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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151-160 订阅

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Building multicast trees for multimedia streaming in heterogeneous P2P networks

Building multicast trees for multimedia streaming in heterog...

引用

International conference on systems Communications

作者： Tan, XR Datta, S York Univ Dept Comp Sci & Engn Toronto ON M3J 2R7 Canada

ISBN: (纸本)0769524222

P2P networks have been proposed as a scalable, inexpensive solution to the problem of distributing multimedia content over the Internet. Since real P2P systems exhibit considerable heterogeneity in hardware, software and network connections, the design of P2P streaming networks must factor in this variation. There are two different sources of heterogeneity in P2P networks. Most existing work in the literature handle heterogeneity among receivers and requirements by the use of different multimedia encodings of the same content. In this paper we focus on the problems caused by heterogeneity in the network delays connecting receivers to the sender We assume that there is a single multicast tree and a single video stream. We propose new algorithms for building multicast trees for multimedia streaming in heterogeneous P2P networks. Our algorithms differ in the amount of communication and computational resources they require. We compare the performance (using simulations) of our algorithms with an existing algorithm Zigzag [20, 2 1]. Our results show that two of our algorithms (algorithm FollowTree-Landmark-II and algorithm FollowTree) significantly outperform Zigzag.

关键词： Multicasting

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ArabicTutor: a multimedia m-Learning Platform for Learning Arabic Spelling and Vocabulary

ArabicTutor: a Multimedia m-Learning Platform for Learning A...

引用

International conference on multimedia Computing and systems (ICMCS)

作者： Erradi, Abdelkarim Nahia, Sajeda Almerekhi, Hind Al-kailani, Lubna Qatar Univ Dept Comp Sci & Engn Doha Qatar

ISBN: (纸本)9781467315203

Internet-enabled Mobile devices are increasingly used for enhancing the learning experience particularly for language learning. They can be exploited to allow learners to access and interact with multimedia learning resources from anywhere and at any time while offering an enhanced user experience. There are many systems for English learning such as ***. However there aren't many such mobile learning tools for Arabic. In this context, this paper addresses the need to leverage mobile-supported learning to ease learning Arabic. We report the experience of designing and developing a multimedia m-Learning platform (named ArabicTutor) for interactive learning of Arabic spelling and vocabulary. It uses interactive game-like delivery methods to acquire new linguistic skills in playful manner using the capabilities of modern mobile devices with multitouch technologies. The proposed platform provides an environment of authoring Arabic learning content and delivering it to the end-users in interactive, intuitive and enjoyable way. The learning content is organized into packages that contain a list of word, the different meanings of words with example sentences and multimedia illustrations. The package also contains other related linguistic and morphological information such as parts of speech of example sentences and their diacritization.

关键词： multimedia m-Learning Technology-enhanced Language Learning ArabicTutor

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Scalable encryption for multimedia content access control

Scalable encryption for multimedia content access control

引用

2003 International conference on multimedia and Expo, ICME 2003

作者： Yu, Hong Heather Panasonic Information and Networking Technologies Laboratory Korea Republic of

ISBN: (纸本)0780379659

Traditional cryptography systems treat every portion of a message (a video, an image, or an audio) equally and encrypt the entire message as a whole. As a result, those security systems often have only two states: access authorization and access denial. To facilitate multi-level access control with interoperability, scalable security mechanism is needed. Further, the availability of varying network bandwidth and diverse receiver device capabilities demand scalable and flexible approaches that are capable of adapting to changing network conditions as well as device capabilities. In this paper, we describe a multimedia encryption scheme that supports scalability. One desirable feature of the proposed scheme is its simplicity and flexibility in supporting scalable content access control. © 2003 IEEE.

关键词： Authorization

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Fast adaptation decision taking for cross-modal multimedia content adaptation

Fast adaptation decision taking for cross-modal multimedia c...

引用

IEEE International conference on multimedia and Expo (ICME 2006)

作者： Prangl, Martin Hellwagner, Hermann Klagenfurt Univ Dept Informat Technol Univ Str 65-67 A-9020 Klagenfurt Austria Hungarian Acad Sci eLearning Dept Comp & Automat Res Inst H-1111 Budapest Hungary

ISBN: (纸本)9781424403660

In order to enable transparent and convenient use of multimedia content across a wide range of networks and devices, content adaptation is an important issue within multimedia frameworks. The so called Digital Item Adaptation (DIA) standard is one of the core concepts of the MPEG-21 framework that will support the adaptation of multimedia resources according to device capabilities, underlying network characteristics, and user preferences. Most multimedia adaptation engines for providing Universal multimedia access (UMA) scale the content with respect to terminal capabilities and resource constraints. This paper focuses on the cross-modal adaptation decision taking process considering the user environment and terminal capabilities as well as resource limitations on the server, network, and client side. This approach represents a step toward increased Universal multimedia Experience (UME). Based on four different algorithms for solving this optimization process, we present an evaluation of results gained by running their implementations on different test networks.

关键词： Decision making

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accessing multimedia content from Mobile Applications using Semantic Web Technologies

Accessing Multimedia Content from Mobile Applications using ...

引用

conference on Mobile Devices and multimedia - Enabling Technologies, algorithms, and Applications

作者： Kreutel, Joern Gerlach, Andrea Klekamp, Stefanie Schulz, Kristin Beuth Univ Appl Sci Berlin Germany stefanieklekamp Berlin Germany Humboldt Univ Berlin Germany

ISBN: (纸本)9780819499479

We describe the ideas and results of an applied research project that aims at leveraging the expressive power of semantic web technologies as a server-side backend for mobile applications that provide access to location and multimedia data and allow for a rich user experience in mobile scenarios, ranging from city and museum guides to multimedia enhancements of any kind of narrative content, including e-book applications. In particular, we will outline a reusable software architecture for both server-side functionality and native mobile platforms that is aimed at significantly decreasing the effort required for developing particular applications of that kind.

关键词： Data modeling multimedia Human-machine interfaces Visualization Computer architecture Data storage Information operations Modeling Data storage servers Java

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content-Based Image Retrieval With Ontological Ranking

Content-Based Image Retrieval With Ontological Ranking

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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： Tsai, Shen-Fu Tsai, Min-Hsuan Huang, Thomas S. Univ Illinois Coordinated Sci Lab Urbana IL 61801 USA

ISBN: (纸本)9780819479334

Images are a much more powerful medium of expression than text, as the adage says: "One picture is worth a thousand words." It is because compared with text consisting of an array of words, an image has more degrees of freedom and therefore a more complicated structure. However, the less limited structure of images presents researchers in the computer vision community a tough task of teaching machines to understand and organize images, especially when a limit number of learning examples and background knowledge are given. The advance of internet and web technology in the past decade has changed the way human gain knowledge. People, hence, can exchange knowledge with others by discussing and contributing information on the web. As a result, the web pages in the internet have become a living and growing source of information. One is therefore tempted to wonder whether machines can learn from the web knowledge base as well. Indeed, it is possible to make computer learn from the internet and provide human with more meaningful knowledge. In this work, we explore this novel possibility on image understanding applied to semantic image search. We exploit web resources to obtain links from images to keywords and a semantic ontology constituting human's general knowledge. The former maps visual content to related text in contrast to the traditional way of associating images with surrounding text;the latter provides relations between concepts for machines to understand to what extent and in what sense an image is close to the image search query. With the aid of these two tools, the resulting image search system is thus content-based and moreover, organized. The returned images are ranked and organized such that semantically similar images are grouped together and given a rank based on the semantic closeness to the input query. The novelty of the system is twofold: first, images are retrieved not only based on text cues but their actual contents as well;second, the grouping is

关键词： Image retrieval ontology multimedia

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multimedia streaming over IP with QoS and access control 12

Multimedia streaming over IP with QoS and access control

引用

12th International conference on Distributed multimedia systems, DMS 2006

作者： Giordano, Massimiliano Polese, Giuseppe Tortora, Genoveffa Dipartimento di Matematica e Informatica Università di Salerno Via Ponte Don Melillo FiscianoSA84084 Italy

ISBN: (纸本)1891706195

The paper describes a system to manage the distribution of multimedia content over IP with the support of QoS and fine grained access control. It relies on visual languages to simplify the specification of complex access control and QoS policies in distributed multimedia streaming services. QoS is based on the RSVP protocol, whereas access control is provided based on the RBAC model. In particular, the system translates the visually specified policies into the XACML format, which also embeds the QoS parameters that will be successively used in RSVP negotiations. © 2006 by Knowledge systems Institute Graduate School. All rights reserved.

关键词： access control

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Ubiquitous picture rich content representation

Ubiquitous picture rich content representation

引用

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

作者： Wang, Wiley Dean, Jennifer Muzzolini, Russ Shutterfly Inc. (United States)

ISBN: (纸本)9780819479334

The amount of digital images taken by the average consumer is consistently increasing. People enjoy the convenience of storing and sharing their pictures through online (digital) and offline (traditional) media. A set of pictures can be uploaded to: online photo services, web blogs and social network websites. Alternatively, these images can be used to generate: prints, cards, photo books or other photo products. Through uploading and sharing, images are easily transferred from one format to another. And often, a different set of associated content (text, tags) is created across formats. For example, on his web blog, a user may journal his experiences of his recent travel;on his social network website, his friends tag and comment on the pictures;in his online photo album, some pictures are titled and keyword-tagged. When the user wants to tell a complete story, perhaps in a photo book, he must collect, across all formats: the pictures, writings and comments, etc. and organize them in a book format. The user has to arrange the content of his trip in each format. The arrangement, the associations between the images, tags, keywords and text, cannot be shared with other formats. In this paper, we propose a system that allows the content to be easily created and shared across various digital media formats. We define a uniformed data association structure to connect: images, documents, comments, tags, keywords and other data. This content structure allows the user to switch representation formats without reediting. The framework under each format can emphasize (display or hide) content elements based on preference. For example, a slide show view will emphasize the display of pictures with limited text;a blog view will display highlighted images and journal text;and the photo book will try to fit in all images and text content. In this paper, we will discuss the strategy to associate pictures with text content, so that it can naturally tell a story. We will also list sampl

关键词： photo book photo sharing website content association content representation

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引用

conference on multimedia Storage and Archiving systems III

作者： Alpkocak, A Ozkarahan, E Dokuz Eylul Univ Dept Comp Engn TR-35100 Izmir Turkey

ISBN: (纸本)0819429880

A multimedia object is represented by several kinds of feature vectors which are (semi)-automatically extracted. Therefore, a multimedia information system must employ multiple search and indexing mechanisms due to integration of multiple search modalities such as querying for search and for indexing, keywords and other content-based feature vectors extracted from multimedia objects such as color, texture, shape or sketch. However, today there is no indexing method for content based retrieval of such feature combinations and there is an increasing need for multiple-feature indexing in content based multimedia retrieval systems. In this paper, we introduce a new file structure called Spatial Grid File (SGF). This file structure enables to index multimedia objects by different and independent high-dimensional feature vectors. Moreover, with it, complex queries involving combined retrieval can be efficiently performed. It has unique feature in combining set of search modes each having different properties and similarity metrics. The detailed descriptions of SGF and a summary of the results obtained from the experiments are included.

关键词： content-based multimedia retrieval content based indexing similarity indexing spatial access methods

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Selective multimedia access protocol for wireless multimedia communication

Selective multimedia access protocol for wireless multimedia...

引用

1997 IEEE Pacific Rim conference on Communications, Computers and Signal Processing

作者： Ohta, K Watanabe, T Mizuno, T Shizuoka Univ Shizuoka Japan

ISBN: (纸本)0780339061

Users desire to use multimedia applications such as browsing WWW and VoD in not only desktop computing environment but also wireless or mobile computing environment. A wireless link, however, is generally poor in quality to accommodate multimedia communication. We propose a content-based multimedia communication protocol for wireless environment. It adopts the selective transport service according to content-based priority, assigned to each scene of multimedia data, so that a user can get important information even if available bandwidth is insufficient for the multimedia data.

关键词： Interactive computer systems

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