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A linear method for determining intrinsic parameters from two parallel line-segments

9th International Conference on intelligent Computing, ICIC 2013

作者： Tang, Jianliang Wang, Jie Chen, Wensheng College of Mathematics and Computational Science Shenzhen University Shenzhen 518060 China Key Laboratory of Multimedia and Intelligent Software College of Computer Science and Technology Beijing University of Technology Beijing 100022 China

ISBN: (纸本)9783642394812

In this paper, a linear method to determining intrinsic parameters from two parallel line-segments is proposed. Constrains based on the length ratio of line-segments are used to solve the camera calibration problem from images of two parallel line-segments under different conditions. And for each setting, we can get linear solution for intrinsic parameters of a usual camera. Simulated experiments are carried out to verify the theoretical correctness and numerical robustness of our results. © 2013 Springer-Verlag.

关键词： Cameras

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Weight calculation based image recognition

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Applied Mechanics and Materials 2013年 303-306卷 1577-1580页

作者： Yuan, Yifan Du, Junping Zhou, Jun Lu, Cheng Bai, Erwei Li, Yawen Beijing Key Laboratory of Intelligent Telecommunications Software and Multimedia School of Computer Science Beijing University of Posts and Telecommunications Beijing 100876 China School of Economics and Management Beijing University of Posts and Telecommunications Beijing 100876 China

ISBN: (纸本)9783037856529

The method to recognize facial expression in images quickly has been widely applied in many areas, but there is no way to take into account the accuracy and speed of recognition. This paper presents a method based on the weight calculation for fast expression recognition. It first calculates facial features based on active shape model, and then matches the features to the standard expression vector got by large number of image training and recognizes the expression in the static image. The experiments show that the system can provide fast, universal expression recognizing function under the premise of guaranteeing an ideal accuracy. © (2013) Trans Tech Publications, Switzerland.

关键词： Image recognition

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Stochastic Bounded Real Lemma for Switched Stochastic Systems with Average Dwell Time

Stochastic Bounded Real Lemma for Switched Stochastic System...

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IEEE Annual Conference on Decision and Control

作者： Hongji Ma Yingmin Jia Junping Du Fumitoshi Matsuno Department of Systems and Control LIMB Beihang University (BUAA) Beijing 100191 China Department of Systems and Control Beihang University (BUAA) Beijing 100191 China Beijing Key Laboratory of Intelligent Telecommunications Software and Multimedia School of Computer Science and Technology Beijing University of Posts and Telecommunications Beijing 100876 China Department of Mechanical Engineering and Science Graduate School of Engineering Kyoto University Kyoto 615-8540 Japan

ISBN: (纸本)9781467360890

This paper addresses the H_∞ performance and H_∞ control of switched stochastic linear systems subject to average dwell-time switching. At first, a sufficient condition is presented to guarantee the switched stochastic system to achieve a weighted H_∞ performance under the condition that all subsystems are asymptotic mean square stable. Further, the disturbance attenuation property of the considered systems is investigated when both stable and unstable subsystems are included. It is shown that if the active time of unstable subsystems is properly allocated, a stochastic bounded real lemma (SBRL) can be established based on the solvability of linear matrix inequalities (LMIs). As an application of the obtained SBRL, the robust control problem is settled for a class of switched stochastic systems with (x,u,v)-dependent noises, and the state-feedback H_∞ controller is developed.

关键词： dwell time stochastic systems SUB-SYSTEM attenuation characteristic Stochastic Lemma effective time Bounded computability Controllers

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Multifocus Image Fusion Using Local Perceived Sharpness

Multifocus Image Fusion Using Local Perceived Sharpness

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第25届中国控制与决策会议

作者： Liang Xu Junping Du JangMyung Lee Qian Hu Zhenhong Zhang Ming Fang Qian Wang Beijing Key Laboratory of Intelligent Telecommunication Software and Multimedia School of Computer Science Beijing University of Posts and Telecommunications Department of Electronics Engineering Pusan National University

ISBN: (纸本)9781467355339

Image fusion has become a valuable tool in many applications. In this paper, we propose a conceptually clear and intuitive algorithm for region-based image fusion. Our method considers the properties of multifocus images: in focus regions are clear, but out of focus regions are blurring. Source images are first decomposed into perceptually homogeneous regions and then combine them by use of local perceived sharpness （LPS）. Compared to several state-of-the-art image fusion algorithms, experimental results demonstrate that the proposed method is superior in both objective and visual evaluations.

关键词： Image Fusion Local Perceived Sharpness Superpixels

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Programmable virtual network as a service: Towards a future Internet testbed based on IaaS cloud

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Journal of China Universities of Posts and Telecommunications 2013年第SUPPL. 1期20卷 126-130页

作者： Liang, Jun-Xue Lin, Zhao-Wen Ma, Yan Wang, Yu-Ning Zhang, Can Mi, Zheng Li, Jian Network and Information Center Institute of Network Technology Beijing University of Posts and Telecommunications Beijing 100876 China Beijing Key Laboratory of Intelligent Telecommunications Software and Multimedia Beijing University of Posts and Telecommunications Beijing 100876 China AirForce Command College Beijing 100097 China

During recently years, several OpenFlow-enabled testbeds have been deployed in world-wide research community. Typically, these OpenFlow-enabled testbeds need to stitch to other testbeds to link to virtual servers and immit experimentation traffic. From the view point of researchers, these OpenFlow-enabled testbeds only provide OpenFlow networking resource, and they have to resort to other experiment infrastructure to provide computing and storage resource. Due to the OpenFlow networking and other resource belongs to different infrastructure provider and is managed by their own control software, it is difficult to coordinate these partners to provide a full programmable experiment environment. Meanwhile, the control software of these testbeds are tight coupling with their substrate resources, which means that these substrate resources, together with virtualization technologies, are permanently dedicated to the control software and difficult to be used by other services. In this paper, a new future Internet testbed architecture based on the open Infrastructure-as-a-service cloud and software defined network (SDN) paradigm is proposed. It extends the current virtual network service by adding programmable virtual switch and controller resources that can be controlled by the researcher. Its loose coupling model allows the testbed operator decouple the experiment service from the infrastructure provider, which is a more flexible way to build the testbed. The initial prototype implementation in this paper shows that this new testbed architecture built on IaaS cloud and SDN is feasible and flexible to provide programmable virtual network service. © 2013 The Journal of China Universities of Posts and Telecommunications.

关键词： Testbeds

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UAV Path Planning for Passive Multi-Target Following in Complex Environment

UAV Path Planning for Passive Multi-Target Following in Comp...

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第三十二届中国控制会议

作者： LIANG Yueqian WU Jingnan JIA Yingmin DU Junping The Seventh Research Division and the Department of Systems and Control Beihang University (BUAA) Beijing Key Laboratory of Intelligent Telecommunications Software and Multimedia School of Computer Science and Technology Beijing University of Posts and Telecommunications

ISBN: (纸本)9781479900305

In this paper the problem of following multiple noncooperative and high agile surface targets using multiple fixed- wing unmanned aerial vehicles (UAVs) in complex environment is studied and a real-time rule-based target following algorithm is proposed. The complex environment consists of hard threats, soft threats and sensor missed detections. The multi-dimensional assignment algorithm is applied to address the data association problem, and the target trajectory approximation algorithm is then developed to determine the motion trajectories of the targets. And a simulation example is given to verify the efficiency of the proposed algorithm.

关键词： Target Following, Path Planning, Complex Environment, Receding Horizon Control Problem, K-Coverage Problem

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Event-triggered Robust H∞ Control for Linear Systems with Disturbance

Event-triggered Robust H∞ Control for Linear Systems with D...

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第三十二届中国控制会议

作者： JIANG Hao ZHOU Haochong JIA Yingmin DU Junping The Seventh Research Division and the Department of Systems and Control Beihang University(BUAA) Beijing Key Laboratory of Intelligent Telecommunications Software and Multimedia School of Computer Science and TechnologyBeijing University of Posts and Telecommunications

ISBN: (纸本)9781479900305

Event-triggered control has received considerable attention for the benefits it brought,like reducing the resource utilization（e.g.,communication load and processor）,and providing more system ***,it requires persistent information of the system states to determine at which time the control input should be updated and transmitted to the plant. Self-triggered scheme was then proposed to eliminate this disadvantage,but also sacrifice the system *** tiffs paper,we introduce robust Htheory into self-triggered sample strategy,and achieve both resource utilization and disturbance attenuation properties at the same ***,we investigate the Nil-information feedback Hcontrol for the perturbed linear system in a very- general form,a sufficient condition guaranteeing the asymptotic stability- and robustness of the system is given in the form of LMI（Linear Matrix Inequality）.And the event condition is proposed based on the relative error between the current state and the state at last sample *** also exploit a corresponding self-triggered control system and give a method of designing the longest sampling period for the relevant Hcontroller on the premise that the system is stabilized and *** example is given to show the efficiency of the theoretical result.

关键词： Event-triggered Self-triggered Robust H_∞control Linear matrix inequality

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A quantifying method for trade-off between privacy and utility

A quantifying method for trade-off between privacy and utili...

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IET International Conference on Information and Communications Technologies, IETICT 2013

作者： Gu, Yonghao Wu, Weiming School of Computer Science Beijing University of Posts and Telecommunications China Beijing Key Laboratory of Intelligent Telecommunications Software and Multimedia Beijing University of Posts and Telecommunications China

ISBN: (纸本)9781849196536

Many anonymization methods have been used in data publishing and data mining. In the meantime, they reduce the utility of the dataset. So it is important to consider the tradeoff between privacy and utility. Quantifying the trade-off between usefulness and privacy of dataset has been the subject of much research in recent years. In this paper, we provide the concepts of privacy loss and utility loss and also give a method to quantify them using divergence distance in probability theory. And then, we evaluate our methodology on the Adult dataset from the UCI machine learning repository. Our result shows the relationship between privacy and utility, and also provide data users how to choose the right trade-off between privacy and utility. Finally, we conclude and show the future research direction on how to select best divergence measurement.

关键词： Data mining

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Privacy disclosure identification in social networks

Privacy disclosure identification in social networks

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2013 IEEE International Conference on Green Computing and Communications and IEEE Internet of Things and IEEE Cyber, Physical and Social Computing, GreenCom-iThings-CPSCom 2013

作者： Zhang, Feng Wu, Bin Wang, Bai Gao, Feng Beijing Key Laboratory of Intelligent Telecommunications Software and Multimedia Beijing University of Posts and Telecommunications 100876 Beijing China Network Technology Research Department China Unicom 100048 Beijing China

ISBN: (纸本)9780769550466

In online social network, users are much more likely to be influenced by their neighbor nodes and/or connected nodes which have comment interesting. Consequently, the nodes in social network are more easily to accepted the forwarded/recommended online applications from their familiar/trusted nodes. Although most online application have their own privacy policy and claim that they won't disclose users' privacy without users' consent, also, the user can choose pushed information forbidden to the certain online application, user may receive some pushed information from the third party. In this scenario, it is clearly that the online application has disclosed users' privacy information maybe with users' preferences/behavior to the third party for their commercial interests. In this paper, we study a novel privacy disclosure phenomenon that privacy disclosure by users' forwarded/recommended online application. We concrete with this privacy disclosure issue and propose a privacy identification method inspirited from Secure Multi-Party Computation (SMC) with both passive mode and active mode for this type of privacy disclosure identification. According to the analyze, our method can solve the privacy disclosure identification effectively. © 2013 IEEE.

关键词： Social networking (online)

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Super-resolution for surveillance facial images via shape prior and residue compensation

International Journal of Multimedia and Ubiquitous Engineeri...

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International Journal of multimedia and Ubiquitous Engineering 2013年第6期8卷 47-58页

作者： Lu, Tao Hu, Ruimin Jiang, Junjun Zhang, Yanduo He, Wei Hubei Province Key Laboratory of Intelligent Robot College of Computer Science and Engineering Wuhan Institute of Technology Wuhan 430073 China National Engineering Research Center on Multimedia Software Wuhan University Wuhan 430072 China Transportation Engineering Institute of Minjiang University Fuzhou 350001 China

Super-resolution (SR) methods are widely used to enhance the resolution of input images such as low-resolution (LR) remote or surveillance images. The key problem of SR algorithm is to introduce a proper prior for high-resolution (HR) image reconstruction. Usually pixel feature based similarity measure is used as prior. While in real surveillance applications, images are often disturbed by noise so that it is not enough to only use the prior from pixel domain to achieve satisfied high-resolution. In this paper, a two-phase based face hallucination approach via shape prior (SP) is proposed. Firstly, the Active Appearance Model (AAM) is used as shape prior to reconstruct the global face. Then the high frequency information as detailed inartificial facial features of HR face image is compensated to the global face. Experiments show that the proposed algorithm improves the subjective and objective quality of the input LR facial images and outperform many states-of-the-art superresolution methods. © 2013 SERSC.

关键词： Pixels

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