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International Conference on Distributed Computing in Sensor systems (DCOSS)

作者： Guotao Zhao Huadong Ma Yan Sun Hong Luo Liang Liu Beijing Key Laboratory of Intelligent Telecommunication Software and Multimedia Beijing University of Posts and Telecommunications Beijing China

In Wireless multimedia Sensor Networks (WMSNs), data fusion and collaborative in-network processing operations often require effective multimedia synchronization control. Extensive researches have been done in the traditional networks. Most of these works assume that there exists a powerful synchronization controller in the network. However, for WMSNs, the in-network processing of the multimedia content is usually performed based on the resource-constrained sensors. Traditional synchronization control algorithms fail to run on the low-end hardware platform. In this paper, we propose an adaptive synchronization control scheme with multi-level buffer to address this problem. Main contributions of this paper are as follows. (i) To overcome the resource constraint of WMSNs, we perform the synchronization control in a distributed way by combining the sensors in the stream transmission path. (ii) By evaluating the current network state, we adjust the level number of the buffer adaptively to balance the delay and delay jitter. (iii) Through analyzing the buffer state of each level, we propose an efficient packet scheduling scheme to reduce the delay jitter actively. (iv) We implement the proposed scheme and verify its effectiveness in our practical WMSNs platform. The experiment results show that the proposed scheme can maintain the streams synchronization effectively with the low-end sensors.

关键词： Synchronization Jitter Delay multimedia communication Process control Streaming media Media

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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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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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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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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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Recent advances in multimedia networking

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multimedia TOOLS AND APPLICATIONS 2011年第3期54卷 635-647页

作者： Cerqueira, Eduardo Zeadally, Sherali Leszczuk, Mikolaj Curado, Marilia Mauthe, Andreas Fed Univ Para BR-66075110 Belem Para Brazil Univ Dist Columbia Washington DC 20008 USA AGH Univ Sci & Technol PL-30059 Krakow Poland Univ Coimbra P-3030290 Coimbra Portugal Univ Lancaster Lancaster LA1 4WA England

In recent years, the ubiquity of multimedia services along with the proliferation of mobile devices and the demand for new audio and video applications are changing the life style of users. User demands for multimedia access anywhere, anytime from any device are creating new challenges for research communities from both academia and industry. It is expected that video-based services alone will account for 50 percent of all consumer network traffic in 2012 and we will continue to witness the explosive growth in users sharing multimedia content over the Internet. In this context, new network, application, and user-based approaches must be created to deal with such complex multimedia systems. This paper presents some of the recent advances in multimedia networking focusing primarily on areas that have been receiving attention recently and are expected to continue to generate further interests in coming years. These areas include Quality of Experience (QoE) and various related standardization issues, content Distribution Networks (CDNs), multimedia communications, mobile multimedia. This paper also briefly highlights some of the major challenges that still need to be addressed to enable the support and delivery of multimedia services anywhere, anytime over highly heterogeneous infrastructures and user terminal devices.

关键词： multimedia Quality of service Quality of experience content distribution Networking Mobile multimedia

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Know Your Data: Understanding Implicit Usage versus Explicit Action in Video content Classification

Know Your Data: Understanding Implicit Usage versus Explicit...

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

作者： Yew, Jude Shamma, David A. Yahoo Res Santa Clara CA 95054 USA

ISBN: (纸本)9780819484185

In this paper, we present a method for video category classification using only social metadata from websites like YouTube. In place of content analysis, we utilize communicative and social contexts surrounding videos as a means to determine a categorical genre, e. g. Comedy, Music. We hypothesize that video clips belonging to different genre categories would have distinct signatures and patterns that are reflected in their collected metadata. In particular, we define and describe social metadata as usage or action to aid in classification. We trained a Naive Bayes classifier to predict categories from a sample of 1,740 YouTube videos representing the top five genre categories. Using just a small number of the available metadata features, we compare the classifications produced by our Naive Bayes classifier with those provided by the uploader of that particular video. Compared to random predictions with the YouTube data (21% accurate), our classifier attained a mediocre 33% accuracy in predicting video genres. However, we found that the accuracy of our classifier significantly improves by nominal factoring of the explicit data features. By factoring the ratings of the videos in the dataset, the classifier was able to accurately predict the genres of 75% of the videos. We argue that the patterns of social activity found in the metadata are not just meaningful in their own right, but are indicative of the meaning of the shared video content. The results presented by this project represents a first step in investigating the potential meaning and significance of social metadata and its relation to the media experience.

关键词： Video Social Categorization YouTube Naive Bayes Classification

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content routing algorithms to support Publish/Subscribe in Mobile Ad Hoc Networks

Content routing algorithms to support Publish/Subscribe in M...

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IEEE Conference on ALocal Computer Networks Workshops (LCN Workshops)

作者： Stephan Schnitzer Hugo Miranda Boris Koldehofe Institute of Parallel and Distributed Systems University of Stuttgart Germany Departamento de Informática University of Lisbon Portugal

Mobile Ad Hoc Networks (MANETs) allow communication between moving nodes without using infrastructure like access points, stationary routers or GPS. This offers new communication opportunities, especially in challenging environments. To communicate in MANETs we often need routing functionality, which usually provides unicast-based best effort packet delivery. Publish/Subscribe (Pub/Sub) is a well known and powerful paradigm that provides higher expressiveness than unicast routing. It decouples senders from receivers and allows information exchange between network nodes that offer certain data (called publishers) and nodes that declare their interest in data of some pattern (called subscribers). Especially in MANET applications, Pub/Sub provides useful functionality to support realistic scenarios and novel applications. This paper proposes a new algorithm called TPSR, tailored to efficiently support Pub/Sub in MANETs. It is based mainly on two principles: i) it uses the dissemination of subscriptions to create source routes; and ii) it uses the signal strength messages are received with, to optimize routes in terms of striking a good balance between long routes and fragile routes. Simulations based on ns-2 demonstrate its performance, in comparison with flooding and unicast-based solutions.

关键词： Subscriptions Ad hoc networks Mobile computing Routing Routing protocols Delay Mobile communication

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Material Classification and Automatic content Enrichment of Images Using Supervised Learning and Knowledge Bases

Material Classification and Automatic Content Enrichment of ...

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

作者： Mallepudi, Sri Abhishikth Calix, Ricardo A. Knapp, Gerald M. Louisiana State Univ Baton Rouge LA 70803 USA

ISBN: (纸本)9780819484185

In recent years there has been a rapid increase in the size of video and image databases. Effective searching and retrieving of images from these databases is a significant current research area. In particular, there is a growing interest in query capabilities based on semantic image features such as objects, locations, and materials, known as content-based image retrieval. This study investigated mechanisms for identifying materials present in an image. These capabilities provide additional information impacting conditional probabilities about images (e. g. objects made of steel are more likely to be buildings). These capabilities are useful in Building Information Modeling (BIM) and in automatic enrichment of images. I2T methodologies are a way to enrich an image by generating text descriptions based on image analysis. In this work, a learning model is trained to detect certain materials in images. To train the model, an image dataset was constructed containing single material images of bricks, cloth, grass, sand, stones, and wood. For generalization purposes, an additional set of 50 images containing multiple materials (some not used in training) was constructed. Two different supervised learning classification models were investigated: a single multi-class SVM classifier, and multiple binary SVM classifiers (one per material). Image features included Gabor filter parameters for texture, and color histogram data for RGB components. All classification accuracy scores using the SVM-based method were above 85%. The second model helped in gathering more information from the images since it assigned multiple classes to the images. A framework for the I2T methodology is presented.

关键词： Image classification Binary data RGB color model Machine learning Image filtering Data modeling Feature extraction Databases Buildings content based image retrieval

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