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IEEE International conference on Consumer Electronics (ICCE)

作者： Danish, Emad De Silva, Varuna Fernando, Anil De Alwis, Chamitha Kondoz, Ahmet Univ Surrey I Lab Multimedia Commun Res Guildford GU2 5XH Surrey England

ISBN: (纸本)9781479912919

For OFDM channels, we propose a content-aware subcarrier allocation scheme for multiuser video transmission that maximizes user perceived quality while minimizing power consumption. The scheme utilizes utility function-based genetic algorithms to solve the multi-objective optimization problem. It significantly outperforms existing methods in terms of perceived quality and consumed power.

关键词： OFDM modulation genetic algorithms multimedia communication video communication OFDM channel OFDM systems content-aware resource allocation content-aware subcarrier allocation scheme energy-efficient video transmission multiobjective optimization problem multiuser video transmission power consumption minimization user perceived quality maximization utility function-based genetic algorithm Bit rate Genetic algorithms Joints OFDM Quality assessment Resource management Video recording

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Layered semantic architecture of multimedia data

Layered semantic architecture of multimedia data

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Proceedings of the Seventh IASTED International conference on Internet and multimedia systems and Applications

作者： Gong, Zhiguo Zhang, Jia Faculty of Science and Technology University of Macau P.O. Box 3001 Macao China infiNET Solutions 1425 E. Busch Parkway Buffalo Grove IL 60089 United States

ISBN: (纸本)0889863806

multimedia data, which are direct reflections of the real world, have unlimited semantic interpretations within different application domains. In order to reuse information resources, in this paper, we provide a layered architecture of multimedia schema - raw multimedia layer, domain knowledge layer, and user profile layer. Raw multimedia layer provides non-semantic management of data, including storage allocations, buffer algorithms and strategies, and multimedia preprocessing facilities. Domain knowledge layer provides semantic-oriented management and access of multimedia data. Different domains can utilize different knowledge bases to support semantic interpretations. We use Frame and Semantic Network as the representation models for domain knowledge. content-based retrievals can be performed on different levels of visual object constructions or concept abstractions. Furthermore, since different individual users may have different interpretations for fuzzy specifications in their queries, user profiles are created and used to support fuzzy retrievals of multimedia data.

关键词： multimedia systems

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Semantics-Driven multimedia Data access

Semantics-Driven Multimedia Data Access

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31st International conference on Information Technology Interfaces

作者： Dardala, Marian Reveiu, Adriana Smeureanu, Ion Acad Econ Studies Bucharest Bucharest Romania

ISBN: (纸本)9789537138158

The multimedia data are more present in the actual informatics systems. Because of characteristics of multimedia data, their management and querying techniques are unlike than those of traditional data. We can increase the potential use of multimedia data across various applications by assuring semantics-driven access to multimedia data. In this paper we propose a solution, based on MPEG-21 standard, to describe the multimedia content and to integrate it with the semantic web.

关键词： Data access MPEG-21 standard multimedia data ontology semantic web

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multimedia streaming over IP with QoS and access control 12

Multimedia streaming over IP with QoS and access control

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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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Selective multimedia access protocol for wireless multimedia communication

Selective multimedia access protocol for wireless multimedia...

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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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MPEG-7 MDS-based application specific metadata model for personalized multi-service access in a DTV broadcast environment

MPEG-7 MDS-based application specific metadata model for per...

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IEEE International conference on multimedia and Expo (ICME)

作者： Tsekeridou, S Democritus Univ Thrace Dept Elect & Comp Engn GR-67100 Xanthi Greece

ISBN: (纸本)0780393317

The paper presents an MPEG-7 multimedia Description Schemes (MDS)-based metadata and user profile model used within,in enhanced DTV environment for semantic annotation and personalized access to multiple sports DTV services. It is shown that in order to enable intelligent and personalized processing, management and use of multimedia content and services, the use of application specific metadata descriptions and adequately formulated user profiles is most important. Thus, application specific semantic metadata and user profile definitions are presented in this paper. Metadata and user profile instances are generated by Authoring/Annotation tools or User Profile Registration client applications respectively. Personalized access to sports DTV services is achieved by metadata and user profile instance description matching and content filtering at either the server or the client side. At the same time, dynamic client configuration, transparent to the end-User, is accomplished by automatically processing configuration specific metadata descriptions using specially designed application modules at the client side. The main purpose is to enable personalized integrated multimedia services access in the sports domain over DTV infrastructures.

关键词： multimedia systems

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Design and Evaluation of Security Multi-Media Warnings for Children's Smartphones

Design and Evaluation of Security Multi-Media Warnings for C...

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conference on multimedia on Mobile Devices and multimedia content access - algorithms and systems VI

作者： Menzel, Wiebke Tuchscheerer, Sven Fruth, Jana Kraetzer, Christian Dittmann, Jana Otto von Guericke Univ D-39016 Magdeburg Germany

ISBN: (纸本)9780819489517

This article describes primarily the development and empiric validation of a design for security warning messages on smartphones for primary school children (7-10 years old). Our design approach for security warnings for children uses a specific character and is based on recommendations of a paediatrician expert. The design criteria are adapted to children's skills, e. g. their visual, acoustic, and haptic perception and their literacy. The developed security warnings are prototypically implemented in an iOS application (on the iPhone 3G/4G) where children are warned by a simulated anti-malware background service, while they are busy with another task. For the evaluation we select methods for empiric validation of the design approach from the field of usability testing ("think aloud" test, questionnaires, log-files, etc.). Our security warnings prototype is evaluated in an empiric user study with 13 primary school children, aged between 8 and 9 years and of different gender (5 girls, 8 boys). The evaluation analysis shows, that nearly all children liked the design of our security warnings. Surprisingly, on several security warning messages most of the children react in the right way after reading the warning, although the meaning couldn't be interpreted in the right way. Another interesting result is, that several children relate specific information, e. g. update, to a specific character. Furthermore, it could be seen that most of the primary school test candidates have little awareness of security threats on smartphones. It is a very strong argument to develop e. g. tutorials or websites in order to raise awareness and teach children how to recognize security threats and how to react to them. Our design approach of security warnings for children's smartphones can be a basis for warning on other systems or applications like tutorials, which are used by children. In a second investigation, we focus on webpages, designed for children since smartphones and webpages (t

关键词： security warnings webpages children user-centered studies smartphones

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Multiple 3D Chaotic systems Based Approach for Visual multimedia content Protection

Multiple 3D Chaotic Systems Based Approach for Visual Multim...

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4th ObCom International conference on Recent Trends in Computing, Communication and Information Technology

作者： Ahmad, Musheer Ahmad, Tanvir Gupta, Chirag Jamia Millia Islamia Fac Engn & Technol Dept Comp Engn New Delhi 110025 India

ISBN: (纸本)9783642292156

The sharing, distribution and transmission of proliferated digital multimedia contents over the insecure worldwide available Internet and wired/wireless networks has encouraged the copyright fraud, unauthorized access and illegal usage. This brings new technical challenges to provide the end-to-end security to multimedia contents for establishing ownership rights, ensuring authorized access, preventing illegal replication etc. To address the above mentioned requirements, a visual multimedia content protection technique is proposed. The technique is based on the high dynamic responses of multiple high-dimensional chaotic systems. The multimedia encryption is achieved by randomly picking the actual encryption keys out of numbers of hybridized keys that are extracted from complex sequences of three high dimensional chaotic systems. Accordingly, a high encryption effect is turned up in the encrypted content. The proposed technique is experimented on the multimedia color imagery. The decomposed R, G, B components of color plain-image are initially diffused with their self, before diffusing with encryption keys. It is experimentally verified that the proposed technique has great encryption performance and achieves high confidential security. Eventually, the statistical results confirm the practicability and suitability of the approach for visual multimedia content protection.

关键词： multimedia protection multiple chaotic systems diffusion security color image encryption

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Scalable encryption for multimedia content access control

Scalable encryption for multimedia content access control

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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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Dual watermarking framework for privacy protection and content authentication of multimedia

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FUTURE GENERATION COMPUTER systems-THE INTERNATIONAL JOURNAL OF ESCIENCE 2019年 94卷 654-673页

作者： Hurrah, Nasir N. Parah, Shabir A. Loan, Nazir A. Sheikh, Javaid A. Elhoseny, Mohammad Muhammad, Khan Univ Kashmir Post Grad Dept Elect & Instrumentat Technol Srinagar 190006 Jammu & Kashmir India Mansoura Univ Fac Comp & Informat El Gomhouria St Mansoura 35516 Egypt Sejong Univ Digital Contents Res Inst Intelligent Media Lab Seoul South Korea

In the current multimedia networked infrastructure, privacy breaches due to cyber-attacks result in huge economic losses. Despite these threats there is ever increasing demand to share data over various insecure networks for accomplishment of numerous tasks. In such a scenario there is a greater need to develop new algorithms for strengthening the existing cybersecurity frameworks, ensure security, privacy, copyright protection and authentication of data. In this paper a new technique for copyright protection, data security and content authentication of multimedia images is presented. The copyright protection of the media is taken care of by embedding a robust watermark using an efficient inter-block coefficient differencing algorithm and is proposed as Scheme I. Scheme II has been utilized to ensure both copyright protection, and content authentication. The authentication of the content has been ensured by embedding a fragile watermark in spatial domain while as copyright protection has been taken care of utilizing a robust watermark. In order to thwart an adversary and ensure that it has no access to actual embedded data, we make use of a novel encryption algorithm in conjunction with Arnold transform to encrypt data prior to its embedding. The experimental results reveal that the proposed framework offers high degree of robustness against single/dual/triple attacks;with Normalized Correlation (NCC), more than or equal to 0.95. Besides, the fragile watermark embedding makes the system capable of tamper detection and localization with average BER more than 45% for all signal processing/geometric attacks. The average PSNR achieved for both schemes is greater than 41 dB. A comparison of the proposed framework with various state-of-the-art techniques demonstrate its effectiveness and superiority. (C) 2018 Elsevier B.V. All rights reserved.

关键词： multimedia security Cyber-attack Cybersecurity Robustness Copyright protection content authentication

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