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检索条件"任意字段=Multimedia Content Access: Algorithms and Systems"

共 204 条记录，以下是181-190 订阅

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MPEG-4 very low bit rate video

MPEG-4 very low bit rate video

引用

IEEE International Symposium on Circuits and systems (ISCAS)

作者： T. Sikora Heinrich-Hertz-Institute Berlin GmbH Berlin Germany

The MPEG video group is currently developing the so-called MPEG-4 video coding standard, targeted for future interactive multimedia video communications calling for content-based functionalities, universal access in error prone environments and high coding efficiency. Besides the provisions for content-based functionalities the MPEG-4 video standard will assist the efficient storage and transmission of very low bit rate video in error prone environments. This paper outlines the techniques that are currently being investigated by MPEG-4 to provide universal accessibility of video at very low bit rates and discusses the scope of some of the promising techniques under discussion.

关键词： MPEG 4 Standard Bit rate Video coding Transform coding multimedia communication Testing Standards development Video compression Virtual manufacturing Iterative algorithms

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An HMM-based approach to humming transcription

An HMM-based approach to humming transcription

引用

IEEE International Conference on multimedia and Expo (ICME)

作者： Hsuan-Huei Shih S.S. Narayanan C.-C.J. Kuo Integrated Media Systems Center and Department of Electrical Engineering University of Southern California Los Angeles CA USA

Providing natural and efficient access to the fast growing multimedia information, accommodating a variety of user skills and preferences, is a critical aspect of content-based information mining. Query by humming provides a natural means for content-based retrieval from music databases. A statistical pattern recognition approach for recognizing hummed or sung melodies is reported in this paper. Being data-driven, the proposed system aims at providing a robust front-end especially for dealing with variability in user's productions. The segment of a note in the humming waveform is modeled by a hidden Markov model (HMM) while data features such as pitch measures are modeled by Gaussian mixture models (GMM). Preliminary real-time recognition experiments are carried out based on humming data obtained from eight users and an overall correct recognition rate of around 80% is demonstrated.

关键词： Hidden Markov models Humans Decoding Music information retrieval content based retrieval Pattern recognition Robustness multimedia databases Signal processing algorithms Frequency

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Adaptive filtering for delivering multimedia services in W-CDMA cellular networks using genetic algorithms

Adaptive filtering for delivering multimedia services in W-C...

引用

International Conference on Wireless Networks, Communications and Mobile Computing

作者： F. De Angelis I. Habib City College City University of New York USA

This paper presents an adaptive filtering algorithm for the delivery of multimedia content with different quality of service (QoS) requirements in time-varying wideband code-division multiple access (W-CDMA) cellular networks. The algorithm objective is to guarantee levels of quality for two different user defined profiles (premium, or economy), while attempting to maximize the allocation of the radio channel bandwidth and maintaining the QoS requirements of downloaded traffic flows (audio, video, and data). Our proposed solution is based upon utilizing genetic algorithms (GAs) to solve a multi-objective function that selects, during a control period, the bit rates and formats for the media codecs of downloaded traffic flows and assigns the air interface channel rate and power to each user, subject to different constraints. To show the performance of the algorithm, W-CDMA systems with and without filtering capabilities are compared.

关键词： Adaptive filters Multiaccess communication Land mobile radio cellular systems Genetic algorithms Quality of service Filtering algorithms Wideband Bandwidth Communication system traffic control Bit rate

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Static and dynamic mapping of media assets on a network of distributed multimedia information servers

Static and dynamic mapping of media assets on a network of d...

引用

International Conference on Distributed Computing systems

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

This paper presents principles and algorithms for the management of a network of media servers. Such a server network allows the online delivery of broadband multimedia data, e.g. audio and video streams, to a large number of widely distributed clients. Thus, the implementation of large scale distributed broadband media information services is possible if such networks can be handled efficiently. In the paper two new combinatorial optimization problems are defined that have to be solved for an efficient management of the distributed media servers connected by a high-bandwidth communication network. The algorithms consider the case of a static mapping of media assets onto the server network as well as the dynamic migration of media assets on such a network. The first scenario is used in the case that all media assets are loaded for the first time onto the server network. The second scenario is applied dynamically during run-time of an information service taking the varying user access pattern and changing media content of the server network into account. In this paper the algorithms are presented and their efficiency is demonstrated using some benchmark instances. The algorithms are part of a larger distributed system that allows the management of a network of distributed media servers. The principles of this system are presented as well as some applications that have been developed and are supported by this distributed server management system (DSMS).

关键词： Network servers Streaming media Bandwidth Mathematics Computer science Reactive power Large-scale systems multimedia systems Information systems Graphics

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A hybrid metaheuristic approach to optimize the content transmission in multimedia systems

A hybrid metaheuristic approach to optimize the content tran...

引用

International Conference on Informatics in Control, Automation and Robotics (ICINCO)

作者： Arthur T. Gómez Luan C. Nesi Marcio G. Martins Leonardo D. Chiwiacowsky Master Program on Applied Computing University of the Sinos Valley São Leopoldo/RS Brazil

The advent of the digital television in Brazil has allowed users to access interactive channels. Once interactive channels are available, the users are able to find multimedia content such as movies and breaking news programs, to send and/or receive emails, to access interactive applications and also other contents. In this context, a high demand of requests from users is expected. Therefore, from the content provider's point of view, the determination of transmission parameters is needed in order to ensure the best quality of transmission to every user. The aforementioned identification problem is modelled as an optimization problem and a solution procedure based on metaheuristic techniques is proposed. Genetic Algorithm and Tabu Search metaheuristics are employed separately and coupled in a hybrid scheme to define the best transmission policy, optimizing the transmission parameters, such as audio and video transmission rates. Based on the experimental results, the hybrid algorithm has produced better solutions which meet the quality requirements.

关键词： Genetic algorithms Optimization Mathematical model multimedia communication Bandwidth Digital TV Servers

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Dynamic QoE optimisation for streaming content in large-scale future networks

Dynamic QoE optimisation for streaming content in large-scal...

引用

IFIP/IEEE International Symposium on Integrated Network Management

作者： Jeroen Famaey Bart De Vleeschauwer Tim Wauters Filip De Turck Bart Dhoedt Piet Demeester Department of Information Technology (INTEC) Ghent University IBBT Ghent Belgium

multimedia content sharing services, such as YouTube, usually offer only low quality video streams. Additionally, it is expected the popularity of these services will increase even further in the future. Therefore, current streaming- content delivery architectures, with centralised searching and management components, might not be able to keep up with the ever-growing user bases. In this paper, we propose a scalable and fully distributed end- to-end architecture for delivering streaming multimedia content. Additionally, we designed several algorithms that allow content servers to intelligently adapt content quality to the available access-link bandwidth and server resources. In this way, the service can improve quality of experience, by offering higher bit-rates at times of low load, while still being able to satisfy as many content requests as possible when the load increases. In depth simulations were performed to validate and evaluate these algorithms. The results show that the proposed platform is capable of increasing delivered stream quality and accepted content requests in various large-scale scenarios.

关键词： Large-scale systems Streaming media Web server Network servers Bandwidth Protocols Routing Video sharing YouTube Performance evaluation

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Time split linear quadtree for indexing image databases

Time split linear quadtree for indexing image databases

引用

IEEE International Conference on Image Processing

作者： T. Tzouramanis M. Vassilakopoulos Y. Manolopoulos Lab of Data Engineering Department of Informatics Aristotle University of Thessaloniki Thessaloniki Greece

The time split B-tree (TSBT) is modified for indexing a database of evolving binary images. This is accomplished by embedding ideas from linear region quadtrees that make the TSBT able to support spatio-temporal query processing. To improve query performance, additional pointers are added to the leaf-nodes of the TSBT. The resulting access method is called time split linear quadtree (TSLQ). algorithms for processing five spatio-temporal queries have been adapted to the new structure. Such queries appear in multimedia systems, or geographical information systems (GIS), when searched by content. The TSLQ was implemented and results of extensive experiments on query time performance are presented, indicating that the proposed algorithmic approaches outbalance respective straightforward algorithms. The region data sets used in the experiments were real images of meteorological satellite views and synthetic raster images.

关键词： Indexing Image databases multimedia systems Design automation Pixel Data engineering Informatics Information systems Meteorology Satellites

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Real-time content-based processing of multicast video

Real-time content-based processing of multicast video

引用

Asilomar Conference on Signals, systems & Computers

作者： Wensheng Zhou A. Vellaikal Ye Shen J.C.-C. Kuo Information Sciences Lab HRL Laboratories LLC Malibu CA USA Integrated Media System Center Department of Electrical Engineering-Systems University of Southern California Los Angeles CA USA

The access of high bandwidth multimedia data is generally limited to the network due to the limited network resources, inefficient indexing mechanism and less of semantic interpretations. Currently, most content-based video content representation involves the segmentation and indexing of video based on scene change and camera/object motion, and such research generally performs off-line video processing. Little research has been done on on-line video processing, which is crucial in video communication applications such as video conferencing, video multicasting and on-line video browsing and retrieval. This research investigates real-time content-based processing of multicast video over the Internet. New on-line video feature extraction schemes, such as scene change detection, on-line key frame classification, are considered to meet the requirement of real-time video multicasting filtering based on the user's profile over the Internet. The annotation and features extracted from a multicast videoconference bitstream by the on-line video content analysis proxies, which are using the proposed video processing algorithms, are output to a separate metadata channel for the further assistance of semantic multicasting of video content. The performance of the proposed algorithms is also demonstrated.

关键词： Videoconference Indexing Layout Internet Feature extraction Multicast algorithms Bandwidth Cameras Information filtering Information filters

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Navigational Indices and content Interlinkage on the Fly

Navigational Indices and Content Interlinkage on the Fly

引用

IEEE International Symposium on multimedia

作者： Peter Ziewer Institut fur Informatik Technische Universitat Munchen Germany

ISBN: (纸本)0769527469;9780769527468

Lecture recording provides learning material for local and distance education. The TeleTeachingTool uses the most flexible screen recording technique to capture virtually any material displayed during a presentation. With its built-in annotation system teachers can add freehand notes and emphasize important parts. Unlike other screen recorders, our implementation offers slide-hosed navigation, full text search and annotated scripts, which is obtained by automated post-production. This paper presents how to achieve live access to any slide with corresponding annotations created earlier during the presentation, although annotations are not associated with slides. For this the post-processing algorithms must be adapted to work on the fly while the presentation is still in progress and an interlinkage between slides and annotations must be achieved

关键词： Navigation Application software Animation Audio recording Video recording Distance learning Performance analysis multimedia communication Digital multimedia broadcasting Operating systems

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QoS-Oriented content Delivery in E-Learning systems

QoS-Oriented Content Delivery in E-Learning Systems

引用

2009 IEEE International Symposium on IT in Medicine & Education(ITME2009)

作者： Shihong Xu and Hong Shen School of Computer Science,The University of Adelaide,SA 5005,Australia

QoS-oriented content delivery is an important component in en-learning *** this paper,we study the object placement problem in the parallel-access context for QoS-oriented content *** problem is formulated in terms of bandwidth maximization and further proved to be equivalent to the Fault Tolerant Facility Location Problem (FTFL).In this problem the bandwidth that violates the triangle inequality is measured by a cost function which forms a metric when the shortest-path routing is *** there have been efficient UFL algorithms with good performance guarantees,the challenge of the FTFL Problem arises due to the conflict of its connectivity requirement (multiple distinct connections) and cost minimization (which leads to identical connections with the minimum cost).We investigate possible solutions for addressing this conflict after giving an overview of the existing *** of the problem to the context of QoE-aware multimedia delivery which has important applications in elearning systems is also discussed.

关键词： QoS-Oriented content Delivery in E-Learning systems

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