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A method to restore Chinese warped document images based on binding characters and building curved lines

A method to restore Chinese warped document images based on ...

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IEEE International Conference on systems, Man and Cybernetics

作者： Hong Liu Ye Lu Key Laboratory of Machine Perception and Intelligence Key Laboratory of Integrated Micro-System Shenzhen Graduate School Peking University China

With rapid development of information technology, more and more document images are made by scanners. But new problem comes out that many of document images from thick books are warped. It is quite inconvenient for further process on computer. This paper introduces an integrative algorithm on restoring Chinese document images, which is a new filed and few researchers have worked on this subject yet. The complicated structure of Chinese ¿block words¿ makes the problem more difficult. To solve this, a restoring method which is based on binding characters iteratively and building curved lines using parallel lines method is introduced. In the phase of fitting, SVR is adopted instead of other parameter methods. An idea of collaboration is also recommended to guarantee the quality of the final results. Correction rate of 94% for experiment of 300 document images proves this method works out very well.

关键词： Image restoration Laboratories Books Intelligent structures machine intelligence Buildings Cameras Surface fitting Cybernetics USA Councils

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Restoring Chinese documents images based on text boundary lines

Restoring Chinese documents images based on text boundary li...

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IEEE International Conference on systems, Man and Cybernetics

作者： Hong Liu Runwei Ding Key Laboratory of Machine Perception and Intelligence Key Laboratory of Integrated Micro-system Shenzhen Graduate School Shenzhen Graduate School Peking University China Key Laboratory of Integrated Microsystem Key Laboratory of Machine Perception and Intelligence Shenzhen Graduate School Peking University China

Distortion always appears in document images while scanning thick bound volumes. There are two kinds of distortion for the scanned grayscale images, shadow appears at the volumes' spine area, and warping of the words occurs in the shadow. In this paper, a novel text boundary lines based method for efficient restoration of warped scanning Chinese document images is presented. We first detect on which side of an image the shadow lays by row grayscale analysis method. Then the shadow is removed by a modified Niblack's algorithm. In order to detect the warped feature, a text boundary lines' detection method is proposed. Finally, an adjustment method based on the text boundary lines is carried to restore the warped words. Experiments on 400 various scanning Chinese document images are implemented. The improvement on average character recall is 11.92% to 14.89%. Experiments show that the proposed restoration method is efficient for Chinese documents with both text and non-text regions.

关键词： Image restoration Surface reconstruction Laboratories Image reconstruction Image processing Books machine intelligence Gray-scale Computer vision Shape

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A Slope K Method for Image Based Localization

A Slope K Method for Image Based Localization

引用

2009 IEEE International Conference on Robotics and Biomimetics(2009 IEEE 机器人与仿生技术国际会议 ROBIO 2009)

作者： Hong Liu Haitao Yu Yuexian Zou Zhenhua Huo Key Laboratory of Machine Perception and Intelligence and the Key Laboratory of Integrated Micro-sys Key Laboratory of Integrated Micro-system Shenzhen Graduate SchoolPeking UniversityShenzhen 518055

ISBN: (纸本)9781424447749

In this paper, we present a SIFT based Slope K method which is faster and more robust than the classical SIFT in landmark based localization. First, the slope k value can be used to erase mismatched feature points (outliers) of the two compared images. Second, the y position is determined by the slope k value. Therefore, the Slope K method is able to localizes about twice as more accurate as the classical SIFT. Another advantage of the proposed method is that the number of database images needed to be matched is significantly reduced, compared to the classical SIFT. Therefore the time cost is approximate 4 times less than that of the classical SIFT.

关键词： Testing Image databases Robustness Spatial databases Mobile robots Robot kinematics Information filtering Information filters Lighting Biomimetics

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Hierarchical Roadmap Based Rapid Path Planning for High-DOF Mobile Manipulators in Complex Environments

Hierarchical Roadmap Based Rapid Path Planning for High-DOF ...

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2009 IEEE International Conference on Robotics and Biomimetics(2009 IEEE 机器人与仿生技术国际会议 ROBIO 2009)

作者： Hong Liu He Wen Yan Li Jingyan Xia Tianguang Chu Key Laboratory of Machine Perception and Intelligence and the Key Laboratory of Integrated Micro-sys Key Laboratory of Integrated Microsystem Shenzhen Graduate SchoolPeking UniversityShenzhen 518055 Intelligent Control Laboratory Center for Systems and ControlDepartment of Industrial Engineering a

ISBN: (纸本)9781424447749;9781424447756

The Probabilistic Roadmap method (PRM) has been widely used in the field of robot path planning and based on it, a great number of variants have been developed addressing for different purposes, e.g. the Lazy PRM method, the Dynamic Roadmap (DRM) method, and the Dynamic Bridge Builder method (DBB). In this paper, PRM is extended as well-a hierarchical roadmap based rapid path planner is presented, which combines DRM with DBB to achieve good planning performance in environments including moveable obstacles. Through observation, we find that how to determine precise location of a robot's end-effector is quite important for nearly all practical planning tasks. Moreover, the workspace that can be swept by its end-effector determines scope of action of a robot. In consideration of the safety factor, the velocity of planning should be limited. Accordingly, its scope of action must be limited during a certain time interval, as well. In this paper, a hierarchy sampling strategy oriented towards the end-effector position is employed. Initially only a fundamental global roadmap is constructed and visible. Then the scope of a manipulator, called manipulator space in this paper, is computed. Moveable obstacles lying inside the manipulation space are used to update the global roadmap and activate other two layers of nodes with Dynamic Bridge Builder. The approach has been implemented and tested in simulation, and results show that it meets the real-time demand well.

关键词： Path planning NIH Roadmap Initiative tag Road maps Robot TWO-LAYER power bridge Time intervals end effectors Factor of safety Environments Mobile manipulator Construction Workers

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Robust controller Design for Networked control systems with Nonlinear Uncertainties

Robust Controller Design for Networked Control Systems with ...

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2009 American control Conference (ACC 2009)

作者： Junyan Yu Long Wang Mei Yu Jie Chen Yingmin Jia Intelligent Control Laboratory Center for Systems and Control College of Engineering and Key Laboratory of Machine Perception (Ministry of Education) Peking University Beijing 100871 P.R.China Department of Automation North China Electric Power University Zhuxinzhuang Dewai Beijing 102206 P.R.China Beijing Institute of Technology Key Laboratory of Complex System Intelligent Control and Decision Ministry of Education Beijing 100081 P.R.China Seventh Research Division Beihang University Beijing 100083 P.R. China

ISBN: (纸本)9781424445233

We address robust stabilization problem for networked control systems with nonlinear uncertainties and packet losses by modelling such systems as a class of uncertain switched systems. Based on theories on switched Lyapunov functions, we derive the robustly stabilizing conditions for state feedback stabilization and design packet-loss dependent controllers by solving some matrix inequalities. A numerical example and some simulations are worked out to demonstrate the effectiveness of the proposed design method.

关键词： Networked control systems robust controller design Packet loss control systems design approach Switched systems controller design State feedback Uncertainty nonlinearity

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Investigation and analysis of the influence of magnetic wedges on high voltage motors performance

Investigation and analysis of the influence of magnetic wedg...

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2008 IEEE Vehicle Power and Propulsion Conference, VPPC 2008

作者： Wang, Shuping Zhao, Zhengming Yuan, Liqiang Wang, Buyao Department of Electrical Engineering State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China Anhui Electric Power Research Institute Corporation Company Ltd. Department of XiangTan Electric Machine Xiangtan China

ISBN: (纸本)9781424418497

To weaken the pulsation of the harmonic magnetic field and improve the wave of the air-gap magnetic field in high voltage motors because of their open slots, magnetic slot wedge should be imbedded into the slot opening. In the paper, through analyzing the air-gap magnetic field distribution of large-scale motors affected by embedding magnetic slot wedges in open slots, the influence of magnetic slot wedge on the motor parameters and performance is discussed in theory. The finite element analysis (FEA) and the experiment results were given, which not only proves the validity of the analysis in the paper, also through the simulation results the proper parameters of magnetic slot wedges for best performance of motors were concluded, which provides a theoretical reference for the manufacturers when choosing or processing magnetic slot wedges. © 2008 IEEE.

关键词： Finite element method

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Modular design of adaptive controller for strict-feedback stochastic nonlinear systems with uncertain Wiener noise

Modular design of adaptive controller for strict-feedback st...

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International Conference on control, Automation, Robotics and Vision (ICARCV)

作者： Jun Wang Tao Cai Yu Kang Key Laboratory of Machine Vision and Intelligence Control Technology Hefei University Hefei China Department of Automation University of Science and Technology Hefei China

In this paper, a modular approach is proposed for a class of strict-feedback stochastic nonlinear systems with uncertain Wiener noises and constant unknown parameters. Both the adaptive Backstepping procedure and input-to-state stable(ISS) controller of global stabilization in probability are designed to guarantee that the system states are bounded and has adaptive stabilization while the covariance of Wiener noises is uncertain. According to Swapping technique, we develop two filters and convert dynamic parametric models into static ones to which the gradient update law is designed.

关键词： Programmable control Adaptive control Nonlinear control systems control systems Stochastic systems Stochastic resonance Nonlinear systems Backstepping Filters Parametric statistics

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Modular design of adaptive tracking for a class of stochastic nonlinear systems

Modular design of adaptive tracking for a class of stochasti...

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International Conference on control, Automation, Robotics and Vision (ICARCV)

In this paper, a modular design approach of adaptive tracking is proposed for parameter-strict-feedback stochastic nonlinear systems with standard Wiener noises and constant unknown parameters. Both the adaptive backstepping procedure and input-to-state stable (ISS) controller of global stabilization in probability are designed separately to ensure the output-feedback tracking can be achieved. According to swapping technique, we develop two filters and convert dynamic parametric models into a static one to which the gradient update law is chosen. The transient performance shows the tracking error is bounded.

关键词： Stochastic systems Nonlinear systems Adaptive control control systems Nonlinear control systems Programmable control Automatic control Robust control Error correction Sliding mode control

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Investigation and Analysis of the Influence of Magnetic Wedges on High Voltage Motors Performance

Investigation and Analysis of the Influence of Magnetic Wedg...

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Vehicle Power and Propulsion Conference

作者： Shuping Wang Zhengming Zhao Liqiang Yuan Buyao Wang Department of Electrical Engineering State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China Anhui Electric Power Research Institute Department of Electrical Engineering State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China Department of Electrical Engineering State Key Laboratory of Control and Simulation of Power System and Generation EquipmentTsinghua University Beijing China Corporation Company Ltd. Of XiangTan Electric Machine XiangTan China

ISBN: (纸本)9781424418480;9781424418497

关键词： Air-gap Magnetic Field Magnetic Slot Wedges Motor Performance

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Textured 3-D face reconstruction with two images in different views

Textured 3-D face reconstruction with two images in differen...

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Proceedings of the Biannual World Automation Congress

作者： Yuxing Mao He Wei Chunhua Feng Caixin Sun State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing China Centre for Pattern Recognition and Machine Intelligence (CENPARMI) Concordia University Montreal QUE Canada

In this paper, we present a new approach for textured 3-D face reconstruction based on two images in different views, which requires minimal user interaction by selecting eight pairs of feature points corresponding to each of the two images. These feature points have three functions: computing the fundamental matrix with the two face images based on epipolar geometry, estimating the poses of the images with respect to the pose of the frontal view, and determining the positions of the features for a rough adjustment of a generic 3-D face model. After the epipoles have been obtained, with the eight pairs of points as seeds, more matching points across the two images are detected under the constraints of epipolar lines. Then, the 3-D coordinates of the matching points can be computed with an SVD algorithm. After that, the generic 3-D model is adopted to optimize the constructed face model by eliminating the noise. Finally, the image closer to the frontal view is chosen as the texture map of our 3-D face model. Compared with some other previous works, there are fewer constraints to the poses of the images in our system and only one generic 3-D face model is needed. Experimental results demonstrate an encouraging performance of our method.

关键词： Image reconstruction Facial animation Humans Computational geometry Face detection Solid modeling Three dimensional displays Video sequences Sun Laboratories

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