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Joint source-channel coding using simplified block-based segmentation and content-based rate-control for wireless video transport

Joint source-channel coding using simplified block-based seg...

引用

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

作者： S. Aramvith H. Kortrakulkij D. Tancharoen S. Jitapankul Digital Signal Processing Research Laboratory Department of Electrical Engineering Chulalongkom University Bangkok Thailand

The scenario of using Automatic Repeat reQuest (ARQ) retransmission for two-way low bit-rate video communications over wireless Rayleigh fading channels is studied. In this kind of channel, the packets inevitably experience errors during deep fades. The retransmissions can be used to re-send such packets. During retransmissions, the video encoder buffer fills up quickly and may cause the rate-control algorithm to skip frames or allocate less number of bits to encode the video frame. To reduce the number of frames skipped and improve bit allocation, we propose a content-based rate-control scheme using simplified block-based segmentation to intelligently allocate more bits to the foreground region. In addition, our proposed scheme also takes into consideration the effects of the video buffer fill-up, an a priori channel model, channel feedback information. The simulation results indicate that our proposed scheme encodes the video sequences with higher quality on the foreground region and much fewer frame skipping as compared to H.263 TMN8.

关键词： Image segmentation Automatic repeat request Video compression Fading Bit rate Feedback Face detection Change detection algorithms Digital signal processing Wireless communication

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The object behavior of Java object-oriented database management systems

The object behavior of Java object-oriented database managem...

引用

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

作者： C.-T.D. Lo M. Chang O. Frieder D. Grossman Department of Computer Science Illinois Institute of Technology Chicago IL USA

Due to its portability and popularity for Internet applications, Java has become one of the major programming languages. The similar syntax inherited from the C language and the pure object oriented features, compared to the non-pure object-oriented C++ language, have caused Java to be a good candidate as a tool in designing object oriented systems, especially in database servers. However the performance of the Java Virtual Machine (JVM) is the reason that several database designers, such as Oracle, IBM, Sybase and Informix, have not fully transferred their database management system (DBMS) into Java. One of the performance indices is the responsiveness for online transaction processing (OLTP) which may be dominated by the garbage collection system inside the JVM. In this paper eight Java programs, jess, javac, mtrt, compress, db, db4o, smallDB and ozone, are used to study the dynamic memory behavior. The latter four programs are Java object-oriented database management systems and their object behaviors are compared to those of the four regular Java programs. Simulation results such as object size distribution, average object size, object live distribution and total garbage collection cycle are reported.

关键词： Java Database systems Object oriented databases Spatial databases Transaction databases Internet Computer languages Virtual machining Delay Object oriented modeling

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Power: a metric for evaluating watermarking algorithms

Power: a metric for evaluating watermarking algorithms

引用

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

作者： R. Sion M. Atallah S. Prabhakar Computer Sciences Center for Education and Research in Information Assurance and Security (CERIAS) Purdue University West Lafayette IN USA CERIAS Computer Sciences Purdue University Computer Sciences Purdue University NULL

An important parameter in evaluating data hiding methods is hiding capacity (Cohen et al., 1999) i.e. the amount of data that a certain algorithm can "hide" until reaching allowable distortion limits. One fundamental difference between watermarking (Cox et al., 1997; 1999) and generic data hiding resides exactly in the main applicability and descriptions of the two domains. In the digital framework, watermarking algorithms that make use of information hiding techniques have been developed and hiding capacity was naturally used as a metric in evaluating their power to hide information. Whereas the maximal amount of information that a certain algorithm can "hide" (while keeping the data within allowable distortion bounds) is certainly related to the ability to assert ownership in court, it is not directly measuring its power of persuasion, in part also because it does not consider directly the existence and power of watermarking attacks. We show why, due to its particularities, watermarking requires a different metric, more closely related to its ultimate purpose, claiming ownership in a court of law. We define one suitable metric (watermarking power) and show how it relates to derivates of hiding capacity. We prove that there are cases where considering hiding capacity is sub-optimal as a metric in evaluating watermarking methods whereas the metric of watermarking power delivers good results.

关键词： Watermarking Data encapsulation Steganography information security Usability Home computing Computer science education Computer security Distortion measurement Power measurement

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Call for papers: Special session on information retrieval international conference on information technology: coding and computing (itcc 2002) The Orleans, Las Vegas, Nevada, USA April 8–10, 2002 sponsored by the IEEE computer society

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Journal of the Association for information Science and technology 2001年第14期52卷

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Proceedings - international conference on information technology: coding and computing, itcc 2000

Proceedings - International Conference on Information Techno...

引用

1st international conference on information technology: coding and computing, itcc 2000

ISBN: (纸本)0769505406

The proceedings contain 85 papers. The topics discussed include: searching and filtering of audio-visual information: technologies, standards, and applications;dequantization bias for JPEG decompression;a probabilistic image model for smoothing and compression;application specific image compression forvirtual conferencing;media-independent watermarking classification and the need for combining digital video and audio watermarking for media authentication;a spatial digital video watermark that survives MPEG;overview of interference cancellation for CDMA wireless systems;wireless multimedia communication through multichannel multipoint distribution service;advanced signal processing for wireless multimedia communications;simple collosion-secure fingerprinting schemes for images;and digital watermarking using inter-block correlation: extension to JPEG coded domain.

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Speech content integrity verification integrated with ITU G.723.1 speech coding

Speech content integrity verification integrated with ITU G....

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2nd international conference on information technology - coding and computing (itcc 2001)

作者： Wu, CP Kuo, CCJ Univ So Calif Dept Elect Engn Syst Los Angeles CA 90089 USA

ISBN: (纸本)0769510620

A speech content integrity verification scheme integrated with ITU G 723.1 speech coding to minimize the total computational cost is proposed in this research. Speech features relevant to the semantic meaning are extracted, encrypted and attached as the header information. This scheme is not only much faster than cryptographic bitstream integrity algorithms, but also more compatible with a variety of applications. The speech signal could go through recompression, amplification, transcoding, re-sampling, D/A and A/D conversion and minor white noise pollution without triggering the verification alarm.

关键词： White noise

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Optimal algebraic coding of noisy and distorted images

Optimal algebraic coding of noisy and distorted images

引用

2nd international conference on information technology - coding and computing (itcc 2001)

作者： Kalyuzhny, A Kovtonyuk, A DELTA SPE Kiev Ukraine

ISBN: (纸本)0769510620

The traditional approach to coding of noisy and distorted images assumes preliminary enhancement and restoring of images and only then in fact their coding. In the given work novel technique is proposed, where the indicated procedures are combined in the optimum algebraic coding. At the heart of the offered approach is the optimization of coordinate basis of an image representation. If is shown, that the required optimum properties have the. eigenfunctions of the Fisher's information operator known in thc statistical theory of estimation. These functions satisfying defined criterions of a selection are called in the paper as Principal Iinformative Components (PIC). PIC-projection technique for improvement of an arbitrary image decomposition is proposed. The given technique allows at anyone primary physical representation of an image to decrease a statistical errror or of its coding oil a noisy data.

关键词： Eigenvalues and eigenfunctions

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Adapting information presentation and retrieval through user modelling

Adapting information presentation and retrieval through user...

引用

2nd international conference on information technology - coding and computing (itcc 2001)

作者： Bogonikolos, N Makris, C Tsakalidis, A Vassiliadis, B Dept Comp Engn & Informat Patras 26500 Greece

ISBN: (纸本)0769510620

The amount of structured information available in Internet sources is rapidly increasing. This information includes commercial databases on product information and information on e-services forming the so-called e-shops. However. the process of using this information has become more complicated, and can sometimes be tedious for users with different goals, interests, levels of expertise, abilities and preferences. This paper deals with the definition of an architectural framework for intelligent, adaptive and personalised navigation within large hypertext Electronic Commerce environments.

关键词： Hypertext systems

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Towards efficient multi-feature queries in heterogeneous environments

Towards efficient multi-feature queries in heterogeneous env...

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2nd international conference on information technology - coding and computing (itcc 2001)

作者： Güntzer, U Balke, WT Kiessling, W University of Tübingen Germany University of Augsburg Germany

ISBN: (纸本)0769510620

Applications like multimedia databases or enterprise-wide information management systems have to meet the challenge of efficiently retrieving best matching objects from vast collections of data. We present a new algorithm Stream-Combine for processing multi-feature queries on heterogeneous data sources. Stream-Combine is self-adapting to different data distributions and to the specific kind of the combining function. Furthermore we present a new retrieval strategy that will essentially speed rtp the output of relevant objects.

关键词： information management

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Multiple description image coding using pre- and post-processing

Multiple description image coding using pre- and post-proces...

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2nd international conference on information technology - coding and computing (itcc 2001)

作者： Shirani, S Gallant, M Kossentini, F McMaster Univ Dept Elect & Comp Engn Hamilton ON Canada

ISBN: (纸本)0769510620

We address the problem of robust transmission of compressed visual information over unreliable networks. Our approach employs the principle of multiple-descriptions, through pre- and post-processing of the image data, without modification to the source or channel codecs. We employ oversampling to add redundancy to the original image data followed by a partitioning of the oversampled image into "equal" sub-images which can be coded and transmitted over separate channels. Simulations using two descriptors show that this approach yields exceptional performance when only one descriptor is received and outperforms other popular multiple description approaches.

关键词： Image coding

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