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International image processing, Applications and Systems Conference (IPAS)

作者： Ali Ben Abbes Houcine Essid Imed Riadh Farah Vincent Barra Research Labortaory in Computer Integrated Documentation and Arabized-Documentiel Genuises and Software National School of Computer Science Manouba-Tunisia Department Image and Information Processing Telecom Bretagne Technopôle France Laboratory of Computer Modeling and System Optimization UMR CNRS 6158 Univcrsité Blaise Pascal AUBIERE CEDEX

Nowadays, the process of change detection is regarded as an outstanding way for urban planning and design. The major concern of this paper is to investigate the non-stationary character of multi-temporal time series. To overcome this problem, we propose an adaptive multiplicative decomposition of non-stationary multi-temporal satellite image, which allows to decompose the series into three components: trend, seasonal and random, to properly model the evolution of land cover. We carried several experiments to validate our approach based on Landsat images covering the region of “Tres Cantos-Madrid” in Spain. The obtained results show the effectiveness of our proposed method comparing to some conventional methods.

关键词： Time series analysis Market research Satellites Urban areas Additives Standards image processing

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Computational efficiency and universality of timed P systems with membrane creation

Communications in Computer and Information Science

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Communications in computer and Information Science 2014年 472卷 389-394页

作者： Song, Bosheng Pérez-jiménez, Mario J. Pan, Linqiang Key Laboratory of Image Information Processing and Intelligent Control School of Automation Huazhong University of Science and Technology WuhanHubei430074 China Department of Computer Science and Artificial Intelligence University of Sevilla Avda. Reina Mercedes s/n Sevilla41012 Spain

ISBN: (纸本)9783662450482

In this work, inspired from this biological motivation that in living cells, the execution time of different biological processes is difficult to know precisely and very sensitive to environmental factors that might be hard to control, the computational efficiency and universality of timed P systems with membrane creation are investigated. Specifically, we give a time-free solution to SAT problem by a family of P systems with membrane creation in the sense that the correctness of the solution is irrelevant to the times associated with the involved rules. We further show that time-free P systems with membrane creation are computationally universal. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Membranes

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Virtual Keyboard: Real-Time Finger Joints Tracking for Keystroke Detection and Recognition

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Arabian Journal for Science and Engineering 2013年 1-12页

作者： Yousaf, Muhammad Haroon Habib, Hafiz Adnan Video and Image Processing Laboratory Department of Computer Engineering University of Engineering and Technology Taxila Pakistan

This paper presents a finger joints tracking-based keystroke detection and recognition approach for the development of virtual keyboard. Activities of user’s hands are captured in a video sequence for the finger joints localization and tracking. Averaging background subtraction, connected component labeling and contour analysis are performed for hands region detection and finger joints localization. Probabilistic regional density-based kernel tracking estimates finger joint trajectories. Estimated trajectories are further interpreted into respective feature vectors based on spatial and pathic information. These feature vectors are fed into logic-based technique and Dynamic Bayesian Network for the classification of feature vectors leading towards the detection and recognition of keystrokes. Using actual video data set and real-time implementation, experimentation results demonstrate accurate keystroke detection and recognition for twenty eight (28) keys. Successful research results motivate for the inclusion of non-intrusive vision-based virtual keyboard in mobile devices in addition to existing tiny keypads for facilitation of the users.

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CHC-TSCM:A Trustworthy Service Composition Method Based on an Improved CHC Genetic Algorithm

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China Communications 2013年第12期10卷 77-91页

作者：曹步清刘建勋 Xiaoqing(Frank) LIU 李兵周栋康国胜 Key Laboratory of Knowledge Processing and Networked Manufacture School of Computer Science and EngineeringHunan University of Science and Technology Department of Computer Science Missouri University of Science and Technology State Key Laboratory of Software Engineering School of ComputerWuhan University

Trustworthy service composition is an extremely important task when service composition becomes infeasible or even fails in an environment which is open,autonomic,uncertain and *** paper presents a trustworthy service composition method based on an improved Cross generation elitist selection,Heterogeneous recombination,Catacly-smic mutation(CHC) Trustworthy Service Composition Method(CHC-TSCM) genetic *** firstly obtains the total trust degree of the individual service using a trust degree measurement and evaluation model proposed in previous *** combination and computation then are performed according to the structural relation of the composite ***,the optimal trustworthy service composition is acquired by the improved CHC genetic *** results show that CHC-TSCM can effectively solve the trustworthy service composition *** with GODSS and TOCSS,this new method has several advantages:1) a higher service composition successrate;2) a smaller decline trend of the service composition success-rate,and 3) enhanced stability.

关键词： QoS service trust model CHC gen-etic algorithm trustworthy service composition

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Uncertain subgraph query processing over uncertain graphs

Uncertain subgraph query processing over uncertain graphs

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15th Asia-Pacific Web Conference on Web Technologies and Applications, APWeb 2013

作者： Ruan, Wenjing Wang, Chaokun Han, Lu Peng, Zhuo Bai, Yiyuan School of Software Tsinghua University Beijing 100084 China Tsinghua National Laboratory for Information Science and Technology Tsinghua University China Department of Computer Science and Technology Tsinghua University China Key Laboratory of Intelligent Information Processing Institute of Computing Technology Chinese Academy of Sciences China

ISBN: (纸本)9783642374005

In some real-world applications, data cannot be measured accurately. Uncertain graphs emerge when this kind of data is modeled by graph data structures. When the graph database is uncertain, our query is highly possibly uncertain too. All of the prior works do not consider the uncertainty of the query. In this paper, we propose a new algorithm called Mutual-Match to solve the problem of uncertain subgraph query under the situation where both the graph dataset and the query are uncertain. Considering that the subgraph isomorphism verification is an NP-hard problem, and it will be more complex on uncertain graph data, the Mutual-Match algorithm uses MapReduce processes to find out all the subgraph matches and can adapt to dynamic graphs well. Experimental results on both real-world and synthetic datasets show the correctness and effectiveness of our proposed methods. © 2013 Springer-Verlag.

关键词： MapReduce

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SHREC'13 Track: Retrieval of objects captured with low-cost depth-sensing cameras 6

SHREC'13 Track: Retrieval of objects captured with low-cost ...

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6th Eurographics Workshop on 3D Object Retrieval, 3DOR 2013

作者： Machado, J. Ferreira, A. Pascoal, P.B. Abdelrahman, M. Aono, M. El-Melegy, M. Farag, A. Johan, H. Li, B. Lu, Y. Tatsuma, A. INESC-ID IST Technical University of Lisbon Portugal Microsoft Language Development Center Portugal Toyohashi University of Technology Japan Department of Computer Science Texas State University San Marcos United States Fraunhofer IDM at NTU Singapore Singapore Computer Vision and Image Processing Laboratory University of Louisville Louisville United States

ISBN: (纸本)9783905674446

The SHREC'13 Track: Retrieval of Objects Captured with Low-Cost Depth-Sensing Cameras is a first attempt at evaluating the effectiveness of 3D shape retrieval algorithms in low fidelity model databases, such as the ones captured with commodity depth cameras. Both target and query set are composed by objects captured with a Kinect camera and the objective is to retrieve the models in the target set who were considered relevant by a human-generated ground truth. Given how widespread such devices are, and how easy it is becoming for an everyday user to capture models in his household, the necessity of algorithms for these new types of 3D models is also increasing. Three groups have participated in the contest, providing rank lists for the set of queries, which is composed of 12 models from the target set. © The Eurographics Association 2013.

关键词： Cameras

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Application layer FEC with long time interleaver and fast tune-in for mobile satellite TV services

Application layer FEC with long time interleaver and fast tu...

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International Conference on Computing, Networking and Communications (ICNC)

作者： Valentina Pullano Cornelius Hellge Manuel Hensel Giovanni E. Corazza Thomas Schicrl Department of Electronics Computer Science and Systems University of Bologna Bologna Italy Image Processing Department Fraunhofer HHI Multimedia Communications Group Berlin Germany Multimedia Communications Group Image Processing Department Fraunhofer HHI Berlin Germany Image Communication Laboratory Berlin Institute of Technology Berlin Germany

Satellite distribution provides a cost-efficient way to expand the coverage of mobile networks to rural areas. However, to become widely accepted by users and content providers, mobile satellite services need to provide a Quality of Experience (QoE) comparable to that of mobile video services provided in cellular networks. Mobile reception by satellite is characterized by shadowing periods where the Line-Of-Sight (LoS) is lost. The only way to overcome these outage periods is to provide the means for implementing long time interleaving. Nonetheless, existing approaches for long time interleaving come at the cost of a long service tune-in time, which may last in the satellite case up to several seconds. The present work aims at demonstrating the achievable performance using an innovative approach based on the use of long time interleaving and fast service tune-in by means of application-layer forward error correction (AL-FEC), Scalable Video Coding (SVC) and unequal time interleaving. Within this work we show the performance of the novel approach in the satellite context comparing it to existing solutions.

关键词： Forward error correction Mobile communication Satellites Static VAr compensators Decoding Satellite broadcasting Media

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Relationship exploration among PPI, ATGP and VCA via theoretical analysis

Relationship exploration among PPI, ATGP and VCA via theoret...

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作者： Chang, Chein-I. Wen, Chia-Hsien Wu, Chao-Cheng Department of Computer Science and Electrical Engineering Remote Sensing Signal and Image Processing Laboratory University of Maryland 1000 Hilltop Circle Baltimore MD 21250 United States Department of Computer Science and Information Engineering Providence University Taichung Taiwan Department of Computer Science and Information Management Providence University 200 Taiwan Boulevard Shalu Dist. Taichung City 43301 Taiwan Department of Electrical Engineering National Taipei University of Technology 1 Zhongxiao E. Rd. Taipei 106 Taiwan

The principle of orthogonality using orthogonal projection (OP) is the key concept to develop mean squared error estimation theory in signal processing and communications. It has also found its way in a wide variety of applications in hyperspectral imaging. This paper explores close relationships among three OP-based algorithms, pixel purity index (PPI), vertex component analysis (VCA) in endmember extraction, automatic target generation process (ATGP) in mixed pixel classification and target detection, etc. and further shows that they indeed can be interpreted one way or another. Specifically, VCA and ATGP are essentially the same algorithm in the sense that they both extract targets via maximal OP from a nested sequence of successive orthogonal subspace projection spaces. Copyright © 2013 Inderscience Enterprises Ltd. Copyright © 2013 Inderscience Enterprises Ltd.

关键词： Hyperspectral imaging

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Route planning based on gradient-field quantum genetic algorithm model

Journal of Software

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Journal of software 2013年第10期8卷 2511-2516页

作者： Sun, Yangguang Ding, Mingyue College of Computer Science South-Central University for Nationalities State Key Laboratory of Software Engineering Wuhan University Wuhan 430074 China School of Life Science and Technology 'Image Processing and Intelligence Control' Key Laboratory of Education Ministry of China Huazhong University of Science and Technology Wuhan 430074 China

A route planning method based on gradient-field quantum genetic algorithm model was presented in this paper. It introduces the gradient field of a grid map to quantum genetic algorithm model and uses quantum genetic algorithm (QGA) to optimize the cost function of route planning. By combining the quantum characteristics with the capabilities of the large diversity of the population, as well as fast convergence rate and high global searching, the optimization of route was guided and realized in our method by using the genetic operators with the essential characteristics of quantum and the gradient information of a grid map. Experimental results demonstrated that our method further effectively improves the quick convergence and capability of searching the optimal route. © 2013 ACADEMY PUBLISHER.

关键词： Cost functions

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TriggerCas: Enabling wireless consrucive collisions

TriggerCas: Enabling wireless consrucive collisions

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IEEE Annual Joint Conference: INFOCOM, IEEE computer and Communications Societies

作者： Yin Wang Yuan He Dapeng Cheng Yunhao Liu Xiang-yang Li MOE Key Laboratory for Information System Security School of Software TNLIST Tsinghua University China Department of Computer Science and Engineering Hong Kong University of Science and Technology Hong Kong China Key Laboratory of Intelligent Information Processing Universities of Shandong China Department of Computer Science Illinois Institute of Technology USA

Constructive Interference (CI) proposed in the existing work (e.g., A-MAC [1], Glossy [2]) may degrade the packet reception performance in terms of Packet Reception Ratio (PRR) and Received Signal Strength Indication (RSSI). The packet reception performance of a set of nodes transmitting simultaneously might be no better than that of any single node transmitting individually. In this paper, we redefine CI and propose TriggerCast, a practical wireless architecture which ensures concurrent transmissions of an identical packet to interfere constructively rather than to interfere non-destructively. CI potentially allows orders of magnitude reductions in energy consumption and improvements in link quality. Moreover, we for the first time present a theoretical sufficient condition for generating CI with IEEE 802.15.4 radio: concurrent transmissions with an identical packet should be synchronized at chip level. Meanwhile, co-senders participating in concurrent transmissions should be carefully selected, and the starting instants for the concurrent transmissions should be aligned. Based on the sufficient condition, we propose practical techniques to effectively compensate propagation and radio processing delays. TriggerCast has 95 th percentile synchronization errors of at most 250ns. Extensive experiments in practical testbeds reveal that TriggerCast significantly improves PRR (from 5% to 70% with 7 concurrent senders, from 50% to 98.3% with 6 senders) and RSSI (about 6dB with 5 senders).

关键词： Delays Synchronization Signal to noise ratio Receivers Wireless sensor networks IEEE 802.15 Standards

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