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1st ACM Workshop on Information Hiding and multimedia Security, IH and MMSec 2013

作者： Merkel, Ronny Otte, Karen Clausing, Robert Dittmann, Jana Vielhauer, Claus Bräutigam, Anja Research Group Multimedia and Security Otto-von-Guericke-University of Magdeburg Germany Department of Informatics and Media Brandenburg University of Applied Sciences Germany State Police Headquarters of Saxony-Anhalt Germany

ISBN: (纸本)9781450320818

Non-invasive high-resolution Chromatic White Light (CWL) measurement devices offer great potential for solving the challenge of latent fingerprints age determination. In this paper, we place 40 prints from different subjects on hard disk platters and capture them from three different indoor locations every week over 1.5 years, acquiring high-resolution time series (10 μm and 20 μm). In contrast to prior findings from Popa et al. (using glass substrates) we show that the ridge thickness of our very precise images does not significantly decrease over time (test goal 1). We furthermore show that pores exhibit a significant loss in contrast and contour, which might lead to the impression of becoming bigger and fewer (test goal 2). Computing the contrast based Binary Pixel aging feature (test goal 3), we observe very characteristic results, leading to the conclusion that the dominant aging property seems to be an overall loss of image contrast rather than a specific change of ridge thickness or pore size. Comparing our findings between three different indoor locations (test goal 4) and discussing them from a police point of view, we conclude that sweat composition, environmental influences and scan parameters have a significant impact on fingerprints long-term aging. © 2013 ACM.

关键词： Substrates

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Authentication Mechanism for Secret Sharing Using Boolean Operation

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Journal of Electronic Science and Technology 2012年第3期10卷 195-198页

作者： Yi-Hui Chen Pei-Yu Lin Department of Applied Informatics and Multimedia Asia University Taichung Department of Information Communication Yuan Ze University Taoyuan

A lossless image secret sharing using a simple Boolean operation is proposed. The concept of visual cryptography in the secret sharing scheme is used to redesign a lossless secret sharing scheme. To ensure that the reconstructed image is the true secret image, an authentication mechanism is imported into the proposed scheme to verify whether the shadows are authentic before reconstructing the secret image. The proposed scheme delivers much more effective performance than Chen and Wu＇s scheme.

关键词： Authentication mechanism visualcryptography visual secret sharing.

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Clinical Practice Guideline Management Information Systems: Cancer Guidelines as Boundary Spanning Tranformable Objects of Practice

Clinical Practice Guideline Management Information Systems: ...

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International Conference on Intelligent Networking and Collaborative Systems (INCOS)

作者： Demosthenes Akoumianakis Giannis Milolidakis Anargyros Akrivos Zacharias Panteris Giorgos Ktistakis Department of Applied Informatics & Multimedia Technological Educational Institute of Crete Crete Greece

The paper elaborates on the concept of transformable boundary artifacts and their role in fostering knowledge-based work in cross-organization virtual communities of practice. The domain of investigation is clinical practice guidelines development for cancer. By reviewing the social worlds involved, we claim that guideline development is a boundary spanning activity which can be facilitated through social networking tools of a Guideline Management Information System. Such a system is then described, focusing on the way it appropriates `plasticity' to make guidelines cross social, institutional and technological boundaries. Contrasting earlier efforts, a key contribution of the research presented is that it emphasizes the dialogue and the intrinsic properties of developing (rather than interpreting) guidelines in collaborative settings.

关键词： Guidelines Collaboration Communities Cancer Information systems Medical diagnostic imaging

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Watermark Selection for Light Field Rendering in FTV

Watermark Selection for Light Field Rendering in FTV

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3DTV Conference

作者： Evlambios E. Apostolidis Georgios A. Triantafyllidis Informatics and Telematics Institute Department of Applied Informatics & Multimedia Technological Educational Institute of Crete Thessaloniki Greece

The recent advances in Image Based Rendering (IBR) has pioneered a new technology, named Free-View Television (FTV), in which the viewers select freely the viewing position and angle of the transmitted multi-view video. In Free-View Television, a person might record a personal video of this arbitrarily selected view and misuse this content, therefore, it is apparent that copyright and copy protection problems exist and should be solved for free- view TV. Among many alternative rights management methods, the copyright problem for visual data is approached by means of embedding hidden imperceptible information, called watermark, into the image and video content. In this paper, we focus on this problem by proposing a simple watermarking scheme. The watermark should not only be resistant to common video processing and multi-view video processing operations, it should also be extracted from a generated video for an arbitrary view. Based on this remark, we evaluate the performance of several watermarks according to their ability to survive in the new generated arbitrary view.

关键词： Watermarking TV Rendering (computer graphics) Cameras Layout Signal processing algorithms Optical arrays Interpolation informatics Educational technology

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HTML5 and WebSockets;challenges in network 3D collaboration 13

HTML5 and WebSockets;challenges in network 3D collaboration

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17th Panhellenic Conference on informatics, PCI 2013

作者： Kapetanakis, Kostas Panagiotakis, Spyros Malamos, Athanasios G. Department of Applied Informatics and Multimedia Technological Educational Institute of Crete Heraklion Crete GR 71004 Greece Department of Sciences Division of Computer Science Technological Educational Institute of Crete Heraklion Crete GR 71004 Greece

ISBN: (纸本)9781450319690

The emergence of HTML5 and other associated web technologies have turned browser applications to cross-platform and device independent ones. In particular HTML5, WebSockets and X3Dom can shape a diversity of future applications, where the client-server operations will be obsolete. The X3Dom technology combines JavaScript, HTML5 and X3D to provide 3D graphics visualization and interaction in a web-browser without a plug-in. Enriched with a WebSockets implementation for maintaining a persistent and bidirectional TCP connection with a server, a web application can communicate, stream and transfer events or other data to its clients creating a full collaborative 3D environment. In this paper, we introduce an architecture for interactive 3D scenes streaming over the web. We also demonstrate a collaborative 3D web-application for preschool children's education that capitalizes on the above technologies. Small classes, real or virtual, can be arranged around an instructor who can control the main 3D scenery. The application can provide a positive and encouraging environment for toddlers to interact with computers while recognizing and playing with 3D animated models of popular animals. Copyright © 2013 ACM.

关键词： Virtual reality

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Temporal coding schemes for energy efficient data transmission in Systems-on-Chip

Temporal coding schemes for energy efficient data transmissi...

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Workshop on Intelligent Solutions in Embedded Systems

作者： George Kornaros Department of Applied Informatics & Multimedia Technological Educational Institute of Crete Crete Greece

ISBN: (纸本)9781424448388

While device technologies continue to shrink, the careful management of the signal integrity issues in Systems-on-Chip is becoming more important due to its impact to delay and power consumption. A class of two new kind of bus encoding schemes exhibiting temporal redundancy is proposed to cope with the energy and delay problems of long on-chip interconnects. They induce no wiring overhead and at the same time are independent from the bus bit width. These novel techniques achieve both to reduce switching activity and the probability of appearance of many crosstalk patterns and even eliminate them. On-chip interconnects in modern multi-core embedded systems with increasing complexity play a crucial role with regard to wiring overhead and power consumption. Contrary to the perception of limited value of bus encoding for SoCs, due to that they prove beneficial only for very long on-chip wires, designers can take advantage of these novel encodings schemes since, it is common to transfer data on-chip without continuous processing. Thus, data can be maintained in encoded format and hence, the designer does not need to consider the overhead imposed by the conversion to the original un-encoded format when transferring data over each intermediate hop.

关键词： Energy efficiency Data communication Encoding Delay Energy consumption Power system interconnection Wiring Energy management Technology management Power system management

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Efficient Certificateless Aggregate Signature Scheme

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Journal of Electronic Science and Technology 2012年第3期10卷 209-214页

作者： Yu-Chi Chen Gwoboa Homg Chao-Liang Liu Yuan-Yu Tsa Chi-Shiang Chan Department of Computer Science and Engineering National Chung-Hsing University Taichung Department of Applied Informatics and Multimedia Asia University Taichung

In ubiquitous computing, data should be able to be accessed from any location, and the correctness of data becomes vital during the communication. Suppose that many users sign different messages respectively, before forwarding or sending these messages, then the verifier must spend a lot of computing time to verify their signatures. Consequently, the aggregate signature scheme is an effective method of improving efficiency in this kind of systems, which provides the convenience for the verifier. In this paper, we propose a new certificateless aggregate signature scheme which is efficient in generating a signature and verification. This scheme is provably secure under the extended computational Diffie-Hellman assumption.

关键词： Aggregate signature certificatelessaggregate signature certificateless cryptography digitalsignature.

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Efficient energy consumption's measurement on android devices

Efficient energy consumption's measurement on android device...

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2012 16th Panhellenic Conference on informatics, PCI 2012

作者： Kapetanakis, Kostas Panagiotakis, Spyros Department of Applied Informatics and Multimedia Technological Educational Institute of Crete Iraklio Crete GR 71004 Greece Department of Sciences Division of Computer Science Technological Educational Institute of Crete Iraklio Crete GR 71004 Greece

ISBN: (纸本)9780769548258

Modern mobile software and hardware is dominated by a paradox: while devices become smaller and services more resource- and energy-demanding, batteries almost maintain size and power. Among them, the multimedia applications consume the most of battery power. By measuring the battery charging level and efficiently estimating the remaining operational time of a portable device, reasonable usage of the device can be advised or appropriate adaptations to be activated. With respect to the measurement of energy consumption, a lot of research has been carried out recently. Most include the setup of a small "in situ" test-bed for conducting measurements via specific power instruments to monitor, gather, measure and analyze usage statistics and battery discharging. In this paper we describe a simple application we have developed using the Android API to collect data for the device's battery. The application logs the charging level of the battery upon the time for future processing. The accuracy of our application has been verified by a small test-bed we set up using an external power measurement tool. Finally, using this application we conducted measurements to estimate the impact of display's brightness and browser's cache on the consumed energy by a web 3D animation. The 3D animation was developed using X3Dom, which provides a cross platform, browser friendly and HTML5 compatible 3D scene. © 2012 IEEE.

关键词： Charging (batteries)

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Realistic multimedia Tools based on Physical Models: II. The Binary 3D Renderer (B3dR)

arXiv

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arXiv 2018年

作者： Pachoulakis, Ioannis Department of Applied Informatics & Multimedia TEI of Crete and Centre for Technological Research of Crete

The present article reports on the second tool of a custom-built toolkit intended to train astronomers into simulating and visualizing the composite 3D structure of winds from hot close double stars by implementing a technique which is similar to multi-directional medical tomography. The flagships of the toolkit are the Spectrum Analyzer and Animator (SA2) and the Binary 3D Renderer (B3dR). Following application of the first tool, SA2 as detailed in paper I, the composite wind structure of the binary has been recovered and the B3dR is subsequently employed to visualize the results and simulate the revolution of the entire system (stars, winds and wind-interaction effects) around the common centre of mass. The B3dR thus repackages the end product of a lengthy physical modeling process to generate realistic multimedia content and enable the presentation of the 3D system from the point of view of an observer on Earth as well as from any other observer location in the Galaxy. Copyright © 2018, The Authors. All rights reserved.

关键词： Spectrum analyzers

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IMS-enabled interactive broadcasting network utilizing peer to peer constellations

IMS-enabled interactive broadcasting network utilizing peer ...

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2012 International Conference on Telecommunications and multimedia, TEMU 2012

作者： Markakis, Evangelos Sideris, Anargyros Anapliotis, Petros Alexiou, Georgios Skianis, Charalabos Pallis, Evangelos Department of Information and Communication Systems Engineering University of the Aegean Samos Greece CNRS LaBRI Lab. University of Bordeaux I France Department of Applied Informatics and Multimedia Technological Educational Institute of Crete Heraklion Greece

ISBN: (纸本)9781467327817

This paper propose an overlay interoperability technology for introducing the concept of Peer to peer (P2P) communications in the context of IP multimedia Subsystem (IMS) enabled interactive broadcasting networks (iDVB-T), bearing the following: a) user initiated conception of communication applications paradigms and deployment, b) access of users on P2P applications from any rural-access network, and c) creation of a new ecosystem of users, emerging different behaviour from the traditional consumers, gearing-up new business and revenue prospects. The overall assessment of the proposed P2P-IMS architecture is evaluated by Real transmission reception experiments justifying the interoperability and validity of the iDVB-T environment proposed. © 2012 IEEE.

关键词： Interoperability

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