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3rd International Conference on Mobile systems, Applications and Services (MobiSys 2005)

作者： Wei, B Renger, B Chen, YF Jana, R Huang, H Begeja, L Gibbon, D Liu, Z Shahraray, B AT&T Labs Res Florham Pk NJ 07932 USA

ISBN: (纸本)1931971315

We present a system for automatic monitoring and timely dissemination of multimedia information to a range of mobile information appliances based on each user's interest profile. multimedia processing algorithms detect and isolate relevant video segments from over twenty television broadcast programs based on a collection of words and phrases specified by the user. content repurposing techniques are then used to convert the information into a form that is suitable for delivery to the user's mobile devices. Alerts are sent using a number of application messaging and network access protocols including email, short message service (SMS), multimedia messaging service (MMS), voice, session initiation protocol (SIP), fax, and pager protocols. The system is evaluated with respect to performance and user experiences. The MediaAlert system provides an effective and low-cost solution for the timely generation of alerts containing personal, business, and security information.

关键词： mobile devices multimedia processing content repurposing content adaptation service platform news monitoring automatic speech recognition (ASR) multimedia messaging alerting notification

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Addressing user expectations in mobile content delivery

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MOBILE INFORMATION systems 2007年第3-4期3卷 153-164页

作者： Agboma, Florence Liotta, Antonio Univ Essex Dept Elect Syst Engn Colchester CO4 3SQ Essex England

multimedia services like television programs and live streaming of mobile videos can he delivered to mobile terminals via different access technologies. The question is - how do users perceive such services oil mobile terminals? The objective Of this study is to find the correlation between video quality thresholds and the user COMM. Our Study reveals the thresholds of user's quality of experience (QoE) in a mobile environment by using different categories of content types, in relation to different access technologies and terminal capability. The mobile terminals used are: - (i) 3G Mobile Phone (ii) Personal Digital Assistant (PDA) and (iii) Laptop. We argue that quality of service (QoS) management should be driven by (lie user perception of quality rather than resulting from raw engineering parameters such as latency, jitter, bandwidth etc. Our results will be of,real interest to network operators. service providers, terminal Manufacturers, and researchers working in the area of quality of service management.

关键词： QoS QoE management video quality thresholds mobile terminals

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Knowledge-based media adaptation

Knowledge-based media adaptation

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Conference on Internet multimedia Management systems V

作者： Leopold, K Jannach, D Hellwagner, H Univ Klagenfurt Dept Informat Technol Klagenfurt Austria

ISBN: (纸本)0819455547

This paper introduces the principal approach and describes the basic architecture and current implementation of the knowledge-based multimedia adaptation framework we are currently developing. The framework can be used in Universal multimedia access scenarios, where multimedia content has to be adapted to specific usage environment parameters (network and client device capabilities, user preferences). Using knowledge-based techniques (state-space planning), the framework automatically computes an adaptation plan, i.e., a sequence of media conversion operations, to transform the multimedia resources to meet the client's requirements or constraints. The system takes as input standards-compliant descriptions of the content (using MPEG-7 metadata) and of the target usage environment (using MPEG-21 Digital Item Adaptation metadata) to derive start and goal states for the planning process, respectively. Furthermore, declarative descriptions of the conversion operations (such as available via software library functions) enable existing adaptation algorithms to be invoked without requiring programming effort. A running example in the paper illustrates the descriptors and techniques employed by the knowledge-based media adaptation system.

关键词： multimedia adaptation adaptation decision taking metadata MPEG-7 MPEG-21

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Scalable Coding of 360-degree Video for Streaming Adaptation at 5G Network Edges 15

Scalable Coding of 360-degree Video for Streaming Adaptation...

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15th IEEE International Symposium on Broadband multimedia systems and Broadcasting (BMSB)

作者： Carreira, J. de Faria, Sergio M. M. Tavora, Luis M. N. Navarro, Antonio Assuncao, Pedro A. A. Inst Telecomunicacoes Lisbon Portugal Polytech Leiria ESTG Leiria Portugal Univ Aveiro Aveiro Portugal

ISBN: (纸本)9781728157849

YY The huge amount of data that is necessary to capture the full field-of-view (FoV) in omnidirectional video, i.e., 360 degrees, imposes the use of highly efficient compressed formats as well as adaptive broadcast and streaming mechanisms, such as those foreseen for 5G networks. To cope with the demanding requirements of 360 degrees video streaming over 5G networks, this work proposes a scalable 360 degrees video coding architecture, by enabling adaptation through the Multi-access Edge Computing (MEC) server in two different domains of the spherical visual content, namely spatial resolution and FoV. In the proposed architecture two-layers are encoded from the input 360 degrees video content: (i) the base-layer (BL), encoding each 360 degrees image as a whole, at a lower spatial resolution;(ii) the enhancement-layer (EL) encoding each spherical image as a set of multiple FoVs with higher spatial resolution. Such arrangement enables flexible stream adaptation for the smart decision algorithms to be implemented at the MEC server, enabling significant reduction of the overall bit rate through the radio interface. The simulation results show that the proposed scalable coding scheme allows a great deal of bit rate savings across the 5G network, achieving 36% of bit rate saving, on average, for a 90 degrees FoV in comparison with conventional single-layer coding.

关键词： Scalable video coding & content adaptation Future broadcasting services

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Three-domain Image Representation for Personal Photo Album Management

Three-domain Image Representation for Personal Photo Album M...

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Conference on Imaging and Printing in a Web 2.0 World;and multimedia content access - algorithms and systems IV

作者： Ardizzone, E. La Cascia, M. Morana, M. Vella, F. Univ Palermo Dipartimento Ingn Informat Viale Sci Ed 6 Palermo Italy Consiglio Nazl Rice Ist Calcolo & Reti Alte Prestaz Palermo Italy

ISBN: (纸本)9780819479334

In this paper we present a novel approach for personal photo album management. Pictures are analyzed and described in three representation spaces, namely, faces, background and time of capture. Faces are automatically detected and rectified using a probabilistic feature extraction technique. Face representation is then produced by computing PCA (Principal Component Analysis). Backgrounds are represented with low-level visual features based on RGB histogram and Gabor filter bank. Temporal data is obtained through the extraction of EXIF (Exchangeable image file format) data. Each image in the collection is then automatically organized using a mean-shift clustering technique. While many systems manage faces and typically allow queries about them we use a common approach to manage multiple aspects, that is, queries regarding people, time and background are dealt with in a homogenous way. We report experimental results on a realistic set, i.e., a personal photo album, of about 2000 images where automatic detection and rectification of faces lead to approximately 800 faces. Significance of clustering has been evaluated and results are very interesting.

关键词： CBIR - content Based Image Retrieval automatic image annotation personal photo album management

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Real-Time Load Optimization for multimedia delivery content over Heterogeneuos Wireless Network using a MEW approach 12

Real-Time Load Optimization for multimedia delivery content ...

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12th IEEE International Symposium on Broadband multimedia systems and Broadcasting (BMSB)

作者： Desogus, Cristina Anedda, Matteo Murroni, Maurizio Univ Cagliari Dept Elect & Elect Engn DIEE Piazza Armi I-09123 Cagliari Italy

ISBN: (纸本)9781509049370

The significant increment in the number of users that need broadband multimedia system, relative radio resources, and the evolution of the devices has encouraged to search for different methods to manage heterogeneous wireless networks. One solution to this problem is to make traffic balancing on heterogeneous networks, so that none of the available networks for a given user will be saturated avoiding performance decay. This paper proposes a novel Multiplicative Exponential Weighting (MEW) approach that manages the access network selection. MEW combines several inputs such as power of the received signal, throughput, packet delay, cost-per-user, the requested type of traffic, and type of device. The obtained results have shown an improvement of 15% in average PSNR, and 20% in terms of delay and throughput, compared to the algorithms presented in the literature.

关键词： Congestion control Performance evaluation Traffic and performance monitoring Networking and QoS Propagation and coverage

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Using category-based collaborative filtering in the Active WebMuseum

Using category-based collaborative filtering in the Active W...

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1st IEEE International Conference on multimedia and Expo (ICME2000)

作者： Kohrs, A Merialdo, B Inst EURECOM Dept Multimedia Commun F-06904 Sophia Antipolis France

ISBN: (纸本)0780365364

Collaborative filtering is an important technology for creating user-adapting Web sites. In general the efforts of improving filtering algorithms and using the predictions for the presentation of filtered objects are decoupled. Therefore, common measures (or metrics) for evaluating collaborative filtering (recommender) systems focus mainly on the prediction algorithm. It is hard to relate the classic measurements to actual user satisfaction because of the way the user interacts with the recommendations, determined by their representation, influences the benefits for the user. We propose an abstract access paradigm, which can be applied to the design of filtering systems, and at the same time formalizes the access to filtering results via multi-corridors (based on content-based categories). This leads to new measures which better relate to the user satisfaction. We use these measures to evaluate the use of various kinds of multi-corridors for our prototype user-adapting Web site the: Active WebMuseum.

关键词： Computer supported cooperative work

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Proceedings of SPIE: Internet multimedia Management systems ii

Proceedings of SPIE: Internet Multimedia Management Systems ...

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Internet multimedia Management systems ii

This Volume 4519 of the conference proceedings contains 30 papers. Topics discussed include video segmentation, video content analysis and retrieval, semantics and knowledge representations, image analysis and retrieval, audio analysis and retrieval, video compression and delivery, video access and browsing, vide servers, video rate control and adaptation and video applications.

关键词： multimedia systems

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Mobile Internet over IP data broadcast 10

Mobile Internet over IP data broadcast

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10th International Conference on Telecommunications (ICT 2003)

作者： Paila, T Nokia Electr Ltd Nokia Grp Helsinki Finland

ISBN: (纸本)0780376617

When speaking of wireless and mobile Internet, we often assume that a bi-directional access network must be within reach. Usually we see GPRS, UMTS and wireless LANs as carriers supporting the Internet access service. This service consequently provides a basis for browsing and retrieving a wealth of digital multimedia content upon user request. However, there are alternative means to deliver digital content to mobile users. Indeed, general content and content formats are independent from various communication methods. In this paper we focus on an alternative content delivery method - content push over terrestrial IP data broadcasting. To give a concrete context for discussion we assume DVB-T as transmission technology. The unidirectional, wide-band, shared channel suits especially well delivery service that targets multiple end users on the move. Applied to mobile communications, IP data broadcasting proves to complement the traditional mobile Internet access service provided over bi-directional access systems. From the viewpoint of international standards developing organizations, we tackle the issues needed to establish a globally inter-operable IP datacast baseline as a service platform.

关键词： 3G mobile communication Bidirectional control Broadcasting content based retrieval Ground penetrating radar IP networks Mobile communication multimedia communication Web and internet services Wireless LAN

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The MPEG-4 video standard verification model

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IEEE TRANSACTIONS ON CIRCUITS AND systems FOR VIDEO TECHNOLOGY 1997年第1期7卷 19-31页

作者： Sikora, T Laboratory of Chromatography DEPg.Fac.Quimica Universidad Nacional Autonoma de Mexico Circuito interior Cd Universitaria/CP 04510 Mexico D.F.Mexico

The MPEG-4 standardization phase has the mandate to develop algorithms for audio-visual coding allowing for interactivity, high compression, and/or universal accessibility and portability of audio and video content. In addition to the conventional ''frame''-based functionalities of the MPEG-1 and MPEG-2 standards, the MPEG-4 video coding algorithm will also support access and manipulation of ''objects'' within video scenes. The January 1996 MPEG Video group meeting witnessed the definition of the first version of the MPEG-4 Video Verification Model-a milestone in the development of the MPEG-4 standard. The primary intent of the Video Verification Model is to provide a fully defined core video coding algorithm platform for the development of the standard. As such, the structure of the MPEG-4 Video Verification Model already gives some indication about the tools and algorithms that will be provided by the final MPEG-4 standard. The purpose of this paper is to describe the scope of the MPEG-4 Video standard and to outline the structure of the MPEG-4 Video Verification Model under development.

关键词： coding efficiency compression error robustness flexible coding functional coding manipulation MPEG MPEG-4 multimedia natural video object-based coding SNHC standardization synthetic video universal accessibility verification model video coding

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