Fourth International Conference on Information, Communications and Signal Processing, 2003 and the Fourth Pacific Rim Conference on Multimedia. Proceedings of the 2003 Joint

15-18 Dec. 2003

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  • Design and implementation of a rate-scalable wireless local area network

    Publication Year: 2003, Page(s):1469 - 1473 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (451 KB) | HTML iconHTML

    Future wireless local area networks are to support a wide spectrum of devices that run different applications with widely different traffic characteristics. For example, a motion sensor may generate traffic at a rate of a few bytes every second while a video player may transmit a few Mbps. Considering the fact that data packets are transmitted in bursts at the peak transmission rate, different dev... View full abstract»

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  • Signature scheme based on composite discrete logarithm

    Publication Year: 2003, Page(s):1702 - 1706 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (431 KB) | HTML iconHTML

    In this paper, we proposed a digital signature scheme based on composite discrete logarithm. We show that the proposed scheme is secure against existential forgery under adaptive chosen-message attack relative to the hardness of discrete logarithm. Furthermore, we show that the proposed scheme is not only computationally efficient but is also more efficient than the other schemes. In signature gen... View full abstract»

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  • Narrowband interference suppression in CDMA using random walk tracking algorithm

    Publication Year: 2003, Page(s):1465 - 1468 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (315 KB) | HTML iconHTML

    It has been shown that the narrowband interference suppression capability of a direct sequence spread spectrum system can be enhanced considerably by processing the received signal via a prediction error filter prior to correlating it with the pseudo noise (PN) sequence. In this paper we present a new method to suppress narrowband interference in direct sequence code division multiple access (DS-C... View full abstract»

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  • Predicting nonlinear network traffic using fuzzy neural network

    Publication Year: 2003, Page(s):1697 - 1701 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (353 KB) | HTML iconHTML

    Network traffic is a complex and nonlinear process significantly affected by immeasurable parameters and variables. This paper addresses the use of the five-layer fuzzy neural network (FNN) for predicting the nonlinear network traffic. The structure of this system is introduced in detail. Through training the FNN using back-propagation algorithm with inertial terms the traffic series can be well p... View full abstract»

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  • Multicast distributed routing algorithm for providing network QoS

    Publication Year: 2003, Page(s):1977 - 1981 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (443 KB) | HTML iconHTML

    Multicast routing is widely used by various media applications (teleconference, distance learning...). The combination of multicast routing and quality of service (QoS) characteristics helps handling the technical requirements and brings better services to end-users. This paper proposes an extension of distributed routing algorithm (DRA) for supporting multicast routing. The proposed algorithm is ... View full abstract»

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  • Performance analysis of leaky-bucket controlled Pareto-distributed on/off sources

    Publication Year: 2003, Page(s):1685 - 1696 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (636 KB) | HTML iconHTML

    An approximate performance analysis of a leaky bucket with Pareto-distributed on/off sources is presented. The aggregate of Pareto-distributed on/off sources is a self-similar traffic. This analysis is applicable to the leaky bucket policing device at the ingresses of (1) a base station in a wireless ATM network, (2) a wireline ATM network, and (3) future generations of IP-based networks with qual... View full abstract»

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  • A novel nonparametric clustering algorithm for discovering arbitrary shaped clusters

    Publication Year: 2003, Page(s):1826 - 1830 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (405 KB) | HTML iconHTML

    Most existing clustering algorithms have at least one of the two following problems. They either require users to carefully set or tune some predefined parameters, or they have difficulty in discovering arbitrary shaped clusters. To solve these two problems, a nonparametric clustering algorithm called MinClue (MINimum spanning tree based CLUstEring) aiming at discovering arbitrary shaped clusters ... View full abstract»

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  • Correlative coding with clipping and filtering technique in OFDM systems

    Publication Year: 2003, Page(s):1456 - 1459 vol.3
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (342 KB) | HTML iconHTML

    The major setbacks of orthogonal frequency multiplexing (OFDM) are its peak-to-average power ratio (PAPR) and intercarrier interference (ICI). The occurrence of these factors restricts its application. Here, the clipping and filtering PAPR reduction technique is being investigated to reduce the PAPR and out-of-band radiation simultaneously by implementing correlative coding. This paper focuses on ... View full abstract»

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  • Unequal packet loss protected transmission for FGS video

    Publication Year: 2003, Page(s):1972 - 1976 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (361 KB) | HTML iconHTML

    Video communication with quality of service (QoS) is an important and challenging task. The transmitted video stream must be able to afford the bandwidth variance and unavoidable packet loss in the Internet. In particular, fine-granular-scalability (FGS) video coding has been adopted by the MPEG-4 standard as the core video-compression method for streaming applications. In this paper, we use unequ... View full abstract»

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  • A novel low-complexity packetization method for fine-granularity scalable (FGS) video streaming

    Publication Year: 2003, Page(s):1375 - 1379 vol.3
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (430 KB) | HTML iconHTML

    Pre-packetization is extensively used in commercial streaming systems to support simultaneously accessing the same content by a large number of audiences while controlling the server load. However, for FGS video, such a pre-packetization scheme may limit the fine-grain scalability provided by FGS and partially sacrifice FGS advantages. To deal with this issue, a novel low-complexity packetization ... View full abstract»

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  • A novel OPTOC-based clustering algorithm for gene expression data analysis

    Publication Year: 2003, Page(s):1427 - 1431 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (375 KB) | HTML iconHTML

    Cluster analysis of gene expression data is useful for identifying biologically relevant groups of genes. However, finding the correct clusters in the data and estimating the correct number of clusters are still two largely unsolved problems. In this paper, we propose a new clustering framework that is able to address both these problems. By using the one-prototype-take-one-cluster (OPTOC) competi... View full abstract»

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  • Note on the problem of partially link disjoint paths

    Publication Year: 2003, Page(s):1680 - 1684 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (453 KB) | HTML iconHTML

    This paper discusses the problem of partially link disjoint paths in communication networks. The problem is situated in between the well-known shortest path generation and the synthesis of two disjoint paths. The contributions of this paper are twofold: firstly, topologies and relevant graph properties are investigated and the degree of divergence is defined as a metric to distinguish the degree o... View full abstract»

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  • Employing negative examples in region-based image retrieval

    Publication Year: 2003, Page(s):1600 - 1603 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (345 KB) | HTML iconHTML

    In this paper, the integration of negative examples into an efficient region-based image retrieval framework is investigated. The outputs of a support vector machine that separates positive images from negative ones are used to refine the current retrieval result. Considering the speciality of region-based representation, a kind of new kernel is proposed, which is the generalization of Gaussian ke... View full abstract»

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  • Modeling continuous visual speech using boosted viseme models

    Publication Year: 2003, Page(s):1394 - 1398 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (397 KB) | HTML iconHTML

    In this paper, a novel connected-viseme approach for modeling continuous visual speech is presented. The approach adopts AdaBoost-HMMs as the viseme models. Continuous visual speech is modeled by connecting the viseme models using level building algorithm. The approach is applied to identify words and phrases in visual speech. The recognition results indicate that the proposed method has better pe... View full abstract»

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  • Applying neural network on the content-based audio classification

    Publication Year: 2003, Page(s):1821 - 1825 vol.3
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (374 KB) | HTML iconHTML

    Many audio and multimedia applications would benefit if they could interpret the content of audio rather than relying on descriptions or keywords. These applications include multimedia databases and file systems, digital libraries, automatic segmentation or indexing of video (e.g., news or sports storage), and surveillance. This paper describes a novel content-based audio classification approach b... View full abstract»

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  • A power efficient algorithm for power/rate control in wireless transmission

    Publication Year: 2003, Page(s):1451 - 1455 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (379 KB) | HTML iconHTML

    We propose the Lagrangian relaxation power and rate control (LRPRC) algorithm, which achieves relatively higher average system throughput, but with substantially lower power consumption and comparable outage probability when compared to two previously published schemes in S. L. Kim, et al. (Sept. 1999). We find that these are achieved by lowering the data rates of users with unfavorable channel co... View full abstract»

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  • New ARQ protocol for interactive video over data networks

    Publication Year: 2003, Page(s):1967 - 1971 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB) | HTML iconHTML

    In this paper we introduce a new ARQ protocol for resilient multicast interactive video applications over error-prone LANs and MANs. Our proposal maximizes overall video quality and channel capacity in a session by means of coding and transmission policies based on communication statistics feedback. Transmitters prioritize session members with best reception statistics to take advantage of the hig... View full abstract»

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  • Realistic 3D facial animations with subtle texture changes

    Publication Year: 2003, Page(s):1762 - 1766 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (573 KB) | HTML iconHTML

    Illumination variance in texture is an important aspect of facial animation. Traditional facial animation techniques consider only facial feature geometric changes, but subtle texture changes in illumination are ignored. In this paper, by applying subtle illumination changes we present a novel technique to get realistic 3D facial animations. Firstly, we give the concept of PERI (partial expression... View full abstract»

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  • A new bit rate control strategy for H.264

    Publication Year: 2003, Page(s):1370 - 1374 vol.3
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB) | HTML iconHTML

    On the coding platform of H.264, the bit rate of multimode motion compensated frame difference presents some new statistical character, which makes the conventional rate models inefficient. In this article we present a new rate control scheme for H.264 at macroblock layer based on a new model. The results of experiments show that the proposed rate control method is more efficient, especially for t... View full abstract»

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  • Computer-based Malay articulation training for Malay plosives at isolated, syllable and word level

    Publication Year: 2003, Page(s):1423 - 1426 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (359 KB) | HTML iconHTML

    This paper describes the use of computer as an articulation training system for Malay plosives at isolated, syllable and word level. The proposed system is more convenient than the traditional speech analyzing tools such as electropalatograph, where the latter requires an external electronic circuit to be attached into the mouth of client. The system is designed in a way that is user friendly and ... View full abstract»

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  • A novel architecture for floating-point multiply-add-fused operation

    Publication Year: 2003, Page(s):1675 - 1679 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (307 KB) | HTML iconHTML

    The multiply-add-fused (MAF) operation is very important in many scientific and engineering applications. In this paper, a novel architecture for the MAF operation is presented. According to the fact that some steps of MAF operation are mutually exclusive, the composing steps are organized into two data-paths, and each data-path only contains the indispensable computation steps. One takes effect w... View full abstract»

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  • Fuzzy relevance feedback in content-based image retrieval

    Publication Year: 2003, Page(s):1595 - 1599 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (447 KB) | HTML iconHTML

    In this paper, a new notion called fuzzy relevance feedback in interactive content-based image retrieval (CBIR) systems is introduced. Conventional binary labeling scheme requires a crisp decision to be made on the relevance of the retrieved images. However, user interpretation varies with respect to different information needs and perceptual subjectivity. In addition, users tend to learn from the... View full abstract»

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  • An SGH-tree based efficient Huffman decoding

    Publication Year: 2003, Page(s):1483 - 1487 vol.3
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB) | HTML iconHTML

    Huffman code [D. A. Huffman, Sept. 1952] is the most well-known and widely used variable-length codes (VLCs) for compressing various kinds of data. Conventional table lookup and/or bit-serial decoding techniques for realizing VLCs are inefficient in memory usage and/or computation time. In this paper, we investigated some existing memory efficient VLC decoding methods [R. Hashemian, 1995], [K. L. ... View full abstract»

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  • On the improvement of scalable MPEG-4 CELP at low bitrate

    Publication Year: 2003, Page(s):1389 - 1393 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB) | HTML iconHTML

    CELP (code-excited linear predictive), one of the speech coding techniques, is a part of the MPEG-4 standard. The distinct feature of the MPEG-4 CELP is that it has the bitrate and bandwidth scalability for different users with different network bandwidth. However, subjective experiments show that the scalable mechanism of the MPEG-4 CELP does not perform well at low core bitrates, e.g., 3.85 kbps... View full abstract»

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  • Effective image browsing on mobile devices: a region-based approach

    Publication Year: 2003, Page(s):1777 - 1781 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (471 KB) | HTML iconHTML

    Pictures have become increasingly common and popular in mobile communications. However, due to the limitation of mobile devices, it is necessary to develop new technologies to facilitate the browsing of large pictures on small displays. In this paper, we propose a novel image viewing technique based on a region-based image representation. A constrained image segmentation algorithm is introduced to... View full abstract»

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