With the increasing popularity of WWW, the main challenge in computer science has become content-based retrieval of multimedia objects. Until now access of multimedia objects in databases was done by means of keywords...
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ISBN:
(纸本)3540657622
With the increasing popularity of WWW, the main challenge in computer science has become content-based retrieval of multimedia objects. Until now access of multimedia objects in databases was done by means of keywords. Now, with the integration of feature-detection algorithms in database systems software, content-based retrieval can be fully integrated with query processing. In this invited paper, we describe our experimentation platform under development that fully integrates traditional query processing and content-based retrieval and that is based on feature databases, making database technology available to multimedia.
multimedia data security is very important for multimedia commerce on the Internet such as video-on-demand and real-time video multicast. Traditional cryptographic algorithms for data security are often not fast enoug...
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ISBN:
(纸本)0201485621
multimedia data security is very important for multimedia commerce on the Internet such as video-on-demand and real-time video multicast. Traditional cryptographic algorithms for data security are often not fast enough to process the vast amount of data generated by the multimedia applications to meet the realtime constraints. This paper presents a joint encryption and compression framework in which video data are scrambled efficiently in the frequency domain by employing selective bit scrambling, block shuffling and block rotation of the transform coefficients and motion vectors. The new approach is very simple to implement, yet provides considerable level of security, has minimum adverse impact on the compression efficiency, and allows transparency, transcodability, and other content processing functionalities without accessing the cryptographic key.
Power control in direct sequence-coded vision multiple access (DS-CDMA) systems and, more recently, power/rate allocation in multirate DS-CDMA based networks is an open and interesting research area which has attracte...
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Power control in direct sequence-coded vision multiple access (DS-CDMA) systems and, more recently, power/rate allocation in multirate DS-CDMA based networks is an open and interesting research area which has attracted much attention. However, with a few exceptions, most researchers have emphasized centralized resource allocation algorithms for cellular systems where the base station keeps track of the requirements of the various users and is thus responsible for the management of network resources. Ad hoc wireless local area networks (WLAN's), on the other hand, are generally configured as peer-to-peer networks with no centralized hub or controller. Thus resource allocation has to be conducted in a distributed fashion. We address the issue of distributed resource management for multirate DS-CDMA based multimedia WLAN's by 1) presenting a distributed resource allocation protocol, known as distributed resource negotiation protocol (DRNP) that builds on the RTS/CTS bandwidth reservation mechanism provided by IEEE 802.111, and provides quality of service (QoS) guarantees through distributed control of resources in DS-CDMA based multimedia WLAN's and 2) investigating the performance of various resource allocation schemes within the context of DRNP, in terms of network wide metrics such as overall throughput and blocking rates.
In this paper we describe music retrieval in ICOR (Intelligent content Retrieval), a project of Darmstadt TU. It is the goal of ICOR to find new interfaces to support applications of music video and music CDs. Althoug...
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ISBN:
(纸本)0819434396
In this paper we describe music retrieval in ICOR (Intelligent content Retrieval), a project of Darmstadt TU. It is the goal of ICOR to find new interfaces to support applications of music video and music CDs. Although the project consists of audio and video analysis we concentrate on a description of the audio algorithms in this paper. We describe our MPEG-7 like data structure to store meta information for music pieces and explain which algorithms we use to analyze the content of music pieces automatically. We currently use an applause detection to distinguish live music from studio recordings, a genre classifier to distinguish pieces with beats (for example disco music) from classical music, and a singer recognition.
The aim of the LeMO project is to create a multimedia information system on 20th century German history in the Internet. This work is carried out in a joint project by the Fraunhofer Institute for Software and systems...
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The aim of the LeMO project is to create a multimedia information system on 20th century German history in the Internet. This work is carried out in a joint project by the Fraunhofer Institute for Software and systems Engineering (ISST), the German Historical Museum in Berlin and the Haus der Geschichte of the Federal Republic of Germany in Bonn. The LeMO system provides various options for accessing its information. With the need in mind to make cultural content attractive to young people, 3D environments have been developed for each period of 20th century history. These presentations constitute a different way of looking at history. Visitors navigate through 3D spaces to the various museum exhibits and can request further multimedia information on historical events (text, images, audio and video material). access to specific content is also provided via a metadata-based search engine. The architecture of the LeMO system is based on Internet technologies (including VRML, HTML, streaming audio/video). This paper describes the concepts and implementations used within LeMO to structure and present information. By the end of 1998, 31 3D environments and over 4000 multimedia web pages covering various periods, topics, chronicles and biographies from German history had been developed for the virtual exhibition (***/lemo). From 1997-1998 LeMO was a project of DFN-Verein (the Association for the Promotion of a German Research Network) with financial support from Deutsche Telekom Berkom. In the LeMO + follow-up project funded by DFN-Verein, the LeMO system is to be given additional functionality and tested for use in the classroom. (C) 1999 Elsevier Science B.V. All rights reserved.
The deployment of information appliances is predicted to exceed that of personal computers in the next few years. However, due to the wide range of communication, processing, storage and display capabilities of inform...
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The deployment of information appliances is predicted to exceed that of personal computers in the next few years. However, due to the wide range of communication, processing, storage and display capabilities of information appliances, the multimediacontent on the internet needs to be adapted before it can be efficiently delivered to these devices. We present content Adaptation Framework (CAF), a general framework for customizing internet content for diverse client devices. The system first analyzes the content to be customized. Next, a variety of transcoders generate multi-resolution, multi-modal versions of the content. The transcoded versions of the multimediacontent are represented in a novel multi-modal, multi-resolution representation hierarchy called the InfoPyramid. Finally, a selection module uses an extended ratedistortion framework to pick the best content versions from the InfoPyramid while meeting the client device characteristics and resources. The content adaptation system can be deployed at various nodes in the internet topology, such as at the server, at the client device or at an intermediate proxy. We present examples of proxy and server content adaptation systems based on CAF. Based on the content adaptation framework, we present a description scheme for multimedia and internet content. This description scheme enables universal access to content. It has been proposed to various standards bodies.
The NOD article makes a difference to VOD data in terms of media type, size, creation interval and user interactivity. Because of these intrinsic characteristics, user access patterns of the NOD article can be differe...
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The NOD article makes a difference to VOD data in terms of media type, size, creation interval and user interactivity. Because of these intrinsic characteristics, user access patterns of the NOD article can be different from that of VOD data. In this paper, we analyze the log file of one electronic newspaper to show the short-term popularity and long-term popularity patterns. Based on these patterns, we propose LLBF (Largest Life-cycle Based Frequency) prefetching scheme that uses the two popularity patterns to cache a set of popular articles. In Simulation, we show that the proposed LLBF prefetching scheme increases hit ratio, and reduces the number of replacements more than other replacement algorithms as a small number of articles such as headline news is prefetched in main memory.
The Active HYpermedia Delivery System (AHYDS) within the NACSIS R&D department is an experimental advanced platform developed for delivering hypermedia documents over distributed and heterogeneous systems. The evo...
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This paper presents algorithms and principles for the management of large scale broadband multimedia services. For the implementation of these services we use a network of distributed media servers, storing broadband ...
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This paper presents algorithms and principles for the management of large scale broadband multimedia services. For the implementation of these services we use a network of distributed media servers, storing broadband media information e.g. audio and video that are streamed from the server to the connected clients. The problem studied in this paper is the managing of media content on a server network. We present the 'Distributed Server Management System (DSMS)' that performs an efficient content and service management on the distributed servers. The DSMS allows to collect access patterns from the users of the multimedia services and uses this knowledge for the solution of some combinatorial optimization algorithms that have to be solved for an efficient assignment of media assets. We present these optimization algorithms and evaluate their performance using some benchmark instances.
PNRS Personal News Retrieval System is a client-server application that delivers news segments on demand in a variety of information networks. At the server side, the news stories are segmented out from the digitized ...
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ISBN:
(纸本)0819434396
PNRS Personal News Retrieval System is a client-server application that delivers news segments on demand in a variety of information networks. At the server side, the news stories are segmented out from the digitized TV broadcast then classified and filtered based on consumers' preferences. At the client side, the user can access the preferred video news through the Web and watch stored video news in preferred order. Browsing preferences can be set based on anchorperson, broadcaster, category, location, top-stories and keywords. This system can be used to set up a news service run by content providers or independent media distribution companies. However, in the new era of enhanced PC/TV appliances, it is foreseeable that the whole system can run in the living room on a personal device. This paper describes the chosen server architecture, limitation of the system and solutions that can be implemented in the future.
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