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检索条件"任意字段=Conference on Multimedia Content Access - Algorithms and Systems"

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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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Performance Modelling of Video-on-Demand systems

Performance Modelling of Video-on-Demand Systems

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17th Asia-Pacific conference on Communications (APCC)

作者： Hanczewski, Slawomir Stasiak, Maciej Poznan Univ Tech Chair Commun & Comp Networks PL-60954 Poznan Poland

ISBN: (纸本)9781457703881;9781457703898

Video-on-Demand (VoD) system have become increasingly popular over time. Currently constructed systems offer to their users a vast array of multimedia content spanning movies, video clips, TV programs, etc. that is made available through many video servers. One of the very important parameters at the initial stage of the system design is the blocking probability that follow the instances of unavailability of service resulting from the lack of provision of access to a given content. This parameter can be defined by means of appropriate tools, i.e. analytical models of systems, that enable to determine the level of losses in a system under design in relation to offered access demand and usage. The paper presents a new method for modelling of distributed Video-on-Demand systems. The proposed method is based on Erlang's Ideal Grading (EIG) with differentiated availability. Until now, Erlang's ideal gradings have not been used in modelling systems such as VoD.

关键词： Analytical models Availability Erlang ideal grading multimedia communication Probability Servers Streaming media TV programs access demand access usage blocking probability multimedia communication multimedia content spanning movies video clips video on demand video servers video servers video-on-demand systems

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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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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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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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AN EVALUATION OF PIECE-PICKING algorithms FOR LAYERED content IN BITTORRENT-BASED PEER-TO-PEER systems

AN EVALUATION OF PIECE-PICKING ALGORITHMS FOR LAYERED CONTEN...

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IEEE International conference on multimedia and Expo (ICME)

作者： Eberhard, Michael Hellwagner, Hermann Timmerer, Christian Szkaliczki, Tibor Szobonya, Laszlo Alpen Adria Univ Klagenfurt ITEC MMC Klagenfurt Austria MTA SZTAKI eLearning Dept Klagenfurt Austria

ISBN: (纸本)9781612843490

In this paper the performance of layered piece-picking algorithms for Bittorrent-based peer-to-peer systems is evaluated and compared to traditional single layer solutions. In a Bittorrent-based peer-to-peer system, the piece-picking algorithm needs to ensure that the pieces of an audiovisual content are received in time to ensure smooth playback of the content. For layered content provided in multiple qualities, the task of the algorithm becomes more complex, as it has to consider the layer of the pieces to be fetched in addition to the deadline. Thus, the goal of the layered piece-picking algorithm is to ensure that the best possible quality under the given network conditions is received while the playback is not disturbed. To illustrate the advantages of such a layered piece-picking algorithm, its performance is evaluated and compared to a single layer piece-picking algorithm. The results show that layered piece-picking algorithms can significantly improve the quality in terms of peak signal-to-noise ratio.

关键词： Peer-to-Peer Layered content Piece-Picking Evaluation

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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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Adapting indexation to the content, context and queries characteristics in distributed multimedia systems

Adapting indexation to the content, context and queries char...

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7th International conference on Signal Image Technology and Internet-Based systems, SITIS 2011

作者： Brut, Mihaela Codreanu, Dana Manzat, Ana-Maria Sedes, Florence Institut de Recherche en Informatique de Toulouse Université Paul Sabatier 118 Route de Narbonne 31062 Toulouse Cedex 9 France

ISBN: (纸本)9780769546353

Due to the dramatically increasing amount of multimedia contents in several application domains, effective and flexible solutions for distributed data indexation are essential. In the management of these multimedia contents, the indexing process is the most important resource consumer, in terms of data transfer over the network and CPU consumption. As result of our research, we located two points for reducing resource consumption: the limitation of multimedia content transfer over the network for indexing, as well as the reduction of multimedia indexing amount by employing only the most appropriate algorithms for performing indexation, only over the relevant contents. We present in this paper the solution developed in the context of the LINDO project for indexing multimedia content into a distributed system that originally address these two points by reducing as much as possible the resource consumption through (1) a distributed indexing technique that avoids multimedia transfer, (2) a flexible mechanism for selecting the indexing algorithms to be employed on each remote server, according to the multimedia content characteristics, its acquisition context and user queries history. © 2011 IEEE.

关键词： Data transfer

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A distributed architecture for flexible multimedia management and retrieval

A distributed architecture for flexible multimedia managemen...

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22nd International conference on Database and Expert systems Applications, DEXA 2011

作者： Brut, Mihaela Codreanu, Dana Dumitrescu, Stefan Manzat, Ana-Maria Sedes, Florence Universite de Toulouse IRIT UMR 5505 Toulouse 31062 France

ISBN: (纸本)9783642230905

Developing an efficient system that manages distributed multimedia content supposes to minimize resource consumption while providing the most relevant results for a user's query in the shortest time. This paper presents LINDO, a generic architecture framework for distributed systems that acquires efficiency in multimedia indexing and retrieval. Three characteristics particularize it: (1) it differentiates between implicit algorithms executed over all the multimedia content at the acquisition time, and explicit algorithms, executed on demand for answering a specific need;(2) it stores and processes multimedia content and metadata locally, instead of transferring and indexing it on a central server;(3) it selects a set of relevant servers for query execution based on the user query semantic processing and on the system knowledge, including descriptions of distributed servers, multimedia content and indexing algorithms. The paper relies on a concrete implementation of the LINDO framework in order to validate this contribution. © 2011 Springer-Verlag Berlin Heidelberg.

关键词： Indexing (of information)

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APRICOD: A distributed caching middleware for fast content discovery of non-continuous media access 11

APRICOD: A distributed caching middleware for fast content d...

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19th ACM International conference on multimedia ACM multimedia 2011, MM'11

作者： Zhao, Zhen Wei Ooi, Wei Tsang NUS Graduate School for Integrative Sciences and Engineering National University of Singapore Singapore Singapore School of Computing National University of Singapore Singapore Singapore

ISBN: (纸本)9781450306164

We propose an access pattern-driven distributed caching middleware named APRICOD, which can be built on top of any existing content discovery system. APRICOD caters for fast and scalable content discovery in peer-to-peer media streaming systems, especially when user interactions that leads to non-continuous media access (such as random seek in video and teleportation in virtual environment) are present. APRICOD caches query results based correlations among media objects accessed by users, reducing the content discovery time. Our evaluation using a VoD access trace shows that close to 70% of non-continuous access queries can be resolved with a single hop using APRICOD. Copyright 2011 ACM.

关键词： Virtual reality

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