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Media and metadata management for capture and access systems in electronic lecturing environments

Media and metadata management for capture and access systems...

引用

4th International Conference on multimedia and Expo (ICME 2003)

作者： Stewart, A Wolf, P Hemmje, M Fraunhofer IPSI Darmstadt Germany

ISBN: (纸本)0780379659

One of the main challenges facing web-based multimedia content creators today is the development of cost-effective digital media content for courseware that is reusable and interoperable. Given this, we propose the design and implementation of a model to manage the multimedia and meta-data within a system of related topics in a course that is delivered via electronic lectures. This model not only supports the re-purposing and interchange of a course's digital media content, but also preserves the semantic dependencies and associated media-mapping, of pre-requisite and co-requisite knowledge within a course. Coarse grain or topic-based segmentations of an electronic lecture are used as building blocks to automatically create new, media-rich, electronic lecture experiences of interest to a user and subject to the constraints imposed by the model.

关键词： Digital storage

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Design and Evaluation of Security Multi-Media Warnings for Children's Smartphones

Design and Evaluation of Security Multi-Media Warnings for C...

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

作者： Menzel, Wiebke Tuchscheerer, Sven Fruth, Jana Kraetzer, Christian Dittmann, Jana Otto von Guericke Univ D-39016 Magdeburg Germany

ISBN: (纸本)9780819489517

This article describes primarily the development and empiric validation of a design for security warning messages on smartphones for primary school children (7-10 years old). Our design approach for security warnings for children uses a specific character and is based on recommendations of a paediatrician expert. The design criteria are adapted to children's skills, e. g. their visual, acoustic, and haptic perception and their literacy. The developed security warnings are prototypically implemented in an iOS application (on the iPhone 3G/4G) where children are warned by a simulated anti-malware background service, while they are busy with another task. For the evaluation we select methods for empiric validation of the design approach from the field of usability testing ("think aloud" test, questionnaires, log-files, etc.). Our security warnings prototype is evaluated in an empiric user study with 13 primary school children, aged between 8 and 9 years and of different gender (5 girls, 8 boys). The evaluation analysis shows, that nearly all children liked the design of our security warnings. Surprisingly, on several security warning messages most of the children react in the right way after reading the warning, although the meaning couldn't be interpreted in the right way. Another interesting result is, that several children relate specific information, e. g. update, to a specific character. Furthermore, it could be seen that most of the primary school test candidates have little awareness of security threats on smartphones. It is a very strong argument to develop e. g. tutorials or websites in order to raise awareness and teach children how to recognize security threats and how to react to them. Our design approach of security warnings for children's smartphones can be a basis for warning on other systems or applications like tutorials, which are used by children. In a second investigation, we focus on webpages, designed for children since smartphones and webpages (t

关键词： security warnings webpages children user-centered studies smartphones

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System support for pervasive multimedia systems

System support for pervasive multimedia systems

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作者： Liu, Xiaotao University of Massachusetts Amherst

学位级别：Ph.D.

The proliferation of multimedia-capable mobile devices, such as laptops, personal digital assistants (PDA), and cellular telephones, has lend to an explosive increase of multimedia contents. With the increasing capacities of disk storage, this trend has encouraged users to create ever-larger personal digital libraries of audios, pictures, and videos. The prevalence of small and mobile devices such as sensors and RFID tags is expected to create an ubiquitous computing environment. This ubiquitous environment can provide us pervasive locationing and identification services, and further can create sensor data streams encoding object’s location and identity which are the context of media capture. The concurrence of these two trends enable a new set of multimedia systems that we refer to as Pervasive multimedia systems. Pervasive multimedia systems enable users to create, access and navigate large volumes of multimedia content on a variety of personal mobile devices. Designing these pervasive multimedia systems face three major challenges: (i) achieving energy efficiency for the battery-powered mobile devices; (ii) searching and retrieving media content in a fast and human-friendly manner; and (iii) identifying and locating in scalable and maintainable fashions. In this thesis, We propose techniques that provide system support for pervasive multimedia systems to address these challenges. Due to the power constraints, battery-powered mobile devices impose requirements of energy efficiency. On the other hand, the real-time nature of multimedia applications makes it challenging to trade off application's performance with energy savings. To achieve energy efficiency without sacrificing application's quality-of-service (QoS), We have developed power management techniques using application domain-specific knowledge and time-series-based models. Our approaches can reduce the power consumption of mobile devices significantly, while at the same time still meet the QoS requirement

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content-Based Image Retrieval With Ontological Ranking

Content-Based Image Retrieval With Ontological Ranking

引用

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

作者： Tsai, Shen-Fu Tsai, Min-Hsuan Huang, Thomas S. Univ Illinois Coordinated Sci Lab Urbana IL 61801 USA

ISBN: (纸本)9780819479334

Images are a much more powerful medium of expression than text, as the adage says: "One picture is worth a thousand words." It is because compared with text consisting of an array of words, an image has more degrees of freedom and therefore a more complicated structure. However, the less limited structure of images presents researchers in the computer vision community a tough task of teaching machines to understand and organize images, especially when a limit number of learning examples and background knowledge are given. The advance of internet and web technology in the past decade has changed the way human gain knowledge. People, hence, can exchange knowledge with others by discussing and contributing information on the web. As a result, the web pages in the internet have become a living and growing source of information. One is therefore tempted to wonder whether machines can learn from the web knowledge base as well. Indeed, it is possible to make computer learn from the internet and provide human with more meaningful knowledge. In this work, we explore this novel possibility on image understanding applied to semantic image search. We exploit web resources to obtain links from images to keywords and a semantic ontology constituting human's general knowledge. The former maps visual content to related text in contrast to the traditional way of associating images with surrounding text;the latter provides relations between concepts for machines to understand to what extent and in what sense an image is close to the image search query. With the aid of these two tools, the resulting image search system is thus content-based and moreover, organized. The returned images are ranked and organized such that semantically similar images are grouped together and given a rank based on the semantic closeness to the input query. The novelty of the system is twofold: first, images are retrieved not only based on text cues but their actual contents as well;second, the grouping is

关键词： Image retrieval ontology multimedia

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Ubiquitous picture rich content representation

Ubiquitous picture rich content representation

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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： Wang, Wiley Dean, Jennifer Muzzolini, Russ Shutterfly Inc. (United States)

ISBN: (纸本)9780819479334

The amount of digital images taken by the average consumer is consistently increasing. People enjoy the convenience of storing and sharing their pictures through online (digital) and offline (traditional) media. A set of pictures can be uploaded to: online photo services, web blogs and social network websites. Alternatively, these images can be used to generate: prints, cards, photo books or other photo products. Through uploading and sharing, images are easily transferred from one format to another. And often, a different set of associated content (text, tags) is created across formats. For example, on his web blog, a user may journal his experiences of his recent travel;on his social network website, his friends tag and comment on the pictures;in his online photo album, some pictures are titled and keyword-tagged. When the user wants to tell a complete story, perhaps in a photo book, he must collect, across all formats: the pictures, writings and comments, etc. and organize them in a book format. The user has to arrange the content of his trip in each format. The arrangement, the associations between the images, tags, keywords and text, cannot be shared with other formats. In this paper, we propose a system that allows the content to be easily created and shared across various digital media formats. We define a uniformed data association structure to connect: images, documents, comments, tags, keywords and other data. This content structure allows the user to switch representation formats without reediting. The framework under each format can emphasize (display or hide) content elements based on preference. For example, a slide show view will emphasize the display of pictures with limited text;a blog view will display highlighted images and journal text;and the photo book will try to fit in all images and text content. In this paper, we will discuss the strategy to associate pictures with text content, so that it can naturally tell a story. We will also list sampl

关键词： photo book photo sharing website content association content representation

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Automated document content characterization for a multimedia document retrieval system

Automated document content characterization for a multimedia...

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Conference on multimedia Storage and Archiving systems ii

作者： Koivusaari, M Sauvola, J Pietikainen, M Univ. of Oulu (Finland)

ISBN: (纸本)0819426628

We propose a new approach to automate document image layout extraction for an object-oriented database feature population using rapid low level feature analysis, preclassification and predictive coding. The layout information comprised of region location and classification data is transformed into 'feature object(s)'. The information is then fed into an intelligent document image retrieval system (IDIR) to be utilized in document retrieval schemes. The IDIR system consists of user interface, object-oriented database and a variety of document image analysis algorithms. In this paper the object-oriented storage model and the database system are presented in formal and functional domains. Moreover, the graphical user interface and a visual document image browser are described. The document analysis techniques used at document characterization are also presented. In this context the documents consist of text, picture and other media (possibly embedded) data. Documents are stored in the database as document, page and region objects. Our test system has been implemented and tested using a document database of 10 000 documents.

关键词： document layout analysis predictive coding document database retrieval document content characterization object-oriented database

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Toward flexible user interaction in content-based multimedia data retrieval

Toward flexible user interaction in content-based multimedia...

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作者： Nakazato, Munehiro University of Illinois at Urbana-Champaign

学位级别：Ph.D.

This thesis discusses various aspects of digital image retrieval and management. First, we discuss user interface and visualization for digital image management. Two innovative systems are proposed. 3D MARS is immersive 3D display for image visualization and search systems. The user browses and searches images in 3D virtual reality environment. ImageGrouper is another graphical user interface for digital image search and organization. New concept, Object-Oriented User Interaction is introduced. The system improves image retrieval and eases text annotation and organization of digital images. Unlike the traditional user interfaces for image retrieval, ImageGrouper allows the user to group query example images. To take advantage of this feature, a new algorithm for relevance feedback is proposed. Next, this thesis discusses data structures and algorithms for high-dimensional data access. This is an essential component of multimedia data retrieval. The results of preliminary experiments are presented.

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MPEG-4 - The emerging multimedia standard (invited)

MPEG-4 - The emerging multimedia standard (invited)

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2nd IEEE International Caracas Conference on Devices, Circuits and systems (ICCDCS 98)

作者： Rao, KR Univ Texas Dept Elect Engn Arlington TX 76019 USA

ISBN: (纸本)0780344340

This paper presents an overview of the aims and objectives of MPEG-4. This standard scheduled for November 1998 addresses content-based interactivity, universal access, robustness in error-prone environments, manipulation of objects, both synthetic and natural, etc., at various bit rates, quality levels and spatial/temporal resolutions. The standard is designed to accommodate different communication networks, processors and platforms through tools, algorithms and profiles.

关键词： Image coding

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Strategies for video file replication based on multiple video popularity models

Strategies for video file replication based on multiple vide...

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Proceedings of the Seventh IASTED International Conference on Internet and multimedia systems and Applications

作者： Chan, Cheok-Kuan To, Tsun-Ping J. Li, Chi-Kwong Department of Electronic Engineering Hong Kong Polytechnic University Hung Hom SAR Hong Kong

ISBN: (纸本)0889863806

Fast Internet access technology (ADSL and VDSL) and the coming 3G mobile communication system of high data bandwidth capacity highly facilitate multimedia traffic demands by people. However, there are comparatively little technological advancements in the storage system, the essential part of VoD system. Disk array seems to be the most cost effective choice when I/O Bandwidths, disk space cost and scalability are all considered. The central question is how to offer more concurrent accesses to the videos(especially the popular ones) with the QoS requirements satisfied. In this paper, two replication algorithms are developed and evaluated. The system is modeled and evaluated by a SIMSCRIPT ii simulation program. The results illustrate that the two algorithms successfully manage disk resources to support more concurrent video stream.

关键词： multimedia systems

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Adaptive and multimodal approach to multimedia content analysis

Adaptive and multimodal approach to multimedia content analy...

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作者： Liu, Zhu Polytechnic University

学位级别：Ph.D.

The volume of multimedia data generated nowadays is exploding. To efficiently access and retrieve desired information, tools that enable automated analysis based on content are becoming indispensable. multimedia content is defined at both perceptual and conceptual levels. The former refers to the content characterized purely by intrinsic perception properties such as color, motion, or acoustic features. The latter refers to the content that is specified based on concepts or semantics such as sunset, anchors, or news headline stories. At both levels, the content is embedded in multiple forms that are usually complimentary to each other. The main objective of this thesis is to adaptively analyze the multimedia content by integrating cues from multiple modalities, including audio, video, and text, mainly in the scope of news broadcast. At the perceptual level, news broadcast data is segmented and classified into different video events such as news reporting and commercials. Audio and visual features are developed and integrated, aiming at discriminating different events effectively. Various classification mechanisms, including linear fuzzy threshold, maximum likelihood using Gaussian Mixture Model and Hidden Markov Model, Neural Network, as well as Support Vector Machine, are benchmarked. At the conceptual level, algorithms and demonstration systems for three applications are developed. In News Broadcast Browsing System, recovering and presentation of the embedded hierarchy structure of news broadcast are addressed. Important semantic objects such as hosting characters and headline news stories are adaptively extracted using the audio/visual models that are bootstrapped from on-line data. The problem of efficient search and retrieval of segmented multimedia objects based on audio is discussed in Query-by-example in Audio System. A distance metric framework is proposed to determine the difference of mixture type Probability Density Functions, and is applied in measuring

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