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检索条件"机构=Multimedia Information Systems and Advanced Computing Laboratory"

共 502 条记录，以下是411-420 订阅

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Integration of global and local information in videos for key frame extraction

Integration of global and local information in videos for ke...

引用

IEEE International Conference on information Reuse and Integration (IRI)

作者： Dianting Liu Mei-Ling Shyu Chao Chen Shu-Ching Chen Department of Electrical and Computer Engineering University of Miami Coral Gables FL USA Distributed Multimedia Information Systems Laboratory School of Computing and Information Sciences Florida International University Miami FL USA

Key frame extraction methods aim to obtain a set of frames that can efficiently represent and summarize video contents and be reused in many video retrieval-related applications. An effective set of key frames, viewed as a high-quality summary of the video, should include the major objects and events of the video, and contain little redundancy and overlapped content. In this paper, a new key frame extraction method is presented, which not only is based on the traditional idea of clustering in the feature extraction phase but also effectively reduces redundant frames using the integration of local and global information in videos. Experimental results on the TRECVid 2007 test video dataset have demonstrated the effectiveness of our proposed key frame extraction method in terms of the compression rate and retrieval precision.

关键词： Videos Feature extraction Data mining Gray-scale Redundancy Filtering Image color analysis

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User-level virtual networking mechanisms to support virtual machine migration over multiple clouds

User-level virtual networking mechanisms to support virtual ...

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IEEE Globecom Workshops

作者： Maurício Tsugawa Pierre Riteau Andréa Matsunaga José Fortes Advanced Computing and Information Systems Laboratory Department of Electrical and Computer Engineering University of Florida Gainesville FL USA IRISA Laboratory Université de Rennes 1 Rennes France

Dynamic allocation of multiple cloud resources adapting to application needs over time can be achieved by taking advantage of wide-area VM live migration technologies. However, migration of VMs across different subnets, potentially in multiple clouds, requires networking support to keep the network state of moving VMs unchanged. Two problems make traditional solutions to machine mobility inefficient in this scenario: (1) administrative overheads due to coordination requirements between moving machines and the network infrastructure; and (2) degraded network performance of machines moved away from their “home” networks. New solutions are needed to efficiently support the migration of virtual machines over multiple cloud providers. The user-level virtual network architecture presented in this paper implements mechanisms to allow VM migration over clouds without requiring support from the physical network infrastructure, and automatically reconfiguring virtual networks to maximize the network performance of migrated virtual machines.

关键词： IP networks Virtual machining Routing Cloud computing Virtual machine monitors Software

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A spatiotemporal text localization and identification approach for content-based video browsing 09

A spatiotemporal text localization and identification approa...

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7th International Conference on Advances in Mobile computing and multimedia, MoMM2009

作者： Bouaziz, Bassem Mahdi, Walid Zlitni, Tarek Benhamadou, Abdelmajid MIRACL: Multimedia Information Systems and Advanced Computing Laboratory CP 1030 Sfax Tunisia

ISBN: (纸本)9781605586595

Text in videos contains much semantic information that can be used for video indexing and browsing. In this paper, we propose a spatiotemporal video-text localization and identification approach which proceeds in two main steps: text region localization and text region identification. In the first step we detect the significant appearance of the new objects in a frame by a split and merge processes applied on binarized edge frame pair differences. Detected objects are, a priori, considered as text. They are then filtered according to both local contrast and texture criteria in order to get the effective ones. The resulted text regions are identified based on a visual grammar descriptor containing a set of semantic text class regions characterized by visual features. A visual table of content is generated based on extracted text regions occurring within video sequence enriched by a semantic identification. The experimentation performed on a variety of video sequences shows the efficiency of our. Copyright 2009 ACM.

关键词： Semantics

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The distributed maximum power point tracking method and application in the PV grid-connected generation

The distributed maximum power point tracking method and appl...

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International Conference on Intelligent System Design and Engineering Application (ISDEA)

作者： Zhao, Tingting Ju, Zhenhe Wang, Hongjiang Wei, Xiaopeng Li, Xiaoxiao Shi, Zhang School of Management Dalian University of Technology Dalian China New Energy Center Shenyang Institute of Engineering Shenyang China Department of Information and Engineering Shenyang Institute of Engineering Shenyang China Key Laboratory of Advanced Design and Intelligent Computing Ministry of Education Dalian University Dalian China Department of Study Liaoning Solar Energy R and D Co. Ltd. Shenyang China Institute of Systems Engineering Northeastern University Shenyang China

ISBN: (纸本)9780769542126

In the system of the PV grid-connected generation, because of the dispersion of the PV panel, difference of the sun radiation condition and the shadow of a part of the PV panel, they will cause the serious loss of energy for the parallel PV panel. In order to overcoming energy loss and raise the efficiency of the PV system, a new maximum power point tracking method called distributed variable step duty ratio perturb method is put forward. The distributed MPPT method overcomes the shortcomings to generate electricity quantity to descend because of the dispersion of the PV panel. The variable step duty ratio perturbing method speed quickly and is more suitable for this kind of distributed generation system. The hardware adopts DC/DC electric circuit to regulate PWM duty ratio. The software adopts TMS320-2812. An example is given to show that this method is able to realize distributed MPPT. In addition, the calculation speed of the approach is quick, accuracy of the approach is better, and the system has a high stability. © 2010 IEEE.

关键词： Maximum power point trackers

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Hand localization and fingers features extraction: Application to digit recognition in sign language

引用

10th International Conference on Intelligent Data Engineering and Automated Learning, IDEAL 2009

作者： Jmaa, A. Ben Mahdi, W. Jemaa, Y. Ben Hamadou, A. Ben Multimedia InfoRmation Systems and Advanced Computing Laboratory Tunisia Signal and System Research Unit Tunisia

ISBN: (纸本)3642043933

We present in this paper an approach of hand gesture analysis that aims at recognizing a digit. The analysis is based on extracting a set of features from a hand image and then combining them by using an induction graph. The most important features we extract from each image are the fingers locations, their heights and the distance between each pair of fingers. Our approach consists of three steps: (i) Hand localization, (ii) fingers extraction and (iii) features identification and combination to digit recognition. Each input image is assumed to contain only one hand with black background, thus we apply a classifier based on one skin color to identify the skin pixels. In the finger extraction step, we attempt to remove all the hand components except the fingers, this process is based on the hand anatomy properties. The final step is based on histogram representation of the detected fingers which results in the features identification, which results in the digit recognition. The approach is invariant to scale, rotation and translation of the hand. Some experiments have been undertaken to show the effectivness of the proposed approach. © 2009 Springer Berlin Heidelberg.

关键词： Feature extraction

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Structural relevance feedback in XML retrieval

Structural relevance feedback in XML retrieval

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8th International Conference on Flexible Query Answering systems, FQAS 2009

作者： Kamoun Fourati, Inès Tmar, Mohamed Hamadou, Abdelmajid Ben Multimedia Information Systems and Advanced Computing Laboratory High Institute of Computer Science and Multimedia University of Sfax Sfax Tunisia

ISBN: (纸本)3642049567

Contrarily to classical information retrieval systems, the systems that treat structured documents include the structural dimension through the document and query comparison. Thus, the retrieval of relevant results means the retrieval of document fragments that match the user need rather than the whole document. So, the structure notion should be taken into account during the retrieval process as well as during the reformulation. In this paper we propose an approach of query reformulation based on structural relevance feedback. We start from the original query on one hand and the fragments judged as relevant by the user on the other. Structure hints analysis allows us to identify nodes that match the user query and to rebuild it during the relevance feedback step. The main goal of this paper is to show the impact of structural hints in XML query optimization. Some experiments have been undertaken into a dataset provided by INEX to show the effectiveness of our proposals. © 2009 Springer-Verlag Berlin Heidelberg.

关键词： XML

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Query reformulation based on relevance feedback

Query reformulation based on relevance feedback

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8th International Conference on Flexible Query Answering systems, FQAS 2009

作者： Taktak, Imen Tmar, Mohamed Hamadou, Abdelmajid Ben Multimedia Information Systems and Advanced Computing Laboratory High Institute of Computer Science and Multimedia University of Sfax Sfax Tunisia

ISBN: (纸本)3642049567

In a Relevance Feedback process, the query can be reformulated basing on a matrix product of the RSV (Retrieval Status Value) vector and the documents-terms matrix. In such case, the challenge is to determine the most appropriate query that fulfils the retrieval process. In this paper, we present an automatic query reformulation approach based on a dual form of this product matrix which systematically generate as solution the reformulated query. This approach was spread to assure a learning strategy in order to rank the results of an information retrieval system. Some experiments have been undertaken into a dataset provided by TREC and the results show the effectiveness of our approach. © 2009 Springer-Verlag Berlin Heidelberg.

关键词： Search engines

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A new approach for TV program identification based on video grammar 09

A new approach for TV program identification based on video ...

引用

7th International Conference on Advances in Mobile computing and multimedia, MoMM2009

作者： Zlitni, Tarek Mahdi, Walid Ben Abdallah, Hanène Mir at cl Multimedia Information Systems and Advanced Computing Laboratory Higher Institute of Computer Science and Multimedia BP 3021 Sfax 69042 Tunisia

ISBN: (纸本)9781605586595

In this paper, we propose a new approach to identify programs in TV streams. In the first step of our approach, we construct a reference catalogue for video grammars of visual jingles. In the second step, we identify programs in TV streams by examining the similarity of the video signal to the visual grammars in the catalogue. After presenting our approach, we report the results of its experimental evaluation on several streams extracted from different channels and composed of several programs. Copyright 2009 ACM.

关键词： Indexing (of information)

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A new Gaussian Radial Basis Function Neural Network controller for induction motor control drives

A new Gaussian Radial Basis Function Neural Network controll...

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Mediterranean Conference on Control and Automation (MED)

作者： L. Barazane M. Laribi M.M Krishan R. Ouiguini Faculty of Electronic and Computing University of the Sciences and Technology Houari Boumediene (USTHB) Algiers Algeria Department of Electronic Engineering Polytechnic National School of Algiers Algiers Algeria Engineering of information and measurement systems Al-Balqa Applied University Jordan Laboratory of Robotic and artificial Intelligence Centre for Development of Advanced Technologies Algiers Algeria

The principal objective of this work consists in reducing the chattering phenomenon and ensuring more improvement of performances the proposed control scheme especially ensuring the decoupling between the control of the two principle variables of the motor “speed and flux” and also the system's robustness towards parameter's variations and external perturbations. In fact and as a first step a control scheme based on the combination of feedback linearization control is first proposed. Then, and in order to ensure more robustness of the process towards parameter's variations and external perturbation...ect, sliding mode controllers are used. These controllers are based on a piecewise function for smoothing in order to reduce the effect of the chattering phenomenon which is harmful of the actuator. However, this smooth function is relied closely to the upper bound of uncertainties, which include parameter variations and external disturbances. So, fuzzy sliding mode controllers are investigated to solve this difficulty based on the method introduced by Ben-Galia et al. By replacing the gain and the signum of the attractivity function of sliding mode controllers by fuzzy maps. However, it seems that this technique couldn't reduced the chattering considerably which let the authors to propose another type of controllers based on Gaussian Radial Basis Function Neural Network (GRBFNN) which revealed some very interesting features and prove that such controllers are efficients to attempt the required objectives.

关键词： Sliding mode control Induction motors Robustness Switches Neurons Process control

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Multi-objective optimization conceptual design of solar energy product based on hybrid genetic algorithm

Multi-objective optimization conceptual design of solar ener...

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International Conference on Computer Design and Applications (ICCDA)

作者： Tingting Zhao Zhenhe Ju Xiaopeng Wei Shi Zhang Shuaijie Wang Xiaoxiao Li School of Management Dalian University of Technology Dalian China Key Laboratory of Advanced Design and Intelligent Computing Ministry of Education Dalian University Dalian China New Energy Center Shenyang Institute of Engineering Shenyang China Institute of Systems Engineering College of Information Science and Engineering Northeastern University Shenyang China Department of study Liaoning Solar Energy R and D Company Limited Shenyang China

ISBN: (纸本)9781424471645;9781424471638

For research on conceptual design of the complex product, it is necessary that a reliable theory is found to decide if the design structure is suit for custom requirement. The correlation matrixes among requirements, functions and structures are proposed. A block diagonal matrix of correlation matrix between functions and structures is given. The mathematical models of multi-object optimization structure design are provided, and then calculated by the hybrid genetic algorithm. An example for solar energy automobile is given to show that this method is able to realize optimization structure design fitting for the requirements. In addition, the approaches can provide good Pareto optimization solutions.

关键词： Design optimization Algorithm design and analysis Solar energy Genetic algorithms Genetic engineering Design engineering Power engineering and energy Mathematics Pareto optimization Reliability engineering

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