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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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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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Using category-based collaborative filtering in the Active WebMuseum

Using category-based collaborative filtering in the Active W...

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1st IEEE International Conference on multimedia and Expo (ICME2000)

作者： Kohrs, A Merialdo, B Inst EURECOM Dept Multimedia Commun F-06904 Sophia Antipolis France

ISBN: (纸本)0780365364

Collaborative filtering is an important technology for creating user-adapting Web sites. In general the efforts of improving filtering algorithms and using the predictions for the presentation of filtered objects are decoupled. Therefore, common measures (or metrics) for evaluating collaborative filtering (recommender) systems focus mainly on the prediction algorithm. It is hard to relate the classic measurements to actual user satisfaction because of the way the user interacts with the recommendations, determined by their representation, influences the benefits for the user. We propose an abstract access paradigm, which can be applied to the design of filtering systems, and at the same time formalizes the access to filtering results via multi-corridors (based on content-based categories). This leads to new measures which better relate to the user satisfaction. We use these measures to evaluate the use of various kinds of multi-corridors for our prototype user-adapting Web site the: Active WebMuseum.

关键词： Computer supported cooperative work

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Mobile Internet over IP data broadcast 10

Mobile Internet over IP data broadcast

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10th International Conference on Telecommunications (ICT 2003)

作者： Paila, T Nokia Electr Ltd Nokia Grp Helsinki Finland

ISBN: (纸本)0780376617

When speaking of wireless and mobile Internet, we often assume that a bi-directional access network must be within reach. Usually we see GPRS, UMTS and wireless LANs as carriers supporting the Internet access service. This service consequently provides a basis for browsing and retrieving a wealth of digital multimedia content upon user request. However, there are alternative means to deliver digital content to mobile users. Indeed, general content and content formats are independent from various communication methods. In this paper we focus on an alternative content delivery method - content push over terrestrial IP data broadcasting. To give a concrete context for discussion we assume DVB-T as transmission technology. The unidirectional, wide-band, shared channel suits especially well delivery service that targets multiple end users on the move. Applied to mobile communications, IP data broadcasting proves to complement the traditional mobile Internet access service provided over bi-directional access systems. From the viewpoint of international standards developing organizations, we tackle the issues needed to establish a globally inter-operable IP datacast baseline as a service platform.

关键词： 3G mobile communication Bidirectional control Broadcasting content based retrieval Ground penetrating radar IP networks Mobile communication multimedia communication Web and internet services Wireless LAN

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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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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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The MPEG-4 video standard verification model

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IEEE TRANSACTIONS ON CIRCUITS AND systems FOR VIDEO TECHNOLOGY 1997年第1期7卷 19-31页

作者： Sikora, T Laboratory of Chromatography DEPg.Fac.Quimica Universidad Nacional Autonoma de Mexico Circuito interior Cd Universitaria/CP 04510 Mexico D.F.Mexico

The MPEG-4 standardization phase has the mandate to develop algorithms for audio-visual coding allowing for interactivity, high compression, and/or universal accessibility and portability of audio and video content. In addition to the conventional ''frame''-based functionalities of the MPEG-1 and MPEG-2 standards, the MPEG-4 video coding algorithm will also support access and manipulation of ''objects'' within video scenes. The January 1996 MPEG Video group meeting witnessed the definition of the first version of the MPEG-4 Video Verification Model-a milestone in the development of the MPEG-4 standard. The primary intent of the Video Verification Model is to provide a fully defined core video coding algorithm platform for the development of the standard. As such, the structure of the MPEG-4 Video Verification Model already gives some indication about the tools and algorithms that will be provided by the final MPEG-4 standard. The purpose of this paper is to describe the scope of the MPEG-4 Video standard and to outline the structure of the MPEG-4 Video Verification Model under development.

关键词： coding efficiency compression error robustness flexible coding functional coding manipulation MPEG MPEG-4 multimedia natural video object-based coding SNHC standardization synthetic video universal accessibility verification model video coding

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CONIVAS: content-based Image and Video access System 96

CONIVAS: CONtent-based Image and Video Access System

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Proceedings of the 1996 4th ACM International multimedia Conference

作者： Abdel-Mottaleb, Mohamed Dimitrova, Nevenka Desai, Ranjit Martino, Jacquelyn Philips Research Briarcliff Manor United States

ISBN: (纸本)9780897918718

content-base Image and Video access System (CONIVAS) consists of a collection of tools to help users retrieve still images and videos from databases by content. The system includes new algorithms for image and video retrieval which can be used in searching large collections of images and video clips such as digital video library, professional video editing, TV news retrieval, and copyright protection applications.

关键词： Information retrieval systems

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Automatic violent content web filtering approach based on the KDD process

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INTERNATIONAL JOURNAL OF WEB INFORMATION systems 2008年第4期4卷 441-+页

作者： Hammami, Mohamed Guermazi, Radhouane Ben Hamadou, Abdelmajid Multimedia Informat Syst & Adv Comp Lab Sfax Tunisia

Purpose - The growth of the web and the increasing number of documents electronically available has been paralleled by the emergence of harmful web pages content such as pornography, violence, racism, etc. This emergence involved the necessity of providing filtering systems designed to secure the internet access. Most of them process mainly the adult content and focus on blocking pornography, marginalizing violence. The purpose of this paper is to propose a violent web content detection and filtering system, which uses textual and structural content-based analysis. Design/methodology/approach - The violent web content detection and filtering system uses textual and structural content-based analysis based on a violent keyword dictionary. The paper focuses on the keyword dictionary preparation, and presents a comparative study of different data mining techniques to block violent content web pages. Findings - The solution presented in this paper showed its effectiveness by scoring a 89 per cent classification accuracy rate on its test data set. Research limitations/implications - Many future work directions can be considered. This paper analyzed only the web page, and an additional analysis of the visual content can be one of the directions of future work. Future research is underway to develop effective filtering tools for other types of harmful web pages, such as racist, etc. Originality/value - The paper's major contributions are first, the study and comparison of several decision tree building algorithms to build a violent web classifier based on a textual and structural content-based analysis for improving web filtering. Second, showing laborious dictionary building by finding automatically discriminative indicative keywords.

关键词： Worldwide web Classification schemes Data analysis content management

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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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