TENCON '97. IEEE Region 10 Annual Conference. Speech and Image Technologies for Computing and Telecommunications., Proceedings of IEEE

4-4 Dec. 1997

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  • TENCON '97 Brisbane - Australia. Proceedings of IEEE TENCON '97. IEEE Region 10 Annual Conference. Speech and Image Technologies for Computing and Telecommunications (Cat. No.97CH36162)

    Publication Year: 1997
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    Freely Available from IEEE
  • Modelling human limits for visual data assimilation

    Publication Year: 1997
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (153 KB)

    Summary form only given. Some aspects of the performance of the human visual system (HVS) have been quantified in psychology and neurology experiments and theories. Much of this knowledge does not extend beyond the early vision stages, and so does not provide an adequate basis for accurate models of how humans perceive particular instances of visual data, such as individual images or sequences of ... View full abstract»

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  • Speech and audio processing for multimedia communications

    Publication Year: 1997
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (49 KB)

    Summary form only given. Multimedia communication involves processing, storage, transmission forwarding, and presentation of audiovisual information, and establishing natural interfaces between systems and their users. The computing, communication and integration infrastructures needed to support multimedia applications are also of great interest. Three of the key technologies in realizing multime... View full abstract»

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  • Speaker characteristics in speech and speaker recognition

    Publication Year: 1997
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (38 KB)

    Summary form only given. This paper analyses the acoustic variability of speakers and its impact on the robustness of contemporary automatic speech recognition and speaker recognition systems. The physiological and behavioural constraints of individual speech articulation are reviewed and examples are given of how these constraints affect commonly used spectral and cepstral features. Speech data f... View full abstract»

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  • Motion estimation in video coding

    Publication Year: 1997
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (46 KB)

    Summary form only given. Motion estimation (ME) is one of the most computational intensive operations in video compression. It can easily account for over 80% of the computation in an MPEG-2 video encoder. Most ME algorithms can be formulated as an optimization problem and the challenge is to avoid being trapped at local minima without the expense of a full search in the optimization space. In thi... View full abstract»

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  • List of authors

    Publication Year: 1997, Page(s):851 - 854
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    Freely Available from IEEE
  • The multifractal property of bursty traffic and its parameter estimation based on wavelets

    Publication Year: 1997, Page(s):791 - 794 vol.2
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    “Fractal” analysis of computer network traffic has been the subject of various studies. Most of the effort has been concentrated on measuring and modeling a possible long range dependence (LRD) process of the traffic trace. However, long range dependence is only one feature of the “fractal” behavior. In this paper, we study rather different properties which are conveniently... View full abstract»

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  • Video segmentation using spatio-temporal information

    Publication Year: 1997, Page(s):785 - 788 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (752 KB)

    This paper presents a new segmentation algorithm that processes segmentation by combining spatial segmentation and motion information. This algorithm uses morphological filters and the watershed algorithm. The proposed segmentation algorithm consists of six parts: preprocessing, image simplification, feature extraction, decision, region merging and postprocessing. By combining spatial and temporal... View full abstract»

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  • A mobile communications application of time-varying higher order spectra to FM signals affected by multiplicative noise

    Publication Year: 1997, Page(s):517 - 520 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    A new method for estimating the instantaneous frequency (IF) of mobile communication signals affected by Rayleigh multiplicative noise is proposed. The method is based on the use of time-varying higher-order spectra (TV-HOS) and particularly the Wigner-Ville trispectrum (WVT). The performance of the method is evaluated under the assumptions of linear FM signals affected by stationary Rayleigh mult... View full abstract»

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  • High-resolution image sequence interpolation

    Publication Year: 1997, Page(s):781 - 784 vol.2
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (620 KB)

    Image interpolation is widely used in various image processing applications. We propose a novel image sequence interpolation technique using a spatio-temporal processing, which can magnify an image with higher resolution than conventional methods. The proposed algorithm is also shown to efficiently reduce noise by using motion compensated temporal filtering View full abstract»

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  • A performance analysis of a cellular SDMA system with an adaptive array

    Publication Year: 1997, Page(s):513 - 516 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    This paper presents a performance analysis of a cellular system which uses an adaptive antenna array in conjunction with a space division multiple access (SDMA) based dynamic channel allocation scheme. The channel allocation scheme is necessary because in SDMA systems there is channel re-use, which must be “intelligently” handled. The system analysed is shown to give significantly impr... View full abstract»

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  • Wavelet transform coding using variable blocksize vector quantization with optimal quadtree segmentation

    Publication Year: 1997, Page(s):715 - 718 vol.2
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (452 KB)

    Wavelet transforms have been applied in image and video compression for the last decade. It decomposes the image into several frequency subbands. It is profitable to combine the variable blocksize vector quantization with wavelet transform coding since there are lots of zeros in the higher frequency subbands. In this paper, we propose an image compression method by applying the variable blocksize ... View full abstract»

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  • Parallel Jacobi-Davidson method for multichannel blind equalization criterium

    Publication Year: 1997, Page(s):847 - 850 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    Some previous works have represented novel techniques that exploit cyclostationarity for channel identification in data communication systems using only second order statistics. In particular, the feasibility of blind identification based on the forward shift structure of the correlation matrices of the source has been shown. In this paper we propose an alternative high performance algorithm based... View full abstract»

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  • Tri-directional filtering in processing a class of ophthalmological images

    Publication Year: 1997, Page(s):687 - 690 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    We present partial results originating from ongoing work on interpretation of a class of ophthalmological images, namely, the posterior capsule opacification (PCO) images acquired at St. Thomas' Hospital, London, in order to monitor the state of a patient's vision after cataract surgery. We concentrate on segmentation of the PCO images using novel tri-directional filters. We compare the results ba... View full abstract»

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  • Video error concealment using decoder motion vector estimation

    Publication Year: 1997, Page(s):777 - 780 vol.2
    Cited by:  Papers (8)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    Audio-visual and other multimedia services are seen as important sources of traffic for future wireless networks. An important characteristic of such networks is that they introduce a significant number of errors into the transmitted digital bitstream. For services' such as video, these errors can have the effect of degrading the quality of the received service to the point where it is unusable. W... View full abstract»

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  • A speech coder with low complexity and optimized codebook

    Publication Year: 1997, Page(s):621 - 624 vol.2
    Cited by:  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    This paper describes a speech coder with low complexity and optimized codebook. A 13 kb/s speech coder is used for upbanded IS-95, a personal communications system (PCS) standard. This speech coder is called Qualcomm code excited linear prediction (QCELP). The QCELP coder uses the closed-loop search for all pitch delays in each pitch subframe. This pitch search requires a large computation time. T... View full abstract»

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  • Mobility analysis of personal communication services (PCS) networks for optimal location area design

    Publication Year: 1997, Page(s):505 - 508 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    As computing devices shrink in size, weight and power, untethering of communication links will make the distinction between communications and computing to be blurred, leading to the new field of personal communication services (PCS). In a PCS environment, computing resources can be used more flexibly because users can be freed from being physically connected to the underlying network. PCS aims at... View full abstract»

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  • Analysis of real-time parallel programs using source-level timing schema

    Publication Year: 1997, Page(s):433 - 436 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    The paper introduces deterministic timing schema or formulae for predicting the best and worst case execution times of real time parallel programs. Timing schema (J. Kim and A.C. Shaw; H.R. Callison and A.C. Shaw) are formulae based on source program elements to calculate the execution time of programs. The total execution time is computed from the schema provided for a variety of parallel program... View full abstract»

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  • The use of the DPT in passive acoustic aircraft flight parameter estimation

    Publication Year: 1997, Page(s):819 - 822 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    Passive acoustic techniques may be used to estimate flight parameters such as the ground speed, altitude and range of a propeller driven aircraft as it passes over an observer. Most techniques used to date are based on estimating the Doppler shifted tone of the propeller blades during the aircraft's transition. Less used is the amplitude of the signal, which also changes due to the variation in di... View full abstract»

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  • A context-based adaptive predictor for use in lossless image coding

    Publication Year: 1997, Page(s):711 - 714 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    In this paper, we propose a context-based adaptive predictor for use in lossless image coding. Most often, lossless image coders utilize non-adaptive linear predictors for the sake of simplicity and to reduce the complexity of the coder. In DPCM-based lossless image coders, adaptivity can result in significant improvements in the performance. However, adaptive prediction is faced with a number of ... View full abstract»

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  • Bootstrap analysis of polynomial amplitude and phase signals

    Publication Year: 1997, Page(s):843 - 846 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    In many areas where it is desirable to be able to estimate the form and parameters of an observed AM/FM signal existing procedures require that assumptions must be made of the distribution of the noise or the form of the signal. This paper presents procedures for estimating both the model order and confidence limits for the coefficients of signals whose amplitude and phase are polynomials. The pro... View full abstract»

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  • A two-stage scene segmentation scheme for the automatic collection of cervical cell images

    Publication Year: 1997, Page(s):683 - 686 vol.2
    Cited by:  Papers (3)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (596 KB)

    A segmentation process which emulates the human method of screening cervical smears is presented. The scheme consists of two distinct stages, one at low magnification using water immersion segmentation, followed by a search based dual active contour method at high magnification. Each technique and the overall method is explained and examples are given View full abstract»

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  • A statistical error detection technique for low bit-rate video

    Publication Year: 1997, Page(s):773 - 776 vol.2
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (532 KB)

    Multimedia services requiring image and video compression are now widely available over fixed telecommunications networks such as cable television networks and the Internet. In the future, these services will also be provided over wireless networks similar to those currently used for digital mobile telephony. As a consequence of the high bit error rates associated with these channels, special erro... View full abstract»

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  • Selection of glottal excitation for low bit rate speech coder with speaker recognizability

    Publication Year: 1997, Page(s):617 - 620 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    We present a low bit rate speech coder with better speaker recognizability using the selection of glottal excitation for each speaker. In order to suitably represent the glottal excitation for each speaker, the excitation pulse determination algorithm used in multi-pulse excited linear predictive coding is adopted. In this system, 25 periodic pulses are determined for a voiced frame. A period of s... View full abstract»

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  • One microsecond fast acquisition 2.4 GHz low voltage frequency synthesizer for frequency-hopping spread spectrum mobile communications

    Publication Year: 1997, Page(s):501 - 504 vol.2
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (452 KB)

    A fast acquisition frequency synthesizer designed for 2.4 GHz band frequency hopping CDMA handheld phones is discussed. The proposed frequency synthesizer can switch to a new channel within one microsecond while operating at 3 V. In order to achieve fast acquisition, low phase noise and low harmonic content under very low supply voltage, special designed voltage controlled oscillator, frequency do... View full abstract»

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