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An overview of RoboCup-2002 Fukuoka/Busan

An overview of RoboCup-2002 Fukuoka/Busan

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作者： Asada, Minoru Obst, Oliver Polani, Daniel Browning, Brett Bonarini, Andrea Fujita, Masahiro Christaller, Thomas Takahashi, Tomoichi Tadokoro, Satoshi Sklar, Elizabeth Kaminka, Gal A. Dept. of Adaptive Machine Systems Osaka University Osaka Japan University of Koblenz-Landau Artificial Intelligence Group Koblenz Germany University of Hertfordshire Hertfordshire United Kingdom Robotics Institute Carnegie Mellon University Pittsburgh PA United States Department of Electronics Politecnico di Milano Milano Italy GMD-Japan Research Laboratory Kitakyushu Japan Department of Computer Engineering Kobe University Kobe Japan Computer Science Department Ber Ilan University Ramat Gan Israel Computer Science Department Carnegie Mellon University Pittsburgh PA United States

This article reports on the Sixth Robot World Cup Competition and Conference (RoboCup-2002) Fukuoka/Busan, which took place from 19 to 25 June in Fukuoka, Japan. It was the largest RoboCup since 1997 and held the first humanoid league competition in the world. Further, the first ROBOTREX (robot trade and exhibitions) was held with about 50 companies, universities, and institutes represented. A total of 117,000 spectators witnessed this marvelous event, To the best of our knowledge, this was the largest robotic event in history.

关键词： Artificial intelligence

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Analyzing dividend events with neural network rule extraction

Analyzing dividend events with neural network rule extractio...

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International Joint Conference on Neural Networks (IJCNN)

作者： M. Dong Xu-Shen Zhou Machine Vision and Pattern Recognition Laboratory Department of Computer Science Wayne State University Detroit MI USA Department of Finance and Legal Studies College of Business Bloomsburg University Bloomsburg PA USA

Over the last two decades, artificial neural networks (ANN) have been applied to solve a variety of problems such as pattern classification and function approximation. In many applications, it is desirable to extract knowledge from trained neural networks for the users to gain a better understanding of the network's solution. In this paper, we apply REFANN (rule extraction from function approximating neural networks) in dividend events study. Based on our study of 1530 dividend initiations and 692 resumptions events from April 1965 to December 2000, we find that the positive relation between the short-term price reaction and the ratio of annualized dividend amount to stock price is primarily limited to 96 firms that have high dividend ratio and small firm size. The results suggest that the degree of short-term stock price underreaction to dividend events may not be as dramatic as previously believed. The results also show that the relations between the stock price response and firm size is also different across different types of firms. It is suggested that drawing the conclusions from the whole dividend events data may leave some important information unexamined. Our rule extraction method may shed some lights on further empirical research in corporate events studies because more information can be drawn from the data.

关键词： Neural networks Artificial neural networks Function approximation Data mining Biological neural networks machine vision Pattern recognition Laboratories computer science Finance

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Using intrinsic images for shadow handling

Using intrinsic images for shadow handling

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International Conference on Intelligent Transportation

作者： R.F.K. Martin O. Masoud N. Papanikolopoulos Artificial Intelligence Vision and Robotics Laboratory Department of Computer Science and Engineering University of Minnesota USA

The ability to detect shadows is a critical feature of any intelligent transportation system (ITS). The improper handling of shadows can be the cause of erroneous conclusions in traffic analysis. As vision-based ITS applications are becoming more popular, it is important to minimize the effects of shadows. Here, we present a novel method for shadow handling in a sequence of images. Following recent work motivated by studies of the statistics of natural images, we show that this new method is a reliable detector of shadows and can be easily implemented in real-time.

关键词： Intelligent transportation systems Vehicle detection Artificial intelligence Intelligent robots Vehicles Layout Magnetic analysis computerized monitoring computer vision Image edge detection

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vision-based monitoring of intersections

Vision-based monitoring of intersections

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International Conference on Intelligent Transportation

作者： H. Vceraraghavan O. Masoud N. Papanikolopoulos Artificial Intelligence University of Minnesota Vision and Robotics Laboratory Department of Computer Science and Engineering Artificial Intelligence University of Minnesota USA

The goal of tills project Is to develop a passive vision-based sensing system. The system will be capable of monitoring an intersection by observing the vehicle and pedestrian flow, and predicting situations that might give rise to accidents. A single camera looking at all intersection from an arbitrary position is used. However, for extended applications, multiple cameras will be needed. Some of the key elements are camera calibration, motion tracking, vehicle classification, and situations giving rise to collisions. In this paper, we focus on motion tracking. Motion segmentation is performed using an adaptive background model that models each pixel as a mixture of Gaussians. The method used is similar to the method of Stauffer et at. for motion segmentation. Tracking of objects is performed by computing the overlap between oriented bounding boxes. The oriented boxes are computed by vector quantization of the blobs in the scene. The principal angles computed during vector quantization along with other cues of the object are used for classification of detected entities into vehicles and pedestrians.

关键词： Monitoring Cameras Tracking Motion segmentation computer vision Vector quantization Vehicle detection Accidents Calibration Gaussian processes

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Retrieving faces using adaptive subspace self-organising map

Retrieving faces using adaptive subspace self-organising map

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International Symposium on Intelligent Multimedia, Video and Speech Processing

作者： Zhi-Qiang Liu School of Creative Media City University of Hong Kong Hong Kong China Computer Vision and Machine Intelligence Lab Department of Computer Science and Software Engineerin University of Melbourne VIC Australia

We present the adaptive manifold self-organising map (AMSOM) for a face retrieval system. Our experimental results show that it has an excellent potential for face retrieval applications. As compared to the more tradi... 详细信息

ISBN: (纸本)9628576623

关键词： Face recognition Neurons Face detection Vectors Gabor filters Lattices computer vision Feature extraction Data mining Detectors

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Complementary linear biases in spatial derivative estimation for improving geometry-driven diffusion processes

Complementary linear biases in spatial derivative estimation...

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15th International Conference on Pattern Recognition, ICPR 2000

作者： Toczyski, William D. Papanikolopoulos, Nikolaos P. Artificial Intelligence Robotics and Vision Laboratory Department of Computer Science and Engineering University of Minnesota 4-192 EE/CS Bldg. 200 Union Street SE MinneapolisMN55455 United States

ISBN: (纸本)0769507506

This paper introduces a broadly applicable technique for visibly improving the digitized, grey-level outputs produced by a host of iterative geometric diffusion methods. By replacing standard, central-difference estimates of discrete spatial gradients with alternating image derivative estimates that are offset by known, complementary biases, errors accumulated during iteration are reduced and the quality of geometric diffusions is improved. This unexpected synergy occurs at no added computational cost over central difference methods. Very simple to implement, the innovation is introduced at the level of spatial derivatives;hence, for a given process, any derived higher level mathematical properties - for example, group invariance or scale-space properties - can be preserved. © 2000 IEEE.

关键词： Iterative methods

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Counting bicycles using computer vision

Counting bicycles using computer vision

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International Conference on Intelligent Transportation

作者： S. Rogers N.P. Papanikolopoulos Artificial Intelligence Robotics and Vision Laboratory Department of Computer Science and Engineering University of Minnesota Minneapolis MN USA

This paper describes a system for monitoring bicycle activity in sequences of gray scale images acquired by a stationary camera. The system is suitable for use in applications that aim to increase the efficiency and safety of existing traffic systems. One such application is to determine usage and congestion of bicycle path. The output of the system is a count of the number of bicycles detected in the image sequence. The system is model-based in the sense that it uses a simple model of two circular objects separated by a relatively known distance. Our system uses four levels of abstraction: raw images, blobs, edge images, and the bicycle model. The system was implemented on a dual Pentium computer equipped with a Matrox imaging board and achieved a peak performance of 8 frames per second. Experimental results based on outdoor scenes have shown promising results for a variety of weather conditions.

关键词： Bicycles computer vision Application software computerized monitoring Cameras Safety Traffic control Image sequences Image edge detection Layout

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Complementary linear biases in spatial derivative estimation for improving geometry-driven diffusion processes

Complementary linear biases in spatial derivative estimation...

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International Conference on Pattern Recognition

作者： W.D. Toczyski N.P. Papnikolopoulos Artificial Intelligence Robotics vision laboratory Department of computer science and Engineering University of Minnesota Minneapolis MN USA University of Minnesota Minneapolis MN US

ISBN: (纸本)0769507506

This paper introduces a broadly applicable technique for visibly improving the digitized, grey-level outputs produced by a host of iterative geometric diffusion methods. By replacing standard, central-difference estimates of discrete spatial gradients with alternating image derivative estimates that are offset by known, complementary biases, errors accumulated during iteration are reduced and the quality of geometric diffusions is improved. This unexpected synergy occurs at no added computational cost over central difference methods. Very simple to implement, the innovation is introduced at the level of spatial derivatives; hence, for a given process, any derived higher level mathematical properties-for example, group invariance or scale-space properties-can be preserved.

关键词： Anisotropic magnetoresistance Equations Geometry Image motion analysis Optical filters Pixel Diffusion processes Artificial intelligence Intelligent robots Robot vision systems

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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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A framework for object-based image retrieval at the semantic level 3rd

A framework for object-based image retrieval at the semantic...

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3rd International Conference on Visual Information Systems, VISUAL 1999

作者： Jia, Linhui Kitchen, Leslie Computer Vision and Machine Intelligence Lab Department of Computer Science and Software Engineering Melbourne University ParkvilleVIC3052 Australia

This paper proposes a framework with essential components and processes for object-based image retrieval based on semantically meaningful classes of objects in images. An instantiation of the framework is presented to... 详细信息

ISBN: (纸本)3540660798

关键词： Semantics

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