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Conference on multimedia Storage and Archiving systems ii

作者： Milanese, R Deguillaume, F JacotDescombes, A Univ. of Geneva (Switzerland)

ISBN: (纸本)0819426628

We address the problem of automatically extracting visual indexes from videos, in order to provide sophisticated access methods to the contents of a video server. We focus on two tasks, namely the decomposition of a video clip into uniform segments (shots), and the characterization of each shot by camera motion parameters. For the first task we use a Bayesian classification approach to detecting scene cuts by analyzing motion vectors. For the second task a least-squares fitting procedure determines the pan/tilt/zoom camera parameters. In order to guarantee the highest processing speed, all techniques process and analyze directly MPEG-1 motion vectors, without need for video decompression. Experimental results are reported for a database of news video clips.

关键词： shot detection camera motion video archival content-based retrieval Bayesian classification MPEG

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Evaluation of a monitoring-based architecture for delivery of high quality multimedia content

Evaluation of a monitoring-based architecture for delivery o...

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10th IEEE Symposium on Computers and Communications

作者： Coppens, J Wauters, T De Turck, F Dhoedt, B Demeester, P Univ Ghent Dept Informat Technol B-9000 Ghent Belgium

ISBN: (纸本)0769523730

Currently, a lot of research has been devoted to (i) content distribution, (ii) traffic engineering, (iii) network monitoring and (iv) service enabling platforms. However, the integration of these four individual concepts in a single platform has not yet been studied in enough detail. In this paper we present an architecture for such a robust content delivery service. The combination of both distributed replication of videos and multi-source traffic engineering tackles specific problems such as congested network parts, overloaded servers and the occurrence of flash crowds. Contrary to most existing systems, the content placement and retrieval algorithms in the presented CDN obtain precise network state information from an integrated monitoring system, allowing even a higher efficiency. To validate the performance of the CDN, an exact placement ILP formulation and various RPA heuristics are implemented and simulated.

关键词： multimedia systems

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SYSTEM SUPPORT FOR PERV ASIVE multimedia systems

SYSTEM SUPPORT FOR PERV ASIVE MULTIMEDIA SYSTEMS

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作者： XIAOTAO LIU University of Massachusetts Amherst

学位级别：博士

The proliferation of multimedia-capable mobile devices, such as laptops, personal digi- tal assistants (PDA), and cellular telephones, has lend to an explosive increase of multime- dia contents. With the increasing capacities of disk storage, this trend has encouraged users to create ever-larger personal digital libraries of audios, pictures, and videos. The preva- lence of small and mobile devices such as sensors and RFID tags is expected to create an ubiquitous computing environment. This ubiquitous environment can provide us pervasive locationing and identification services, and further can create sensor data streams encoding object's location and identity which are the context of media capture. The concurrence of these two trends enable a new set of multimedia systems that we refer to as Pervasive multimedia systems. Pervasive multimedia systems enable users to create, access and navigate large volumes of multimedia content on a variety of personal mobile devices. Designing these pervasive multimedia systems face three major challenges: (i) achiev- ing energy efficiency for the battery-powered mobile devices; (ii) searching and retrieving media content in a fast and human-friendly manner; and (iii) identifying and locating in scalable and maintainable fashions. In this thesis, We propose techniques that provide system support for pervasive multimedia systems to address these challenges. Due to the power constraints, battery-powered mobile devices impose requirements of energy efficiency. On the other hand, the real-time nature of multimedia applications makes it challenging to trade off application's performance with energy savings. To achieve energy efficiency without sacrificing application's quality-of-service (QoS), We have de- veloped power management techniques using application domain-specific knowledge and time-series-based models. Our approaches can reduce the power consumption of mobile devices significantly, while at the same time still meet the QoS r

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ECAS-ML: Edge Computing Assisted Adaptation Scheme with Machine Learning for HTTP Adaptive Streaming 28th

ECAS-ML: Edge Computing Assisted Adaptation Scheme with Mach...

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28th International Conference on multimedia Modeling (MMM)

作者： Aguilar-Armijo, Jesus Cetinkaya, Ekrem Timmerer, Christian Hellwagner, Hermann Alpen Adria Univ Klagenfurt Inst Informat Technol Christian Doppler Lab ATHENA Klagenfurt Austria

ISBN: (纸本)9783030983550;9783030983543

As the video streaming traffic in mobile networks is increasing, improving the content delivery process becomes crucial, e.g., by utilizing edge computing support. At an edge node, we can deploy adaptive bitrate (ABR) algorithms with a better understanding of network behavior and access to radio and player metrics. In this work, we present ECAS-ML, Edge Assisted Adaptation Scheme for HTTP Adaptive Streaming with Machine Learning. ECAS-ML focuses on managing the tradeoff among bitrate, segment switches and stalls to achieve a higher quality of experience (QoE). For that purpose, we use machine learning techniques to analyze radio throughput traces and predict the best parameters of our algorithm to achieve better performance. The results show that ECAS-ML outperforms other client-based and edge-based ABR algorithms.

关键词： HTTP Adaptive Streaming Edge computing content delivery Network-assisted video streaming Quality of experience Machine learning

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Advances in multimedia Information systems - 11th International Workshop, MIS 2005, Proceedings

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11th International Workshop on Advances in multimedia Information systems, MIS 2005

ISBN: (纸本)3540287922

The proceedings contain 18 papers. The topics discussed include: early data tailoring for ubiquitous information access in highly dynamic environments;one to many 3D face recognition enhanced through k-d-Tree based spatial access;a rule based approach to message borad topics classification;an indexing approach for representing multimedia objects in high-dimensional spaces based on expectation maximization algorithms;the MX formalism for semantic web compatible representation of music metadata;icon language-based auxiliary communication system interface for language disorders;intelligent delivery of multimedia content in a device aware ubiquitous environments;and harmonic block windows through harmonic windows scheduling.

关键词： multimedia systems

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Fundamental tradeoffs in distributed algorithms for rate adaptive multimedia streams

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6th International IFIP-TC 6 Networking Conference

作者： Veeraraghavan, Vilas Weber, Steven Drexel Univ Dept Elect & Comp Engn Philadelphia PA 19104 USA

ISBN: (纸本)97830540726050

Rate adaptive multimedia streams are streaming media connections where the encoding rate is adjusted dynamically (with corresponding changes in media content resolution) in response to changing levels of congestion along the connection. The field of optimization based congestion control has yielded sophisticated distributed algorithms for resource allocation among competing elastic streams. In this work we study the fundamental tradeoffs for a class of optimization based distributed algorithms for rate adaptive streams, building on our earlier work. We focus on three tradeoffs: i) the tradeoff between maximizing client average quality of service (QoS) and client fairness, ii) the tradeoff between granularity of control (both temporal and spatial) and QoS, and iii) the tradeoff between maximizing the received volume and minimizing the fluctuations in received rate. These tradeoffs are illustrated through extensive simulation results using ns-2.

关键词： Quality of service

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Understanding the Impact of Wi-Fi Configuration on Volumetric Video Streaming Applications

Understanding the Impact of Wi-Fi Configuration on Volumetri...

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SIGCOMM Workshop on Emerging multimedia systems (EMS)

作者： Kulkarni, Umakant Diab, Khaled Aggarwal, Shivang Cao, Lianjie Ahmed, Faraz Sharma, Puneet Fahmy, Sonia Hewlett Packard Labs Palo Alto CA 94304 USA Purdue Univ W Lafayette IN USA

ISBN: (纸本)9798400703034

Emerging multimedia applications often use a wireless LAN (Wi-Fi) infrastructure to stream content. These Wi-Fi deployments vary vastly in terms of their system configurations. In this paper, we take a step toward characterizing the Quality of Experience (QoE) of volumetric video streaming over an enterprise-grade Wi-Fi network to: (i) understand the impact of Wi-Fi control parameters on user QoE, (ii) analyze the relation between Quality of Service (QoS) metrics of Wi-Fi networks and application QoE, and (iii) compare the QoE of volumetric video streaming to traditional 2D video applications. We find that Wi-Fi configuration parameters such as channel width, radio interface, access category, and priority queues are important for optimizing Wi-Fi networks for streaming immersive videos.

关键词： Wi-Fi Volumetric Video Streaming Quality of Service Quality of Experience access Category Channel Width Radio Interface Priority Queues

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Delivering MPEG-4 Based Audio-Visual Services (multimedia systems and Applications Volume 18) 1

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2000年

作者： Hari Kalva

ISBN: (纸本)0792372557;9780792372554;9780306469923

From the Publisher: Delivering MPEG-4 Based Audio-Visual Services investigates the different aspects of end-to-end multimedia services; content creation, server and service provider, network, and the end-user terminal. Part I provides a comprehensive introduction to digital video communications, MPEG standards, and technologies, and deals with system level issues including standardization and interoperability, user interaction, and the design of a distributed video server. Part ii investigates the systems in the context of object-based multimedia services and presents a design for an object-based audio-visual terminal, some of these features having been adopted by the MPEG-4 systems specification. The book goes on to study the requirements for a file format to represent object-based audio-visual content and the design of one such format. The design introduces new concepts such as direct streaming that are essential for scalable servers. The final part of the book examines the delivery of object-based multimedia presentations and gives optimal algorithms for multiplex-scheduling of object-based audio-visual presentations, showing that the audio-visual object scheduling problem is NP-complete in the strong sense. The problem of scheduling audio-visual objects is similar to the problem of sequencing jobs on a single machine. The book compares these problems and adapts job-sequencing results to audio-visual object scheduling, and provides optimal algorithms for scheduling presentations under resource constraints, such as bandwidth (network constraints) and buffer (terminal constraints). In addition, the book presents algorithms that minimize the resources required for scheduling presentations and the auxiliary capacity required to support interactivity in object-based audio-visual presentations. Delivering MPEG-4 Based Audio-Visual Services is essential reading for researchers and practitioners in the areas of multimedia systems engineering and multimedia computi

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content-Aware Cognitive Interference Control for Urban IoT systems

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IEEE TRANSACTIONS ON COGNITIVE COMMUNICATIONS AND NETWORKING 2018年第3期4卷 500-512页

作者： Baidya, Sabur Levorato, Marco Univ Calif Irvine Donald Bren Sch Informat & Comp Sci Irvine CA 92617 USA

A novel cognitive interference control framework for heterogeneous local access networks supporting computing and data processing in urban Internet of Things (IoT) systems is presented. The notion of cognitive content-aware interference control is introduced, where the transmission pattern of cognitive nodes is dynamically adapted to the state of "protected" IoT data streams. The state describes the performance degradation that interference would cause to algorithms processing the data if the cognitive nodes chose to transmit in the corresponding time period. The framework is instantiated for a case-study scenario, where device-to-device (D2D) and long-term evolution communications coexist on the same channel resource. A city-monitoring application is considered, where the state captures the type of frames within a multimedia video stream processed at the edge of the network to detect and track objects. Numerical results show that the proposed cognitive transmission strategy enables a significant throughput increase of local D2D communications for a target accuracy of the monitoring application.

关键词： Device-to-device communications LTE urban IoT video streaming spectrum sharing

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Secure Hybrid In-Network Caching in a hybrid satellite-terrestrial Environment: the SHINE project 13

Secure Hybrid In-Network Caching in a hybrid satellite-terre...

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13th IEEE International Symposium on Broadband multimedia systems and Broadcasting (BMSB)

作者： Romano, Simon Pietro Roseti, Cesare Univ Napoli Federico II DIETI Naples Italy Univ Roma Tor Vergata Dept Elect Engn Rome Italy

ISBN: (纸本)9781538647295

This paper provides a high-level overview of the SHINE project, whose focus is the design and implementation of an end-to-end secure infrastructure for the delivery of collaborative multimedia services over integrated satellite-terrestrial networks. The project extends to satellite-enabled scenarios the outstanding solutions available for terrestrial communication networks, while also designing innovative mechanisms for the protection from unauthorized access to content-related data, as well as for the secure distribution of real-time multimedia information across hybrid channels leveraging both the unicast and the multicast communication paradigm. The original contribution of the paper is the analysis of satellite architectures and configurations tailored to efficiently support the SHINE solution, together with the presentation of the testbed envisaged to proof the SHINE concept.

关键词： 5G Future Internet Network Coding MPEG-DASH WebRTC

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