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检索条件"任意字段=Multimedia Content Access: Algorithms and Systems II"

共 330 条记录，以下是121-130 订阅

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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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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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An efficient method for the unsupervised discovery of signalling motifs in large audio streams

An efficient method for the unsupervised discovery of signal...

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International Workshop on content-Based multimedia Indexing

作者： Muscariello, Armando Gravier, Guillaume Bimbot, Frédéric Rennes France

ISBN: (纸本)9781612844336

Providing effective tools to navigate and access through long audio archives, or monitor and classify broadcast streams, proves to be an extremely challenging task. Main issues originate from the varied nature of patterns of interest in a composite audio environment, the massive size of such databases, and the capability of performing when prior knowledge on audio content is scarce or absent. This paper proposes a computational architecture aimed at discovering occurrences of repeating patterns in audio streams by means of unsupervised learning. The targeted repetitions (or motifs) are called signalling, by analogy with a biological nomenclature, as referring to a broad class of audio patterns (as jingles, songs, advertisements, etc...) frequently occurring in broadcast audio. We adapt a system originally developed for word discovery applications, and demonstrate its effectiveness in a song discovery scenario. The adaption consists in speeding up critical parts of the computations, mostly based on audio feature coarsening, to deal with the large occurrence period of repeating songs in radio streams. © 2011 IEEE.

关键词： Accuracy Computer architecture Heuristic algorithms Libraries Pattern matching Search problems Speech audio archive audio content audio databases audio stream audio streaming biological nomenclature broadcast stream data mining signalling motif unsupervised discovery unsupervised learning unsupervised learning word discovery application

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Load-balanced migration of social media to content clouds

Load-balanced migration of social media to content clouds

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21st International Workshop on Network and Operating systems Support for Digital Audio and Video, NOSSDAV 2011

作者： Cheng, Xu Liu, Jiangchuan School of Computing Science Simon Fraser University Burnaby BC Canada

ISBN: (纸本)9781450307529

Social networked applications have been more and more popular, and have brought great challenges to the network engineering, particularly the huge demands of bandwidth and storage for social media. The recently emerged content clouds shed light on this dilemma. Towards the migration to clouds, partitioning the social contents has drawn significant interests from the literature. Yet the existing works focus on preserving the social relationship only, while an important factor, user access pattern, is largely overlooked. In this paper, by examining a large collection of YouTube video data, we first demonstrate that partitioning the network entirely based on social relationship would lead to unbalanced partitions in terms of access. We further analyze the role of social relationship in the social media applications, and conclude that user access pattern should be taken into account and social relationship should be dynamically preserved. We formulate the problem as a constrained k-medoids clustering problem, and propose a novel Weighted Partitioning Around Medoids (wPAM) solution. We present a dissimilarity/similarity metric to facilitate the preservation of the social relationship. We compare our solution with other state-of-the-art algorithms, and the preliminary results show that it significantly decreases the access deviation in each cloud server, and flexibly preserves the social relationship. © 2011 ACM.

关键词： Digital storage

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A versatile model for web page representation, information extraction and content re-packaging 11

A versatile model for web page representation, information e...

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11th ACM Symposium on Document Engineering, DocEng 2011

作者： Krüpl-Sypien, Bernhard Fayzrakhmanov, Ruslan R. Holzinger, Wolfgang Panzenböck, Mathias Baumgartner, Robert Inst. of Information Systems DBAI Group TU Wien Vienna Austria Lixto Software GmbH Vienna Austria

ISBN: (纸本)9781450308632

On today's Web, designers take huge efforts to create visually rich websites that boast a magnitude of interactive elements. Contrarily, most web information extraction (WIE) algorithms are still based on attributed tree methods which struggle to deal with this complexity. In this paper, we introduce a versatile model to represent web documents. The model is based on gestalt theory principles - trying to capture the most important aspects in a formally exact way. It (i) represents and unifies access to visual layout, content and functional aspects;(ii) is implemented with semantic web techniques that can be leveraged for i.e. automatic reasoning. Considering the visual appearance of a web page, we view it as a collection of gestalt figures -based on gestalt primitives - -each representing a specific design pattern, be it navigation menus or news articles. Based on this model, we introduce our WIE methodology, a re-engineering process involving design patterns, statistical distributions and text content properties. The complete framework consists of the UOM model, which formalizes the mentioned components, and the MANM layer that hints on structure and serialization, providing document re-packaging foundations. Finally, we discuss how we have applied and evaluated our model in the area of web accessibility. © 2011 ACM.

关键词： Websites

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Proceedings of SPIE-IS and T Electronic Imaging - Imaging and Printing in a Web 2.0 World;and multimedia content access: algorithms and systems IV

Proceedings of SPIE-IS and T Electronic Imaging - Imaging an...

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Imaging and Printing in a Web 2.0 World;and multimedia content access: algorithms and systems IV

ISBN: (纸本)9780819479334

The proceedings contain 36 papers. The topics discussed include: contextual advertisement placement in printed media;content-based image retrieval with ontological ranking;a case study on rule-based and CRF-based author extraction methods;new performance evaluation models for character detection in images;navigating web search results;cloud-based printing for mobile devices;using ePub as framework for the automated collection, tagging, and transformation of web content for cross-media publication;a web-based rapid assessment tool for production publishing solutions;an investigation of document aesthetics for web-to-print repurposing of small-medium business marketing collateral;learning from graphic designers: using grids as a scaffolding for automatic print layout;ubiquitous picture-rich content representation;a novel XML-based document format with printing quality for web publishing;and faces from the web: automatic selection and composition of media for casual screen consumption and printed artwork.

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Multi-format Index Data Structure (MIDS) for multimedia container format demultiplexers

Multi-format Index Data Structure (MIDS) for multimedia cont...

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International Conference on Electronic Devices, systems and Applications (ICEDSA)

作者： S.K. Sumanth P. Namratha R. Naveen Kumar N. Ramakrishna Ittiam Systems Pvt. Ltd Bangalore India

multimedia players typically provide a `random-access' feature (also known as seek-to-time) for the user to be able to set the current playing position. While the same is expected of multimedia players on embedded devices, the memory and processing power constraints of the embedded devices pose several challenges in being able to provide an efficient and responsive user experience. This is a particularly significant challenge for large files (especially High-Definition HD video files), and when the multimedia file resides on a slow Input- Output (I/O) device (such as Secure Digital or SD card). In this paper, we propose an indexing mechanism based on a Multi-format Index Data Structure (MIDS). Many previous attempts to create indexing tables have been made but this, we believe, is the first systematic attempt to provide a multi container format and multi-entry format indexing. The proposed index data structure has a time complexity of O (1) for entry retrieval and Ω (1) for entry addition, with a space complexity of O(1). The use of the index data structure in container format demultiplexers results in a dramatic reduction of the seek-to-time operation to about one-tenth (10%) or one-half (50%) of the original time, even with very small index table sizes (1 Kilo Bytes). The result is a more responsive user experience. The proposed index data structure can also be utilized in gaining efficiency through indexing multimedia files in multimedia content Servers (such as YouTube servers) and in indexing Flat File Data Bases.

关键词： Data structures Indexing multimedia communication Containers Heuristic algorithms Complexity theory

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Robust Video and Audio Based Synchronization of multimedia Files

Robust Video and Audio Based Synchronization of Multimedia F...

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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： Raichel, Benjamin A. Bajcsy, Peter Univ Illinois Dept CS 201 N Goodwin Ave Urbana IL 61801 USA Natl Ctr Supercomp Applicat Urbana IL 61801 USA

ISBN: (纸本)9780819479334

This paper addresses the problem of robust and automated synchronization of multiple audio and video signals. The input signals are from a set of independent multimedia recordings coming from several camcorders and microphones. While the camcorders are static, the microphones are mobile as they are attached to people. The motivation for synchronization of all signals is to support studies and understanding of human interaction in a decision support environment that have been limited so far due to the difficulties in automated processing of any observations during the decision making sessions. The application of our work is to environments supporting decisions. The data sets for this work have been acquired during training exercises of response teams, rescue workers, and fire fighters at multiple locations. The developed synchronization methodology for a set of independent multimedia recordings is based on introducing aural and visual landmarks with a bell and room light switches. Our approach to synchronization is based on detecting the landmarks in audio and video signals per camcorder and per microphone, and then fusing the results to increase robustness and accuracy of the synchronization. We report synchronization results that demonstrate accuracy of synchronization based on video and audio.

关键词： Synchronization multimedia content Integration

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WikiPrints - Rendering Enterprise Wiki content for Printing

WikiPrints - Rendering Enterprise Wiki Content for Printing

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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： Berkner, Kathrin Ricoh Innovat Inc Menlo Pk CA 94025 USA

ISBN: (纸本)9780819479334

Wikis have become a tool of choice for collaborative, informative communication. In contrast to the immense Wikipedia, that serves as a reference web site and typically covers only one topic per web page, enterprise wikis are often used as project management tools and contain several closely related pages authored by members of one project. In that scenario it is useful to print closely related content for review or teaching purposes. In this paper we propose a novel technique for rendering enterprise wiki content for printing called WikiPrints, that creates a linearized version of wiki content formatted as a mixture between web layout and conventional document layout suitable for printing. Compared to existing print options for wiki content, Wikiprints automatically selects content from different wiki pages given user preferences and usage scenarios. Meta data such as content authors or time of content editing are considered. A preview of the linearized content is shown to the user and an interface for making manual formatting changes provided.

关键词： Wiki pagination print formatting content linearization graph model arborescence

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Cooperative classification of shared images

Cooperative classification of shared images

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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： Cusano, Claudio Santini, Simone Univ Milano Bicocca Viale Sarca 336 I-20126 Milan Italy Univ Autonoma Madrid E-28049 Madrid Spain

ISBN: (纸本)9780819479334

We propose a method the for semi-automatic organization of photo albums. The method analyzes how different users organize their own pictures. The goal is to help the user in dividing his pictures into groups characterized by a similar semantic content. The method is semi-automatic: the user starts to assign labels to the pictures and unlabeled pictures are tagged with proposed labels. The user can accept the recommendation or made a correction. We use a suitable feature representation of the images to model the different classes that the users have collected. Then, we look for correspondences between the criteria used by the different users which are integrated using boosting. A quantitative evaluation of the proposed approach is obtained by simulating the amount of user interaction needed to annotate the albums of a set of members of the flickr (R) photo-sharing community.

关键词： Personal photography automatic image annotation content-based image analysis social image retrieval

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