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A weight-aware recommendation algorithm for mobile multimedia systems

mobile INFORMATION systems 2013年第2期9卷 139-155页

作者： Rosa, Pedro M. P. Rodrigues, Joel J. P. C. Basso, Filippo Univ Beira Interior Inst Telecomunicacoes P-6201001 Covilha Portugal

In the last years, information flood is becoming a common reality, and the general user, hit by thousands of possible interesting information, has great difficulties identifying the best ones, that can guide him in his/her daily choices, like concerts, restaurants, sport gatherings, or culture events. The current growth of mobile smartphones and tablets with embedded GPS receiver, Internet access, camera, and accelerometer offer new opportunities to mobile ubiquitous multimedia applications that helps gathering the best information out of an always growing list of possibly good ones. This paper presents a mobile recommendation system for events, based on few weighted context-awareness data-fusion algorithms to combine several multimedia sources. A demonstrative deployment were utilized relevance like location data, user habits and user sharing statistics, and data-fusion algorithms like the classical CombSUM and CombMNZ, simple, and weighted. Still, the developed methodology is generic, and can be extended to other relevance, both direct (background noise volume) and indirect (local temperature extrapolated by GPS coordinates in a Web service) and other data-fusion techniques. To experiment, demonstrate, and evaluate the performance of different algorithms, the proposed system was created and deployed into a working mobile application providing real time awareness-based information of local events and news.

关键词： mobile computing ubiquitous computing location-aware content-aware iphone applications multimedia applications mobility

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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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Subjective evaluation of mobile 3D video content: depth range versus compression artifacts

Subjective evaluation of mobile 3D video content: depth rang...

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

作者： Jumisko-Pyykko, Satu Haustola, Tomi Boev, Atanas Gotchev, Atanas Tampere Univ Technol Unit Human Centered Technol POB 589 FI-33101 Tampere Finland Tampere Univ Technol Dept Signal Proc FI-33101 Tampere Finland

ISBN: (纸本)9780819484185

mobile 3D television is a new form of media experience, which combines the freedom of mobility with the greater realism of presenting visual scenes in 3D. Achieving this combination is a challenging task as greater viewing experience has to be achieved with the limited resources of the mobile delivery channel such as limited bandwidth and power constrained handheld player. This challenge sets need for tight optimization of the overall mobile 3DTv system. Presence of depth and compression artifacts in the played 3D video are two major factors that influence viewer's subjective quality of experience and satisfaction. The primary goal of this study has been to examine the influence of varying depth and compression artifacts on the subjective quality of experience for mobile 3D video content. In addition, the influence of the studied variables on simulator sickness symptoms has been studied and vocabulary-based descriptive quality of experience has been conducted for a sub-set of variables in order to understand the perceptual characteristics in detail. In the experiment, 30 participants have evaluated the overall quality of different 3D video contents with varying depth ranges and compressed with varying quantization parameters. The test video content has been presented on a portable autostereoscopic LCD display with horizontal double density pixel arrangement. The results of the psychometric study indicate that compression artifacts are a dominant factor determining the quality of experience compared to varying depth range. More specifically, contents with strong compression has been rejected by the viewers and deemed unacceptable. The results of descriptive study confirm the dominance of visible spatial artifacts along the added value of depth for artifact-free content. The level of visual discomfort has been determined as not offending.

关键词： mobile 3D television subjective evaluation quality of experience quality perception

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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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MobiUP: An Upsampling-Based System Architecture for High-Quality video Streaming on mobile devices

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IEEE TRANSACTIONS ON multimedia 2011年第5期13卷 1077-1091页

作者： Shuai, Hong-Han Yang, De-Nian Cheng, Wen-Huang Chen, Ming-Syan Acad Sinica Res Ctr Informat Technol Innovat CITI Taipei 11529 Taiwan Natl Taiwan Univ Grad Inst Commun Engn Taipei 10617 Taiwan

Nowadays, mobile video streaming enables people to access digital content, such as online Tv shows, music videos, sports reports, and news programs, anytime, anywhere. However, current streaming services in mobile networks are subject to the available wireless bandwidth shared among many users and can only provide videos with limited resolutions. Moreover, on recently developed high-resolution mobile devices, such as iPhone, Google Nexus One, Nokia N97, and SonyEricsson X10, the resolution of video streaming is much lower than the devices can actually support. As a result, existing video upsampling schemes usually introduce visual artifacts. In response to the above problem, we bridge the resolution gap between streaming videos and client screens, and propose a novel upsampling-based system architecture, called MobiUP, to enable high-quality video streaming onto mobile devices. To avoid modifying existing codecs for video streaming, MobiUP upsamples videos with decoded frames and appends a limited amount of metadata to the streaming videos for facilitating high-quality and real-time conversion from low resolution to high fullscreen resolution on the client side. In other words, the proposed upsampling architecture complements current systems. Therefore, MobiUP is generic and flexible, and it can be implemented easily on mobile devices for practical use. The implementation results demonstrate that, although the appended metadata is less than 8% of the total transmitted data, it improves the quality of the upsampled video significantly. Meanwhile, the computation time of MobiUP Client is close to that of bilinear upsampling algorithms implemented on mobile devices.

关键词： mobile video video upsampling

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Revised Benchmarking of Contact-less Fingerprint Scanners for Forensic Fingerprint Detection: Challenges and Results for Chromatic White Light Scanners (CWL)

Revised Benchmarking of Contact-less Fingerprint Scanners fo...

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

作者： Kiltz, Stefan Leich, Marcus Dittmann, Jana vielhauer, Claus Ulrich, Michael Otto Von Guericke Univ Res Grp Multimedia & Secur POB 4120 Magdeburg Germany Brandenburg Univ Appl Sci Dept Informat & Media Brandenburg Germany State Police Headquarters Saxony Anhalt D-39124 Magdeburg Germany

ISBN: (纸本)9780819484185

mobile contact-less fingerprint scanners can be very important tools for the forensic investigation of crime scenes. To be admissible in court, data and the collection process must adhere to rules w.r.t. technology and procedures of acquisition, processing and the conclusions drawn from that evidence. Currently, no overall accepted benchmarking methodology is used to support some of the rules regarding the localisation, acquisition and pre-processing using contact-less fingerprint scanners. Benchmarking is seen essential to rate those devices according to their usefulness for investigating crime scenes. Our main contribution is a revised version of our extensible framework for methodological benchmarking of contact-less fingerprint scanners using a collection of extensible categories and items. The suggested main categories describing a contact-less fingerprint scanner are properties of forensic country-specific legal requirements, technical properties, application-related aspects, input sensory technology, pre-processing algorithm, tested object and materials. Using those it is possible to benchmark fingerprint scanners and describe the setup and the resulting data. Additionally, benchmarking profiles for different usage scenarios are defined. First results for all suggested benchmarking properties, which will be presented in detail in the final paper, were gained using an industrial device (FRT MicroProf200) and conducting 18 tests on 10 different materials.

关键词： Benchmarking contact-less optical sensors latent fingerprints

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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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Adaptive IPTv services based on a novel IP multimedia Subsystem

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multimedia TOOLS AND APPLICATIONS 2011年第2期55卷 333-352页

作者： Arnaud, Julien Negru, Daniel Sidibe, Mamadou Pauty, Julien Koumaras, Harilaos Univ Bordeaux CNRS LaBRI Lab Talence France Viotech Commun Res & Dev Versailles France NCSR Demokritos Inst Informat & Telecommun Athens Greece Univ Bordeaux ENSEIRB Sch Engineers Talence France NCSR Demokritos Digital Commun Lab Athens Greece

Heterogeneous communication devices are emerging and changing the way of communication. Innovative multimedia applications are now accessible through these embedded systems. The 3GPP IP multimedia Subsystem (IMS) provides a basic architecture framework for the Next Generation Network (NGN) supporting the convergence platform for service provisioning in heterogeneous networks. ETSI TISPAN standardization effort focuses on delivering IPTv services on such platform. Nevertheless, IPTv on IMS standardization suffers from a lack of efficient user-centric network management mechanisms as the end-user may consume IPTv service from different access networks, on different mobile devices, at anytime. User's Perceived Quality of Service (PQoS) or Quality of Experience (QoE) of IPTv service may also suffer from wireless access network impairments. This paper introduces new functionalities in IPTv over IMS architecture which optimize satisfaction of the end-user and resource utilization of the operator's networks. A context-sensitive User Profile (UP) model is used to deliver IPTv streams adapted to the user's environment. In order to optimize the operator network usage, the impact of spatiotemporal dynamics of the video content on the deduced perceptual quality is considered. A multimedia content Management System (MCMS) is proposed to perform dynamic cross-layer adaptation of the IPTv stream based on PQoS measurements at the end-user side.

关键词： IMS IPTv User-profile Adaptation PQoS

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Community-Based Applications

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BELL LABS TECHNICAL JOURNAL 2011年第4期15卷 93-109页

作者： Marilly, Emmanuel Senot, Christophe Andrieu, Xavier Boidart, Bertrand Aghasaryan, Armen Germaneau, Alexis Alcatel Lucent Bell Labs Serv Infrastruct Res Domain Villarceaux France France Telecom Res Dept Lannion France

The WellCom platform enables the creation, delivery, and management of advanced personalized and interactive multimedia applications and services in a distributed home environment. End users obtain easy and seamless access to interactive and personalized television (Tv) services as well as Tv-related applications through their mobile terminals. The supporting devices and technologies include Tv sets, mobile terminals for interaction with Tv content and to deliver personalized services directly to the user;and near field communication (NFC)/Bluetooth technologies which combine with an "easy-pairing" mechanism for access to interactive programs and social applications. Individual interactivity opens up new possibilities for group experience of Tv content. For example, users can themselves take part in a broadcast Tv quiz or compete with friends. Personalization allows service providers to tap into new revenue streams such as targeted advertisements on mobile phones. (C) 2011 Alcatel-Lucent.

关键词： Interactive computer systems

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IEEE 802.21 Information Services deployment for heterogeneous mobile environments

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IET COMMUNICATIONS 2011年第18期5卷 2721-2729页

作者： Buiati, F. villalba, L. J. G. Corujo, D. Sargento, S. Aguiar, R. L. Univ Complutense Madrid GASS DISIA Fac Informat E-28040 Madrid Spain Univ Aveiro Inst Telecomunicacoes P-3810193 Aveiro Portugal

In the future mobile Internet, a key challenge is how the content is delivered to the mobile user, especially when there are multiple networks belonging to distinct operators. Knowing the network services and conditions available at each one becomes crucial. In order to store information from several networks and operators, the new IEEE 802.21 standard specifies a Media Independent Information Service (MIIS) supporting various information elements (IEs) that provide network information within a geographical area, with the aim of optimising the handover process. Since next-generation wireless devices are expected to support multiple radio access networks, users will be able to maintain connections when switching from one network to another. This article addresses a general approach towards the deployment of a Hierarchical 802.21 Information Service management infrastructure in a heterogeneous mobile environment. Through an NS-2-based simulation, it is shown that the proposed scheme improves the user experience in terms of MIIS server access time and number of optimal handovers in a random mobility scenario.

关键词： IEEE 802.21 standard information services IEEE 802.21 information services deployment hierarchical 802.21 information service management infrastructure NS-2-based simulation radio access networks information elements mobile radio systems network conditions mobility management (mobile radio) handover process optimal handovers mobile user multiple radio access networks MIIS server access time next-generation wireless devices multimedia communication media independent information service Network management geographical area mobile Internet Internet random mobility scenario IEEE standards Radio access systems network information network services distinct operators next generation networks heterogeneous mobile environments multimedia communications

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