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

共 2024 条记录，以下是121-130 订阅

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AN EVALUATION OF PIECE-PICKING algorithms FOR LAYERED content IN BITTORRENT-BASED PEER-TO-PEER systems

AN EVALUATION OF PIECE-PICKING ALGORITHMS FOR LAYERED CONTEN...

引用

IEEE International conference on multimedia and Expo (ICME)

作者： Eberhard, Michael Hellwagner, Hermann Timmerer, Christian Szkaliczki, Tibor Szobonya, Laszlo Alpen Adria Univ Klagenfurt ITEC MMC Klagenfurt Austria MTA SZTAKI eLearning Dept Klagenfurt Austria

ISBN: (纸本)9781612843490

In this paper the performance of layered piece-picking algorithms for Bittorrent-based peer-to-peer systems is evaluated and compared to traditional single layer solutions. In a Bittorrent-based peer-to-peer system, the piece-picking algorithm needs to ensure that the pieces of an audiovisual content are received in time to ensure smooth playback of the content. For layered content provided in multiple qualities, the task of the algorithm becomes more complex, as it has to consider the layer of the pieces to be fetched in addition to the deadline. Thus, the goal of the layered piece-picking algorithm is to ensure that the best possible quality under the given network conditions is received while the playback is not disturbed. To illustrate the advantages of such a layered piece-picking algorithm, its performance is evaluated and compared to a single layer piece-picking algorithm. The results show that layered piece-picking algorithms can significantly improve the quality in terms of peak signal-to-noise ratio.

关键词： Peer-to-Peer Layered content Piece-Picking Evaluation

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Intelligent content Retrieval using a Visual Vocabulary and Geometric Constraints

Intelligent Content Retrieval using a Visual Vocabulary and ...

引用

2010 IEEE World Congress on Computational Intelligence

作者： Spyrou, Evaggelos Kalantidis, Yannis Tolias, Giorgos Mylonas, Phivos Kollias, Stefanos Natl Tech Univ Athens Image Video & Multimedia Syst Lab Sch Elect & Comp Engn GR-15773 Athens Greece

ISBN: (纸本)9781424469208

During the last decades multimedia processing has emerged as an important technology to retrieve content based on similar data. Moreover, recent developments in the fields of high definition (HD) multimedia content and personal content collections (personal camcorders and digital still image cameras) tend to generate a huge volume of multimedia data everyday. Thus, the need for a meaningful, quick organization and access to generated content is now more than necessary;however, it still remains a rather difficult problem to be tackled both by humans and computers. In this paper we propose an intelligent extension of traditional image analysis methodologies towards more efficient digital content retrieval. The main idea is to extend local feature extraction methodologies by introducing additional geometrical constraints in the process. The proposed approach is tested and evaluated on a number of publicly available image datasets and results are very promising.

关键词： content-based retrieval digital content retrieval digital still image cameras feature extraction feature extraction method geometric constraint high definition multimedia content image retrieval intelligent content retrieval multimedia computing multimedia processing personal camcorders personal content collection visual vocabulary vocabulary

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Image quality assessment in multimedia applications

Image quality assessment in multimedia applications

引用

multimedia content access: algorithms and systems III

作者： Ciocca, G. Marini, F. Schettini, R. DISCo Dipartimento di Informatica Sistemistica e Comunicazione Universita Degli Studi di Milano-Bicocca Viale Sarca 336 20126 Milano Italy

In the framework of multimedia applications image quality may have different meanings and interpretations. In this paper, considering the quality of an image as the degree of adequacy to its function/goal within a specific application field, we provide an organized overview of image quality assessment methods by putting in evidence their applicability and limitations in different application domains. Three scenarios have been chosen representing three typical applications with different degree of constraints in their image workflow chains and requiring different image quality assessment methodologies. ©2009 SPIE-IS&T.

关键词： Image quality

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Heterogeneous associative cache for multimedia applications

Heterogeneous associative cache for multimedia applications

引用

IASTED European conference on Internet and multimedia systems and Applications (EuroIMSA)

作者： Xie Yuejian Zhang Youhui Wang Dongsheng Tsinghua Univ 4-305 FIT Bldg Beijing 100084 Peoples R China

ISBN: (纸本)9780889866522

The off-chip memory communication is often a critical part of a video processing system. Traditional cache usually behaves poor since some video algorithms such as H.264 motion compensation tend to access memory in an inefficient way. Based on the analysis of cache line fetch efficiency, we find out that more than 10% fetches are inefficient. In this paper, we propose a Heterogeneous Associative Cache (HA Cache) architecture, in which there is an additional special way with a smaller cache line size, special mapping strategy and replacement policy. This scheme can effectively reduce power, cache space, and bandwidth wasted on useless data. By adding a special way to the traditional 2-way set-associative cache (with 1/8 cache size increase), the HA Cache can save up to 10% memory access. In most cases, it is even better than doubling the traditional cache size.

关键词： heterogeneous cache H.264 motion compensation

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Novel Color Feature Representation and Matching Technique for content-based Image Retrieval

Novel Color Feature Representation and Matching Technique fo...

引用

International conference on multimedia Computing and systems

作者： Zhang, Zhenhua Li, Wenhui Lu, Yinan Jilin Univ Coll Comp Sci & Technol Changchun 130023 Peoples R China

ISBN: (纸本)9781424437566

Color features of an image are the most widely used features in content-based image retrieval (CBIR) [1][6] systems. Specifically histogram-based algorithms are considered to be effective for color image indexing. Color histogram [2] describes the global distribution of pixels of an image which is insensitive to variations in scale and easy to calculate. However, the high dimensionality of feature vectors results in high computation cost and space cost. In this paper, we mainly focus on color features and propose a novel method named Color Frequency Sequence Difference (CFSD) to express color images, which only has one numerical value in one color channel The CFSD is combined with information entropy to realize indexing. The novel approach is described in detail and compared with color histogram method presented in the literature. The experiment is finished and shows that the method proposed in this paper is effective and efficient

关键词： Image Retrieval Color Histogram content-based image retrieval (CBIR , Information Entropy

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Method of Design Public Key Infrastructure for Secure Audio Information Transmission in multimedia systems 15

Method of Design Public Key Infrastructure for Secure Audio ...

引用

15th International conference on Electrical Machines, Drives and Power systems (ELMA)

作者： Pleshkova, Snezhana Kinanev, Dimitar

ISBN: (纸本)9781509066919

The importance to protect from non-authorized access of audio information transmission in multimedia systems is very high. [1] There are a lot of methods and algorithms suitable for the general case to secure transmission of all kind of data, including video and audio as a part of the multimedia information [2] In this article is proposed a special methodological approach to design and implementation of Public Key Infrastructure (PKI) in order to secure the transmission of audio information and protect it from unauthorized access through encryption keeping its confidentiality and integrity.

关键词： audio security certificates pki encryption

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Augmented Reality and How to access Archived Media Art A Counterfactual Media Art Exhibition 20

Augmented Reality and How to Access Archived Media Art A Cou...

引用

20th International conference on Virtual systems and multimedia (VSMM)

作者： Reinhuber, Elke E. Nanyang Technol Univ Sch Art Design & Media Singapore Singapore

ISBN: (纸本)9781479972272

With an increasing number of site-specific interactive artworks, museums need to question - not only for future generations, but even more importantly, for current audiences how is it possible to access and preserve archived material. This practice-based research evaluates the possibilities and problems of Augmented Reality as a tool to reactivate archived material with an exemplary investigation at ZKM, Karlsruhe in 2013. During this research, I explored different methods for offering insight into a series of works in the publicly accessible foyer. In doing so, I encountered several difficulties but also benefits, which will be discussed in this paper. My analysis of the field yielded knowledge about the successful implementation of AR in different scenarios, which I can illustrate with some rewarding examples.

关键词： Augmented Reality Media Art Archive Museum Counterfactual Location-based Documentation ZKM

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Event-centric media management

Event-centric media management

引用

conference on multimedia content access - algorithms and systems II

作者： Scherp, Ansgar Agaram, Srikanih Jain, Ramesh OFFIS Inst Informat Technol D-26121 Oldenburg Germany Univ Calif Irvine Irvine CA 92697 USA

ISBN: (纸本)9780819469922

The management,of the vast amount of media assets captured at every day events such as meetings, birthday parties, vacation, and conferences has become an increasingly challenging problem. Today, most media management applications are media-centric. This means, they put the captured media assets into the center of the management. However, in recent years it has been proposed that events are a much better abstraction of human experience and thus provide a more appropriate means for managing media assets. Consequently, approaches that include events into their media management solution have been explored. However, they typically consider events only as some more metadata that can be extracted from the media assets. In addition, today's applications and approaches concentrate on particular problems such as event detection, tagging, sharing, classification, or clustering and are often focused on a single media type. In this paper, we argue for the benefits of an event-centric media management (EMMa) approach that-looks at the problem of media management holistically. Based on a generic event model, we specify a media event model for-the EMMa approach. The single -phases and processes of the EMMa approach are defined in a general process chain for-an event-centric media management, the EMMa cycle. This cycle follows the event concept throughout all phases and processes of the chain and-puts the concept of events in the center of the media management. Based on the media event model and EMMa cycle, we design a component-based architecture for the EMMa approach and conduct an implementation of the approach.

关键词： events event-centric media management event classification event clustering multimedia authoring

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The geovideoworld: New scenarios for accessing geographical video content

The geovideoworld: New scenarios for accessing geographical ...

引用

9th IASTED International conference on Internet and multimedia systems and Applications, IMSA 2005

作者： Crockford, Chris Agius, Harry Brunel University School of Information Systems Computing and Mathematics Uxbridge Middlesex UB8 3PH United Kingdom

ISBN: (纸本)0889865108

The acquisition of geographical video content is growing rapidly, raising issues of the best ways in which access to that content can be provided to the user. The easiest, and thus dominant, approach is to treat this content as regular video content and permit the user to access it via media-player-like control sets. However, we argue that geographical video content can be more effectively accessed when the geographical characteristics of that content are, exploited within the access interface and control set. Consequently, we propose the notion of a geovideoworld, which facilitates immersive, geographically- accurate access to the video content. We derive three media acquisition techniques that may be used to populate the world and three corresponding navigation scenarios that may be used to access the content within the world.

关键词： Geographic information systems

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Fobs : An open source object-oriented library for accessing multimedia content 08

Fobs : An open source object-oriented library for accessing ...

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16th ACM International conference on multimedia, MM '08

作者： Pedro, Jose San Department of Information Studies University of Sheffield Regent Court 211 Portobello St Sheffield S14DP United Kingdom

ISBN: (纸本)9781605583037

The exceptionally large nature of multimedia content has motivated the creation of many different compression algorithms and encapsulation formats to make its transportation and storage feasible. Developers of multimedia applications have to deal repeatedly with the massive number of forms in which content is present, turning the single task of media access into an unnecessary challenge. The open source project FOBS provides a way to abstract developers from these difficulties, by offering an intuitive and powerful object oriented multimedia access API. FOBS has been conceived to be in-herently platform independent and to be easily adaptable to multiple programming languages, making the addition of multimedia support possible in almost any application.

关键词： Open source software

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