&lt;title&gt;Continuous media filters for heterogeneous internetworking&lt;/title&gt;

Yeadon, Nicholas; Garcia, Fabien; Hutchinson, David; Shepherd, W. D.

doi:10.1117/12.235877

Cited by 29 publications

(5 citation statements)

References 19 publications

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“…In this section we outline five base filter operations which can be instantiated at various levels within our QoS-A for handling heterogeneity issues in order to support multipeer communications. These operations are in line with the work proposed earlier and represent initial building blocks for simple filters or more complex encoding transformation filters [35]. They are not mutually exclusive, meaning that one or more of these operations may be applied in succession to a single continuous media stream.…”

Section: B Generic Filter Mechanismssupporting

confidence: 62%

“…Future work is intended to include the scaling up of the current prototype system to examine the effects on larger-scale group communications. Also, we intend to integrate some of these mechanisms into our adaptive application projects over wireless networks [35]. Other extensions will include dealing with both audio and emerging video standards.…”

Section: Discussionmentioning

confidence: 99%

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Filters: QoS support mechanisms for multipeer communications

Yeadon

Garcia

Hutchison

et al. 1996

IEEE J. Select. Areas Commun.

124

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The nature of distributed multimedia applications is such that they require multipeer communication support mechanisms. The multimedia traffic needs to be delivered to end-systems, networks and end-users in a form that they can handle while satisfying the constraints imposed by the multimedia application. Quality of Service (QoS) mechanisms that can ensure full quality media playout at high-performance workstations, while at the same time providing appropriately filtered lower quality media for playout at other end-systems, are required. Existing multicast support mechanisms are deficient for this purpose, in a heterogeneous environment, because they work on a common denominator premise where the quality delivered depends on the least capable link or node involved in the multicast session. This paper proposes and analyses the use of filtering mechanisms as a means of supporting disparate receiver capabilities and QoS requirements. The paper describes the implementation of a number of filtering mechanisms and highlights the communications architecture within which these mechanisms are built. This architecture constitutes a specific network topology and a new protocol family developed within a UNIX-like operating system.

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Section: B Generic Filter Mechanismssupporting

confidence: 62%

Section: Discussionmentioning

confidence: 99%

Filters: QoS support mechanisms for multipeer communications

Yeadon

Garcia

Hutchison

et al. 1996

IEEE J. Select. Areas Commun.

124

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show abstract

“…This approach introduces little overhead, but may destroy the structures and syntax readily available in the unencrypted bitstream. Such structures, often indicated by special header/marker patterns, would enable many kinds of processing in delegate service providers and intermediate network links, such as bandwidth adaptation, unequal error protection, and random access [14]- [17].…”

Section: A Encryption Before and After Codingmentioning

confidence: 99%

A joint signal processing and cryptographic approach to multimedia encryption

Mao

2006

IEEE Trans. on Image Process.

109

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Abstract-In recent years, there has been an increasing trend for multimedia applications to use delegate service providers for content distribution, archiving, search, and retrieval. These delegate services have brought new challenges to the protection of multimedia content confidentiality. This paper discusses the importance and feasibility of applying a joint signal processing and cryptographic approach to multimedia encryption, in order to address the access control issues unique to multimedia applications. We propose two atomic encryption operations that can preserve standard compliance and are friendly to delegate processing. Quantitative analysis for these operations is presented to demonstrate that a good tradeoff can be made between security and bitrate overhead. In assisting the design and evaluation of media security systems, we also propose a set of multimedia-oriented security scores to quantify the security against approximation attacks and to complement the existing notion of generic data security. Using video as an example, we present a systematic study on how to strategically integrate different atomic operations to build a video encryption system. The resulting system can provide superior performance over both generic encryption and its simple adaptation to video in terms of a joint consideration of security, bitrate overhead, and friendliness to delegate processing.

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“…Therefore, scalable media formats have been developed, which allow more efficient adaptation of media streams through media filtering, e.g., MPEG-2 (ISO/IEC, 1994), MPEG-4 (ISO/IEC, 2000), Wave-Video (Fankhauser et al, 1999). Several filter techniques for specific media formats have been proposed and implemented during the last decade (Yeadon et al, 1996b;Yeadon et al, 1996a;Keller et al, 2000;Kassler et al, 2001). Recently, the MPEG-21 Digital Item Adaptation (DIA) standard (ISO/IEC, 2004) has defined a set of new tools for multimedia adaptation.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study of State-of-the-Art Adaptation Techniques for Scalable Multimedia Streams

Schorr¹,

Hauck

Feiten³

et al. 2006

Proceedings of the International Conference on Signal Processing and Multimedia Applications

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Stream adaptation is a key technology for enabling communication between heterogeneous multimedia devices and applications, possibly located in heterogeneous wired or wireless networks. Converting already compressed multimedia streams into a format suitable for a certain receiver terminal and network can be achieved by transcoding or by filtering of media streams. Transcoding allows more flexible adaptation operations but is in general a very CPU-intensive process. Therefore, scalable media formats have been developed, which allow more efficient adaptation of media streams through media filtering. Several filter techniques for specific media formats have been proposed and implemented during the last decade. Recently, the MPEG-21 Digital Item Adaptation standard has defined a set of new tools for multimedia adaptation. In this paper, we provide a comparative study of several adaptation techniques for scalable multimedia streams. We compare generic MPEG-21-based adaptation techniques with filter mechanisms for specific media formats with respect to the required processing resources and scalability. We also compare filter techniques with stream adaptation through transcoding. Moreover, we compare how adaptation of multiple media streams performs on systems with single-core and with multi-core processors.

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<title>Continuous media filters for heterogeneous internetworking</title>

Cited by 29 publications

References 19 publications

Filters: QoS support mechanisms for multipeer communications

Filters: QoS support mechanisms for multipeer communications

A joint signal processing and cryptographic approach to multimedia encryption

A Comparative Study of State-of-the-Art Adaptation Techniques for Scalable Multimedia Streams

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