Dynamic multimedia adaptation and updating of media streams with MPEG-21

The paper discusses media streaming using dynamic resource adaptation and update as a means of facilitating universal multimedia access (UMA): the concept of accessing multimedia content through a variety of possible schemes (Bormans, J. et al., IEEE Sig. Process. Magazine, 2003). As background, the paper summarizes the most common content negotiation approaches and addresses their facets and problems. MPEG-21, the multimedia framework and its relationship to UMA are then explained. Our primary focus is an end-to-end approach to content adaptation which takes advantage of MPEG-21 to facilitate the UMA concept in a media streaming environment. The concept is validated using a media streaming test-bed which provides for wide adaptation according to broad usage descriptions

A Framework for Aggregating Private and Public Web Archives

Personal and private Web archives are proliferating due to the increase in the tools to create them and the realization that Internet Archive and other public Web archives are unable to capture personalized (e.g., Facebook) and private (e.g., banking) Web pages. We introduce a framework to mitigate issues of aggregation in private, personal, and public Web archives without compromising potential sensitive information contained in private captures. We amend Memento syntax and semantics to allow TimeMap enrichment to account for additional attributes to be expressed inclusive of the requirements for dereferencing private Web archive captures. We provide a method to involve the user further in the negotiation of archival captures in dimensions beyond time. We introduce a model for archival querying precedence and short-circuiting, as needed when aggregating private and personal Web archive captures with those from public Web archives through Memento. Negotiation of this sort is novel to Web archiving and allows for the more seamless aggregation of various types of Web archives to convey a more accurate picture of the past Web.Comment: Preprint version of the ACM/IEEE Joint Conference on Digital Libraries (JCDL 2018) full paper, accessible at the DO

Verfahren zur Inhaltsadaption von Darstellungselementen

Dieser Bericht gibt einen Überblick über bekannte Verfahren und Technologien zur automatischen Adaption von Darstellungselementen für mobile Endgeräte, wobei der Schwerpunkt bei Verfahren zur Adaption von Bildern, Videos, Webseiten und Audiodateien liegt. Ziel ist es, basierend auf den Eigenschaften des Endgerätes und den Interaktionsmöglichkeiten, geeignete Darstellungsformate automatisch abzuleiten. Als mögliche Endgeräte werden Mobiltelefone, PDAs, Tablet PCs und Notebook PCs betrachtet. Ein guter Adaptionsalgorithmus sollte eine computergestützte Umformatierung von nur einmal bereit gestellten Inhalten für die verschiedenen Formfaktoren, Auflösungen, Bildschirmgrößen, Interaktionstechniken (Maus, Stift, Touch-Screen usw.) und Netzbandbreiten unterstützen

Supporting Adaptive and Adaptable Hypermedia Presentation Semantics

Having the content of a presentation adapt to the needs, resources and prior activities of a user can be an important benefit of electronic documents. While part of this adaptation is related to the encodings of individual data streams, much of the adaptation can/should be guided by the semantics in and among the objects of the presentation. The semantics involved in having hypermedia presentations adapt can be divided between adaptive hypermedia, which adapts autonomously, and adaptable hypermedia, which requires presentationexternal intervention to be adapted. Understanding adaptive and adaptable hypermedia and the differences between them helps in determining the best manner with which to have a particular hypermedia implementation adapt to the varying circumstances of its presentation. The choice of which type of semantics to represent can affect speed of the database management system processing them. This paper reflects on research and implementation approaches toward both adaptive and adaptable hypermedia and how they apply to specifying the semantics involved in hypermedia authoring and processing. We look at adaptive approaches by considering CMIF and SMIL. The adaptable approaches are represented by the SGML-related collection of formats and the Standard Reference Model (SRM) for IPMS are also reviewed. Based on our experience with both adaptive and adaptable hypermedia, we offer recommendations on how each approach can be supported at the data storage level

Meta data to support context aware mobile applications

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