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检索条件"任意字段=Conference on Multimedia Content Access - Algorithms and Systems"

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Connection admission control for a high capacity multimedia satellite communication system

Connection admission control for a high capacity multimedia ...

引用

IEEE Global Communications conference (GLOBECOM 99)

作者： Qian, Y Hu, R Abu-Amara, H Maveddat, P Nortel Networks Richardson TX 75082 USA

ISBN: (纸本)0780357973

With their tremendous success in broadcasting entertainment services, digital satellite systems are rapidly being viewed as viable service delivery vehicles. In parallel, both the demand for Internet and multimedia services and the subsequent end-user demand for higher bandwidth are forcing network operators to search for mechanisms that can cost effectively provide high speed access to end-users. Network operators are seriously considering satellite based networks to offer broadband and multimedia services to supplement and enhance their existing terrestrial networks. One solution is based on a geosynchronous (GEO) satellite system equipped with on-board processing and switching. Allowing for a maximum number of simultaneous users is an important element of this system, hence requiring effective connection admission control (CAC) and bandwidth on demand (BOD) algorithms. In this paper, a CAC scheme is studied for the uplink segment of a broadband GEO satellite network with an on-board ATM-like switch. A MF-TDMA scheme is used for the uplink access. The CAC algorithm investigated is ATM-based with heterogeneous traffic traversing the satellite network. Performance evaluations of the CAC algorithm are done by detailed simulations. Connection blocking performance results are given for each type of traffic in the system.

关键词： Satellite communication systems

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content-based retrieval using heuristic search 99

Content-based retrieval using heuristic search

引用

22nd International conference on Research and Development in Information Retrieval

作者： Papadias, D Mantzourogiannis, M Kalnis, P Mamoulis, N Ahmad, I Hong Kong Univ Sci & Technol Dept Comp Sci Clear Water Bay Hong Kong Peoples R China

ISBN: (纸本)1581130961

The fast growth of multimedia information in image and video databases has triggered research on efficient retrieval methods. This paper deals with structural queries, a type of content-based retrieval where similarity is not defined on visual properties such as color and texture, but on object relations in space. We propose the application of heuristic algorithms which provide good, but not necessarily optimal, solutions in a pre-determined time period, and compare our approach with systematic search methods which are guaranteed to find optimal solutions but require exponential time in the worst case. The quality of the output is calculated using a relation framework which is an extension of Alien's relations. With this framework our methods can be applied in multiple resolutions and dimensions, thus covering a wide range of applications in spatial, multimedia and video systems.

关键词： MMIR content-based indexing/retrieval image indexing/retrieval

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access control and handoff management in multi-tier multimedia wireless systems 1

Access control and handoff management in multi-tier multimed...

引用

1st IEEE Annual Wireless Communications and Networking conference, WCNC 1999

作者： Iera, Antonio Modafferi, Antonino Molinaro, Antonella Reggio Calabria89100 Italy Dep. of Mathematics University of Messina Salita Sperone C.da Papardo Messina98166 Italy

ISBN: (纸本)0780356683

In this paper new techniques are proposed for the handling of multimedia traffic in a hierarchical multi-tier system involving microcellular, macrocellular and satellite coverage. In this environment, efficient channel assignment and hand-off management techniques become critical issues to fully exploit the benefits of the multi-layered architecture. The traffic flow control between layers has to maximise the system capacity without degrading the traffic QoS. This task is particularly hard when in the presence of multimedia calls, which ask for large amount of bandwidth and are characterised by the combination of traffic of different nature. The proposed algorithms differ from the traditional ones as they adopt a multi-bearer transport approach to carry multimedia traffic over the air-interface, coupled with suitable strategies for the allocation of each traffic component at the best layer. This leads to better resource utilisation and multimedia QoS guarantees, while minimising new call blocking and hand-off failure probabilities. © 1999 IEEE.

关键词： access control

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Extraction of composite visual objects from audiovisual materials

Extraction of composite visual objects from audiovisual mate...

引用

conference on multimedia Storage and Archiving systems IV

作者： Durand, G Thienot, C Faudemay, P Univ Paris 06 Lab Informat Paris 6 F-75252 Paris 05 France

ISBN: (纸本)0819434396

An effective analysis of Visual Objects appearing in still images and video flames is required in order to offer fine grain access to multimedia and audiovisual contents. In previous papers, we showed how our method for segmenting still images into visual objects could improve content-based image retrieval and video analysis methods. Visual Objects are used in particular for extracting semantic knowledge about the contents. However, low-level segmentation methods for still images are not likely to extract a complex object as a whole but instead as a set of several sub-objects. For example, a person would be segmented into three visual objects: a face, hair, and a body. In this paper, we introduce the concept of Composite Visual Object. Such an object is hierarchically composed of sub-objects called Component Objects. Production rules implementing some common sense knowledge are used to extract and label composite visual objects based on the output of our still image segmentation method, and to label the component objects with their semantic values. Composite visual objects of the database (e.g.: "persons") can then be searched for, possibly with some constraints on some of their components (e.g.: "only with a blue suit!").

关键词： composite visual objects visual object extraction image segmentation multimedia content analysis MPEG-4 MPEG-7

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content-based retrieval for image databases

Content-based retrieval for image databases

引用

作者： Li, Fang Dalhousie University

学位级别：硕士

Advances in digital storage and processing speed have made feasible the creation of large image databases with rapid access to individual items stored therein. The huge data sizes of images and the enormous number of images in a typical image database, coupled with inexact nature and subjective interpretations, have called for content-based retrieval systems. Fast and accurate retrievals are crucial for such systems to be used efficiently. This project provides an overview on the content-based Image Retrieval (CBIR) techniques developed recently. Research directions and current available CBIR systems are presented. Important issues such as image segmentation algorithms, image logic structure and spatial relationships, spatial access methods and Query by Visual Example techniques (QVE) are discussed in detail. A prototype image retrieval system called IMAGESEEK is implemented using the JAVA programming language. The system enables the search of natural colour images and demonstrates the various ideas of Query by Visual Example techniques. A framework for CBIR systems is proposed. Experimental results of different QVE algorithms are discussed and compared with each other. The system has been successful in retrieving images from our sample data sets by their global and local colours. The user-friendly interface of IMAGESEEK allows the user to tailor and refine the query interactively by changing the retrieval algorithm, the threshold value, the weights, and the selected region of the query image. IMAGESEEK provides us a way to understand the key issues of CBIR techniques. It is a small but valuable component in the collection of multimedia retrieval systems.

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Adaptive multishot canceler for wideband CDMA systems

Adaptive multishot canceler for wideband CDMA systems

引用

IEEE VTS 50th Vehicular Technology conference, VTC 1999-Fall

作者： Tang, Xin Bar-Ness, Y. Van Waes, N.J.M. Center for Communications and Signal Processing Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ 07102 United States

ISBN: (纸本)0780354354

With the demand for high capacity (multimedia) services, wideband CDMA (WCDMA) has become an attractive multiple access scheme for 3rd generation wireless systems. Coming with higher data rate, the application of WCDMA brings with it new challenges in terms of multiple access interference (MAI) and inter-symbol interference (ISI) suppression due to the fact that compared to the 'regular' CDMA, the delay spread is no longer only a few chips. Most of the literature on multiuser detection so far focused on algorithms which, due to high computational/hardware complexity, are unsuitable for large delay spread channels. In this paper, we present an adaptive symbol-based signal separator based on multishot matched filtering which is suitable for the asynchronous large delay spread fading channels characteristics. © 1999 IEEE.

关键词： Multiple access interference

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Managing large scale broadband multimedia services on distributed media servers

Managing large scale broadband multimedia services on distri...

引用

IEEE International conference on multimedia Computing and systems (ICMCS)

作者： R. Luling Department of Mathematics and Computer Science University of Paderborn Germany

The 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 the 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 one 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.

关键词： Large-scale systems Network servers Streaming media content management Spine Bandwidth Bit rate Mathematics Computer science Large scale integration

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Query processing issues in image(multimedia) databases

Query processing issues in image(multimedia) databases

引用

15th International conference on Date Engineering

作者： Nepal, S Ramakrishna, MV RMIT Univ Dept Comp Sci Melbourne Vic 3001 Australia

ISBN: (纸本)0769500714

multimedia databases have attracted academic and industrial interest, and systems such as QBIC (content Based Image Retrieval system from IBM) have been released. Such systems are essential to effectively and efficiently use the existing large collections of image data in the modem computing environment. The aim of such systems is to enable retrieval of images based on their contents. This problem has brought together the (decades old) database and image processing communities. As parr of our research in this area, we are building a prototype CBIR system called CHITRA. This uses a four level data model, and we have defined a Fuzzy Object Query Language(FOQL)for this system. This system enables retrieval based on high level concepts, such as "retrieve images of MOUNTAINS", "retrieve images of MOUNTAINS and SUNSET". A problem faced in this system is processing of complex queries such as "retrieve all images that have similar color histogram AND similar texture to the given example image". Such problems have attracted research attention in recent times, notably by Fagin, Chaudhury and Gravano. Fagin has given an algorithm for processing such queries and provided a probabilistic upper bound for the complexity of the algorithm (which has been implemented in IBM's Garlic project). In this paper we provide theoretical (probabilistic) analysis of the expected cost of this algorithm. We propose a new multi-step query processing algorithm and prove that it performs better than Fagin's algorithm in all cases. Our algorithm requires fewer database accesses. We have evaluated both algorithms against an image database of 1000 images on our CHITRA system. We have used color histogram and Gabor texture features. Our analysis presented and the reported experimental results validate our algorithm (which has significant performance improvement).

关键词： Query languages

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SIGMOD/PODS 1999 - Proceedings of the 1999 ACM SIGMOD International conference on Management of Data and Symposium on Principles of Database systems

SIGMOD/PODS 1999 - Proceedings of the 1999 ACM SIGMOD Intern...

引用

1999 ACM SIGMOD International conference on Management of Data and Symposium on Principles of Database systems, SIGMOD/PODS 1999

ISBN: (纸本)9781581130843

The proceedings contain 83 papers. The topics discussed include: integration of spatial join algorithms for processing multiple inputs;selectivity estimation in spatial databases;efficient concurrency control in multidimensional access methods;snakes and sandwiches: optimal clustering strategies for a data warehouse;optics: ordering points to identify the clustering structure;fast algorithms for projected clustering;logical logging to extend recovery to new domains;update propagation protocols for replicated databases;belief reasoning in MLS deductive databases;a multimedia presentation algebra;and optimization of constrained frequent set queries with 2-variable constraints.

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6th International Workshop on Interactive Distributed multimedia systems and Telecommunication Services, IDMS 1999

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6th International Workshop on Interactive Distributed multimedia systems and Telecommunication Services, IDMS 1999

ISBN: (纸本)3540665951

The proceedings contain 31 papers. The special focus in this conference is on Network QoS and Application QoS. The topics include: Hardware acceleration inside a differentiated services access node;efficient signalling for multimedia in the internet;QoS-aware active gateway for multimedia communication;a study of the impact of network loss and burst size on video streaming quality and acceptability;transport of MPEG-2 video in a routed IP network;specification and realization of the QoS required by a distributed interactive simulation application in a new generation internet;a multicasting scheme using multiple MCSs in ATM networks;a platform for the study of reliable multicasting extensions to CORBA event service;telephone users meeting the MBone;network-diffused media scaling for multimedia content services;extended package-segment model and adaptable applications;tailoring protocols for dynamic network conditions and user requirements;design of an integrated environment for adaptive multimedia document presentation through real time monitoring;authoring of teletext applications for digital television broadcast;middleware support for multimedia collaborative applications over the web;a conversational interface for interactive television;a video compression algorithm for ATM networks with ABR service, using visual criteria;content-fragile watermarking based on content-based digital signatures and new structures for the next generation of IDMS.

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