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IEEE COMMUNICATIONS MAGAZINE 2017年第2期55卷 106-113页

作者： Fadlallah, Yasser Tulino, Antonia M. Barone, Dario Vettigli, Giuseppe Llorca, Jaime Gorce, Jean-Marie INSA Lyon Lyon France Univ Sci & Arts Lebanon Beirut Lebanon Univ Naples Federico II Naples Italy Univ Naples Federico II Telecommun Engn Naples Italy Univ Naples Federico II Comp Sci Naples Italy Nokia Bell Labs Holmdel NJ USA Nokia Bell Labs Network Algorithms Grp Holmdel NJ USA

One of the major goals of the 5G technology roadrnap is to create disruptive innovation for the efficient use of the radio spectrum to enable rapid access to bandwidth-intensive multimedia services over wireless networks. The biggest challenge toward this goal lies in the difficulty in exploiting the multicast nature of the wireless channel in the presence of wireless users that rarely access the same content at the same time. Recently, the combined use of wireless edge caching and coded multicasting has been shown to be a promising approach to simultaneously serve multiple unicast demands via coded multicast transmissions, leading to order-of-magnitude bandwidth efficiency gains. I lowever, a crucial open question is how these theoretically proven throughput gains translate in the context of a practical implementation that accounts for all the required coding and protocol overheads. In this article, we first provide an overview of the emerging caching-aided coded multicast technique, including state-of-the-art schemes and their theoretical performance. We then focus on the most competitive scheme proposed to date and describe a fully working prototype implementation in CorteXlab, one of the few experimental facilities where wireless multiuser communication scenarios can be evaluated in a reproducible environment. We use our prototype implementation to evaluate the experimental performance of state-of-the-art caching-aided coded multicast schemes corn pared to state-of-the-art uncoded schemes, with special focus on the impact of coding computation and communication overhead on the overall bandwidth efficiency performance. Our experimental results show that coding overhead does not significantly affect the promising performance gains of coded multicasting in small-scale real world scenarios, practically validating its potential to become a key next generation CG technology.

关键词： 5G mobile communication Bandwidth Encoding Mobile computing Multicast communication Wireless communication

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A content-based methodology for power-aware motion estimation architecture

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IEEE TRANSACTIONS ON CIRCUITS AND systems ii-EXPRESS BRIEFS 2005年第10期52卷 631-635页

作者： Cheng, HW Dung, LR Natl Chiao Tung Univ Dept Elect & Control Engn Hsinchu 300 Taiwan

This paper presents a novel power-aware motion estimation algorithm, called adaptive content-based subsample algorithm (ACSA), for battery-powered multimedia devices. While the battery status changes, the architecture adaptively performs graceful tradeoffs between power consumption and compression quality. As the available energy decreases, the algorithm raises the subsample rate for maximizing battery lifetime. Differing from the existing subsample algorithms, the content-based algorithm first extracts edge pixels from a macro-block and then subsamples the remaining low-frequency part. In this way, we can alleviate the aliasing problem and thus keep the quality degradation low as the subsample rate increases. As shown in experimental results, the architecture can dynamically operate at different power consumption modes with little quality degradation according to the remaining capacity of battery pack while the power overhead of edge extraction is under 0.8%.

关键词： content-based image processing motion estimation (ME) power-aware system subsample algorithm very large-scale integration (VLSI) architecture video compression VLSI image processing

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Generic and optimized framework for multi-content analysis based on learning approaches

Generic and optimized framework for multi-content analysis b...

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Conference on Imaging and Printing in a Web 2.0 World;and multimedia content access - algorithms and systems IV

作者： Besnehard, Quentin Marchessoux, Cedric Kimpe, Tom Barco NV B-8500 Kortrijk Belgium

ISBN: (纸本)9780819479334

During the European Cantata project (ITEA project, 2006-2009), a Multi-content Analysis framework for the classification of compound images in various categories (text, graphical user interface, medical images, other complex images) was developed within Barco. The framework consists of six parts: a dataset, a feature selection method, a machine learning based Multi-content Analysis (MCA) algorithm, a Ground Truth, an evaluation module based on metrics and a presentation module. This methodology was built on a cascade of decision tree-based classifiers combined and trained with the AdaBoost meta-algorithm. In order to be able to train these classifiers on large training datasets without excessively increasing the training time, various optimizations were implemented. These optimizations were performed at two levels: the methodology itself (feature selection / elimination, dataset pre-computation) and the decision-tree training algorithm (binary threshold search, dataset presorting and alternate splitting algorithm). These optimizations have little or no negative impact on the classification performance of the resulting classifiers. As a result, the training time of the classifiers was significantly reduced, mainly because the optimized decision-tree training algorithm has a lower algorithmic complexity. The time saved through this optimized methodology was used to compare the results of a greater number of different training parameters.

关键词： Multi-content analysis machine learning AdaBoost decision trees optimization

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Harvesting weakly-tagged images for computer vision tasks

Harvesting weakly-tagged images for computer vision tasks

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Conference on Imaging and Printing in a Web 2.0 World;and multimedia content access - algorithms and systems IV

作者： Shen, Yi Yang, Chunlei Gao, Yuli Fan, Jianping UNC Charlotte Dept Comp Sci Charlotte NC USA HP Labs Multimedia Interact & Understand Lab Palo Alto CA USA

ISBN: (纸本)9780819479334

To crawl large amounts of weakly-tagged images for computer vision tasks such as object detection and scene recognition, it is very important to develop new techniques for tag cleansing and word sense disambiguation (i.e., removing irrelevant images from the crawled results). Based on this observation, a topic network is first generated to characterize both the semantic similarity contexts and the visual similarity contexts between the image topics more sufficiently. The topic network is used to represent the classes of objects and scenes of interest. Second, both the visual similarity contexts between the images and the semantic similarity contexts between their tags are integrated for tag cleansing and word sense disambiguation. By addressing the issues of polysemes and synonyms more effectively, our word sense disambiguation algorithm can determine the relevance between the images and the associated tags more precisely, and thus it can allow us to crawl large-scale weakly-tagged images for computer vision tasks.

关键词： Weakly-tagged images tag cleansing topic network

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Proceedings of the 1998 Conference on Electronic Imaging and multimedia systems ii

Proceedings of the 1998 Conference on Electronic Imaging and...

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Proceedings of the 1998 Conference on Electronic Imaging and multimedia systems ii

The proceedings contains 61 papers from the SPIE International Society for Optical Engineering Journal on Electronic Imaging and multimedia systems ii. Topics discussed include: image retrievals;gray image recognition;content-based image retrieval;color pattern selections;video segmentations;declarative video data retrieval languages;network databases;fast spatial transformations;moving object segmentation methods;anisotropic segmentations;video segmentation algorithms;wavelet-derived gradient computations;dual-band imaging systems;genetic algorithms;thermal image compression systems;multimedia-on-demand services;personal digital assistant (PDA) systems;and real-time nonlinear video authoring systems.

关键词： Image processing

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Proceedings of the 1998 Conference on Electronic Imaging and multimedia systems ii

Proceedings of the 1998 Conference on Electronic Imaging and...

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Proceedings of the 1998 Conference on Electronic Imaging and multimedia systems ii

关键词： Image processing

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Optimimal resources utilization for indexing within a distributed multimedia retrieval system: An implementation for a video surveillance use case 18

Optimimal resources utilization for indexing within a distri...

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18th International Conference on Distributed multimedia systems, DMS 2012

作者： Codreanu, Dana Manzat, Ana-Maria Sedes, Florence Université de Toulouse IRIT UMR 5505 Toulouse31062 France

ISBN: (纸本)1891706322

Effective and flexible solutions for enabling reduced resource consumption and handling content and associated processing (indexing algorithms) diversity (in terms of location, technical characteristics, execution constraints, requested features) are essential in multimedia management systems. In this paper we present a distributed multimedia retrieval system that enables efficient and effective content processing and access. Though the system’s architecture is a generic one, in order to explain system’s functionalities we will present an instance of the architecture for a video surveillance use case. The proposed system addresses all important topic research concerning this type of systems (architecture, indexing, query) and proposes a novel two steps indexing approach (at acquisition time: implicit indexing and at query time: explicit indexing). We also present in this article how the user access management is done. © 2012 by Knowledge systems Institute Graduate School.

关键词： Indexing (of information)

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Multi-module human motion analysis from a monocular video

Multi-module human motion analysis from a monocular video

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Conference on multimedia content access - algorithms and systems

作者： Lao, Weilun Han, Jungong de With, Peter H. N. Eindhoven Univ Technol POB 513 NL-5600 MB Eindhoven Netherlands LogicaCMG Netherlands NL-5600 JB Eindhoven Netherlands

ISBN: (纸本)9780819466198

In this paper, we propose an effective framework for semantic analysis of human motion from a monocular video. As it is difficult to find a good motion description for humans, we focus on a reliable recognition of the motion type and estimate the body orientation involved in the video sequence. Our framework analyzes the body motion in three modules: a pre-processing module, matching module and semantic module. The proposed framework includes novel object-level processing algorithms, such as a local descriptor and a global descriptor to detect body parts and analyze the shape of the whole body as well. Both descriptors jointly contribute to the matching process by incorporating them into a new weighted linear combination for matching. We also introduce a simple cost function based on time-index differences to distinguish motion types and cycles in human motions. Our system can provide three different types of analysis results: (1) foreground person detection;(2) motion recognition in the sequence;(3) 3-D modeling of human motion based on generic human models. The proposed framework was evaluated and proved its effectiveness as it achieves the motion recognition and body-orientation classification at the accuracy of 95 % and 98 %, respectively.

关键词： human motion content analysis 3-D modeling feature extraction

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Moving away from narrow-scope solutions in multimedia content analysis

Moving away from narrow-scope solutions in multimedia conten...

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2nd European Workshop on the Integration of Knowledge, Semantics and Digital Media Technology, EWIMT 2005

作者： Hanjalic, Alan Nesvadba, Jan Benois-Pineau, Jenny Department of Mediamatics Delft University of Technology Delft Netherlands Storage Systems and Applications Group Philips Research Eindhoven Netherlands LABRI UMR CNRS 5800 University of Bordeaux 1 France

ISBN: (纸本)0863415954

Recent research results in the field of multimedia content Analysis (MCA) have been marked by an abundance of theoretical and algorithmic solutions covering narrow application domains only. In this paper we analyze this tendency and its origin in more detail and explain why, in our view, this should not be considered "the way to go" in providing easy access to content in multimedia systems and applications of the future. In particular, we concentrate on the case study of digital video, which we see as a straightforward example of multimedia. Through this case study we will discuss the needs and challenges of improving the generic potential of MCA algorithms.

关键词： multimedia systems

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Speeding Up Future Video Distribution via Channel-Aware Caching-Aided Coded Multicast

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IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS 2016年第8期34卷 2207-2218页

作者： Cacciapuoti, Angela Sara Caleffi, Marcello Ji, Mingyue Llorca, Jaime Tulino, Antonia Maria Univ Naples Federico II Dept Elect Engn & Informat Technol I-80125 Naples Italy Broadcom Ltd San Jose CA 92127 USA Univ Southern Calif Los Angeles CA 90089 USA Nokia Bell Labs Murray Hill NJ 07974 USA

Future Internet usage will be dominated by the consumption of a rich variety of online multimedia services accessed from an exponentially growing number of multimedia capable mobile devices. As such, future Internet designs will be challenged to provide solutions that can deliver bandwidth-intensive delay-sensitive on-demand video-based services over increasingly crowded and bandwidth-limited wireless access networks. One of the main reasons for the bandwidth stress facing wireless network operators is the difficulty to exploit the multicast nature of the wireless medium when wireless users or access points rarely experience the same channel conditions or access the same content at the same time. In this paper, we present and analyze a novel wireless video delivery paradigm based on the combined use of channel-aware caching and coded multicasting that allows simultaneously serving multiple cache-enabled receivers that may be requesting different content and experiencing different channel conditions. To this end, we reformulate the caching-aided coded multicast problem as a joint source-channel coding problem and design an achievable scheme that preserves the cache-enabled multiplicative throughput gains of the error-free scenario, by guaranteeing per-receiver rates unaffected by the presence of receivers with worse channel conditions.

关键词： Video distribution coded multicast caching wireless channel degraded broadcast channel

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