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Steganalysis of data hiding techniques in wavelet domain

Steganalysis of data hiding techniques in wavelet domain

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international conference on information technology: coding and computing (itcc)

作者： Shaohui Liu Hongxun Yao Wen Gao Vilab Computer College Harbin Institute of Technology Harbin China

ISBN: (纸本)0769521088

The goal of steganography is to avoid drawing suspicion to the transmission of a hidden message in multi-medium. This creates a potential problem when this technology is misused for planning criminal activities. In this paper, a new steganalysis technique is proposed on the basis of histogram analysis on the wavelet coefficients for the detection the very existence of wavelet domain information hiding techniques. And our approach lays particular stress on methods in which secret message was embedded via quantizating wavelet coefficients. Different statistical discrepancies are obtained by histogram analysis of sub-band wavelet coefficients from stego-images and innocent images. And FFT of these discrepancies are used to form a quantitative criterion to determine whether an image has been embedded secret message or not. Experimental results show that the proposed algorithm is comparable to previously existing techniques.

关键词： Data encapsulation Wavelet domain Wavelet coefficients Histograms Steganography technology planning information analysis Wavelet analysis Stress Image analysis

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Web-based mathematics education: MeML design and implementation

Web-based mathematics education: MeML design and implementat...

引用

international conference on information technology: coding and computing (itcc)

作者： P.S. Wang Yi Zhou Xiao Zou Institute for Computational Mathematics Kent University Kent OH USA

The Web-based mathematics education framework (WME) aims to create a Web for mathematics education. WME empowers mathematics teachers, learning content developers, as well as dynamic mathematics computation and education service providers, to deliver an unprecedented mathematics learning environment to students and educators. Main WME components include the Mathematics Education Markup Language (MeML), the MeML processor (Woodpecker, browser plug-in), and on-Web Mathematics Education Services. MeML provides effective and expressive markup elements to represent and structure mathematics education pages that may also contain XHTML and MathML elements. Woodpecker enables regular Web browsers to process MeML pages and to interact with a wide variety of mathematics computation and education services deployed on the Web.

关键词： Mathematics Internet Access protocols Distributed computing Markup languages Encoding Computer science Databases Libraries Collaborative work

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A problem solving environment for remote sensing data processing

A problem solving environment for remote sensing data proces...

引用

international conference on information technology: coding and computing (itcc)

作者： G. Aloisio M. Cafaro I. Epicoco G. Quarta Center for Advanced Computational Technologies/ISUFI University of Lecce Italy

A huge quantity of Earth observation and geospatial data is produced daily by numerous satellites launched by several worldwide space agencies. The processing of remote sensing data requires several steps, some of which are computationally intensive. The extraction of prominent information from remote sensing data requires a coordinated use of many applications and algorithms. Sharing computational resources among different scientists represents the sole way to approach the problem in order to achieve good performance. We describe a problem solving environment for remote sensing data processing layered on grid technologies. The proposed architecture allows sharing resources among different organizations taking into account each access policy defined by the owner of the resource.

关键词： Problem-solving Remote sensing Data processing Grid computing Portals Synthetic aperture radar interferometry Synthetic aperture radar Distributed computing Application software Space technology

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Improved rate control for advanced video coding (AVC) standard under low delay constraint

Improved rate control for advanced video coding (AVC) standa...

引用

international conference on information technology: coding and computing (itcc)

作者： P. Navakitkanok S. Aramvith Digital Signal Processing Research Laboratory Department of Electrical Engineering Chulalongkom University Bangkok Thailand

The upcoming H.264/MPEG-4 advanced video coding (AVC) video compression standard promises a significant improvement over all previous video compression standards. We study the impact of low delay constraint on the rate control algorithm proposed for AVC, and show that the performance of AVC rate control is degraded under such low delay constraint. This results in PSNR degradation and many skipped frames. We then propose an improved rate control scheme to effectively allocate the number of bits and monitor the buffer fullness. Simulation results show that our proposed rate control scheme encodes the video sequences with less frame skipping and with higher PSNR compared to rate control for AVC.

关键词： Video coding Automatic voltage control Delay MPEG 4 Standard Video compression IEC standards ISO standards Videoconference Degradation PSNR

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Adaptation and reuse in designing Web information systems

Adaptation and reuse in designing Web information systems

引用

international conference on information technology: coding and computing (itcc)

作者： F. Frasincar P. Barna G.-J. Houben Z. Fiala Eindhovan University of Technology Eindhoven Netherlands Dresden University of Technology Dresden Germany

The increasing number of requirements for a Web information system asks for an engineered process in designing such a system. In this paper we focus on two of these requirements: presentation adaptation based on user preferences/device capabilities and reusability of the different design artifacts. Hera is a model-based design methodology for Web information systems. Adaptation and reuse can be tackled at different design levels in Hera. We illustrate by means of examples how adaptation and reuse can be achieved in the conceptual model, the application model, and the presentation model. Based on a static user profile, adaptation is realized by attaching appearance conditions to model elements. With respect to reusability we do focus on one mechanism that supports it, namely inheritance.

关键词： information systems Process design Design methodology Design engineering Joining processes Semantic Web Buildings Navigation Reverse engineering XML

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User interface augmentation: vision and sound

User interface augmentation: vision and sound

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international conference on information technology: coding and computing (itcc)

作者： J.R. Parker M. Baumback Digital Media Laboratory University of Calgary Canada University of Calgary Calgary AB Canada

An example of an enhanced reality user interface uses aspects of the real world and simulated computer perception to yield a simplified user interface. The common application solitaire is considered as the base application. The augmented input scheme uses hand gestures, in particular those that would be used if playing the game with real cards. An augmented output scheme uses audio, especially voice descriptions of cards and relative hand positions, in three dimensions. The result is a game that is playable by anyone using any flat surface with no actual cards and no need to touch or look at the computer. A large class of interfaces can profit from these ideas, and visually impaired users have expanded access to existing systems.

关键词： User interfaces Computer displays Auditory displays Games Mice Laboratories information technology Visualization Control systems Histograms

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The design and implementation of the MESSENGER trajectory database

The design and implementation of the MESSENGER trajectory da...

引用

international conference on information technology: coding and computing (itcc)

作者： J. Gill L. Burge M. Garuba Howard University College of Medicine Washington D.C. DC USA

The MESSENGER trajectory database provides an informative and captivating means of depicting the planned trajectory and mission plan for NASA's MESSENGER Mercury Orbiter Discovery mission scheduled to launch in 2004. The database comprises state of the art in information retrieval techniques to effectively serve the MESSENGER development and operations team, educators, students, broadcast media, and the general public. In addition, database contains features to minimize site maintenance through automation and the creation of standard format files during development and post-launch operation. In this paper we discuss the design and implementation of the MESSENGER trajectory database. In particular, we discuss the architectural design and its integration with NAIF's SPICE toolkit using, XML and J2EE technologies.

关键词： SPICE Space vehicles Spatial databases Trajectory Instruments Kernel information retrieval Broadcasting XML Planets

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Prefetching XML data with abstract query mining

Prefetching XML data with abstract query mining

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international conference on information technology: coding and computing (itcc)

作者： V.T.Y. Ng Chan Chi Kong Shiu Hin Wang Department of Computing Hong Kong Polytechnic University Hong Kong China

Web applications using the XML technologies are increasingly popular. Besides caching, another query performance improvement approach is prefetching. Similar to other database queries, XML queries often have their own query patterns. We present a preprocessing algorithm that extracts abstract queries from similar query constructs but with different constraints values. These abstract queries help to produce useful access patterns by applying association mining on them. Through our preliminary experiments, we found that our prefetching approach improved both the cache hit ratio and precision of the XML cache system.

关键词： Prefetching XML History Association rules Data mining Web pages Databases HTML Delay effects Recommender systems

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A cost-effective critical path approach for service priority optimization in the grid computing economy

A cost-effective critical path approach for service priority...

引用

international conference on information technology: coding and computing (itcc)

作者： M. Lin Z. Lin Department of Computer Sciences University of Texas Austin Austin TX USA The Rawls College of Business Administration Texas Tech University USA

The advancement in the utilization and technologies of the Internet has led to the rapid growth of grid computing; and the perpetuating demand for grid computing resources calls for an incentive-compatible solution to the imminent QoS problem. This paper examines the optimal service priority selection problem that a grid computing network user confronts. We model grid services for a multisubtask request as a prioritized PERT graph and prove that the localized conditional critical path, which is based on the cost-minimizing priority selection for each node, sets the lower bound for the length of cost-effective critical path that commits the optimal solution. We also propose a heuristic algorithm for relaxing the nodes on the noncritical paths with respect to a given critical path.

关键词： Grid computing Costs Delay Quality of service Computer networks Pricing Web and internet services Network servers Power generation economics Throughput

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Digital library resources description

Digital library resources description

引用

international conference on information technology: coding and computing (itcc)

作者： C. Moghrabi T.-H. Le J. Roy J. Hachey ARts-Netlantic CMTC Computer Science Department Université de Moncton Canada

We concern choices that were made during the analysis phase of the ARts-Netlantic project, specifically the database system analysis where digital files are associated to most of the entries in this database. A digital file can be an image, a video, an audio or a text relating to artists and the works of art. Many approaches have been evaluated on how those digital files ought to be inserted in the database. Moreover all digital resources are described with consistency and accuracy. Our research lead us to describe the works of art using the Dublin Core standard and later to use XML to complement those missing attributes that were necessary to adequately describe new media art. The project is under construction, but the way the search engine and the insertions are going to be implemented is discussed.

关键词： Software libraries Art Educational institutions Computer science Image databases information technology Production Database systems Data analysis XML

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