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IEEE International conference on Image Processing

作者： Symeon Papadopoulos Christos Zigkolis Giorgos Tolias Yannis Kalantidis Phivos Mylonas Yiannis Kompatsiaris Athena Vakali Informatics and Telematics Institute CERTH Thessaloniki Greece Department of Informatics Aristotle University of Thessaloniki Thessaloniki Greece Image Video and Multimedia Systems Laboratory NTUA Athens Greece

The wide adoption of photo sharing applications such as Flickr © and the massive amounts of user-generated content uploaded to them raises an information overload issue for users. An established technique to overcome such an overload is to cluster images into groups based on their similarity and then use the derived clusters to assist navigation and browsing of the collection. In this paper, we present a community detection (i.e. graph-based clustering) approach that makes use of both visual and tagging features of images in order to efficiently extract groups of related images within large image collections. Based on experiments we conducted on a dataset comprising publicly available images from Flickr © , we demonstrate the efficiency of our method, the added value of combining visual and tag features and the utility of the derived clusters for exploring an image collection.

关键词： Visualization Communities Vocabulary Clustering algorithms USA Councils Image edge detection Tagging

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Broadcast video streaming in cellular networks: An adaptation framework for channel, video and AL-FEC rates allocation

Broadcast video streaming in cellular networks: An adaptatio...

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International conference on Wireless Internet

作者： Daniele Munaretto Dan Jurca Joerg Widmer DoCoMo Conimunications Laboratories Europe GmbH Munich Germany

Video streaming is one of the most important applications that will make use of the high data rates offered by 4G networks. The current video transport techniques are already very advanced, and the more immediate problems lie in the joint optimization of video coding, AL-FEC, and PHY rate selection with the goal of enhancing the user perceived quality. In this work we provide an analysis of video broadcast streaming services for different combinations of layered coding and AL-FEC, using a realistic LTE PHY layer. Our simulation results show that the scalable content adaptation given by Scalable Video Coding (SVC) and the scheduling flexibility offered by the 3G-LTE MAC-layer provide a good match for enhanced video broadcast services for next generation cellular networks. Our proposed solution is compared to baseline algorithms and broadcast systems based on H.264/AVC streaming solutions. We emphasize the system quality improvement brought by our solution and discuss implications for a wide-scale practical deployment.

关键词： multimedia communication Broadcasting Streaming media Land mobile radio cellular systems Video compression Modulation coding Physical layer Static VAr compensators Base stations Video coding

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2010 International conference on Management of Data, SIGMOD '10

作者： Shinde, Rajendra Goel, Ashish Gupta, Pankaj Dutta, Debojyoti Stanford University Stanford CA United States Twitter Inc. San Francisco CA United States Cisco Systems Inc. San Jose CA United States

ISBN: (纸本)9781450300322

Similarity search methods are widely used as kernels in various data mining and machine learning applications including those in computational biology, web search/clustering. Nearest neighbor search (NNS) algorithms are often used to retrieve similar entries, given a query. While there exist efficient techniques for exact query lookup using hashing, similarity search using exact nearest neighbors suffers from a "curse of dimensionality", i.e. for high dimensional spaces, best known solutions offer little improvement over brute force search and thus are unsuitable for large scale streaming applications. Fast solutions to the approximate NNS problem include Locality Sensitive Hashing (LSH) based techniques, which need storage polynomial in n with exponent greater than 1, and query time sublinear, but still polynomial in n, where n is the size of the database. In this work we present a new technique of solving the approximate NNS problem in Euclidean space using a Ternary content Addressable Memory (TCAM), which needs near linear space and has O(1) query time. In fact, this method also works around the best known lower bounds in the cell probe model for the query time using a data structure near linear in the size of the data base. TCAMs are high performance associative memories widely used in networking applications such as address lookups and access control lists. A TCAM can query for a bit vector within a database of ternary vectors, where every bit position represents 0, 1 or*. The*is a wild card representing either a 0 or a 1. We leverage TCAMs to design a variant of LSH, called Ternary Locality Sensitive Hashing (TLSH) wherein we hash database entries represented by vectors in the Euclidean space into {0,1,*}. By using the added functionality of a TLSH scheme with respect to the*character, we solve an instance of the approximate nearest neighbor problem with 1 TCAM access and storage nearly linear in the size of the database. We validate our claims with extensive

关键词： Nearest neighbor search

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A Dynamic Cache Scheme for multimedia Streams on Heterogeneous Networking Environments

A Dynamic Cache Scheme for Multimedia Streams on Heterogeneo...

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3rd International conference on multimedia and Ubiquitous Engineering

作者： Hsu, Tz-Heng Li, Yueh-Heng So Taiwan Univ Dept Comp Sci & Informat Engn Tainan Taiwan

ISBN: (纸本)9780769536583

The portability and popularity of mobile devices make the access of Internet content become a common phenomenon. To support different mobile devices in the heterogeneous networking environments, digital content providers have to provide different versions of the multimedia streaming video for clients to choose. Traditional caching technology is not applicable to multimedia streaming proxy. Therefore, we propose a new caching algorithm with static weight transcoding graph and dynamic caching relation tree. With a transcoding proxy, the transmission time can be reduced by transcoding the original content before delivering it. In this paper, the proposed algorithm is compared with LRU and LFU cache algorithms in three parts: Hit Ratio, Byte Hit Ratio, and Average Transcoding Delay. Experimental results show that the proposed algorithm outperforms than traditional LRU and LFU cache algorithms.

关键词： Digital devices

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COMPRESSED VIDEO STREAM WATERMARKING FOR PEER-TO-PEER BASED content DISTRIBUTION NETWORK

COMPRESSED VIDEO STREAM WATERMARKING FOR PEER-TO-PEER BASED ...

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IEEE International conference on multimedia and Expo

作者： Zou, Dekun Prigent, Nicolas Bloom, Jeffrey Thomson Corporate Research

ISBN: (纸本)9781424442904

Peer-to-peer content distribution provides high network throughput with relatively low server cost and scales better than traditional content distribution networks with respect to the number of clients. It is ideal for applications requiring large data transfer such as Video-on-Demand or live video streaming. Traditional forensic watermarking systems are based on the assumption that each user receives a unique copy of video content to allow for tracking of pirated content back to the original recipient. However, P2P-based distribution systems are typically designed to supply identical copies to each user. This paper proposes a new watermarking framework that is suitable for P2P-based content delivery systems. Watermarking algorithms that are appropriate for this system are also discussed.

关键词： Peer-to-Peer Video Watermarking H.264/AVC content Distribution Network

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Virtualization as a Strategy for Maintaining Future access to multimedia content

Virtualization as a Strategy for Maintaining Future Access t...

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1st International conference on Advances in multimedia

作者： Holmqvist, Knut Halbach, Till Kristoffersen, Thor Norwegian Comp Ctr Oslo Norway

ISBN: (纸本)9781424444717

Virtualization and emulation techniques are getting better and better, and it feels thus natural to apply them to address the problem of data preservation for future content access. In this paper, we virtualized a number of existing servers and clients and ran the virtual machines tinder VMware's hypervisor. Not all of the investigated operating systems could be virtualized successfully, and even with successful conversions often settings had to he reconfigurated, and support for particular devices had to be added manually. It is concluded that many, operating systems are not flexible enough to allow for a problem-free conversion to a virtual machine.

关键词： Data preservation virtualization emulation hypervisor client server service multimedia MARIAGE

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Software Architecture For The Dynamic Creation of Visual Objects in Applications For the Internet with Interactive content

Software Architecture For The Dynamic Creation of Visual Obj...

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International conference on multimedia Computing and systems

作者： Bekkari, A. Mammass, D. Idbraim, S. Univ Ibn Zohr Fac Sci Lab IRF SIC Dept Math & Comp Sci Agadir Morocco

ISBN: (纸本)9781424437566

The visual representation of information is an interesting way of communication both in industrial and science. The viewing of interactive data gives the users a fun and immediate access to information they are looking for. In this context and with existing technologies that make Internet applications rich in content, we can ask our selves for the relevance of a software architecture dedicated to this type of media. We tried to design an architecture responding to our expectations, and its feasibility study by the realization of an application in the context of geographic mapping,

关键词： Architecture for Internet Data visualization SVG JAVA Batik JMF

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Novel Color Feature Representation and Matching Technique for content-based Image Retrieval

Novel Color Feature Representation and Matching Technique fo...

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International conference on multimedia Computing and systems

作者： Zhang, Zhenhua Li, Wenhui Lu, Yinan Jilin Univ Coll Comp Sci & Technol Changchun 130023 Peoples R China

ISBN: (纸本)9781424437566

Color features of an image are the most widely used features in content-based image retrieval (CBIR) [1][6] systems. Specifically histogram-based algorithms are considered to be effective for color image indexing. Color histogram [2] describes the global distribution of pixels of an image which is insensitive to variations in scale and easy to calculate. However, the high dimensionality of feature vectors results in high computation cost and space cost. In this paper, we mainly focus on color features and propose a novel method named Color Frequency Sequence Difference (CFSD) to express color images, which only has one numerical value in one color channel The CFSD is combined with information entropy to realize indexing. The novel approach is described in detail and compared with color histogram method presented in the literature. The experiment is finished and shows that the method proposed in this paper is effective and efficient

关键词： Image Retrieval Color Histogram content-based image retrieval (CBIR , Information Entropy

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Image quality assessment in multimedia applications

Image quality assessment in multimedia applications

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multimedia content access: algorithms and systems III

作者： Ciocca, G. Marini, F. Schettini, R. DISCo Dipartimento di Informatica Sistemistica e Comunicazione Universita Degli Studi di Milano-Bicocca Viale Sarca 336 20126 Milano Italy

In the framework of multimedia applications image quality may have different meanings and interpretations. In this paper, considering the quality of an image as the degree of adequacy to its function/goal within a specific application field, we provide an organized overview of image quality assessment methods by putting in evidence their applicability and limitations in different application domains. Three scenarios have been chosen representing three typical applications with different degree of constraints in their image workflow chains and requiring different image quality assessment methodologies. ©2009 SPIE-IS&T.

关键词： Image quality

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Evaluation of P2P multimedia clustering techniques in JXTA-Overlay

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multimedia systems 2009年第5期15卷 283-293页

作者： Xhafa, Fatos Barolli, Leonard Jaen, Enric Caballe, Santi Tech Univ Catalonia Dept Languages & Informat Syst Barcelona 08034 Spain FIT Dept Informat & Commun Engn Higashi Ku Fukuoka 8110295 Japan Open Univ Catalonia Dept Informat Sci Barcelona Spain

Efficient file searching is an essential feature in P2P systems. While many current approaches use brute force techniques to search files by meta information (file names, extensions or user-provided tags), the interest is in implementing techniques that allow content-based search in P2P systems. Recently, clustering techniques have been used for searching text documents to increase the efficiency of document discovery and retrieval. Integrating such techniques into P2P systems is important to enhance searching in P2P file sharing systems. While some effort has been taken for content-based searching for text documents in P2P systems, there has been few research work for applying these techniques to multimedia content in P2P systems. In this paper, we introduce two P2P content-based clustering techniques for multimedia documents. These techniques are an adaptation of the existing Class-based Semantic Search algorithm for text documents. The proposed algorithms have been integrated into a JXTA-based Overlay P2P platform, and evaluation results are provided. The JXTA-Overlay together with the considered clustering techniques is thus very useful for developing P2P multimedia applications requiring efficient searching of multimedia contents in peer nodes.

关键词： P2P networks P2P multimedia clustering Class-based Semantic Search JXTA content-based retrieval

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