1996 IEEE Digital Signal Processing Workshop Proceedings

1-4 Sept. 1996

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  • 1996 IEEE Digital Signal Processing Workshop Proceedings

    Publication Year: 1996
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    Freely Available from IEEE
  • Critical band quantisation analysis for masked distortion speech coding

    Publication Year: 1996, Page(s):165 - 168
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    This paper presents new results on critical band masked distortion controlled quantisation of a linear transform representation of speech. In particular, fixed rate split vector quantisation of a critical band gain vector is investigated. While shown to be objectively significant in meeting masked distortion criteria, near-transparent quantisation of the critical band gain spectrum is nonetheless ... View full abstract»

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  • Signal representation and reconstruction from partial information in the position-frequency space

    Publication Year: 1996, Page(s):279 - 282
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    Motivated by the human visual system, where both spectral phase and overlapping receptive fields play major roles, we develop conditions for unique representation of a signal by a combination of its spectral (Fourier) phase and spatial samples. Methods for signal reconstruction from the given combined information are introduced. It is concluded that most of the previous results in the area of Four... View full abstract»

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  • Sub-band, dual-channel adaptive noise cancellation using normalised LMS

    Publication Year: 1996, Page(s):327 - 330
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (517 KB)

    An adaptive noise cancellation scheme for speech processing is described. Adaptive filters are implemented in sub-bands, based on a model of the human cochlea. A modification to the LMS structure is introduced which guarantees stability and convergence. This modification, a non-recursive normalisation, is used both in a wideband and in a sub-band implementation of the scheme. The effect of this no... View full abstract»

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  • Author index

    Publication Year: 1996, Page(s):519 - 521
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    Freely Available from IEEE
  • Combined two nonlinear image processings for speckle-free imaging with the optical array imaging system

    Publication Year: 1996, Page(s):29 - 32
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    In previous articles an optical array imaging system has been presented, where after collecting the array data the eigenvector with the largest eigenvalue is derived and it is computationally beamsteared to get images of the object. Images obtainable with this system have serious speckle noise. Two nonlinear processing methods are applied to reduce the speckle noise. One method is to average the i... View full abstract»

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  • Several practical client/server programming implementations for real-time transmission of image in X window environment

    Publication Year: 1996, Page(s):227 - 230
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (500 KB)

    Distributed multimedia technology has emerged in the last few years as a major research area. The real-time transmission of image (RTTI) on a distributed system is one of key techniques in the area. Several practical RTTI techniques in a distributed multiple servers network are proposed, which include XView, Xt and Widget, and Xlib programming implementations. Our design scheme has the following a... View full abstract»

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  • Variable time-frequency tiling using block transforms

    Publication Year: 1996, Page(s):25 - 28
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    It is well known that block transforms have fixed resolution in the time-frequency plane and lack flexibility in dealing with signals possessing a time-varying spectrum. We introduce new orthonormal transforms which are constructed from any block transform yet have variable time-frequency-localizability feature and fast computing capability. A framework is created for constructing time localizable... View full abstract»

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  • 2D shape analysis base on perceptual hierarchy

    Publication Year: 1996, Page(s):223 - 226
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (564 KB)

    A novel approach for the recognition of 2D shapes is presented based on the perceptual organization of descriptive-boundary primitives of objects. The system has three components: (1) a set of partition and grouping rules for extracting and manipulating the primitives, (2) a control structure of the processes and (3) a representation scheme based on a perceptual hierarchy View full abstract»

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  • Motion estimation and compensation for CIF/SIF video sequences

    Publication Year: 1996, Page(s):21 - 24
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    The non-uniform sampling theory states that any analogue signal whose spectrum is limited to 1/T can be exactly recovered from 2 sequences of samples taken at a rate 1/T and having a different sampling phase. This paper addresses the problem of motion estimation and compensation of CIF/SIF sequences when aliasing is still existing within the frames. This is the case when the method promoted by MPE... View full abstract»

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  • Efficient codebook design in vector quantization by parallel simulated annealing and evolutionary selection

    Publication Year: 1996, Page(s):219 - 222
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    Vector quantization is a technique that has been investigated and used in speech and image coding for data compression. A hybrid system of parallel simulated annealing and evolutionary selection (PSAES) is introduced to codebook design in vector quantization. It is examined for the vector space of low-order DCT coefficients and compared with local and near global optimization techniques. In additi... View full abstract»

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  • Minimization of color image entropy through colorimetric transformation

    Publication Year: 1996, Page(s):17 - 20
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    Image compression plays an important role in making digital images useful. Good compression systems must provide a trade-off between quality of representation for human beings and bit rate. We examine how entropy depends on choice of color space. We study entropy in both theoretical distributions of color image RGB values and distributions drawn from natural images. We determine which of several c... View full abstract»

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  • Performance analysis of direct sequence spread spectrum communications system employing interference excision

    Publication Year: 1996, Page(s):125 - 128
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    It is well known that a proper interference exciser enhances the performance of a spread spectrum communications system. There have been several competing excision techniques reported in the literature. This paper presents a performance evaluation of those excision techniques via the analytical and computer simulation tools. It is found that the analytical performance tools presented are in match ... View full abstract»

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  • Bilinear noise cancellation

    Publication Year: 1996, Page(s):366 - 369
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    We address the problem of noise cancellation with bilinear filters. These filters have infinite memory and degree. It is shown how to modify the equation error bilinear filter to use it in the context of noise cancellation. This truncated filter has good properties of convergence but theoretically yield biased results. These results are compared with that of output error bilinear filters (which ar... View full abstract»

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  • A distortion analysis of image VQ-based coding using a finite mixture distribution model

    Publication Year: 1996, Page(s):267 - 270
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    Traditional coding schemes break an image into blocks prior to coding. It is possible to classify current algorithms according to the block construction. Either the block size is kept constant, or the block size is image dependent. Since most natural images can be divided into regions of high and low detail, variable block-size coding techniques exploit more efficiently the structure of the data. ... View full abstract»

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  • Noniterative reconstruction of band limited signals and coding techniques

    Publication Year: 1996, Page(s):149 - 152
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    In this paper we propose linear iterative and noniterative algorithms which can efficiently correct a subset of t samples of a signal, whose values might have been corrupted, possibly due to noise, clipping, or any other reasons. We discuss the applicability of techniques used in error correcting codes to this problem, and the possibility of determining the location of the erroneous samples in ove... View full abstract»

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  • A new approach to piecewise linear modeling of time series

    Publication Year: 1996, Page(s):502 - 505
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    Due to the inherent non-linearity and non-stationarity of a wide class of time series, nonlinear models have been the object of an increasing interest over the past years. Piecewise linear models, in which a linear sub-model is associated with each region of a state-space decomposition, have been proposed as an attractive alternative to threshold autoregressive models. However, it is still unclear... View full abstract»

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  • Shape characterization by using the Gabor transform

    Publication Year: 1996, Page(s):215 - 218
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    This paper introduces a novel framework for 2D shape analysis from its outline by using the Gabor transform (GT). The shape's boundary is represented by a complex signal, which is analyzed by the GT. Three automatic methods for analyzing the GT representation are discussed. Experimental results have shown that the GT can be used in the identification of dominant points as well as contour regions p... View full abstract»

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  • Teaching wavelets with Java on the information superhighway

    Publication Year: 1996, Page(s):101 - 104
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (892 KB)

    One of the most exciting new developments on the information superhighway is the Java language of the Sun Microsystem. Java is portable, powerful, and network-aware. This paper presents some ideas and experiments on teaching wavelets and signal processing using Java View full abstract»

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  • Image restoration using a conjugate gradient based adaptive filtering algorithm

    Publication Year: 1996, Page(s):247 - 250
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    A new two-dimensional (2-D) recursive conjugate gradient (RCG) algorithm is developed for adaptive filtering. This algorithm is based on the conjugate gradient method of optimization and therefore has a fast convergence characteristic. The RCG is computationally simpler than the recursive least square (RLS) algorithm. The RCG algorithm with the equation-error and output-error methods is investigat... View full abstract»

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  • Spectral extrapolation in sub-band coding

    Publication Year: 1996, Page(s):13 - 16
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    We examine how feasible it is to extrapolate high-pass terms from the low-pass sub-image obtained by sub-band decomposition. Only very simple techniques like morphological filtering and contours extraction have been considered at this first stage, attempting to synthesize from the low-pass sub-image the attenuated transitions. The results point out that there is room for further investigation and ... View full abstract»

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  • A delayed error least mean squares adaptive filtering algorithm and its performance analysis

    Publication Year: 1996, Page(s):386 - 389
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    High sampling rate realizations of the least mean squares (LMS) adaptive filtering algorithm require that the inherent recursive computational bottleneck in the impulse response updating be broken by introducing algorithmic delays into the error feedback path. The well known delayed LMS (DLMS) technique achieves this by convolving delayed error samples with delayed input samples. This paper propos... View full abstract»

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  • An OFDM spread spectrum system using lapped transforms and partial band interference suppression

    Publication Year: 1996, Page(s):121 - 124
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    A system that uses orthogonal frequency division multiplexing (OFDM) as a spread spectrum modulation is introduced and its performance is evaluated in the presence of tone interference. Interference excision, in which some of the transform bins are removed in the detection process, is used in the receiver. The BER performance obtained using a number of block transforms is compared to that obtained... View full abstract»

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  • Step-like weighting windows for DSP in spectral analysis and antenna arrays

    Publication Year: 1996, Page(s):362 - 365
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    Step-like weighting windows are proposed for various applications in digital signal processing. Their parameters are optimized to minimize either the maximal sidelobe level of the corresponding frequency response (equidistant array pattern) or the ratio of the energies concentrated in the sidelobes and in the mainlobe. These parameters together with the mainlobe width are compared to the correspon... View full abstract»

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  • Properties of optimal, compaction filters in subband coding

    Publication Year: 1996, Page(s):89 - 92
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    Optimum compaction filters find application in the design of orthonormal subband coders with maximum coding gain. The compaction gain for a process is defined, and a number of its properties studied. Bounds on the compaction gain are established, and the conditions for the attainment of these bounds are specified in terms of the input power spectrum. Finally, the behavior of the optimum compaction... View full abstract»

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