-integrated surgical robotic sys...

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3rd International Conference on Medical Image Computing and computer-Assisted Intervention, MICCAI 2000

作者： Schorr, Oliver Hata, Nobuhiko Bzostek, Andrew Kumar, Rajesh Burghart, Catherina Taylor, Russel H. Kikinis, Ron Surgical Planning Laboratory Brigham and Women’s Hospital and Harvard Medical School BostonMA United States Institute for Process Control and Robotics University of Karlsruhe Germany Department of Computer Science Johns Hopkins University BaltimoreMD United States

ISBN: (纸本)3540411895

This paper presents intelligent object distribution architecture to maximize the performance and intelligence of a distributed surgical robotics system and its preliminary implementation in an MR-guided surgical robot system in an open-configuration MR! scanner. The method enables networked integration of a robot control server and multiple clients with minimum engineering overhead but maximum flexibility and performance. The clients in this study include an intraoperative imager, high-performance image processing computers), and surgical navigation host. The first contribution of the paper is to propose the use of object distribution by common object request broker architecture (CORBA), in which a robot control object on the robot control server can be remotely but transparently invoked from the clients regardless of their hardware, operating systems, or programming language. Second, we propose a technique to achieve additional flexibility by reporting the robot configuration information, i.e. geometry and kinematics of the robot, to the clients upon connection. Third, we ensure protection against an unauthorized entity by introducing a security control host that authorized the clients’ access to the robot server. In a prototype implementation of an MR-guided surgical robot system, the robot was controlled by surgical navigation software (the 3D Slicer) on a UNIX client by invoking the distributed control object on a robot control server on a PC. The method was evaluated in performance studies;and the result indicated 3.6 milliseconds for retrieving positions of the robot stages and 25.5 milliseconds to send a frame-based motion command, which are satisfactory for surgical robot control. In conclusion, the proposed method shows the potential usefulness of flexibly integrating the legacy software to a surgical robot system with minimum engineering overhead, thereby achieving highly complex and intelligent tasks in robot-assisted surgery. © Springer-Verlag Berlin Hei

关键词： Robotic surgery

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Real-time scheduling on multithreaded processors

Real-time scheduling on multithreaded processors

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IEEE International Conference on Embedded and Real-Time Computing Systems and Applications (RTCSA)

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

This paper investigates real-time scheduling algorithms on upcoming multithreaded processors. As evaluation testbed we introduce a multithreaded processor kernel which is specifically designed as core processor of a micro-controller or system-on-a-chip. Handling of external real-time events is performed through multithreading. Real-time threads are used as interrupt service threads (ISTs) instead of interrupt service routines (ISRs). Our proposed micro-controller supports multiple ISTs with zero-cycle context switching overhead. We investigate the behavior of fixed priority preemptive, earliest deadline first, least laxity first and guaranteed percentage scheduling with respect to multithreaded processors. Our finding is that the strategies GP and LLF result in a good blending of instructions of different threads thus enabling a multithreaded processor to utilize latencies best. Assuming a zero-cycle context switch LLF performs best, however implementation cost context, are prohibitive.

关键词： Processor scheduling Yarn Switches Scheduling algorithm System testing Kernel Process design System-on-a-chip Multithreading Delay

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Distributed modular computer-integrated surgical robotic systems: Implementation using modular software and networked systems 3rd

Distributed modular computer-integrated surgical robotic sys...

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3rd International Conference on Medical Image Computing and computer-Assisted Intervention, MICCAI 2000

作者： Bzostek, Andrew Kumar, Rajesh Hata, Nobuhiko Schorr, Oliver Kikinis, Ron Taylor, Russell H. Department of Computer Science Johns Hopkins University BaltimoreMD United States Surgical Planning Laboratory Brigham and Women’s Hospital and Harvard Medical School BostonMA United States Institute of Process Control and Robotics University of Karlsruhe Germany Engineering Research Center for Computer Integrated Surgical Systems and Technology Germany

ISBN: (纸本)3540411895

We seek to build CIS research systems within a flexible, open architecture. In this paper, we outline our solutions to the problems of system design, construction, and integration in this environment: building distributed, modular systems for sensing, control, and processing. Based on our experience building these systems, we utilize distributed network architectures, modular software components, and intelligent object distribution to maximize flexibility while complying with the particular needs and interfaces of specific components. While a work in progress, these approaches have been integrated into several systems in development and have demonstrated significant utility, based on construction time and system flexibility. This paper will discuss the first two aspects: modular software and basic network architectures, while intelligent object distribution is presented in a companion paper. Based on the applications we have targeted and technologies we have used, this paper introduces our architecture and its components. It then presents the system’s current state and finally, discusses plans for future improvements and extensions. © Springer-Verlag Berlin Heidelberg 2000.

关键词： Network architecture

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Generating polyhedral convex cones from contact graphs for the identification of assembly process states

Generating polyhedral convex cones from contact graphs for t...

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IEEE International Conference on robotics and Automation (ICRA)

作者： H. Mosemann T. Bierwirth F. Wahl S.A. Stoeter Institute for Robotics and Process Control Technical University of Braunschweig Brunswick Germany Artificial Intelligence Robotics and Vision Laboratory Department of Computer Science and Engineering University of Minnesota Minneapolis USA

A new approach to automatically generate polyhedral convex cones from contact graphs for identification of assembly process states is presented. The state of contact between subassemblies is changing as operation proceeds in manipulative tasks such as part-mating. Measured contact forces and the resulting torques provide information about the contact geometry which is used to guide the assembly operation. In this paper, we present a method to calculate contact graphs for polyhedral subassemblies. The nodes of the contact graph represent contact formations of the subassemblies and the arcs represent neighborhoods of contact formations. This information is used to generate polyhedral convex cones for each contact formation considering friction. These polyhedral convex cones describe static equilibrium for each contact formation and are used to identify the contact state by measuring forces and torques during a part-mating.

关键词： Robotic assembly Force measurement Torque measurement Assembly systems Intelligent robots Friction Robot sensing systems Robot vision systems robotics and automation Uncertainty

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Design of the TUAT/Karlsruhe humanoid hand

Design of the TUAT/Karlsruhe humanoid hand

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Proceedings. 2000 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS 2000) (Cat. No.00CH37113)

作者： N. Fukaya S. Toyama T. Asfour R. Dillmann Department of Mechanical System Engineering Tokyo University of Agriculture슠and슠Technology Japan Department of Computer Science Institute for Control and Robotics University of Karlsruhe Germany

The increasing demand for robotic applications in dynamic unstructured environments is motivating the need for dextrous end-effectors which can cope with the wide variety of tasks and objects encountered in these environments. The human hand is a very complex grasping tool that can handle objects of different sizes and shapes. Many research activities have been carried out to develop artificial robot hands with capabilities similar to the human hand. In this paper the mechanism and design of a new humanoid-type hand (called TUAT/Karlsruhe Humanoid Hand) with human-like manipulation abilities is discussed. The new hand is designed for the humanoid robot ARMAR which has to work autonomously or interactively in cooperation with humans and for an artificial lightweight arm for handicapped persons. The arm is developed as close as possible to the human arm and is driven by spherical ultrasonic motors. The ideal end-effector for such an artificial arm or a humanoid would be able to use the tools and objects that a person uses when working in the same environment. Therefore a new hand is designed for anatomical consistency with the human hand. This includes the number of fingers and the placement and motion of the thumb, the proportions of the link lengths and the shape of the palm. It can also perform most part of human grasping types. The TUAT/Karlsruhe Humanoid Hand possesses 20 DOF and is driven by one actuator which can be placed into or around the hand.

关键词： Humanoid robots Actuators Intelligent robots Grasping Cognitive robotics Agriculture Shape Human robot interaction Intelligent sensors Space technology

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Operation planning of robot supported surgical interventions

Operation planning of robot supported surgical interventions

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IEEE International Workshop on Intelligent Robots and Systems (IROS)

作者： J. Munchenberg J. Brief J. Raczkowsky H. Worn S. Hassfeld J. Muhling Institute for Process Control and Robotics Department of Computer Science University of Karlsruhe Karlsruhe Germany Clinic for Cranio-Maxillo-Facial-Surgery University of Heidelberg Heidelberg Germany

Presents a new operation planning system which enables a surgeon to plan and perform complex robot-supported surgical interventions. The system has been evaluated in the Clinic for Cranio-Maxillo-Facial Surgery at the University of Heidelberg. In contrast to commercial systems, our goal was that the system should consider the complete surgical intervention and not just a single procedure of it. A second goal was that the system should enable the management of complex operations, independent of which way the intervention is intra-operatively performed (without technical support, with passive navigation support or with active support by robots). Our system supports the surgeon during pre-operative planning as well as during the intra-operative execution phase. Therefore, we developed a model of the course of operation by which the management of surgical interventions is made possible. The focus of this paper is on this course model. First, we introduce instruction graphs and describe the structure of each activity, observing its attributes and their context. Additionally, various surgical scopes are presented which enable the surgeon to select one view among different ones in the individual operation procedures, in accordance with medical and technical knowledge as well as in accordance with different degrees of abstraction. Finally, we demonstrate the realisation of the introduced course model in our operation planning system and present first results in clinical practice.

关键词： Robots Surgery Surges Navigation Surgical instruments Head Process control computer science Process planning Costs

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