Several types of content Distribution Networks are being deployed over the Internet today, based on different architectures to meet their requirements (e.g., scalability, efficiency and resiliency). Peer-to-peer (P2P)...
Several types of content Distribution Networks are being deployed over the Internet today, based on different architectures to meet their requirements (e.g., scalability, efficiency and resiliency). Peer-to-peer (P2P) based content Distribution Networks are promising approaches that have several advantages. Structured P2P networks, for instance, take a proactive approach and provide efficient routing mechanisms. Nevertheless, their maintenance can increase considerably in highly dynamic P2P environments. In order to address this issue, a two-tier architecture called Omicron that combines a structured overlay network with a clustering mechanism is suggested in a hybrid scheme. In this paper, we examine several sampling algorithms utilized in the aforementioned hybrid network that collect local information in order to apply a selective join procedure. Additionally, we apply the sampling algorithms on Chord in order to evaluate sampling as a general information gathering mechanism. The algorithms are based mostly on random walks inside the overlay networks. The aim of the selective join procedure is to provide a well balanced and stable overlay infrastructure that can easily overcome the unreliable behavior of the autonomous peers that constitute the network. The sampling algorithms are evaluated using simulation experiments as well as probabilistic analysis where several properties related to the graph structure are revealed.
This paper emphasises the importance of providing accessibility of Web-based information resources for everybody, not only for people with disabilities. Due to the continuous technical and social changes of the Web, i...
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ISBN:
(纸本)9789728865788
This paper emphasises the importance of providing accessibility of Web-based information resources for everybody, not only for people with disabilities. Due to the continuous technical and social changes of the Web, it is necessary to have in mind that new scenarios and user behaviour are appearing. Nowadays, most of Web sites use multimedia resources and it is indispensable to provide accessibility not only to the resource content, but the access to the resource in the Web site. This work summarises some items to take into account in order to make accessible a multimedia resource and present some best practices including on-line multimedia resources in a Web site.
Community services play a steadily growing role in the current World Wide Web. Especially services that provide video or other multimediacontent - in particular user-generated content - enjoy great popularity. With t...
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ISBN:
(纸本)9783540768890
Community services play a steadily growing role in the current World Wide Web. Especially services that provide video or other multimediacontent - in particular user-generated content - enjoy great popularity. With the integration of multimedia technology like video cameras or -players into mobile devices these services could also be used while on the move. Some mobile devices are already equipped with GPS receivers, compasses, thermometers and so on and therefore can be used for so called context-aware services. This allows for a variety of new, content-based community services. This paper introduces a metadata model that takes important features of context-aware multimedia community content on mobile devices into account. The model is used for automatic preselection and filtering of content based on context. Besides the annotation of multimediacontent with context, it supports the linkage between content and associated comments and the definition of access rights for different communities and its members. The proposed model is mapped on the MPEG-7 standard, a generic description tool for multimedia metadata.
A combination of three algorithms is proposed that gives a reasonable rate of success in image similarity searches. All use region based statistical measures using a combination of color features, linear features, and...
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A combination of three algorithms is proposed that gives a reasonable rate of success in image similarity searches. All use region based statistical measures using a combination of color features, linear features, and intensities combined with a collection of methods for subdividing the image into regions. All possible combinations were evaluated and the best (highest success rate) was selected to be used as a practical image similarity measure. Component algorithms are combined using a simple decision fusion voting scheme, giving success rates in the range of 50-60%. For a web search application this is quite reasonable.
The proceedings contain 74 papers. The topics discussed include: IMS secured content delivery over peer-to-peer networks;a methodology for the development of live audio and video services;performance of audio/video se...
The proceedings contain 74 papers. The topics discussed include: IMS secured content delivery over peer-to-peer networks;a methodology for the development of live audio and video services;performance of audio/video services on constrained variable user access lines;fusion predictors for discrete-time linear systems with multisensor environment;small tricks to enhance the accuracy of license plate character recognition;unsupervised algorithms for segmentation and clustering applied to soccer players classification;an improved super resolution reconstruction algorithm for video sequence;searching for a robust MFCC-based parameterization for ASR application;image restoration - a new explicit approach in filtering and restoration of digital images;adaptive and cooperative segmentation system for mono- and multi-component images;and a three-layer system for image retrieval.
This paper provides an overview of a pilot evaluation of video summaries using rushes from several BBC dramatic series. It was carried out under the auspices of TRECVID. Twenty-two research teams submitted video summa...
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ISBN:
(纸本)9781595937803
This paper provides an overview of a pilot evaluation of video summaries using rushes from several BBC dramatic series. It was carried out under the auspices of TRECVID. Twenty-two research teams submitted video summaries of up to 4% duration, of 42 individual rushes video files aimed at compressing out redundant and insignificant material. The output of two baseline systems built on straightforward content reduction techniques was contributed by Carnegie Mellon University as a control. Procedures for developing ground truth lists of important segments from each video were developed at Dublin City University and applied to the BBC video. At NIST each summary was judged by three humans with respect to how much of the ground truth was included, how easy the summary was to understand, and how much repeated material the summary contained. Additional objective measures included: how long it took the system to create the summary, how long it took the assessor to judge it against the ground truth, and what the summary's duration was. Assessor agreement on finding desired segments averaged 78% and results indicate that while it is difficult to exceed the performance of baselines, a few systems did. Copyright 2007 ACM.
In this paper we describe The MediaSquare, a 3D multimedia Environment we are currently developing, where users are impersonated as avatars enabling them to browse and experience multimediacontent by literally walkin...
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ISBN:
(纸本)1595937331
In this paper we describe The MediaSquare, a 3D multimedia Environment we are currently developing, where users are impersonated as avatars enabling them to browse and experience multimediacontent by literally walking through it. Users may engage in conversations with others, exchange experiences as well as collaboratively explore and enjoy the featured content. The combination of algorithms from the area of artificial intelligence with state-of-the-art 3D virtual environments creates an intuitive interface that provides access to automatically structured multimedia data taking advantage of spatial metaphors. Copyright 2007 ACM.
The MPEG-21 standard defines a framework for the interoperable delivery and consumption of multimediacontent. Within this framework the adaptation of content plays a vital role in order to support a variety of termin...
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ISBN:
(纸本)9780819466174
The MPEG-21 standard defines a framework for the interoperable delivery and consumption of multimediacontent. Within this framework the adaptation of content plays a vital role in order to support a variety of terminals and to overcome the limitations of the heterogeneous access networks. In most cases the multimediacontent can be adapted by applying different adaptation operations that result in certain characteristics of the content. Therefore, an instance within the framework has to decide which adaptation operations have to be performed to achieve a satisfactory result. This process is known as adaptation decision-taking and makes extensive use of metadata describing the possible adaptation operations, the usage environment of the consumer, and constraints concerning the adaptation. Based on this metadata a mathematical optimization problem can be formulated and its solution yields the optimal parameters for the adaptation operations. However, the metadata is represented in XML resulting in a verbose and inefficient encoding. In this paper, an architecture for an Adaptation Decision-Taking Engine (ADTE) is introduced. The ADTE operates both on XML metadata and on metadata encoded with MPEG's Binary Format for Metadata (BiM) enabling an efficient metadata processing by separating the problem extraction from the actual optimization step. Furthermore, several optimization algorithms which are suitable for scalable multimedia formats are reviewed and extended where it was appropriate.
There major challenges for current Intrusion Detection systems (IDS) which attempt to identify suspicious network traffic. Due to the high percentage of alerts generated by such systems, the level of false positives i...
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ISBN:
(纸本)9780769527772
There major challenges for current Intrusion Detection systems (IDS) which attempt to identify suspicious network traffic. Due to the high percentage of alerts generated by such systems, the level of false positives is among the significant problems. We present intelligent strategies for reduction of false positives and infrastructure protection using a novel approach using adaptive responses from firewall packet filters in what we call, network quarantine channels (NQC). The focus of this paper is on the responses from the packet filters which collaborate with the NQC to reply to suspicious hosts and them deny access to sensitive data servers in the infrastructure. The firewall packet filters provide effective intelligent responses by to granting access to the normal packets and denying malicious traffic access to the network, after the identity of the connections are verified through the statistical analysis in the NQC These effective strategies reduce false positives and increases detection capability of the IDS.
Open source principles and methodologies allow open access to both the development process and its products. This paper describes a number of significant research issues for the creation of novel development environme...
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ISBN:
(纸本)9781595937810
Open source principles and methodologies allow open access to both the development process and its products. This paper describes a number of significant research issues for the creation of novel development environments that support open source authoring of multimediacontent and dynamic forms of personalization during content consumption. These environments should allow an unlimited number of users to modify existing media content and post their contributions on the net. In addition, they should allow users to visualize the current state of development in each project, select a subset of the various contributions and dynamically compose, view and share with other users new content versions containing all the selected contributions. Furthermore, the paper describes a pilot web-services-based implementation for such a system developed in C# that is now freely available on the Web. Copyright 2007 ACM.
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