2,353 research outputs found
Modelling of content-aware indicators for effective determination of shot boundaries in compressed MPEG videos
In this paper, a content-aware approach is proposed to design multiple test conditions for shot cut detection, which are organized into a multiple phase decision tree for abrupt cut detection and a finite state machine for dissolve detection. In comparison with existing approaches, our algorithm is characterized with two categories of content difference indicators and testing. While the first category indicates the content changes that are directly used for shot cut detection, the second category indicates the contexts under which the content change occurs. As a result, indications of frame differences are tested with context awareness to make the detection of shot cuts adaptive to both content and context changes. Evaluations announced by TRECVID 2007 indicate that our proposed algorithm achieved comparable performance to those using machine learning approaches, yet using a simpler feature set and straightforward design strategies. This has validated the effectiveness of modelling of content-aware indicators for decision making, which also provides a good alternative to conventional approaches in this topic
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
ARCHANGEL: Tamper-proofing Video Archives using Temporal Content Hashes on the Blockchain
We present ARCHANGEL; a novel distributed ledger based system for assuring
the long-term integrity of digital video archives. First, we describe a novel
deep network architecture for computing compact temporal content hashes (TCHs)
from audio-visual streams with durations of minutes or hours. Our TCHs are
sensitive to accidental or malicious content modification (tampering) but
invariant to the codec used to encode the video. This is necessary due to the
curatorial requirement for archives to format shift video over time to ensure
future accessibility. Second, we describe how the TCHs (and the models used to
derive them) are secured via a proof-of-authority blockchain distributed across
multiple independent archives. We report on the efficacy of ARCHANGEL within
the context of a trial deployment in which the national government archives of
the United Kingdom, Estonia and Norway participated.Comment: Accepted to CVPR Blockchain Workshop 201
On Content-centric Wireless Delivery Networks
The flux of social media and the convenience of mobile connectivity has
created a mobile data phenomenon that is expected to overwhelm the mobile
cellular networks in the foreseeable future. Despite the advent of 4G/LTE, the
growth rate of wireless data has far exceeded the capacity increase of the
mobile networks. A fundamentally new design paradigm is required to tackle the
ever-growing wireless data challenge.
In this article, we investigate the problem of massive content delivery over
wireless networks and present a systematic view on content-centric network
design and its underlying challenges. Towards this end, we first review some of
the recent advancements in Information Centric Networking (ICN) which provides
the basis on how media contents can be labeled, distributed, and placed across
the networks. We then formulate the content delivery task into a content rate
maximization problem over a share wireless channel, which, contrasting the
conventional wisdom that attempts to increase the bit-rate of a unicast system,
maximizes the content delivery capability with a fixed amount of wireless
resources. This conceptually simple change enables us to exploit the "content
diversity" and the "network diversity" by leveraging the abundant computation
sources (through application-layer encoding, pushing and caching, etc.) within
the existing wireless networks. A network architecture that enables wireless
network crowdsourcing for content delivery is then described, followed by an
exemplary campus wireless network that encompasses the above concepts.Comment: 20 pages, 7 figures,accepted by IEEE Wireless
Communications,Sept.201
Music-4you.com - digital music e-commerce case study
During the past couple of years a new business has arise on the Internet – digital music e-commerce. Web-sites such as Apple iTunes, Real Rhapsody and most recently the renewed version of Napster with Microsoft support have attracted a lot of attention to this new business. This paper introduces and describes an example of a digital music e-commerce web-site – Music-4You.com – developed in the framework of a European project called MOSES. However, Music-4you isn’t just another digital music e-commerce site. It introduces some new concepts in the electronic trading of digital music, such as the negotiation of rights licensing conditions, the usage of new media formats and the possibility of music providers add their own music to the web-site and to define their own business models and rights management.info:eu-repo/semantics/acceptedVersio
Open secure infrastructure to control user access to multimedia content
This paper will start by describing OpenSDRM an open-source framework developed for the IST project MOSES., OpenSDRM is used to control the multimedia content consumption in conjunction with the new IPMPX MPEG-4 proposed standard. This architecture, composed by several building blocks, protects the content flow from creation to final user consumption on a specific device. This paper devotes a special attention to the security aspects of the OpenSDRM processes and functions, describing its communication protocols and message exchanges as well as it introduces the security details about the user's digital wallet.info:eu-repo/semantics/acceptedVersio
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