In this paper we design and study the performance of a Multiple Access Control (MAC) scheme for the multiplexing and the integrated delivery of voice, mobile messaging, IP and H. 264 videoconference traffic over a hig...
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ISBN:
(纸本)9780769528892
In this paper we design and study the performance of a Multiple Access Control (MAC) scheme for the multiplexing and the integrated delivery of voice, mobile messaging, IP and H. 264 videoconference traffic over a high-speed next-generation cellular TDMA channel with errors and capture. To the best of our knowledge, this is one of the first papers in the literature investigating the integration of H. 264 video traffic with other types of traffic over wireless networks. Our results show that the proposed scheme achieves high throughput results while preserving the strict Quality of Service (QoS) requirements of each traffic type, and outperforms an efficient scheme previously proposed in the literature.
There are many challenging problems in multimedia research for which state-of-the-art solutions fall short of performing perfectly. The realization that many of these tasks are arduous for computers yet are relatively...
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ISBN:
(纸本)9789811033735;9789811033728
There are many challenging problems in multimedia research for which state-of-the-art solutions fall short of performing perfectly. The realization that many of these tasks are arduous for computers yet are relatively easy for humans has inspired many researchers to approach those problems from a human computation viewpoint, using methods that include crowdsourcing and games. This paper offers a discussion and advices how to use games to supplement traditional content analysis techniques and assist in the solution of hard multimedia problems.
A collabor ative system allow;a grou p of users to collaborate through a distr i buted platform in order to perform a c ommon task. These users may h av e conc urrent access to shared objec ts. In this contex t, acces...
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ISBN:
(纸本)9781467315203
A collabor ative system allow;a grou p of users to collaborate through a distr i buted platform in order to perform a c ommon task. These users may h av e conc urrent access to shared objec ts. In this contex t, access con trol becomes an important issue tha t must be addressed Access control models are des igned to pro tect shared information a nd resources, of any type and at different levels of granularity. In this work we present SOrBAC: an extension of OrBAC model, in order to provide a mechanism f or securing a dynamic collaborative Session. SOrBAC introduces a new level named Session level to the original OrBAC model. This session level introduces new entities to allow a dynamic access control during a collaborati ve session.
Continuous media, such as audio and video, are quickly becoming an integral part of distributed computing environments. A shortcoming of such environments is their lack of support for continuous flows of information. ...
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ISBN:
(纸本)0819420417
Continuous media, such as audio and video, are quickly becoming an integral part of distributed computing environments. A shortcoming of such environments is their lack of support for continuous flows of information. What is missing is the notion of an on-going communication activity with an associated quality of service. This paper describes a model for integrating multimedia flows into a distributed computing system. The model permits explicit bindings to be established between type-checked stream interfaces. The stream binding is represented in the computational model as a first-class object which encapsulates configuration rules and QoS attributes. An operational interface supplied by the binding object allows other objects within the system to manage the binding, to renegotiate QoS parameters, to control the flows across the binding, and to register interest in stream events such as flow reports and communication errors. The in-band stream interface is an abstract C++ wrapper around transport mechanisms that include intra-host IPC and network transport protocols such as TCP and XTP. A prototype implementation of this model is described using the Common Object Request Broker Architecture. The implementation environment comprises a local area ATM network with directly attached multimedia peripherals and general purpose workstations.
In packetized media streaming systems, packet dependencies are often modeled as a directed acyclic graph called the dependency graph. We consider the situation where the dependency graph is reducible to a tree. This o...
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ISBN:
(纸本)0819461113
In packetized media streaming systems, packet dependencies are often modeled as a directed acyclic graph called the dependency graph. We consider the situation where the dependency graph is reducible to a tree. This occurs, for instance, in MPEG1 video streams that are packetized at the frame level. Other video coding standards such as H.264 also allow tree-reducible dependencies. We propose in this context efficient dynamic programming algorithms for finding rate-distortion optimal transmission policies. The proposed algorithms are much faster than previous exact algorithms developed for arbitrary dependency graphs.
Satellite system can provide a high quality broadband communication services especially in the internet access and multimedia applications. In order to realize an optimized system design, a novel design concept for br...
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This paper Introduces an algorithm to detect the least significant bit (LSB) steganography in audio riles. Based on the sample pair analysis and the definition of complexity function in RS algorithm, the algorithm est...
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ISBN:
(纸本)9781424413119
This paper Introduces an algorithm to detect the least significant bit (LSB) steganography in audio riles. Based on the sample pair analysis and the definition of complexity function in RS algorithm, the algorithm estimates the length of hidden messages using the statistical characteristic of LSB of audio samples and steganalysis audio files through the estimated length of hidden messages. This algorithm has low computing complexity and is easy to he implemented. Experimental results and theoretical verification show that this method is an effective method of audio LSB steganalysis.
The proceedings contains 20 papers from the conference on Electronic Imaging : multimediacomputing and networking 2003. Topics discussed include: server transcoding of multimedia data for cross-disability access;qual...
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The proceedings contains 20 papers from the conference on Electronic Imaging : multimediacomputing and networking 2003. Topics discussed include: server transcoding of multimedia data for cross-disability access;quality of service monitoring in multimedia network;design and implementation of an active video distribution system;overlay caching scheme for overlay networks;and variable bandwidth broadcasting protocol for video-on-demand.
The usage of mobile phones has rapidly increased in the recent years. As the result of this, many companies have appeared at the markets that propose various services for mobile communication. Therefore, the customer&...
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ISBN:
(纸本)9781424406661
The usage of mobile phones has rapidly increased in the recent years. As the result of this, many companies have appeared at the markets that propose various services for mobile communication. Therefore, the customer's choice of the telephone provider depends both on the cost policy and the proposed services of the companies. In our work, innovative services for providers are introduced. They implement both centralized and decentralized control of mobile phones by having access to the kernel of the operating system running on the mobile phone. The delivery of multimedia contents to the mobile device can be done using one of the following options: direct communication between two mobile phones or indirect communication between two mobile phones via a server providing the multimedia content. This leads to an IP-based distributed multimedia mobile system in local and global areas. Our research in this field shows that mobile devices are comparable to any computer in the network that gives opportunity to download multimedia information. Our demonstration with client and server software will show the functional features of the developed system.
This paper discusses a communication model to exchange multimedia messages in a group of multiple processes. Quality of Service (QoS) required by an application has to be supported. In traditional communication protoc...
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ISBN:
(纸本)0769519067
This paper discusses a communication model to exchange multimedia messages in a group of multiple processes. Quality of Service (QoS) required by an application has to be supported. In traditional communication protocols like TCP, a process can reliably deliver messages to one or more than one process. In the group communication, a process sends messages to multiple processes while receiving messages from multiple processes in a group. We propose a notification-based data transmission procedure to exchange multimedia messages with processes so as to satisfy QoS requirement.
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