The Experts below are selected from a list of 16098 Experts worldwide ranked by ideXlab platform
Gabriel-miro Muntean - One of the best experts on this subject based on the ideXlab platform.
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socially aware mobile peer to peer communications for community Multimedia Streaming services
IEEE Communications Magazine, 2015Co-Authors: Shijie Jia, Lujie Zhong, Gabriel-miro MunteanAbstract:Mobile Multimedia Streaming services have become the main reason behind the latest increase in mobile data traffic worldwide. The enormous user base, frequency of data exchange, and demand for high-quality Multimedia content open up new challenges to offer good QoS levels in mobile Multimedia Streaming systems. This article presents an innovative SMMC that integrates performance factors with aspects such as demand, socialization, mobility, and delivery. Simulation results demonstrate that SMMC achieves high content sharing efficiency and increased QoS levels.
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subjective assessment of region of interest aware adaptive Multimedia Streaming quality
IEEE Transactions on Broadcasting, 2009Co-Authors: Bogdan Ciubotaru, Gheorghita Ghinea, Gabriel-miro MunteanAbstract:Adaptive Multimedia Streaming relies on adjusting the video content's bit-rate meet network conditions in the quest to reduce packet loss and resulting video quality degradations. Current Multimedia adaptation schemes uniformly adjust the compression over the entire image area. However, research has shown that user attention is focused mostly on certain image areas, denoted areas of maximum user interest (AMUI), and their interest decreases with the increase in distance to the AMUI. The region of interest-based adaptive Multimedia Streaming scheme (ROIAS) is introduced to perform bit-rate adaptation to network conditions by adjusting video quality relative to the AMUI location. This paper also extends ROIAS to support multiple areas of maximum user interest within the same video frame. This paper presents the performance analysis of ROIAS in terms of the impact on user perceived video quality measured using subjective video quality assessment techniques based on human subjects. The tests use a wide range of video clips, which differ in terms of spatial and temporal complexity and region of interest location and variation. A comparative evaluation of both subjective and objective video quality test results is performed and demonstrate the benefit of using ROIAS for adaptive video quality delivery.
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ICME - An eye-tracking-based adaptive Multimedia Streaming scheme
2009 IEEE International Conference on Multimedia and Expo, 2009Co-Authors: Gheorghita Ghinea, Gabriel-miro MunteanAbstract:Tranditionally, adaptive Multimedia Streaming schemes aim to adjust features such as bandwidth to respond to changing network conditions, in the hope the the user perceptual impact of any quality loss is, if not unnoticed, minimised. However, current solutions equally affect the whole viewing area of the Multimedia frames, despite research showing that there are regions of the frame which are perceptually more relevant than others. This paper presents a novel eye-tracking-based adaptive scheme (ETAS) for Multimedia Streaming that performs transmission-related quality adjustments by selectively degrading the quality of those regions of the viewers are the least interested in, leaving perceptually relevant regions unchanged.
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Region of Interest-Based Adaptive Multimedia Streaming Scheme
IEEE Transactions on Broadcasting, 2008Co-Authors: Gabriel-miro Muntean, Gheorghita Ghinea, T.n. SheehanAbstract:Adaptive Multimedia Streaming aims at adjusting the transmitted content based on the available bandwidth such as losses that often severely affect the end-user perceived quality are minimized and consequently the transmission quality increases. Current solutions affect equally the whole viewing area of the Multimedia frames, despite research showing that there are regions on which the viewers are more interested in than on others. This paper presents a novel region of interest-based adaptive scheme (ROIAS) for Multimedia Streaming that when performing transmission-related quality adjustments, selectively affects the quality of those regions of the image the viewers are the least interested in. As the quality of the regions the viewers are the most interested in will not change (or will involve little change), the proposed scheme provides higher overall end-user perceived quality than any of the existing adaptive solutions.
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adaptive buffer power save mechanism for mobile Multimedia Streaming
International Conference on Communications, 2007Co-Authors: Janet Adams, Gabriel-miro MunteanAbstract:Wireless networks are becoming a part of everyday life for many people. When a mobile device has wireless LAN capability, Multimedia content can be streamed over a wireless network to that device. However, a major disadvantage of all mobile devices is their limited battery lifetime. Multimedia Streaming puts extra pressure on the battery, causing it to discharge faster. In some cases, Streaming tasks cannot be completed purely because the battery of the device becomes fully discharged, which causes significant user dissatisfaction. Consequently, it is necessary to devise mechanisms to enable longer battery lifetime in order to support complex applications such as those involving mobile Multimedia Streaming. This paper proposes an adaptive-buffer power save mechanism (AB-PSM) for increasing the battery life of mobile devices during Multimedia Streaming. This increase is achieved by controlling how and when data is sent over a wireless LAN. AB-PSM introduces an additional buffer which hides data from the station it is intended for, allowing it to return to sleep and consequently saving power. Data is eventually delivered in one of the station's following attempts to receive it. Tests involving AB-PSM have been performed and show good results in terms of significant increases in battery lifetime. The comparison between AB-PSM and the IEEE 802.11 legacy power save mechanism shows important increases in battery lifetime of more than 100%.
Martin Reisslein - One of the best experts on this subject based on the ideXlab platform.
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a survey of Multimedia Streaming in wireless sensor networks
IEEE Communications Surveys and Tutorials, 2008Co-Authors: Satyajayant Misra, Martin ReissleinAbstract:A wireless sensor network with Multimedia capabilities typically consists of data sensor nodes, which sense, for instance, sound or motion, and video sensor nodes, which capture video of events of interest. In this survey, we focus on the video encoding at the video sensors and the real-time transport of the encoded video to a base station. Real-time video streams have stringent requirements for end-to-end delay and loss during network transport. In this survey, we categorize the requirements of Multimedia traffic at each layer of the network protocol stack and further classify the mechanisms that have been proposed for Multimedia Streaming in wireless sensor networks at each layer of the stack. Specifically, we consider the mechanisms operating at the application, transport, network, and MAC layers. We also review existing cross-layer approaches and propose a few possible cross-layer solutions to optimize the performance of a given wireless sensor network for Multimedia Streaming applications.
Eun Jung Kim - One of the best experts on this subject based on the ideXlab platform.
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bandwidth estimation in wireless lans for Multimedia Streaming services
Advances in Multimedia, 2007Co-Authors: Heung Ki Lee, Varrian Hall, Ki Hwan Yum, Kyoung Ill Kim, Eun Jung KimAbstract:The popularity of Multimedia Streaming services via wireless networks presents major challenges in the management of network bandwidth. One challenge is to quickly and precisely estimate the available bandwidth for the decision of Streaming rates of layered and scalable Multimedia services. Previous studies based on wired networks are too burdensome to be applied to Multimedia applications in wireless networks. In this paper, a new method, IdleGap, is suggested to estimate the available bandwidth of a wireless LAN based on the information from a low layer in the protocol stack. We use a network simulation tool, NS-2, to evaluate our new method with various ranges of cross-traffic and observation times. Our simulation results show that IdleGap accurately estimates the available bandwidth for all ranges of cross-traffic (100 Kbps ∼ 1 Mbps) with a very short observation time of 10 seconds.
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bandwidth estimation in wireless lans for Multimedia Streaming services
International Conference on Multimedia and Expo, 2006Co-Authors: Heung Ki Lee, Varrian Hall, Ki Hwan Yum, Kyoung Ill Kim, Eun Jung KimAbstract:The popularity of Multimedia Streaming services via wireless networks presents major challenges in the management of network bandwidth. One challenge is to quickly and precisely estimate the available bandwidth for the decision of Streaming rates of layered and scalable Multimedia services. Previous works based on wired networks are too burdensome to be applied to Multimedia applications in wireless networks. In this paper, a new method, IdleGap, is suggested to estimate the available bandwidth of a wireless LAN based on the information from a low layer in the protocol stack. We use a network simulation tool, NS-2, to evaluate our new method with various range of cross traffic and observation times. Our simulation results show that IdleGap accurately estimates the available bandwidth for all ranges of cross traffic (100Kbps ~ 1Mbps) with a very short observation time of 10 seconds.
Satyajayant Misra - One of the best experts on this subject based on the ideXlab platform.
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a survey of Multimedia Streaming in wireless sensor networks
IEEE Communications Surveys and Tutorials, 2008Co-Authors: Satyajayant Misra, Martin ReissleinAbstract:A wireless sensor network with Multimedia capabilities typically consists of data sensor nodes, which sense, for instance, sound or motion, and video sensor nodes, which capture video of events of interest. In this survey, we focus on the video encoding at the video sensors and the real-time transport of the encoded video to a base station. Real-time video streams have stringent requirements for end-to-end delay and loss during network transport. In this survey, we categorize the requirements of Multimedia traffic at each layer of the network protocol stack and further classify the mechanisms that have been proposed for Multimedia Streaming in wireless sensor networks at each layer of the stack. Specifically, we consider the mechanisms operating at the application, transport, network, and MAC layers. We also review existing cross-layer approaches and propose a few possible cross-layer solutions to optimize the performance of a given wireless sensor network for Multimedia Streaming applications.
Kern Koh - One of the best experts on this subject based on the ideXlab platform.
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Parallel and Distributed Computing and Networks - Playback pattern aware interval caching for Multimedia Streaming systems
Parallel and distributed computing and networks, 2007Co-Authors: Oh-hoon Kwon, Hyokyung Bahn, Kern KohAbstract:In this work, we present a novel caching scheme, PAIC, which is designed for Multimedia Streaming systems. Caching in a Multimedia Streaming system is an effective way to improve the performance of Multimedia Streaming systems and reduce the service latency. Previous studies have shown that request interval based caching and its extension for considering different video popularity performs well for various Streaming environments. Although there are many studies for Multimedia Streaming system, they do not consider the playback pattern of the Streaming service. In this paper, we present the new caching scheme that considers the playback pattern of the Streaming service. Trace driven simulations with real world VOD traces have shown that the proposed caching scheme improves the performance of the Multimedia Streaming systems.
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Considering User Behavior and Multiple QoS Supports in Multimedia Streaming Caching
2007Co-Authors: Taeseok Kim, Hyokyung Bahn, Kern KohAbstract:With the prevalence of video-on-demand (VOD) services as well as the diffusion of various Multimedia devices, caching in a Multimedia Streaming server is becoming increasingly important. However, due to some peculiar characteristics of Multimedia objects and user activities in Streaming services, design of an efficient caching system becomes a more challenging problem compared to the traditional caching systems. This paper discusses some important issues that are of interest in the domain of Multimedia Streaming caching and presents a new cache management scheme for Multimedia Streaming servers. Our new scheme considers different Streaming rates of Multimedia objects as well as the inter-arrival time between two consecutive requests on an identical object. It also considers user activities in requesting and playing Multimedia contents. Trace-driven simulations with real world VOD traces show that the proposed scheme improves the performance of Multimedia Streaming systems significantly.
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Efficient cache management for QoS adaptive Multimedia Streaming services
Lecture Notes in Computer Science, 2005Co-Authors: Taeseok Kim, Hyokyung Bahn, Kern KohAbstract:With the recent advances in the wireless network technologies as well as the explosive usage of small handheld appliances, Multimedia Streaming services for these appliances have become increasingly important. Caching in a Multimedia Streaming server is an effective way to improve the performance of Streaming systems and reduce the service latency. In this paper, we propose a new Multimedia data cache management scheme for different digital Multimedia devices such as set-top box, personal digital assistants, etc. Our new scheme exploits the reference popularity of Multimedia objects as well as the inter-arrival time between two consecutive requests on an identical object. It also considers the Streaming rate of objects to provide QoS (quality of service) adaptive Streaming service for various appliances. Through trace-driven simulations, we show that the proposed scheme improves the performance of Multimedia Streaming systems significantly.
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PCM (2) - Efficient cache management for qos adaptive Multimedia Streaming services
Advances in Multimedia Information Processing - PCM 2005, 2005Co-Authors: Taeseok Kim, Hyokyung Bahn, Kern KohAbstract:With the recent advances in the wireless network technologies as well as the explosive usage of small handheld appliances, Multimedia Streaming services for these appliances have become increasingly important. Caching in a Multimedia Streaming server is an effective way to improve the performance of Streaming systems and reduce the service latency. In this paper, we propose a new Multimedia data cache management scheme for different digital Multimedia devices such as set-top box, personal digital assistants, etc. Our new scheme exploits the reference popularity of Multimedia objects as well as the inter-arrival time between two consecutive requests on an identical object. It also considers the Streaming rate of objects to provide QoS (quality of service) adaptive Streaming service for various appliances. Through trace-driven simulations, we show that the proposed scheme improves the performance of Multimedia Streaming systems significantly.