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Downlink beamforming for DS-CDMA mobile radio with multimedia services

IEEE TRANSACTIONS ON COMMUNICATIONS 2001年第7期49卷 1288-1298页

作者： Liang, YC Chin, FPS Liu, KJR Ctr Wireless Commun Singapore 117674 Singapore Univ Maryland Dept Elect Engn College Pk MD 20742 USA Univ Maryland Syst Res Inst College Pk MD 20742 USA

Downlink beamforming is a promising technique for direct-sequence code-division multiple-access (DS-CDMA) systems with multimedia services to effectively reduce strong interferences induced by high data rate users. In this paper, a new downlink beamforming technique is proposed that converts downlink beamforming problem into a virtual uplink one and takes into account of the data rate information of all users. Since the main complexity of this method is due to the existence of multidelay paths, two simplified algorithms are suggested using equivalent one-path channel vector to replace multipath channel vectors. Computer simulation results are given to evaluate downlink capacity of DS-CDMA systems using base station antenna array and the new algorithms proposed in this paper.

关键词： adaptive beamforming code-division multiple access multimedia communications power control

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Towards a multimedia remote viewer for mobile thin clients

Towards a multimedia remote viewer for mobile thin clients

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

作者： Joveski, B. Simoens, P. Gardenghi, L. Marshall, J. Mitrea, M. Vankeirsbilck, B. Preteux, F. Dhoed, B. TELECOM SudParis Inst TELECOM ARTEMIS Dept Evry France IBBT Ghent Belgium Univ Ghent Ghent Belgium Prologue Software Gennevilliers France MINES ParisTech Paris France

ISBN: (纸本)9780819484185

Be there a traditional mobile user wanting to connect to a remote multimedia server. In order to allow them to enjoy the same user experience remotely (play, interact, edit, store and share capabilities) as in a traditional fixed LAN environment, several dead-locks are to be dealt with: (1) a heavy and heterogeneous content should be sent through a bandwidth constrained network;(2) the displayed content should be of good quality;(3) user interaction should be processed in real-time and (4) the complexity of the practical solution should not exceed the features of the mobile client in terms of CPU, memory and battery. The present paper takes this challenge and presents a fully operational MPEG-4 BiFS solution.

关键词： remote viewer multimedia mobile thin clients BiFS

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Comparative study of autostereoscopic displays for mobile devices

Comparative study of autostereoscopic displays for mobile de...

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

作者： Boev, Atanas Gotchev, Atanas Tampere Univ Technol Dept Signal Proc FI-33101 Tampere Finland

ISBN: (纸本)9780819484185

We perform comparative analysis of the visual quality of multiple 3D displays - seven portable ones, and a large 3D television set. We discuss two groups of parameters that influence the perceived quality of mobile 3D displays. The first group is related with the optical parameters of the displays, such as crosstalk or size of sweet spots. The second group includes content related parameters, such as objective and subjective comfort disparity range, suitable for a given display. We identify eight important parameters to be measured, and for each parameter we present the measurement methodology, and give comparative results for each display. Finally, we discuss the possibility of each display to visualize downscaled stereoscopic HD content with sufficient visual quality.

关键词： portable 3D displays parallax barrier lenticular sheet light guide HDDP crosstalk accommodation-convergence rivalry comfort disparity range subjective quality downscaled stereoscopic content

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Distributed classifier chain optimization for real-time multimedia stream mining systems - art. no. 68200N

Distributed classifier chain optimization for real-time mult...

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conference on multimedia content access - algorithms and systems II

作者： Foo, Brian van der Schaar, Mihaela Univ Calif Los Angeles Dept Elect Engn Los Angeles CA 90095 USA

ISBN: (纸本)9780819469922

We consider the problem of optimally configuring classifier chains for real-time multimedia stream mining systems. Jointly maximizing the performance over several classifiers under minimal end-to-end processing delay is a difficult task due to the distributed nature of analytics (e.g. utilized models or stored data sets), where changing the filtering process at a single classifier can have an unpredictable effect on both the feature values of data arriving at classifiers further downstream, as well as the end-to-end processing delay. While the utility function can not be accurately modeled, in this paper we propose a randomized distributed algorithm that guarantees almost, sure convergence to the optimal solution. We also provide results using speech data showing that the algorithm can perform Well under highly dynamic environments.

关键词： distributed systems queuing theory multimedia stream mining multiagent systems

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Swimmer Detection and Pose Estimation for Continuous Stroke Rate Determination

Swimmer Detection and Pose Estimation for Continuous Stroke ...

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

作者： Zecha, Dan Greif, Thomas Lienhart, Rainer Univ Augsburg Multimedia Comp Lab Augsburg Germany

ISBN: (纸本)9780819489517

In this work we propose a novel approach to automatically detect a swimmer and estimate his/her pose continuously in order to derive an estimate of his/her stroke rate given that we observe the swimmer from the side. We divide a swimming cycle of each stroke into several intervals. Each interval represents a pose of the stroke. We use specifically trained object detectors to detect each pose of a stroke within a video and count the number of occurrences per time unit of the most distinctive poses (so-called key poses) of a stroke to continuously infer the stroke rate. We extensively evaluate the overall performance and the influence of the selected poses for all swimming styles on a data set consisting of a variety of swimmers.

关键词： Object detection pose estimation stroke rate estimation swimming channel

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Recognizing persons in images by learning from videos

Recognizing persons in images by learning from videos

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conference on multimedia content access - algorithms and systems

作者： Hoerster, Eva Lux, Jochen Lienhart, Rainer Univ Augsburg Multimedia Comp Lab D-8900 Augsburg Germany

ISBN: (纸本)9780819466198

In this paper, we propose an approach for automatically, recognizing persons in images based on their general outer appearance. Therefore we build a statistical model for each person. Large amounts of training data are collected and labeled automatically by using a visual sensor array capturing image sequences containing the person to be learnt. Foreground-background segementation is performed to seperate the person from background, thus enabeling to learn the persons appearance independent of the background. Color and gradient features are extracted representing the segmented person. Person recognition of incoming photos is carried out using (k)-Nearest Neighbor(s) classification and the normalized histogram intersection match value is used as distance measure. Reported experimental results show that the presented approach performs well.

关键词： object recognition object identification person recognition person identification

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Storage format for personalized broadcasting content consumption

Storage format for personalized broadcasting content consump...

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conference on multimedia content access - algorithms and systems

作者： Jin, Sung Ho Jang, Jea-Seok Min, Hyun-Seok Ro, Yong Man Kim, Hui Yong Informat & Commun Univ Image & Video Syst Lab 119 Munjiro Taejon 305732 South Korea Elect & Telecommun Res Inst Broadcasting Media Res Grp Daejeon South Korea

ISBN: (纸本)9780819466198

In this paper, we propose a storage format which binds digital broadcasts with related data such as TV-Anytime metadata, additional multimedia resources, and personal viewing history. The goal of the proposed format is to make it possible to offer personalized content consumption after recording broadcasting contents to storage devices, e.g., HD-DVD and Blu-ray Disc. TO achieve that, we adopt MPEG-4 file format as a container and apply a binary format for scenes (BIFS) for representing and rendering personal viewing history. In addition, TV-Anytime metadata is used to describe broadcasts and to refer to the additional multimedia resources, e.g, images, audio clips, and short video clips. To demonstrate the usefulness of the proposed format, we introduce an application scenario and test it on that scenario.

关键词： storage format broadcasting content TV-anytime metadata MPEG-4 file format BIFS

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Did the Super Bowl Kill the Internet?

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IEEE access 2017年 5卷 9812-9822页

作者： Morales, Nestor Bergstrom, Mattias System73 Santa Cruz De Tenerife Spain

Given the rapid increase in Internet streaming services to access multimedia content, to the detriment of traditional cable, satellite, and terrestrial, it is to be expected that this traffic will affect the performance of the Internet at several levels. One such level is the communication between autonomous systems that is primarily based on border gateway protocol (BGP). In order to understand this impact, a tool was developed to detect the problems that occur during a specific time period. This tool is able to identify and classify flapping events providing information about the networks potentially involved in the disruptions. The main focus of this paper is the analysis of the BGP updates registered during Super Bowl 2016 in order to understand how a large streaming event affects the Internet at the BGP level. Those results show that an increase in the number of updates happened during key times when a large number of concurrent viewers connected to the game. Many dampening and flapping events were observed accordingly. From those events, networks potentially affected were detected and categorized. The results of our study suggest that the Internet is not prepared to accommodate the potential streaming traffic generated during major events. This is of utmost importance for content providers and content delivery networks in designing their broadcast strategies which should take into consideration not only the scalability of their own servers but also the way in which data reaches the viewer.

关键词： Broadcast technology Internet topology multimedia communication border gateway protocol super bowl quality of experience BGP flapping classification algorithms

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multimedia summaries of broadcast news

Multimedia summaries of broadcast news

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conference on Intelligent Information systems (IIS 97)

作者： Maybury, MT Merlino, AE Mitre Corp Adv Informat Syst Ctr Bedford MA 01730 USA

ISBN: (纸本)0818682183

Increasing amounts of text, audio, and video content has fueled efforts to provide direct, content based access to these materials. Summaries are often necessary to enable timely relevancy assessments, information extraction, or information analysis from source material. Whereas text summarization research is receiving increasing attention, comparatively few investigators have examined video summarization. This paper reports on the extension of a broadcast news access system to provide multimedia summaries. We briefly overview our system for video analysis, focusing on our novel integration of image, speech and language processing techniques to support automated video summarization. We outline algorithms for proper name and keyphrase extraction, story segmentation, and key frame extraction which together underpin our current ability to automatically summarize video. We describe the systems ability to generate multimedia video summaries tailored to a user query. We discuss evaluation metrics for measuring the (quality) value of these summary artifacts.

关键词： content-based video access video summarization broadcast news

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content-based image retrieval using greedy routing

Content-based image retrieval using greedy routing

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conference on multimedia content access - algorithms and systems II

作者： Don, Anthony Hanusse, Nicolas Univ Bordeaux 1 LaBRI F-33405 Talence France

ISBN: (纸本)9780819469922

In this paper, we propose a new concept for browsing and searching in large collections of content-based indexed images. Our approach is inspired by greedy routing algorithms used in distributed networks. We define a navigation graph, called NAVGRAPH, whose vertices represent images. The edges of the navgraph are computed according to a similarity measure between indexed images. The resulting graph can be seen as an ad-hoc network of images in which a greedy routing algorithm can be applied for retrieval purposes. A request for a target image consists of a walk in the navigation graph using a greedy,approach : starting from an arbitrary vertex/image, the neighbors of the current vertex are presented to the user, who iteratively selects the vertex which is the most similar to the target. We present the NAVGRAPH construction and prove its efficiency for greedy routing. We also propose a specific content-descriptor that we compare to the MPEG7 Color Layout Descriptor. Experimental results with test-users show the usability of this approach.

关键词： CBIR user interface greedy routing navigation graphs

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