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IEEE Signal Processing Letters

Issue 4 • Date April 2006

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Displaying Results 1 - 23 of 23
  • Table of contents

    Publication Year: 2006, Page(s):c1 - c4
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  • IEEE Signal Processing Letters publication information

    Publication Year: 2006, Page(s): c2
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  • Multiple H^\infty Filter-Based Deterministic Sequence Estimation in Non-Gaussian Channels

    Publication Year: 2006, Page(s):185 - 188
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB) | HTML iconHTML

    A novel and more robust implementation is proposed for sequence estimation in uncertain environments with additive non-Gaussian ambient noise and intersymbol interference. This is based on a deterministic performance index that minimizes the effect of worst-case disturbances on the estimation error. The decoder has multiple H^\infty filters and is in the fash... View full abstract»

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  • A filter coefficient quantization method with genetic algorithm, including simulated annealing

    Publication Year: 2006, Page(s):189 - 192
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB) | HTML iconHTML

    A method based on a genetic algorithm (GA), including a simulated annealing (SA), is proposed for filter coefficient quantization. The proposed method uses the GA to search a population of the quantized filters of a digital filter for the optimal quantized filter. It retains the most accurate frequency characteristic of the original filter, which is either finite impulse response filter or an infi... View full abstract»

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  • An efficient algorithm for bandpass sampling of multiple RF signals

    Publication Year: 2006, Page(s):193 - 196
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB) | HTML iconHTML

    This letter proposes, based on a bandpass sampling theory, a novel method to find available sampling ranges with a low computational complexity and high accuracy for multiple bandpass radio frequency signals. Guard-bands between downconverted signal spectrums are also taken into consideration in determining a minimum sampling frequency. We verify its validity through simulations in terms of the sa... View full abstract»

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  • High-resolution image reconstruction from multiple differently exposed images

    Publication Year: 2006, Page(s):197 - 200
    Cited by:  Papers (18)  |  Patents (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1024 KB) | HTML iconHTML

    Super-resolution reconstruction is the process of reconstructing a high-resolution image from multiple low-resolution images. Most super-resolution reconstruction methods assume that exposure time is fixed for all observations, which is not necessarily true. In reality, cameras have limited dynamic range and nonlinear response to the quantity of light received, and exposure time might be adjusted ... View full abstract»

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  • Joint source-channel coding with partially coded index assignment for robust scalable video

    Publication Year: 2006, Page(s):201 - 204
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (168 KB) | HTML iconHTML

    A scalable video coder consisting of motion-compensated temporal filtering coupled with structured vector quantization plus a linear mapping of quantizer indexes that minimizes simultaneously source and channel distortions is presented. The linear index assignment takes the form of either a direct, uncoded mapping or a coded mapping via Reed-Muller codes. Experimental results compare the proposed ... View full abstract»

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  • Novel quantized DCT for video encoder optimization

    Publication Year: 2006, Page(s):205 - 208
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB) | HTML iconHTML

    A novel technique is proposed to reduce the computational complexity of discrete cosine transform (DCT)-based video encoders. The proposed method merges the DCT and quantization into a single procedure, which is referred to as the novel quantized DCT (NQDCT), such that the DCT output does not need to be explicitly quantized. Thus, a lot of computations related to quantization can be saved. The vid... View full abstract»

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  • Audio fingerprinting based on normalized spectral subband moments

    Publication Year: 2006, Page(s):209 - 212
    Cited by:  Papers (39)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB) | HTML iconHTML

    The performance of a fingerprinting system, which is often measured in terms of reliability and robustness, is directly related to the features that the system uses. In this letter, we present a new audio-fingerprinting method based on the normalized spectral subband moments. A threshold used to reliably determine a fingerprint match is obtained by modeling the features as a stationary process. Th... View full abstract»

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  • Security analysis of transformed-key asymmetric watermarking system

    Publication Year: 2006, Page(s):213 - 215
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (94 KB) | HTML iconHTML

    Asymmetric watermarking schemes have been widely discussed recently. Transformed-key asymmetric watermarking (TKAW) system is one of the schemes, which was proposed by Choi et al. This letter discusses the weaknesses of TKAW. In TKAW, the inner product of the received signal and public key almost equals to zero. As a result, it cannot resist projection attack. To prove this point, we will demonstr... View full abstract»

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  • Image feature-based space-time processing for ground moving target detection

    Publication Year: 2006, Page(s):216 - 219
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (896 KB) | HTML iconHTML

    An image feature-based space time processing (IFSTP) algorithm is introduced to effectively detect ground moving targets in clutter and jamming via airborne radar. This new approach exploits the distinct image features of targets and interference signals in the angle-Doppler domain. An image segmentation algorithm, referred to as region growing, extracts targets and interference features in the an... View full abstract»

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  • Active differential CMOS imaging device for human face recognition

    Publication Year: 2006, Page(s):220 - 223
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB) | HTML iconHTML

    This letter describes an original CMOS imaging system dedicated to human face recognition. The main interest of this work is to provide ambient light invariant images and facilitate segmentation of the face from the background. This system has been implemented in a specially designed CMOS smart image sensor with only one analog memory per pixel. This simple pixel design gives the possibility to in... View full abstract»

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  • Adaptive filtering algorithms designed using control Liapunov functions

    Publication Year: 2006, Page(s):224 - 227
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB) | HTML iconHTML

    The standard conjugate gradient (CG) method uses orthogonality of the residues to simplify the formulas for the parameters necessary for convergence. In adaptive filtering, the sample-by-sample update of the correlation matrix and the cross-correlation vector causes a loss of the residue orthogonality in a modified online algorithm, which, in turn, results in loss of convergence and an increase of... View full abstract»

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  • Time-domain fast fixed-point algorithms for convolutive ICA

    Publication Year: 2006, Page(s):228 - 231
    Cited by:  Papers (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB) | HTML iconHTML

    This letter presents new blind separation methods for moving average (MA) convolutive mixtures of independent MA processes. They consist of time-domain extensions of the FastICA algorithms developed by Hyvarinen and Oja for instantaneous mixtures. They perform a convolutive sphering in order to use parameter-free fast fixed-point algorithms associated with kurtotic or negentropic non-Gaussianity c... View full abstract»

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  • Wavelet deconvolution in a periodic setting using cross-validation

    Publication Year: 2006, Page(s):232 - 235
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB) | HTML iconHTML

    The wavelet deconvolution method WaveD using band-limited wavelets offers both theoretical and computational advantages over traditional compactly supported wavelets. The translation-invariant WaveD with a fast algorithm improves further. The twofold cross-validation method for choosing the threshold parameter and the finest resolution level in WaveD is introduced. The algorithm's performance is c... View full abstract»

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  • Prediction of inverse covariance matrix (PICM) sequences for STAP

    Publication Year: 2006, Page(s):236 - 239
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB) | HTML iconHTML

    In this letter, we study issues associated with applying least-squares estimation to predict the inverse covariance matrix in bistatic airborne radar systems. For the bistatic ground moving target indication radar, the clutter Doppler frequency depends on the range for all array geometries. This range dependency leads to problems in clutter suppression through space-time adaptive processing (STAP)... View full abstract»

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  • CFAR detection of extended and multiple point-like targets without assignment of secondary data

    Publication Year: 2006, Page(s):240 - 243
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB) | HTML iconHTML

    We design and assess adaptive schemes to detect extended and multiple point-like targets embedded in correlated Gaussian noise. Proposed algorithms rely on either the generalized likelihood ratio test (GLRT) or ad hoc procedures. Such detectors make it possible to get rid of distinct secondary data and guarantee the constant false alarm rate (CFAR) property with respect to the covariance matrix of... View full abstract»

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  • Split-order linear prediction for segmentation and harmonic spectral modeling

    Publication Year: 2006, Page(s):244 - 247
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB) | HTML iconHTML

    Linear prediction (LP) analysis, split in two stages, is proposed for a combined time-frequency analysis. The first-stage LP is used to obtain the residual signal and extract each one of its cycles, whose harmonic spectrum is then modeled by the second-stage estimate from discrete all-pole algorithms. Thus, harmonic cycle spectra are modeled with less than 1 dB in log spectral distortion (SD). Fur... View full abstract»

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  • IEEE Signal Processing Letters Information for authors

    Publication Year: 2006, Page(s):248 - 249
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  • Special issue on blind signal processing for speech and audio applications

    Publication Year: 2006, Page(s): 250
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  • Special issue on content storage and delivery in peer-to-peer network

    Publication Year: 2006, Page(s): 251
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  • Special issue on semantic image and video indexing in broad domains

    Publication Year: 2006, Page(s): 252
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  • IEEE Signal Processing Society Information

    Publication Year: 2006, Page(s): c3
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Aims & Scope

The IEEE Signal Processing Letters is a monthly, archival publication designed to provide rapid dissemination of original, cutting-edge ideas and timely, significant contributions in signal, image, speech, language and audio processing.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Peter Willett
University of Connecticut
Storrs, CT 06269
peter.willett@uconn.edu