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

共 2015 条记录，以下是1641-1650 订阅

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An application-based perspective on universal multimedia access using MPEG-7

An application-based perspective on universal multimedia acc...

引用

conference on multimedia systems and Applications IV

作者： Smith, JR Chillakuru, VR IBM Corp TJ Watson Res Ctr Hawthorne NY 10532 USA

ISBN: (纸本)0819442429

With the growing ubiquity and portability of multimedia-enabled devices, Universal multimedia access is emerging as one of the important applications for the next generation of multimedia systems. The basic concept underlying Universal multimedia access is the adaptation, summarization, and personalization of multimedia content according to the user environment The different dimensions for adaptation include rate reduction, adaptive spatial and temporal sampling, quality reduction, summarization, personalization, and re-editing of the multimedia content. The different relevant dimensions of the user environment include device capabilities, bandwidth, and user preferences, usage context, and spatial- and temporal-awareness. The emerging MPEG-7 and MPEG-21 standards are addressing Universal multimedia access in a number of ways. MPEG-7 provides tools for describing transcoding hints, content variations, space and frequency views, and summaries of multimedia content. MPEG-7 also provides tools for describing user preferences and usage history. MPEG-21 is addressing the description of user environment, which includes terminals and networks. In this paper, we present an application-based perspective on Universal multimedia access using MPEG-7. We describe the different tools, methods, and systems that use MPEG-7 for enabling Universal multimedia access and describe a system for annotating and transcoding images using MPEG-7.

关键词： Universal multimedia access MPEG-7 multimedia system support and delivery multimedia processing and coding universal access content adaptation pervasive computing MPEG-21

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Standards compliant watermarking for access management

Standards compliant watermarking for access management

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conference on multimedia systems and Applications IV

作者： Ratnakar, V Guleryuz, OG Epson Palo Alto Lab Palo Alto CA 94304 USA

ISBN: (纸本)0819442429

We present standards-compliant visible watermarking schemes for digital images and video in DCT-based compressed formats. The watermarked data is in the same compressed format as the original and can be viewed with standard tools and applications. Moreover, for most of the schemes presented, the watermarked data has exactly the same compressed size as the original. The watermark can be inserted and removed using a key for applications requiring content protection. The watermark application and removal algorithms are very efficient and exploit some features of compressed data formats (such as JPEG and MPEG) which allow most of the work to be done in the compressed domain.

关键词： visible watermarks scrambler discrete cosine transform JPEG MPEG content protection

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An efficient slot allocation algorithm to accommodate multimedia traffic in CDMA/TDD-Based wireless communications systems

An efficient slot allocation algorithm to accommodate multim...

引用

54th IEEE Vehicular Technology conference (VTC 2001)

作者： Yomo, H Nakata, A Hara, S Osaka Univ Grad Sch Engn Dept Elect Informat & Energy Engn Suita Osaka 5650871 Japan

ISBN: (纸本)0780370058

In this paper, we propose two time slot allocation algorithms for code division multiple access scheme with time division duplex (CDMA/TDD) systems to efficiently accommodate multimedia traffic. Assuming a practical multiple cell environment and a multimedia service model which consists of several kinds of circuit-switched and packet-switched services with different quality of services (QoSs), we evaluate the average delay of the CDMA/TDD system with the proposed algorithms, and compare the performance with that of CDMA with frequency division duplex (CDMA/FDD) and time division multiple access with TDD (TDMA/TDD) systems. Our computer simulation results show that the CDMA/TDD system with one of the proposed algorithms, which can effectively avoid interference among users with different QoSs, can improve the average delay performance as compared with the other systems.

关键词： Wireless telecommunication systems

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A key transport protocol based on secret sharing - An application to conditional access systems

A key transport protocol based on secret sharing - An applic...

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Security and Watermarking of multimedia contents III conference

作者： Eskicioglu, AM Thomson Multimedia Indianapolis IN 46290 USA

ISBN: (纸本)0819439924

In today's digital world, multimedia content is delivered to homes via the Internet, satellite, terrestrial and cable networks. Scrambling is a common approach used by conditional access systems to prevent unauthorized access to audio/visual data. The descrambling keys are securely distributed to the receivers in the same transmission channel. Their protection is an important part of the key management problem. Although public-key cryptography provides a viable solution, alternative methods are sought for economy and efficiency. This paper presents a key transport protocol based on secret sharing. It eliminates the need for a cipher, yet combines the advantages of symmetric and public-key ciphers.

关键词： conditional access content protection key transport multimedia public-key cryptography secret sharing symmetric cipher

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A flexible content and context-based access control model for multimedia medical image database systems 01

A flexible content and context-based access control model fo...

引用

-ACM multimedia 2001 Workshops-multimedia and Security: New Challenges

作者： Tzelepi, S.K. Koukopoulos, D.K. Pangalos, G. Informatics Laboratory Faculty of Technology Aristotelian University Thessaloniki 54006 Greece

ISBN: (纸本)9781581133936

In many health care information systems medical images are an important part of the multimedia medical patient record. Most of the work on multimedia medical images security until now has focused on cryptographic approaches. While valuable, cryptography is not enough to control access to medical images. Therefore additional protection approaches should be applied at a higher level. Role-based access control (RBAC) is a good candidate to provide access control in a multimedia medical image database system. Roles accurately describe which types of people need to access to certain types of objects. However, in a multimedia medical image database system, specifications of image access rights are often content and context-dependent as well as time-dependent. Unfortunately, RBAC cannot be used to handle the above requirements. In this paper we describe an extended role-based access control model by considering, in the specification of the Role-Permission relationship phase, the constraints which must be satisfied in order for the holders of the permission to use those permission. The use of constraints allows role-based access control to be tailored to specify very fine-grained, flexible, content, context and time-based access control policies. The proposed access control model preserves the advantages of scaleable security administration that RBAC-style models offer and yet offers the flexibility to specify complex access restrictions based on the semantic content of the images, the attributes of the user accessing the image, the relationship between the user and the patient whose images are to be accessed and the time. The description of an access control algorithm and a system architecture for a secure medical image DBMS are also presented.

关键词： multimedia systems

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Intelligent systems for video analysis and access over the Internet

Intelligent systems for video analysis and access over the I...

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作者： Zhou, Wensheng University of Southern California

学位级别：Ph.D.

This dissertation presents a solution to problems arising from the demand for fast information access and for sharing in real-time multimedia transmission over the Internet. Our solution exploits software agents that are placed throughout the network environment. These hierarchical video analysis agents process multimedia streams in real time, and automatically decompose and understand the multimedia content so as to facilitate information access and sharing. multimedia content contains both the perceptual content such as color, motion, or acoustic features and the conceptual content, which is specified based on concepts or semantics that can be expressed by text descriptions. Both types of contents are embedded simultaneously in multimedia streams, and usually are complementary to each other. This dissertation adaptively analyzes both kinds of video contents by combining mixed media cues from audio, video and text. First, a high-performance module for on-line video segmentation based on scene-change detection is developed. It serves as the first step of any video stream construction and analysis. To meet the high computational demand, our proposed video scene change detection algorithms are very efficient while maintaining high accuracy and recall rates for fast on-line video analysis. Second, the perceptual features of audio and video data are analyzed in a bottom-up manner and integrated so as to discriminate among the different events in any video stream effectively. An efficient decision-tree learning algorithm is used to induce a set of if-then rules which link perceptual features with the video conceptual semantic contents. These rules not only serve as a video classifier, but also guide on-line real-time video/audio feature extraction and data redistribution. A novel knowledge-based system, where knowledge is stored as learned rules, is proposed to serve as a video semantic inference/classification engine. Third, we propose a hierarchical video categorizatio

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Limitations and requirements of content-based multimedia authentication systems

Limitations and requirements of content-based multimedia aut...

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Security and Watermarking of multimedia contents III conference

作者： Wu, CW IBM Corp Thomas J Watson Res Ctr Div Res Yorktown Hts NY 10598 USA

ISBN: (纸本)0819439924

Recently, a number of authentication schemes have been proposed for multimedia data such as images and sound data. They include both label based systems and semifragile watermarks. The main requirement for such authentication systems is that minor modifications such as lossy compression which do not alter the content of the data preserve the authenticity of the data, whereas modifications which do modify the content render the data not authentic. These schemes can be classified into two main classes depending on the model of image authentication they are based on. One of the purposes of this paper is to look at some of the advantages and disadvantages of these image authentication schemes and their relationship with fundamental limitations of the underlying model of image authentication. In particular, we study feature-based algorithms which generate an authentication tag based on some inherent features in the image such as the location of edges. The main disadvantage of most proposed feature-based algorithms is that similar images generate similar features, and therefore it is possible for a forger to generate dissimilar images that have the same features. On the other hand, the class of hash-based algorithms utilizes a cryptographic hash function or a digital signature scheme to reduce the data and generate an authentication tag. It inherits the security of digital signatures to thwart forgery attacks. The main disadvantage of hash-based algorithms is that the image needs to be modified in order to be made authenticatable. The amount of modification is on the order of the noise the image can tolerate before it is rendered inauthentic. The other purpose of this paper is to propose a multimedia authentication scheme which combines some of the best features of both classes of algorithms. The proposed scheme utilizes cryptographic hash functions and digital signature schemes and the data does not need to be modified in order to be made authenticatable. Several applica

关键词： data authentication cryptography digital signatures hash functions digital watermarks digital notary

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Distributional clustering for content-based browsing of unstructured video

Distributional clustering for content-based browsing of unst...

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2nd conference on Internet Imaging

作者： Iyengar, G IBM Corp Thomas J Watson Res Ctr Giridharan Iyengar Human Language Technol Yorktown Heights NY 10598 USA

ISBN: (纸本)0819439894

The focus of this paper is to facilitate access into an important class of multimedia content: unscripted and causally shot home videos. Unlike scripted video (such as movies and commercials), video that has been shot for the simple purpose of recording an event or place has no structure to facilitate its access. Our approach to tackling the unstructured video problem is to use clustering techniques to create multiple groupings of the video. We describe two clustering algorithms in this paper, which assume fairly general probability density descriptions of video. In addition, we describe an application built upon these clustering algorithms that enables browsing and rescripting unstructred content.

关键词： content based retrieval

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Preservation and access of cultural heritage objects through a Digital Archive Network for Anthropology 7

Preservation and access of cultural heritage objects through...

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7th International conference on Virtual systems and multimedia (VSMM 2000)

作者： Clark, JT Slator, BM Bergstrom, A Larson, F Frovarp, R Landrum, JE Perrizo, W N Dakota State Univ Dept Sociol & Anthropol Comp Sci Informat Technol Serv Fargo ND 58105 USA

ISBN: (纸本)0769514022

In 1999, the Archaeology Technologies Laboratory (ATL) at North Dakota State University (NDSU) began developing an Internet-based Digital Archive Network for Anthropology (DANA). This federation of databases links researchers, students, and the general public to distributed databases that include realistic, accurate, three-dimensional (313), visual representations of artifacts, fossils, and other objects, along with 2D digitized documents (e.g., maps, plan views, excavation profiles, and photographs) and various associated data. DANA is being created through development and implementation of cross-platform, open standards that will facilitate interoperability and exchange of information between remote systems. DANA enables dynamic use of digital models, virtual measurement tools, and an array of data supplied by contributing content providers (collaborators) for education and scholarly research. This online network of anthropology resources facilitates reliable, "anytime, anywhere" access to content and services. DANA constitutes an enormously valuable learning resource that can be accessed and used at all levels, from K-12, to undergraduate, to post-graduate, to professional, to lifelong learning.

关键词： Interoperability

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ELM-N: E-learning Media Navigator

ELM-N: E-learning Media Navigator

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-ACM multimedia 2001 Workshops- 2001 multimedia conference

作者： Dorai, C. Kermani, P. Stewart, A. IBM T.J. Watson Research Center P.O. Box 704 Yorktown Heights NY 10598 United States

E-learning or learning via the Web is now changing the way universities and corporations offer education and training. Rather than using conventional means for remotely distributing and delivering courses and classroom lectures, universities and enterprises are moving towards Web-based academic and training offerings. While content acquisition and distribution can be automated in a systematic fashion, research challenges remain in the area of personalized content delivery, access, and augmented interaction. Automated content indexing and annotation for easy and efficient access and navigation of various media elements associated with the course material become key tasks in flexible content delivery and use. E-Learning Media Navigator (ELM-N) from IBM Research is a system with which a user can access and interact with online courses presented as audiovisual material, along with related slides and white board contents in a time-synchronized fashion. In this demonstration, the system capabilities and the research technologies behind them will be presented.

关键词： multimedia systems

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