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International Conference on Pattern Recognition

作者： C. Fermuller Y. Aloimonos Comput. Vision Lab. Maryland Univ. College Park MD USA Computer Vision Laboratory Center for Automation Research Department of Computer Science and the Institute for Advanced Computer Studies University of Maryland College Park MD USA

ISBN: (纸本)0769507506

This paper studies the three major categories of flow estimation methods: gradient-based, energy-based, and correlation methods; it analyzes different ways of compounding 1D motion estimates (image gradients, spatio-temporal frequency triplets, local correlation estimates) into 2D velocity estimates, including linear and nonlinear methods. Correcting for the bias would require knowledge of the noise parameters. In many situations, however, these are difficult to estimate accurately, as they change with the dynamic imagery in unpredictable and complex ways. Thus, the bias really is a problem inherent to optical flow estimation. We argue that the bias is also integral to the human visual system. It is the cause of the illusory perception of motion in the Ouchi pattern and also explains various psychophysical studies of the perception of moving plaids. Finally, the implication of the analysis is that flow or correspondence can be estimated very accurately only when feedback is utilized.

关键词： Statistics Image motion analysis Frequency estimation Motion estimation Nonlinear optics Optical feedback Optical harmonic generation Optical noise Correlation Image analysis

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Parameter-independent geometric document layout analysis

Parameter-independent geometric document layout analysis

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International Conference on Pattern Recognition

作者： Dae-Seok Ryu Sun-Mee Kang Seong-Whan Lee Center for Artificial Vision Research Korea University Seoul South Korea Department of Computer Science Seokyeong University Seongbuk-Gu South Korea

ISBN: (纸本)0769507506

We propose a new method independent of parameters for segmenting the document images into maximal homogeneous regions and identifying them as texts, images, tables and lines. A pyramidal quadtree structure is constructed for multiscale analysis and top-down approach, and a periodicity measure is suggested to find a periodical attribute of text regions. To obtain robust page segmentation results, a confirmation procedure using texture analysis is applied to only ambiguous regions. Experimental results with the document database from the University of Washington show that the proposed method works better than the previous ones.

关键词： Text analysis Image segmentation Humans computer science Robustness Image texture analysis Databases Information technology Books Content based retrieval

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Design of a parallel-type gripper powered by pneumatic actuators

Design of a parallel-type gripper powered by pneumatic actua...

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IEEE International Workshop on Intelligent Robots and Systems (IROS)

作者： B.-J. Yi H.Y. Ra J.H. Lee Y.S. Hong J.S. Park S.-R. Oh I.H. Suh W.K. Kim School of Electrical Engineering and Computer Science Hanyang University South Korea Advanced Robotics Research Center KIST South Korea Intelligent System Control Research Center KIST South Korea Department of Control and Instrumentation Engineering Korea University South Korea

A new parallel gripping mechanism is proposed in this work. This device has a parallelogramic platform which can be flexibly folded. Therefore, this mechanism not only can be used to grasp an object having irregular shape or large volume, but also can be utilized as micro-positioning device after grasping the object. Forward position analysis and platform kinematics are investigated to deal with motion tracking and force control. Pneumatic rotator is employed for actuation and a compact sized, 4/3 way proportional pressure valve is also developed to deal with feedback-based dynamic control. The pressure valve also allows indirect force control by measuring the offset pressure occurring due to contact between the grasped object and the parallel platform. In experimental work, performances of the motion tracking and indirect force control are shown satisfactory.

关键词： Grippers Pneumatic actuators Force control Tracking Valves Shape Kinematics Motion analysis Pressure control Size control

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Face model adaptation with active tracking

Face model adaptation with active tracking

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IEEE International Conference on Image Processing

作者： Lijun Yin A. Basu Computer Vision and Robotics Research Laboratory Department of Computing Science University of Alberta Edmonton AB Canada

A system for face model adaptation combining active tracking is presented. Input from an active camera is used for MPEG4 model based coding. First, the background is compensated considering a moving camera (tilt or pan). Second, the talking face is segmented from the compensated background using fusion of frame differences. A morphological filter is then applied to make the system less sensitive to noise. Third, Hough transform and deformable template coupled with color information are exploited to detect the facial features, e.g., eyes, mouth. Fourth, a wireframe model is adapted to the extracted face by an extended dynamic mesh. The feasibility of the proposed system is demonstrated using several real active video sequences.

关键词： Adaptation model Face detection Cameras MPEG 4 Standard Filters Colored noise Facial features Eyes Mouth Data mining

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A novel method for discriminating between Oriental and European languages by fractal features 5

A novel method for discriminating between Oriental and Europ...

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5th International Conference on Document Analysis and Recognition, ICDAR 1999

作者： Xi, Dihua Lee, Seong-Whan Tang, Yuan Y. Center for Artificial Vision Research Korea University Seongbuk-ku Seoul136-701 Korea Republic of Department of Computer Science Hong Kong Baptist University Kowloon Tong Hong Kong

ISBN: (纸本)0769503187

A new method that uses a modified fractal dimension theory to segment a document image and to discriminate between Oriental and European languages is presented in this paper. Two types of techniques have been usually adopted in language discrimination: token matching and statistical analysis. A modified fractal feature is used to discriminate the distinct textual structure complexities of Oriental and European languages. Experiments show that this method is effective and reliable for processing the document image even if it is skewed or contains noise that can not be removed clearly. © 1999 IEEE.

关键词： Fractal dimension

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vision-based monitoring of weaving sections

Vision-based monitoring of weaving sections

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International Conference on Intelligent Transportation

作者： O. Masoud N.P. Papanikolopoulos E. Kwon Artificial Intelligence Robotics and Vision Laboratory Department of Computer Science University of Minnesota Minneapolis MN USA Center for Transportation Studies University of Minnesota Minneapolis MN USA

This paper presents algorithms for vision-based monitoring of weaving sections. These algorithms have been developed for the Minnesota department of Transportation in order to acquire data for several weaving sections in the Twin Cities Area. Unlike commercially available systems, the proposed algorithms can track and count vehicles as they change lanes. Furthermore, they provide the velocity and the direction of each vehicle in the weaving section. Experimental results from various weaving sections with various weather conditions are presented. The proposed methods are based on the establishment of correspondences among blobs and vehicles as the vehicles move through the weaving section. The blob tracking problem is formulated as a bipartite graph optimization problem.

关键词： Weaving Traffic control computerized monitoring Road vehicles Road transportation Vehicle detection Data mining Space vehicles Layout Artificial intelligence

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A robust method for unknown forms analysis

A robust method for unknown forms analysis

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International Conference on Document Analysis and Recognition

作者： Li Xingyuan D. Doermann Weon-Geun Oh Wen Gao Department of Computer Science and Engineering Harbin Institute of Technology Harbin China Center for Automation Research University of Maryland College Park MD USA Computer Vision Laboratory Systems Engineering Research Institute Taejon South Korea

ISBN: (纸本)0769503187

This paper proposes a strategy for analyzing unknown, filled forms. First, horizontal and vertical line segments are detected, extracted and filtered. A recursive splitting and merging algorithm eliminates overlapping segments, filters false segments, and groups the segments into lines. Based on the extracted lines, an algorithm for rectangle extraction is proposed. We define the constraints between rectangles and edges. In a process of scanning the horizontal and vertical lines, candidate edges are validated and rectangles are generated if its surrounding edges and their combination are all valid. The process is recursively applied. It can tolerate large breaks in form lines, ignore irrelevant segments and deal with embedded rectangles. Experiments on a collection of forms show that our approach works well on poor quality images.

关键词： Robustness Image segmentation Data engineering computer science Automation Educational institutions Machine vision Systems engineering and theory Merging Lapping

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A novel method for discriminating between Oriental and European languages by fractal features

A novel method for discriminating between Oriental and Europ...

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International Conference on Document Analysis and Recognition

作者： Dihua Xi Seong-Whan Lee Y.Y. Tang Center for Artificial Vision Research Korea University Seoul South Korea Department of Computer Science Hong Kong Baptist University Kowloon Hong Kong China

ISBN: (纸本)0769503187

关键词： Fractals

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A measure of linguistic specificity

A measure of linguistic specificity

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IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： C.D. Butler J. Yen Corps of Engineers Engineers Research and Development Center Vicksburg MS USA Center for Fuzzy Logic Robotics and Intelligent Systems Department of Computer Science Texas A and M University College Station TX USA

Understanding the level of uncertainty associated with a prediction is valuable in determining its utility in decision making. One measure of information is Yager's notion of specificity. Yager views specificity as the degree to which a possibility distribution points to a single element in the universe of discourse (U). Specificity in relation to U may complicate its utility in the optimization of fuzzy models in their linguistic space. An increase in granularity is useful to measure the amount of information contained in a possibility distribution in relation to fuzzy sets as opposed to U. This abstracted view of specificity motivates the need for a more generalized version of specificity, denoted linguistic specificity (Sp/sub 1/), where alternatives are measured in relation to the linguistic terms. Such a generalization is useful in support of automating decisions in a fuzzy domain. Results of the linguistic specificity measure are illustrated using an automobile fuel consumption example.

关键词： Entropy Decision making Probability distribution Fuzzy sets Intelligent robots research and development Fuzzy logic Orbital robotics robotics and automation Intelligent systems

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Robotic assistants for aircraft inspectors

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IEEE Instrumentation and Measurement Magazine 1998年第1期1卷 16-30页

作者： Siegel, Mel Gunatilake, Priyan Podnar, Gregg Intelligent Sensor Msrmt. C. Robotics Institute Carnegie Mellon University University of Colorado JILA University of Virginia SUNY Buffalo NY United States Extranuclear Laboratories ABB-Extrel Aircraft Diagnostics Corporation University of Alaska Fairbanks AK United States Elec. and Comp. Eng. Department Carnegie Mellon University CMU Vis. Lab. of the Robotics Institute CMU Mobile Robot Laboratory Engineering Design Research Center CMU Computer Science Department JiangXi University Robotics Institute Measurement and Control Laboratory

Various alternative aircraft inspection methods are first discussed and advantages of using robots are analysed. ANDI (Automated NonDestructive Inspector) and CIMP (Crown Inspection Mobile Platform) are then described. Remote 3D stereoscopic visual inspection is outlined and algorithms developed for crack detection and surface and subsurface corrosion detection are described. Future development trends are also outlined.

关键词： Robots Aircraft Aerospace electronics Instruments

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