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[Proceedings] ICASSP 91: 1991 International Conference on Acoustics, Speech, and Signal Processing

14-17 April 1991

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Displaying Results 1 - 25 of 933
  • ICASSP 91. 1991 International Conference on Acoustics, Speech and Signal Processing (Cat. No.91CH2977-7)

    Publication Year: 1991
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    Freely Available from IEEE
  • A residual-based selective window for robust recursive least squares estimation

    Publication Year: 1991, Page(s):1009 - 1012 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    An algorithm performing recursive least squares (RLS) estimation is proposed. It is based on selectively rejecting outliers arising from noise spikes; therefore, this method can avoid the bias of parameters estimation due to some large noise perturbations. Unlike a sliding fixed-window scheme, this windowing scheme can be noncontinuous. It depends on the estimated level of observed errors (residua... View full abstract»

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  • Computer-aided design of high-speed lattice wave digital filter integrated circuits

    Publication Year: 1991, Page(s):1229 - 1232 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (314 KB)

    A silicon compiler for generating IIR filter integrated circuits based on the lattice wave digital filter structure is presented. A novel architecture has been developed to minimize the chip area while achieving a high throughput. A fifth-order filter synthesized with the compiler measures 4.17 mm/sup 2/ and has an estimated sample rate of at least 60 MHz in 0.8 mu m BiCMOS gate-array technology. ... View full abstract»

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  • Fast algorithms for the continuous wavelet transform

    Publication Year: 1991, Page(s):2213 - 2216 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (521 KB)

    It is shown that filter banks arise naturally when implementing the continuous wavelet transform (CWT). The conditions under which the CWT can be computed exactly using discrete filter banks are determined, and fast CWT algorithms are derived. The complexity of the resulting algorithms increases linearly with the number of octaves. They are easily implemented by repetitive application of identical... View full abstract»

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  • A numerical and symbolic fusion method for interpretation of image sequence

    Publication Year: 1991, Page(s):2477 - 2480 vol.4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (455 KB)

    The problem of analyzing a sequence of images by taking into account the symbolic and numerical content of the signal is considered. An algorithm for segmentation and tracking of regions among images of a sequence is presented. The method is based on a Gibbs Markov random field (GMRF) model which couples the image process to a spatial-temporal region process. Optical flow field is used to adaptive... View full abstract»

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  • Model based estimation of left ventricle motion

    Publication Year: 1991, Page(s):2481 - 2484 vol.4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (629 KB)

    A model based estimation algorithm is presented for the analysis of left ventricle motion and deformation over a cardiac cycle. This model based approach allows the authors to decouple a nonlinear and complex estimation problem into simple and well structured sub-problems. They identify the global motion as the relative position and orientation change of the left ventricle as a whole and model its... View full abstract»

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  • From Sigma - Delta modulation to digital halftoning of images

    Publication Year: 1991, Page(s):2805 - 2808 vol.4
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    The author present his halftoning technique as an analytical 2-D extension of Sigma - Delta modulation, which is proven to feature optimal characteristics for the halftoning problem. A particular effort is devoted to transforming the sequential expression of Sigma - Delta modulation into a parallel and dimension-independent expression. This allows a precise understanding of the halftoning action i... View full abstract»

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  • Hierarchical coding of super high definition images with subband+multistage VQ

    Publication Year: 1991, Page(s):2637 - 2640 vol.4
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (700 KB)

    A subband based hierarchical coding algorithm is proposed and an examination is made of its coding performance for super high definition images. Several quadrature mirror filters are examined from the viewpoints of reconstruction accuracy, coding gain, and low pass characteristics. The two-stage vector quantization scheme is also introduced to control quantization accuracy in each subband. Hierarc... View full abstract»

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  • Efficient multiresolution signal coding via a signal-adapted perfect reconstruction filter pyramid

    Publication Year: 1991, Page(s):2633 - 2636 vol.4
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    Consideration is given to the problem of designing a signal-adapted two-band filtering system that has the perfect reconstruction property for application to multiresolution signal coding. A natural optimization criterion for this problem is introduced, and an iterative algorithm for computing optimal filters in lattice form is described. Some simulation results for the application of the techniqu... View full abstract»

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  • Bistatic ocean surface reverberation simulation

    Publication Year: 1991, Page(s):1453 - 1456 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (468 KB)

    Bistatic ocean surface reverberation is simulated using the bistatic framework (transmitter and receiver not collocated) of the generic sonar model (GSM) modified to incorporate the frequency spreading effects of transmitter, receiver, and scatterer motion and produce time-varying reverberation spectra. A computationally straightforward algorithm has been developed for computing high-frequency bis... View full abstract»

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  • Priority DCT coding for image sequences

    Publication Year: 1991, Page(s):2629 - 2632 vol.4
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    A new DCT (discrete cosine transform) based coding method for image sequences is presented. This technique utilizes the between frame difference of the DCT coefficients which are coded and transmitted progressively according to their magnitude (large values first). This is achieved without any overhead for the position information of the ordered samples using priority progressive coding (PPC). PPC... View full abstract»

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  • On the convergence of the minimum variance spectral estimator in nonstationary noise

    Publication Year: 1991, Page(s):3141 - 3143 vol.5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (168 KB)

    A simple proof of the convergence of the minimum variance (MV) spectral estimator to the point spectrum, as the order of the covariance matrix goes to infinity, is presented. This is done in the multichannel setting where the corrupting unknown noise process is allowed to be nonstationary. Also obtained are explicit bounds on the rate of convergence. The results suggest that the MV(n) spectrum is ... View full abstract»

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  • Robust HMM phoneme modeling for different speaking styles

    Publication Year: 1991, Page(s):265 - 268 vol. 1
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    The authors describe the robustness of six types of phoneme-based HMMs (hidden Markov models) against speaking-style variations. The six types of models are VQ (vector quantization)-based and fuzzy VQ-based discrete HMMs, and single-Gaussian and mixture-Gaussian HMMs with either diagonal or full covariance matrices. The mixture-Gaussian HMM with diagonal covariance matrices, the fuzzy VQ-based dis... View full abstract»

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  • Estimation of the parameters of a multipath channel using set-theoretic deconvolution

    Publication Year: 1991, Page(s):1449 - 1452 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    A method for the estimation of the parameters of specular multipath communication channels is presented. The method takes advantage of the matched filtering, set-theoretic deconvolution and autoregressive modeling. Pulse compression waveforms such as chip and frequency-hop coding waveforms are used as channel problem signals. The proposed method, applied to a number of multipath channel models wit... View full abstract»

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  • Transform coding of color images with limited palette size

    Publication Year: 1991, Page(s):2625 - 2628 vol.4
    Cited by:  Papers (4)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    An approach for the compression of color images with limited palette size that does not require color quantization of the decoded image is presented. The technique restricts the pixels of the decoded image to take values only in the original palette. Thus, the decoded image can be readily displayed without having to be quantized. Results obtained with a typical image are included to compare a conv... View full abstract»

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  • A multirate filter bank based approach to the detection and enhancement of linear features in images

    Publication Year: 1991, Page(s):2557 - 2560 vol.4
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    A general method based on the directional filter bank for the detection and enhancement of linear features in multidimensional data is presented. Results demonstrating the effectiveness of this new method are presented for two trial cases: the enhancement of cell boundaries in biomedical images, and the analysis and enhancement of fingerprints View full abstract»

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  • Error spectrum shaping quantizers with non-ideal reconstruction filters and saturating quantizers

    Publication Year: 1991, Page(s):1905 - 1908 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    It is pointed out that previous analyses of ESS (error spectrum shaping) quantizers did not consider either the limitations of realizable reconstruction filters or the effects of quantizer saturation. Consequently, predictions of ESS distortion were often optimistic. The authors extend the original analysis to include the use of nonideal reconstruction filters. Simulations show that this extended ... View full abstract»

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  • Spectral analysis based on the canonical autoregressive decomposition

    Publication Year: 1991, Page(s):3137 - 3140 vol.5
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    Time series modeling as the sum of an autoregressive (AR) process and sinusoids is proposed. When the AR model order is infinite, it is called the canonical autoregressive decomposition and is equivalent to the Wold decomposition. Maximum likelihood estimation of the sinusoidal and AR parameters is shown to require minimization with respect to only the unknown frequencies. Although the estimation ... View full abstract»

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  • A robust hierarchical probabilistic framework for visual target tracking

    Publication Year: 1991, Page(s):2457 - 2460 vol.4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (836 KB)

    A robust and efficient technique for detection of region boundaries in a sequence of images is the foundation for a hierarchical framework for visual target tracking. This robust technique is a multi-hypothesis test that searches for a boundary that maximizes a certain performance criterion. The framework also consists of a technique to restore noisy images when the parameters are not known and al... View full abstract»

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  • Adaptive FIR-filter for control systems with periodic disturbance

    Publication Year: 1991, Page(s):3241 - 3244 vol.5
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (168 KB)

    An adaptive finite impulse response (FIR) algorithm for adjusting the coefficients of an adaptive filter for suppressing periodic disturbances is presented. Due to the fact that the poles of the filter are spaced equidistantly, superior convergence properties and attenuations are obtained. The effectiveness of the adaptive filter is compared with the performance of known algorithms. The algorithm ... View full abstract»

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  • Using the topology-preserving properties of SOFMs in speech recognition

    Publication Year: 1991, Page(s):261 - 264 vol. 1
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    Self-organizing feature maps (SOFMs) are used as speech feature extractors followed by a classifier based on multilayer feedforward networks. Usually SOFMs have been used in speech recognition as static pattern classifiers or vector quantizers, ignoring their property of preserving the local topology of input pattern space. Here, the topological ordering of the acoustic speech data in the SOFM is ... View full abstract»

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  • The square-root Schur RLS adaptive filter

    Publication Year: 1991, Page(s):1845 - 1848 vol.3
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    A square-root normalized Schur (1917,1986) RLS (recursive least squares) adaptive filter is presented which belongs to the newly developed class of Schur-type algorithms for adaptive filtering and parameter estimation in the serialized data case of RLS processing. Schur-type algorithms can outperform many of the well-known fast adaptive filtering algorithms due to their inherent ability to work wi... View full abstract»

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  • Optimal quantizer step sizes for transform coders

    Publication Year: 1991, Page(s):2621 - 2624 vol.4
    Cited by:  Papers (24)  |  Patents (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    As evidenced by the theoretical modeling and simulation presented, the optimal quantizer solution for run-length and Huffman coding is quite addressable for the Laplacian case. The step sizes may be calculated in advance for images that share common statistics. Furthermore, the model can also be used for other uses such as bit-management for rate control and lower bound estimation for compressed f... View full abstract»

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  • Edge detection using recursive biorthogonal wavelet transform

    Publication Year: 1991, Page(s):2553 - 2556 vol.4
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    A new method of multiresolution edge detection is described. This method is based on a recursive biorthogonal wavelet transform which relates the digital filter to a continuous analysis function, the so-called wavelet. In biorthogonal wavelet analysis, there is a high-pass filter corresponding to the wavelet and a low-pass filter corresponding to the scaling function. The new idea is to compute op... View full abstract»

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  • Image coding using lattice vector quantization of wavelet coefficients

    Publication Year: 1991, Page(s):2273 - 2276 vol.4
    Cited by:  Papers (33)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    An image coding scheme has been introduced by the authors (see IEEE ICASSP, p.2297, 1990). This scheme involves two steps. A biorthogonal wavelet transform is applied to the original image, and wavelet coefficients are then vector quantized using the LBG (Linde, Buzo and Gray, 1980) method. The purpose of this work is to propose a new scheme for vector quantization of wavelet coefficients. The pro... View full abstract»

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