Current Issue : April - June Volume : 2013 Issue Number : 2 Articles : 5 Articles
While video content is often stored in rather large files or broadcasted in continuous streams, users are often interested in retrieving\r\nonly a particular passage on a topic of interest to them. It is, therefore, necessary to split video documents or streams into\r\nshorter segments corresponding to appropriate retrieval units. We propose here a method for the automatic segmentation of TV\r\nnews videos into stories. A-multiple-descriptor based segmentation approach is proposed. The selected multimodal features are\r\ncomplementary and give good insights about story boundaries. Once extracted, these features are expanded with a local temporal\r\ncontext and combined by an early fusion process. The story boundaries are then predicted using machine learning techniques.We\r\ninvestigate the system by experiments conducted using TRECVID 2003 data and protocol of the story boundary detection task,\r\nand we show that the proposed approach outperforms the state-of-the-art methods while requiring a very small amount of manual\r\nannotation....
The content-rich multimedia streaming will be the most attractive services in the next-generation networks. With function of\r\ndistribute data across multipath end-to-end paths based on SCTP�s multihoming feature, concurrent multipath transfer SCTP\r\n(CMT-SCTP) has been regarded as the most promising technology for the efficient multimedia streaming transmission. However,\r\nthe current researches on CMT-SCTP mainly focus on the algorithms related to the data delivery performance while they seldom\r\nconsider the background traffic factors. Actually, background traffic of realistic network environments has an important impact on\r\nthe performance of CMT-SCTP. In this paper, we firstly investigate the effect of background traffic on the performance of CMTSCTP\r\nbased on a close realistic simulation topology with reasonable background traffic in NS2, and then based on the localness\r\nnature of background flow, a further improved retransmission algorithm, named RTX CSI, is proposed to reach more benefits in\r\nterms of average throughput and achieve high users� experience of quality for multimedia streaming services....
The subject of the future of the interactive Television medium has become a topic of great interest to the academic and industrial\r\ncommunities particularly since in the recent years there has been a dramatic increase in the pace of innovation of convergence of\r\ndigital TV systems and services. The purpose of this paper is to provide a brief overview of what we know as digital TV converged\r\nservices, to present and categorise the digital Television middleware technologies that contributed to it, and to present possible\r\nfuture trends and directions. A new Television era of converged wireless and mobile content delivery, user-authored content,\r\nmultimodal interaction, intelligent personalisation, smart space awareness, and 3D content sensations is foreseen, creating ambient\r\nand immersive experiences....
Adaptive Coding and Modulation (ACM) is a feature incorporated into the DVB-S2 satellite specification, allowing real-time\r\nadaptation of transmission parameters according to the link conditions. Although ACM was originally designed for optimizing\r\nunicast services, this article discusses the expansion of its usage to broadcasting streams as well. For this purpose, a general crosslayer\r\nadaptation approach is proposed, along with its realization into a fully functional experimental network, and test results are\r\npresented. Finally, two case studies are analysed, assessing the gain derived by ACMin a real large-scale deployment, involving HD\r\nservices provision to two different geographical areas....
With the development of heterogeneous networks and video coding standards, multiresolution video applications over networks\r\nbecome important. It is critical to ensure the service quality of the network for time-sensitive video services.Worldwide Interoperability\r\nforMicrowave Access (WIMAX) is a good candidate for delivering video signals because through WIMAX the delivery quality\r\nbased on the quality-of-service (QoS) setting can be guaranteed. The selection of suitable QoS parameters is, however, not trivial\r\nfor service users. Instead, what a video service user really concerns with is the video quality of presentation (QoP) which includes\r\nthe video resolution, the fidelity, and the frame rate. In this paper, we present a quality control mechanism inmultiresolution video\r\ncoding structures over WIMAX networks and also investigate the relationship between QoP and QoS in end-to-end connections.\r\nConsequently, the video presentation quality can be simply mapped to the network requirements by a mapping table, and then the\r\nend-to-end QoS is achieved.We performed experiments withmultiresolutionMPEG coding over WIMAX networks. In addition to\r\nthe QoP parameters, the video characteristics, such as, the picture activity and the video mobility, also affect the QoS significantly....
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