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Signal Processing and Its Applications, 2003. Proceedings. Seventh International Symposium on

Date 1-4 July 2003

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Displaying Results 1 - 25 of 166
  • Non-Gaussian interference characterisation with application to current radio astronomy technique

    Publication Year: 2003 , Page(s): 355 - 358 vol.2
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (310 KB) |  | HTML iconHTML  

    Studies into the effects of coarse quantisation on the correlation function of astronomical signals have typically assumed that the undesirable part of the signal will be white noise with a Gaussian distribution. Due to the advent of the modern communications era, interference from man-made satellites has made it necessary to reinvestigate these effects using interference distributions which are n... View full abstract»

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  • Clipping error resilience for peak power-constrained DMT transmission via implicit frequency domain redundancy

    Publication Year: 2003 , Page(s): 379 - 382 vol.2
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (360 KB) |  | HTML iconHTML  

    In this paper we present a new error correction approach for a simple peak-to-average power ratio (PAR) reduction scheme for discrete multi-tone (DMT) systems based on coefficient clipping. The proposed method utilizes existing or intentionally placed redundancy in the frequency domain in the form of unused subcarriers. Compared to existing PAR reduction algorithms, all signal processing is perfor... View full abstract»

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  • Optimizing binary decision systems by manipulating transmission intervals

    Publication Year: 2003 , Page(s): 339 - 342 vol.2
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (301 KB) |  | HTML iconHTML  

    We study the optimization of a binary decision system where quantized (soft) decisions are transmitted across an additive white Gaussian noise channel. We adjust the bit transmission intervals to maximize the Chemoff distance at the output of the channel. At low channel signal-to-noise ratios (when the probability of a bit error is higher), we find unequal transmission intervals yield significant ... View full abstract»

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  • Design of double density wavelet filter banks

    Publication Year: 2003 , Page(s): 463 - 466 vol.2
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (259 KB) |  | HTML iconHTML  

    We look at the design of oversampled filter banks and the resulting framelets. The framelets we design can improve shift invariant properties over decimated wavelet transform. Shift invariance has applications in many areas particularly denoising and coding and compression. Our contribution here is on filter bank completion. We develop factorization methods to find wavelet filters from given scali... View full abstract»

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  • Convergence and steady-state analysis of a variable step-size normalized LMS algorithm

    Publication Year: 2003 , Page(s): 591 - 594 vol.2
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (298 KB) |  | HTML iconHTML  

    This paper presents a simple and robust variable step-size normalized LMS (VSS-NLAIS) adaptive algorithm. The fixed step-size NLMS algorithm (FSS- NLMS) usually results in a trade-off between the residual error and the convergence speed of the algorithm. The variable step-size NLMS algorithm presented here relaxes such trade-off. Both analysis and simulation results show that the proposed VSS-NLMS... View full abstract»

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  • Synchronization in OFDM powerline communication systems in presence of narrowband interferences

    Publication Year: 2003 , Page(s): 359 - 362 vol.2
    Cited by:  Papers (2)  |  Patents (7)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (364 KB) |  | HTML iconHTML  

    Residential power lines provide a low-cost alternative for the establishment of broadband home networks to wireless or twisted-pair phone-line channels. In addition to being subjected to a variety of noise and distortion sources, the received signal in a power line communication system is also affected by narrowband interferences, primarily from amateur and short wave radios. Though the effect of ... View full abstract»

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  • Effect of the window length on the EMG spectral estimation through the Blackman-Tukey method

    Publication Year: 2003 , Page(s): 17 - 20 vol.2
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (298 KB) |  | HTML iconHTML  

    This paper presents the application of spectral analysis methods that are based on the FFT algorithm to the study of the surface EMG power spectrum compression. Some preferred characteristic frequencies used to monitor the spectral compression are the mean and median frequencies. In this work, we show that the spectral density estimation by the Blackman-Tukey method associated with the weighting w... View full abstract»

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  • Multi-rate and multi-resolution scalable to lossless audio compression using PSPIHT

    Publication Year: 2003 , Page(s): 121 - 124 vol.2
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (372 KB) |  | HTML iconHTML  

    This paper presents a scalable to lossless compression scheme that allows scalability in terms of sampling rate as well as quantization resolution. The scheme presented is perceptually scalable and it also allows lossless compression. The scheme produces smooth objective scalability, in terms of SNR, until lossless compression is achieved. The scheme is built around the perceptual SPIHT algorithm,... View full abstract»

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  • Design of symmetric bi-orthogonal double density wavelet filter banks

    Publication Year: 2003 , Page(s): 467 - 470 vol.2
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (246 KB) |  | HTML iconHTML  

    We look at the design of a class of oversampled filter banks and the resulting framelets. The oversampled property is achieved via an extra subband resulting in double density filter banks (DDFB's). We design a class of such filters with linear phase property. We look at a special class of framelets from a filter bank perspective, in that we design double density filter banks (DDFB's). We define t... View full abstract»

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  • Resonator Fourier transform

    Publication Year: 2003 , Page(s): 471 - 474 vol.2
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (365 KB) |  | HTML iconHTML  

    This paper proposes a new discrete Fourier transform algorithm using resonator H(z) = 1/(1 + z-2 ). We call this algorithm the resonator Fourier transform (RFT). In the RFT, to calculate Fourier coefficients ak and bk of a frequency component fk, we sample an input signal x(t) by a sampling frequency fs = 4fk and accumulate the samp... View full abstract»

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  • Detecting eyes in digital images

    Publication Year: 2003 , Page(s): 21 - 24 vol.2
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (464 KB) |  | HTML iconHTML  

    Detecting eyes in digital images taken in a variety of natural lighting conditions is not a straightforward task. Great difficulties are experienced when one attempts to employ traditional methods such as the Radon or Hough transforms. They appear to be not robust enough to perform the detection task in images that include blur, speckles, or a reflection in the pupil or iris areas. Also, in some p... View full abstract»

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  • Noise reduction by multiplicative waveforms decomposition

    Publication Year: 2003 , Page(s): 161 - 164 vol.2
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (352 KB) |  | HTML iconHTML  

    This paper introduces a novel multiplicative noise reduction method based on a particular association of structural and statistical analysis. The structural analysis is performed by a new, multiplicative matching pursuit decomposition (MMPD), that decomposes images containing the intrinsic variation into a nonlinear expansion of waveforms selected from a dictionary of functions. This selection is ... View full abstract»

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  • Robust speech music discrimination using spectrum's first order statistics and neural networks

    Publication Year: 2003 , Page(s): 125 - 128 vol.2
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (369 KB) |  | HTML iconHTML  

    Most of speech/music discrimination techniques proposed in the literature need a great amount of training data in order to provide acceptable results. Besides, they are usually context-dependent. In this paper, we propose a novel technique for speech/music discrimination which relies on first order sound spectrum's statistics as feature vector and a neural network for classification. Experiments d... View full abstract»

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  • Analysis of chromosome genomic signals

    Publication Year: 2003 , Page(s): 49 - 52 vol.2
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (333 KB) |  | HTML iconHTML  

    The paper gives results in the analysis of genomic signals at the scale of whole chromosomes. For illustration purposes, eukaryote chromosomes are presented, but the same methods have been applied for the analysis of prokaryote chromosomes. Phase analysis, 2D (complex) and 3D (vector) sequence path analysis, and statistical analysis are presented. Based on the comparative behaviour of the cumulate... View full abstract»

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  • Warped ARMA filters in high quality audio coding

    Publication Year: 2003 , Page(s): 153 - 156 vol.2
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (369 KB) |  | HTML iconHTML  

    In this paper, a novel audio coder using the discrete wavelet transform (DWT) and a warped linear prediction (WLP) model, is proposed. In contrast to conventional LP, WLP allows for the control of frequency resolution to closely match the response of the human auditory system. The residual from the inverse WLP filtering is analyzed by a wavelet filterbank designed to approximate the critical bands... View full abstract»

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  • Genetic algorithms and multifractal segmentation of cervical cell images

    Publication Year: 2003 , Page(s): 1 - 4 vol.2
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (368 KB) |  | HTML iconHTML  

    This paper deals with the segmentation problem of cervical cell images. Knowing that the malignity criteria appear on the morphology of the core and the cytoplasm of each cell, then, the goal of this segmentation is to separate each cell on its component, that permits to analyze separately their morphology (size and shape) in the recognition step, for deducing decision about the malignity of each ... View full abstract»

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  • Exploiting independence for co-channel interference cancellation and symbol detection in multiuser digital communications

    Publication Year: 2003 , Page(s): 303 - 306 vol.2
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (377 KB) |  | HTML iconHTML  

    In the blind equalization of multi-input multi-output (MIMO) finite impulse response communication channels, co-channel interference (CCI) is typically cancelled by exploiting the properties of digital modulations, such as their finite alphabet (FA). This contribution takes advantage of the mutual independence of the users' signals through the application of independent component analysis (ICA). W... View full abstract»

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  • A wavelet filter criterion for an a-priori evaluation of wavelet coding and denoising performances

    Publication Year: 2003 , Page(s): 475 - 478 vol.2
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (344 KB) |  | HTML iconHTML  

    Wavelet transforms are used in number of important signal and image processing tasks including image coding. The choice of the filter bank is very important and is directly linked to the efficiency of the compression. An objective criterion to guide the choice of the wavelet filters is pro- posed. It is composed of two indexes. The first one is a frequency index computed from the aliasing of the f... View full abstract»

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  • A quadratic classifier based on multispectral texture features for prostate cancer diagnosis

    Publication Year: 2003 , Page(s): 37 - 40 vol.2
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (364 KB) |  | HTML iconHTML  

    This paper is concerned with the development of an automatic classification system for use in prostate cancer diagnosis. The system aims to detect and classify nuclei textures captured from microscopic samples taken from needle biopsies. The main contribution here is that the analysis is carried out over thirty-three spectral bands instead of using the conventional grey scale or RGB colour spaces.... View full abstract»

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  • Evolutionary design of filter bank based on quaternions

    Publication Year: 2003 , Page(s): 275 - 278 vol.2
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (362 KB) |  | HTML iconHTML  

    This paper presents novel approach to the design of 4-channel filter bank composed of hypercomplex all-pass filters - a generalization of well known IIR all-passes to quaternion number system. This is uncommon alternative way of doing subband decomposition, but the design of such a system is difficult. Genetic algorithm was adopted to solve this hard numerical optimization task. The problem statem... View full abstract»

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  • Alignment of 3-D medical data sets based on an efficient optimizer and fast voxel recomputation

    Publication Year: 2003 , Page(s): 25 - 28 vol.2
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (353 KB) |  | HTML iconHTML  

    An efficient volume registration based on global information content is described. In a nutshell this task represents an optimization problem that is solved with respect to robustness and computational speed especially. Strong attention is paid to the choice of a function that measures the quality of the registration (mutual information) and to the choice of an optimization strategy that searches ... View full abstract»

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  • Photometric aspects: a new approach for 3D free form object recognition using a single luminance image

    Publication Year: 2003 , Page(s): 423 - 426 vol.2
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (367 KB) |  | HTML iconHTML  

    3D free form object recognition is one of the most difficult problems in computer vision. In this paper we present a new approach, which exploit only one luminance image of a complex object to recognize it in the scene by identifying its appearance in the input image. For that, we construct a photometric (non geometric) projective invariant to perform matching between local regions of the object i... View full abstract»

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  • Hardware efficient FIR filter implementation using subfilters for digital receivers

    Publication Year: 2003 , Page(s): 263 - 266 vol.2
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (359 KB) |  | HTML iconHTML  

    Digital filters employed in the intermediate frequency (IF) block of wide-band receivers present a hardware design challenge. The computational complexity of fixed-point filters is dominated by the number of adders used in the implementation of the multipliers. It has been shown that using common subexpression elimination to exploit redundancy across the canonic signed digit (CSD) coefficients res... View full abstract»

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  • Image noises removal on alpha-stable via Bayesian estimator

    Publication Year: 2003 , Page(s): 165 - 168 vol.2
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (391 KB) |  | HTML iconHTML  

    A maximum likelihood Bayesian estimator that recovers the signal component of the wavelet coefficients from original images by using an α-stable signal prior distribution is discussed. As we discussed in our earlier paper that the Bayesian estimator can approximate impulsive noise more accurately than other models and that the general case of the Bayesian processor does not have a closed-for... View full abstract»

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  • Analysis of quantization watermarking in the wavelet transform domain

    Publication Year: 2003 , Page(s): 375 - 378 vol.2
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (316 KB) |  | HTML iconHTML  

    Quantization watermarking is a method of embedding hidden copyright information based on dithered quantization. Such a scheme is only practical for watermarking applications, where the original signal is available to the detector as for a fingerprinting purpose. The aim of this paper is to analyze the quantization watermarking in the wavelet transform or equivalently in filter bank domain. We invo... View full abstract»

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