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检索条件"任意字段=1st International Conference on Information Technology: Coding and Computing, ITCC 2000"

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A probabilistic image model for smoothing and compression 1

A probabilistic image model for smoothing and compression

引用

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

作者： Li, C.H. Yuen, P.C. Tam, P.K.S. Department of Computer Science Hong Kong Baptist University Hong Kong Hong Kong Department of Electronic and Information Engineering Hong Kong Polytechnic University Hong Kong Hong Kong

ISBN: (纸本)0769505406

In this paper, the problem of edge preserving smoothing in image processing is tackled by combining a noise corruption model and a region and edge image model. The derivation of the probability model for the first order difference in the gray levels of the region pixels and edge pixels leads to a non-linear filter with coefficients as functions of the estimated noise variance and edge intensity. Such a model-based approach allows the design of improved filters for noise filtering and image compression. Experimental results demonstrate the improved performance of the filter for both synthetic and natural images. © 2000 IEEE.

关键词： Image compression

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A robust digital watermarking based on a statistic approach 1

A robust digital watermarking based on a statistic approach

引用

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

作者： Chen, Pei-Min Department of Computer and Information Science SooChow University Taipei Taiwan

ISBN: (纸本)0769505406

Digital watermarking is an emerging research area for copyright protection of electronic documents and media, which is one of the most important problems to be solved in the cyberspace society. A statistic approach for embedding and extracting a digital watermark on an image is proposed. This approach is based on the realization that a stego-image after watermark attacks should preserve the characteristics of the stego-image if the stego-image after attacks retains its commercial values. In other words, the appearance of the image after attacks is still clearly visible and similar to the original image. This kind of preservation can be reflected as the variances of color levels of pixels both in stego-without-attacks- and stego-with-attacks-images are most likely the same. The embedded digital watermark by this approach seems robust after several attacks are performed on the stego-image. © 2000 IEEE.

关键词： Copyrights

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Noise detection and cleaning by hypergraph model 1

Noise detection and cleaning by hypergraph model

引用

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

作者： Bretto, A. Cherifi, H. Université Jean Monnet LIGIV Site G.I.A.T Industries 3 rue Javelin Pagnon BP 505 Saint-Etienne Cedex 142007 France Universite de Bourgogne UFR Sciences et Techniques LIRSIA BP 47870 Dijon Cedex21078 France

ISBN: (纸本)0769505406

This paper introduces a new algorithm for visual reconstruction of digital images which have been corrupted by mixed noise. From an image hypergraph model we introduce a combinatorial definition of noisy data. A detection procedure is used to classify the hyperedges either as noisy or clean data. Similar to other techniques, the proposed algorithm uses then an estimation procedure to remove the effects of the noise from image data. Numerical simulations demonstrate that this algorithm suppress the effect of the noise while preserving the edges with a high degree of accuracy at a relatively low computational cost. © 2000 IEEE.

关键词： Pattern recognition

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Robust protocols for proving ownership of images 1

Robust protocols for proving ownership of images

引用

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

作者： Ramkumar, M. Akansu, A.N. Department of Electrical and Computer Engineering New Jersey Institute of Technology New Jersey Center for Multimedia Research University Heights NewarkNJ07102 United States

ISBN: (纸本)0769505406

We explore the problem of proving ownership or origin of multimedia content like image/video or audio signals through watermarking. The need for watermarking arises out of the unsuitability of present copyright laws for claiming ownership of digital content. Watermarking schemes however, are threatened by counterfeit attacks, which primarily use the freedom available in the choice of signature or choice of the watermarking method. A restrictive protocol for watermarking could go a long way in rendering counterfeit attacks extremely difficult. We suggest a comprehensive protocol that makes it possible for the true owner to claim ownership unambiguously, while making it extremely difficult for a pirate to do so. © 2000 IEEE.

关键词： Crime

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TASOM: The time adaptive self-organizing map 1

TASOM: The time adaptive self-organizing map

引用

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

作者： Shah-Hosseini, H. Safabakhsh, R. Computer Engineering Department Amirkabir University of Technology Tehran Iran

ISBN: (纸本)0769505406

The time-decreasing learning rate and neighborhood function of the basic SOM (self-organizing map) algorithm reduce its capability to adapt weights for a varied environment. In dealing with non-stationary input distributions and changing environments, we propose a modified SOM algorithm called "time adaptive SOM", or TASOM, that automatically adjusts the learning rate and neighborhood size of each neuron independently. The proposed TASOM is tested with stationary environments and its performance is compared with that of the basic SOM. It is also tested with non-stationary environments for representing the letter 'L', which may be translated, rotated, or scaled. Moreover, the TASOM is used for adaptive segmentation of images which may have undergone gray-level transformation. © 2000 IEEE.

关键词： Self organizing maps

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Transmitting datacubes over congested networks 1

Transmitting datacubes over congested networks

引用

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

作者： Albanese, A. Cannataro, M. Rullo, P. Saccá, D. RealTime Information BerkeleyCA94701 United States ISI-CNR RendeCs87030 Italy Univ. of Calabria RendeCs87030 Italy

ISBN: (纸本)0769505406

Online analytical processing is an emerging technique for the implementation of decision support applications that access remote datacubes over information highways. We propose a novel approach for sending datacubes over congested networks, so that, in order to preserve fast response time, some datacube tuples can be eventually lost but yet preserving a good approximation of the overall datacube. The main idea is to prioritize the datacube information and to send it using a priority-based transmission protocol. The proposed method relies on two well-known techniques: the wavelet decomposition, for the encoding of the datacube into a sequence of prioritized coefficients, and the priority encoding transmission protocol, to deliver them. To reconstruct the datacube with a user-defined error level, priorities are assigned using a thresholding technique. Preliminary experimental results are very encouraging. © 2000 IEEE.

关键词： Wavelet decomposition

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Energy allocation strategies for turbo codes with short frames 1

Energy allocation strategies for turbo codes with short fram...

引用

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

作者： Salah, M.M. Raines, R.A. Temple, M.A. Bailey, T.G. Department of Electrical and Computer Engineering Air Force Institute of Technology Wright-Patterson AFB DaytonOH45433-7765 United States

ISBN: (纸本)0769505406

Turbo codes have been shown to approach the Shannon limit for error correcting capability at low signal-to-noise ratios given large sized frames. Extensive research efforts have been examining ways to enhance the performance of turbo codes for short frames (e.g., voice transmission). One way of enhancing the performance is to optimize the energy allocated to each bit stream to achieve the best performance possible. In standard turbo codes, all bits are transmitted with equal energy. Changing the energy allocation strategy can enhance the performance of turbo codes with short frame lengths. Using computer simulation and analytic bounds, different strategies are discussed and applicability to short frame applications investigated. © 2000 IEEE.

关键词： Signal to noise ratio

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Searching information in large and complex distributed information systems: Balance between implicit and explicit acquisition of the user model 1

Searching information in large and complex distributed infor...

引用

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

作者： Ferri, F. Grifoni, P. Istituto di Studi sulla Ricerca e Documentazione Scientifica CNR Via C. de Lollis 12 Roma00185 Italy

ISBN: (纸本)0769505406

The knowledge about users acquired and formalised through a model may be used in more than one way in an interactive intelligent system. At the higher level, these models may be used for recognition and interpretation of information about the user's behaviour, to provide him with help facilities and a set of useful information. Literature mainly proposes two different strategies devoted to the acquisition of the user models;that is the implicit acquisition and the explicit acquisition. Both the previously introduced approaches are able to satisfy acquisition needs. In particular, this paper proposes an integrated perspective of the two previously introduced approaches and discusses the balance between implicit and explicit acquisition taking into account the user behaviour. The previously introduced problems are treated considering a large and complex distributed information system (i.e. intranet system) in a specific domain: medical folders and medical knowledge bases. © 2000 IEEE.

关键词： Intranets

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A general interleaver for equal and unequal error protections of turbo codes with short frames 1

A general interleaver for equal and unequal error protection...

引用

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

作者： Salah, M.M. Raines, R.A. Temple, M.A. Bailey, T.G. Department of Electrical and Computer Engineering Air Force Institute of Technology Wright-Patterson AFB DaytonOH45433-7765 United States

ISBN: (纸本)0769505406

The key to the efficient operation of turbo codes is the interleaver design. With proper design, the pairing of low-weight sequences to the input of the encoders can be avoided. Circular shift interleavers can be used to ensure that the minimum distance due to weight-2 input sequences grows roughly as √2N, where N is the block length. We generalized the mapping function of the circular shift interleaver to be suitable for both equal and unequal error protections. Also, we present the results of a unique examination of the behavior of the general circular shift interleaver for equal and unequal error protections using turbo code with short frames. © 2000 IEEE.

关键词： Turbo codes

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Empirically derived design issues in auditory information processing for mobile telephony 1

Empirically derived design issues in auditory information pr...

引用

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

作者： Rigas, D.I. Memery, D. Hopwood, D. Rodrigues, M.A. Department of Computer Science University of Hull HullHU6 7RX United Kingdom

ISBN: (纸本)0769505406

This paper investigates empirically design issues in auditory information processing, relevant to interfaces for mobile telephony. This investigation forms the initial part of a larger experimental programme, which aims to investigate design methodologies for auditory-multimedia interfaces. structured musical and environmental audio was used to communicate simple and complex (i.e., larger amounts) information for mobile telephony. The contribution of this paper is in the empirical investigation of the perceptual principles involved in using auditory stimuli to communicate information rather than the mere application of sound in this problem domain. Some of these experiments also aim to communicate information that would normally be communicated using the visual displays of mobile devices. Results indicate perceptual issues that need to be considered in the design process of auditory interfaces. Memory demands on users may in some cases prevent the correct interpretation of the auditory stimuli. Other issues observed to help the designing process of auditory user interfaces include the creation of perceptual context, semantic coding and auditory user interaction model. © 2000 IEEE.

关键词： Semantics

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