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

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Proceedings of the 1998 conference on Electronic Imaging and multimedia systems II

Proceedings of the 1998 Conference on Electronic Imaging and...

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Proceedings of the 1998 conference on Electronic Imaging and multimedia systems II

The proceedings contains 61 papers from the SPIE International Society for Optical Engineering Journal on Electronic Imaging and multimedia systems II. Topics discussed include: image retrievals;gray image recognition;content-based image retrieval;color pattern selections;video segmentations;declarative video data retrieval languages;network databases;fast spatial transformations;moving object segmentation methods;anisotropic segmentations;video segmentation algorithms;wavelet-derived gradient computations;dual-band imaging systems;genetic algorithms;thermal image compression systems;multimedia-on-demand services;personal digital assistant (PDA) systems;and real-time nonlinear video authoring systems.

关键词： Image processing

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Overview of image security techniques with applications in multimedia systems

Overview of image security techniques with applications in m...

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conference on multimedia Networks - Security, Displays, Terminals, and Gateways

作者： Wolfgang, RB Delp, EJ Purdue Univ Sch Elect & Comp Engn Video & Image Proc Lab VIPER W Lafayette IN 47907 USA

ISBN: (纸本)081942661X

The growth of networked multimedia systems has created a need for the copyright-protection of digital images and video;Copyright protection involves the authentication of image content and/or ownership. This can be used to identify illegal copies of a (possibly forged) image. One approach is to mark an image by adding an invisible structure known as a digital watermark to the image. Techniques of incorporating such a watermark into digital images include spatial-domain techniques, transform-domain algorithms and sub-band filtering approaches.

关键词： multimedia Digital watermarking Digital filtering Image filtering Video

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multimedia as a competitive success factor in textile and apparel industry

Multimedia as a competitive success factor in textile and ap...

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IEEE conference on Information Visualization

作者： Neves, M Vieira, S Univ Minho Escola Engn Dept Engn Text P-4800 Guimaraes Portugal

ISBN: (纸本)0818685093

The presented work is based on the assumption that severe difficulties may be found by the generality of the agents of the textile process chain, during the implementation of "quick-response" strategies. These difficulties go through the inertia on the establishment of partnership relations between those different agents as well as in the communication between them. Therefore, multimedia may be presented as the one of the most complete solutions aiming the establishment of an adequate communication policy between clients and suppliers, namely at the commercial and product development level. The aim is to present different developed or under development solutions, which use multimedia technologies aiming a quick access to information of consumer's desires.

关键词： Interactive computer systems

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Extended object-oriented database approach to networked multimedia applications

Extended object-oriented database approach to networked mult...

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Proceedings of the 1998 14th International conference on Data Engineering

作者： Ishikawa, Hiroshi Kato, Koki Ono, Miyuki Yoshizawa, Naomi Kubota, Kazumi Kanaya, Akiko Fujitsu Lab Ltd Kawasaki Japan

New multimedia applications, such as digital libraries and document warehousing, require next-generation database systems enabling users to efficiently and flexibly develop and execute such networked applications. To this end, we focus on development of a database system which enables flexible and efficient acquisition, storage, access and retrieval, and distribution and presentation of large amounts of heterogeneous media data. We propose a multimedia database system for networked multimedia applications, based on an OODB model extended with agents. We describe an early prototype multimedia database system to verify the proposed approach, which supports multimedia scripts, keyword-based and content-based view retrieval with QOS control, Self-Organizing-Map-based clustering, and WWW integration.

关键词： Database systems

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Dynamic storage in resource scarce browsing multimedia applications

Dynamic storage in resource scarce browsing multimedia appli...

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conference on multimedia Storage and Archiving systems III

作者： Elenbaas, H Dimitrova, N Philips Res Labs Briarcliff Manor NY 10510 USA

ISBN: (纸本)0819429880

In the convergence of information and entertainment there is a conflict between the consumers's expectation of fast access to high quality multimedia content through narrow bandwidth channels versus the size of this content. During the retrieval and information presentation of a multimedia application there are two problems that have to be solved: the limited bandwidth during transmission of the retrieved multimedia content and the limited memory for temporary caching. In this paper we propose an approach for latency optimization in information browsing applications. We propose a method for flattening hierarchically linked documents in a manner convenient for network transport over slow channels to minimize browsing latency. Flattening of the hierarchy involves linearization, compression and bundling of the document nodes. After the transfer, the compressed hierarchy is stored on a local device where it can be partly unbundled to fit the caching limits at the local site while giving the user availability to the content. This optimal bundling method will work for general Web browsing, wireless browsing as well as video library applications. In the paper we consider the video library browsing in more detail. The video is summarized in a Visual Table of content (VToC), which consists of sample multimedia content items such as video segments, images, audio, text and other derived information. The physical structure holding VToC is stored in a visual index and requires considerable storage size. During the storage process, the index must be flattened to a linear structure in order to be retrieved from a low bandwidth medium. We discuss the methods to optimize the retrieval latency. Specifically, we consider how to linearize the visual index structure in different segments with ordered download priorities while constraining the bandwidth and storage. The system could adjust the user's personal preferences by learning from consumer use patterns.

关键词： Video Visualization multimedia Human-machine interfaces Data storage Data communications Data modeling Image segmentation Internet Whole body imaging

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Database technology and the management of multimedia data in Mirror

Database technology and the management of multimedia data in...

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conference on multimedia Storage and Archiving systems III

作者： de Vries, AP Blanken, HM Univ Twente CTIT NL-7500 AE Enschede Netherlands

ISBN: (纸本)0819429880

multimedia digital libraries require an open distributed architecture instead of a monolithic database system. In the Mirror project, we use the Monet extensible database kernel to manage different representations of multimedia objects. To maintain independence between content, meta-data, anti the creation of meta-data, we allow distribution of data and operations using CORBA. This open architecture introduces new problems for data access. From an end user's perspective, the problem is how to search the available representations to fulfill an actual information need;the conceptual gap between human perceptual processes and the meta-data is too large. From a system's perspective, several representations of the data may semantically overlap or be irrelevant. We address these problems with an iterative query process and active user participation through relevance feedback. A retrieval model based on inference networks assists the user with query formulation. The integration of this model into the database design has two advantages. First, the user can query both the logical and the content structure of multimedia objects. Second, the use of different data models in the logical and the physical database design provides data independence and allows algebraic query optimization. We illustrate query processing with a music retrieval application.

关键词： digital libraries extensible databases distributed databases database architecture multimedia query processing multimedia information retrieval relevance feedback

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Scalable security mechanisms in transport systems for enhanced multimedia services 3rd

Scalable security mechanisms in transport systems for enhanc...

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3rd European conference on multimedia Applications, Services and Techniques (ECMAST 98)

作者： Kunkelmann, T Vogler, H Moschgath, ML Wolf, L Tech Univ Darmstadt Informat Technol Transfer Off D-64283 Darmstadt Germany Tech Univ Darmstadt Inst Ind Proc & Syst Commun D-64283 Darmstadt Germany

ISBN: (纸本)3540645942

Data confidentiality is a very important issue for communication in open networks. Secure communication usually will be achieved by encryption mechanisms. For distributed multimedia applications the usage of encryption in real-time can cause a performance problem due to the time complexity of the cryptographic algorithms. In these cases partial encryption is a solution to satisfy real-time demands. In this paper we examine the usage of partial encryption in transport systems for multimedia data. This implies that the partial encryption scheme cannot take advantage of special properties of the multimedia data content. So we first demonstrate that in most cases it is sufficient to encrypt only a small portion of randomly chosen data from a video stream to achieve an adequate level of security. There are different approaches to integrate partial encryption mechanisms in transport systems. As a first approach, we investigate the integration in the transport layer. This offers several facilities for the integration. An alternative approach is located in the network layer, where alternative routing methods for a multimedia data stream are analyzed. A discussion of the impact of partial encryption to transport system mechanisms concludes this paper.

关键词： Cryptography

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Hierarchical clustering techniques for image database organization and summarization

Hierarchical clustering techniques for image database organi...

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conference on multimedia Storage and Archiving systems III

作者： Vellaikal, A Kuo, CCJ Hughes Res Labs Informat Sci Lab Malibu CA 90265 USA

ISBN: (纸本)0819429880

This paper investigates clustering techniques as a method of organizing image databases to support popular visual management functions such as searching, browsing and navigation. Different types of hierarchical agglomerative clustering techniques are studied as a method of organizing features spaces as well as summarizing image groups by the selection of a few appropriate representatives. Retrieval performance using both single and multiple level hierarchies are experimented with and the algorithms show an interesting relationship between the top k correct retrievals and the number of comparisons required. Some arguments are given to support the use of such cluster-based techniques for managing distributed image databases.

关键词： clustering content-based retrieval image databases feature space organization visual data browsing

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content-based video retrieval via motion trajectories

Content-based video retrieval via motion trajectories

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Proceedings of the 1998 conference on Electronic Imaging and multimedia systems II

作者： Shan, Man-Kwan Lee, Suh-Yin Natl Chiao Tung Univ HsinChu Taiwan

Motion is one of the most prominent features of video. For content-based video retrieval, motion trajectory is the intuitive specification of motion features. In this paper, approaches for video retrieval via single motion trajectory and multiple motion trajectories are addressed. For the retrieval via single motion trajectory, the trajectory is modeled as a sequence of segments and each segment is represented as the slope. Two quantitative similarity measures and corresponding algorithms based on the sequence similarity are presented. For the retrieval via multiple motion trajectories, the trajectories of the video are modeled as a sequence of symbolic pictures. Four quantitative similarity measures and algorithms, which are also based on the sequence similarity, are proposed. All the proposed algorithms are developed based on the dynamic programming approach.

关键词： Pattern matching

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CSVD: Approximate similarity searches in high dimensional spaces using clustering and singular value decomposition

CSVD: Approximate similarity searches in high dimensional sp...

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conference on multimedia Storage and Archiving systems III

作者： Thomasian, A Castelli, V Li, CS IBM Corp Thomas J Watson Res Ctr Yorktown Heights NY 10598 USA

ISBN: (纸本)0819429880

Many data-intensive applications, such as content-based retrieval of images or video from multimedia database and similarity retrieval of patterns;in data mining, require the ability the efficiently performing similarity queries. Unfortunately, the performance of nearest neighbor (NN) algorithms, the basis for similarity search, quickly deteriorates with the number of dimensions. In this paper we propose a method called Clustering with Singular Value Decomposition (CSVD), combining clustering and singular value decomposition (SVD) to reduce the number of index dimensions. With CSVD, points are grouped into clusters that are more amenable to dimensionality reduction than the original dataset, Experiments with texture vectors extracted from satellite images show that CSVD achieves significantly higher dimensionality reduction than SVD alone for the satellite fraction of total variance with preserved. Conversely, for thr same compression ratio CSVD results in an increase in preserved total variance with respect to SVD (e.g,, a 70% increase fear a. 20:1 compression ratio). Then, approximate NN queries are more efficiently processed, as quantified through experimental results.

关键词： Databases Earth observing sensors Satellite imaging Satellites Data compression Data mining Principal component analysis Feature extraction multimedia Video

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