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作者： Raychaudhuri, Dipankar Mandayam, Narayan B. WINLAB Rutgers University Technology Centre of NJ North Brunswick NJ 08902 United States

The field of wireless and mobile communication has a remarkable history that spans over a century of technology innovations from Marconi's first transatlantic transmission in 1899 to the worldwide adoption of cellular mobile services by over four billion people today. Wireless has become one of the most pervasive core technology enablers for a diverse variety of computing and communications applications ranging from third-generation/fourth-generation (3G/4G) cellular devices, broadband access, indoor WiFi networks, vehicle-to-vehicle (v2v) systems to embedded sensor and radio-frequency identification (RFID) applications. This has led to an accelerating pace of research and development in the wireless area with the promise of significant new breakthroughs over the next decade and beyond. This paper provides a perspective of some of the research frontiers of wireless and mobile communications, identifying early stage key technologies of strategic importance and the new applications that they will enable. Specific new radio technologies discussed include dynamic spectrum access (DSA), white space, cognitive software-defined radio (SDR), antenna beam steering and multiple-input-multiple- output (MIMO), 60-GHz transmission, and cooperative communications. Taken together, these approaches have the potential for dramatically increasing radio link speeds from current megabit per second rates to gigabit per second, while also improving radio system capacity and spectrum efficiency significantly. The paper also introduces a number of emerging wireless/mobile networking concepts including multihoming, ad hoc and multihop mesh, delay-tolerant routing, and mobile content caching, providing a discussion of the protocol capabilities needed to support each of these usage scenarios. In conclusion, the paper briefly discusses the impact of these wireless technologies and networking techniques on the design of emerging audiovisual and multimedia applications as they migrate to mobile

关键词： Cognitive radio

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Energy-Efficient Multicasting of Multiview 3D videos to mobile devices

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ACM TRANSACTIONS ON multimedia COMPUTING COMMUNICATIONS AND APPLICATIONS 2012年第3期8卷 45-45页

作者： Hamza, Ahmed Hefeeda, Mohamed Simon Fraser Univ 102nd Ave Survey BC V3T 0A3 Canada

Multicasting multiple video streams over wireless broadband access networks enables the delivery of multimedia content to large-scale user communities in a cost-efficient manner. Three dimensional (3D) videos are the next natural step in the evolution of digital media technologies. In order to provide 3D perception, 3D video streams contain one or more views that greatly increase their bandwidth requirements. Due to the limited channel capacity and variable bit rate of the videos, multicasting multiple 3D videos over wireless broadband networks is a challenging problem. In this article, we consider a 4G wireless access network in which a number of 3D videos represented in two-view plus depth format and encoded using scalable video coders are multicast. We formulate the optimal 3D video multicasting problem to maximize the quality of rendered virtual views on the receivers' displays. We show that this problem is NP-complete and present a polynomial time approximation algorithm to solve it. We then extend the proposed algorithm to efficiently schedule the transmission of the chosen substreams from each video in order to maximize the power saving on the mobile receivers. Our simulation-based experimental results show that our algorithm provides solutions that are within 0.3 dB of the optimal solutions while satisfying real-time requirements of multicast systems. In addition, our algorithm results in an average power consumption reduction of 86%.

关键词： Design multimedia networking energy saving wireless networks 3D video WiMAX LTE

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Forensic investigation of certain types of mobile devices

Forensic investigation of certain types of mobile devices

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Conference on multimedia on mobile devices and multimedia content access - algorithms and systems v

作者： Luttenberger, Silas Creutzburg, Reiner Univ Appl Sci Fach Hsch Brandenburg Dept Informat & Media D-14770 Brandenburg Germany

ISBN: (纸本)9780819484185

The aim of this paper is to show the usefulness of Windows based Open Source Tools and other demo versions of software tools for forensic investigation of modern mobile devices. It is demonstrated how important data stored in the mobile device are investigated. Different scenarios of investigations are presented that are well-suited for a inexpensive forensics lab work in university. In particular the forensic investigation of three different cell phones is described: Motorola v3m, Motorola v3i, and BlackBerry 8700g(10).

关键词： Cell phone forensics forensics for mobile devices cell phone mobile phone forensics

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multimedia Information Retrieval at FX Palo Alto Laboratory

Multimedia Information Retrieval at FX Palo Alto Laboratory

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Conference on multimedia on mobile devices and multimedia content access - algorithms and systems v

作者： Cooper, Matthew Adcock, John Girgensohn, Andreas Pickens, Jeremy Wilcox, Lynn FX Palo Alto Lab Palo Alto CA 94034 USA

ISBN: (纸本)9780819484185

This paper describes research activities at FX Palo Alto Laboratory (FXPAL) in the area of multimedia browsing, search, and retrieval. We first consider interfaces for organization and management of personal photo collections. We then survey our work on interactive video search and retrieval. Throughout we discuss the evolution of both the research challenges in these areas and our proposed solutions.

关键词： video visualization multimedia Human-machine interfaces Interfaces Digital photography Internet Photography Document management mobile devices

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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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iPhone forensics based on Macintosh open source and freeware tools

iPhone forensics based on Macintosh open source and freeware...

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Conference on multimedia on mobile devices and multimedia content access - algorithms and systems v

作者： Hoene, Thomas Creutzburg, Reiner Univ Appl Sci Fach Hsch Brandenburg Dept Informat & Media D-14770 Brandenburg Germany

ISBN: (纸本)9780819484185

The aim of this article is to show the usefulness of Mac OS X based open source tools for forensic investigation of modern iPhones. It demonstrates how important data stored in the iPhone is investigated. Two different scenarios of investigations are presented that are well-suited for a forensics lab work in university. This work shows how to analyze an Apple iPhone using open source and freeware tools. Important data used in a forensics investigation, which are possibly stored on a mobile device are presented. Also the superstructure and functions of the iPhone are explained.

关键词： Apple iPhone iPhone forensics mobile forensics Mac OS X forensics

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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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Spatially Organized visualization of Image Query Results

Spatially Organized Visualization of Image Query Results

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Conference on multimedia on mobile devices and multimedia content access - algorithms and systems v

作者： Ciocca, Gianluigi Cusano, Claudio Santini, Simone Schettini, Raimondo Univ Milano Bicocca Viale Sarca 336 I-20126 Milan Italy

ISBN: (纸本)9780819484185

In this work we present a system which visualizes the results obtained from image search engines in such a way that users can conveniently browse the retrieved images. The way in which search results are presented allows the user to grasp the composition of the set of images "at a glance". To do so, images are grouped and positioned according to their distribution in a prosemantic feature space which encodes information about their content at an abstraction level that can be placed between visual and semantic information. The compactness of the feature space allows a fast analysis of the image distribution so that all the computation can be performed in real time.

关键词： Image retrieval content-based image analysis image browsing

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Overcome the shortcoming in mobile stereoscopy

Overcome the shortcoming in mobile stereoscopy

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Conference on multimedia on mobile devices and multimedia content access - algorithms and systems v

作者： Lee, Kwang-Hoon Kim, Sung-Kyu Konkuk Univ Dept Adv Technol Fus Seoul South Korea KIST Imaging Media Res Ctr Seoul South Korea

ISBN: (纸本)9780819484185

The mobile device has the lacked space for configuring cameras to make either ortho- or hyperstereoscopic condition with a small size of display. Therefore mobile stereoscopy cannot provide a presence with a good depth sense to an observer. To solve this problem, we focused on the depth sense control method with a switchable stereo camera alignment. In converging type, the fusible stereo area becomes wider compared to a parallel type when the same focal length was used in both types. This matter makes it that the stereo fusible area formed by converging type to be equal to the parallel type with a more shorten focal length. Therefore there is a kind of the zoom-out effect at the reconstructed depth sense. In diverging type, the fusible stereo area becomes narrower than the parallel. As the same way, the diverging type guarantees a similar characteristic of that an increased focal length is considered in parallel type. Therefore there is a zoom-in effect existing. Stereoscopic zoom-in depth effect becomes rapidly changed by the increased angle but zoom-out becomes retarded relatively.

关键词： Stereoscopic cameras Cameras Sensors Stereoscopy Distributed interactive simulations Image processing Imaging systems mobile devices Image sensors multimedia

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User-provided multimedia content distribution architecture in mobile and ubiquitous communication networks

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JOURNAL OF NETWORK AND COMPUTER APPLICATIONS 2011年第1期34卷 121-136页

作者： Hu, Chih-Lin Cho, Chien-An Natl Cent Univ Dept Commun Engn Jung Li City 32001 Taoyuan Taiwan

The network convergence of wired, wireless, and mobile systems creates a ubiquitous network environment where modern networking devices feature multiple networking interfaces and can connect to different networks simultaneously. mobile users in ubiquitous networks expect to access information services anytime, and from anywhere. This paper presents a mobile content sharing scenario in which a networked device can discover neighboring devices and share multimedia content in a convenient, networked manner. This ideal scenario differs from the traditional usage which requires the tedious manual operations of connection setup and file transfer. To achieve this goal, this study proposes a user-provided multimedia content distribution architecture for a mobile and ubiquitous network environment. The proposed architecture integrates several specific mechanisms, including device discovery, asynchronous content delivery, secure access control, and virtual file system. This design addresses several inherent limitations in wireless and mobile networks, and enables mobile users to transfer media content in a secure, mobile, and energy-saving way. The proof-of-concept prototype and performance evaluation in this study confirm that the proposed architecture not only provides better user experience, but also achieves a lightweight design without compromising performance. (C) 2010 Elsevier Ltd. All rights reserved.

关键词： Device discovery mobile content delivery mobile application multimedia distribution Ubiquitous computing

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