Computationally efficient direction-of-arrival estimation based on partial a priori knowledge of signal sources
A computationally efficient method is proposed for estimating the directions-of-arrival (DOAs) of signals impinging on a uniform linear array (ULA), based on partial a priori knowledge of signal sources. Unlike the classical MUSIC algorithm, the ...
Texture-gradient-based contour detection
In this paper, a new biologically motivated method is proposed to effectively detect perceptually homogenous region boundaries. This method integrates the measure of spatial variations in texture with the intensity gradients. In the first stage, texture ...
The optimal design of weighted order statistics filters by using support vector machines
Support vector machines (SVMs), a classification algorithm for the machine learning community, have been shown to provide higher performance than traditional learning machines. In this paper, the technique of SVMs is introduced into the design of ...
Analysis and modeling of echolocation signals emitted by mediterranean bottlenose dolphins
We analyzed the echolocation sounds emitted by Mediterranean bottlenose dolphins. We extracted the click trains by visual inspection of the data files recorded along the coast of the Tuscany with the collaboration of the CETUS Research Center. We ...
Information theory for Gabor feature selection for face recognition
A discriminative and robust feature--kernel enhanced informative Gabor feature--is proposed in this paper for face recognition. Mutual information is applied to select a set of informative and nonredundant Gabor features, which are then further enhanced ...
Nonmyopic sensor scheduling and its efficient implementation for target tracking applications
We propose two nonmyopic sensor scheduling algorithms for target tracking applications. We consider a scenario where a bearing-only sensor is constrained to move in a finite number of directions to track a target in a two-dimensional plane. Both ...
A novel efficient cluster-based MLSE equalizer for satellite communication channels with M-QAM signaling
In satellites, nonlinear amplifiers used near saturation severely distort the transmitted signal and cause difficulties in its reception. Nevertheless, the nonlinearities introduced by memoryless bandpass amplifiers preserve the symmetries of the M-ary ...
An exact FFT recovery theory: a nonsubtractive dither quantization approach with applications
Fourier transform is undoubtedly one of the cornerstones of digital signal processing (DSP). The introduction of the now famous FFT algorithm has not only breathed a new lease of life into an otherwise latent classical DFT algorithm, but also led to an ...
An FIR notch filter for adaptive filtering of a sinusoid in correlated noise
A novel adaptive FIR filter for the estimation of a single-tone sinusoid corrupted by additive noise is described. The filter is based on an offline optimization procedure which, for a given notch frequency, computes the filter coefficients such that ...
On the channel capacity of multiantenna systems with Nakagami fading
We discuss the channel capacity of multiantenna systems with the Nakagami fading channel. Analytic expressions for the ergodic channel capacity or its lower bound are given for SISO, SIMO, and MISO cases. Formulae for the outage probability of the ...
From matched spatial filtering towards the fused statistical descriptive regularization method for enhanced radar imaging
We address a new approach to solve the ill-posed nonlinear inverse problem of high-resolution numerical reconstruction of the spatial spectrum pattern (SSP) of the backscattered wavefield sources distributed over the remotely sensed scene. An array or ...
High efficiency EBCOT with parallel coding architecture for JPEG2000
This work presents a parallel context-modeling coding architecture and a matching arithmetic coder (MQ-coder) for the embedded block coding (EBCOT) unit of the JPEG2000 encoder. Tier-1 of the EBCOT consumes most of the computation time in a JPEG2000 ...
2D four-channel perfect reconstruction filter bank realized with the 2D lattice filter structure
A novel orthogonal 2D lattice structure is incorporated into the design of a nonseparable 2D four-channel perfect reconstruction filter bank. The proposed filter bank is obtained by using the polyphase decomposition technique which requires the design ...
Performance analysis of the blind minimum output variance estimator for carrier frequency offset in OFDM systems
Carrier frequency offset. (CFO) is a serious drawback in orthogonal frequency division multiplexing (OFDM) systems. It must be estimated and compensated before demodulation to guarantee the system performance. In this paper, we examine the performance ...
Global motion model for stereovision-based motion analysis
An advantage of stereovision-based motion analysis is that the depth information is available, thus motion can be estimated more precisely in 2.5D stereo coordinate system (SCS) constructed by the depth and the image coordinates. In this paper, stereo ...
A secure watermarking scheme for buyer-seller identification and copyright protection
We propose a secure watermarking scheme that integrates watermarking with cryptography for addressing some important issues in copyright protection. We address three copyright protection issues--buyer-seller identification, copyright infringement, and ...
Efficient and secure fingerprint verification for embedded devices
This paper describes a secure and memory-efficient embedded fingerprint verification system. It shows how a fingerprint verification module originally developed to run on a workstation can be transformed and optimized in a systematic way to run real-...
Generalized sampling theorem for bandpass signals
The reconstruction of an unknown continuously defined function f(t) from the samples of the responses of m linear time-invariant (LTI) systems sampled by the 1/mth Nyquist rate is the aim of the generalized sampling. Papoulis (1977) provided an elegant ...
A human body analysis system
This paper describes a system for human body analysis (segmentation, tracking, face/hands localisation, posture recognition) from a single view that is fast and completely automatic. The system first extracts low-level data and uses part of the data for ...
A robust capon beamformer against uncertainty of nominal steering vector
A robust Capon beamformer (RCB) against the uncertainty of nominal array steering vector (ASV) is formulated in this paper. The RCB, which can be categorized as diagonal loading approach, is obtained by maximizing the output power of the standard Capon ...
Optimal design of noisy transmultiplexer systems
An optimal design method for noisy transmultiplexer systems is presented. For a transmultiplexer system with given transmitters and desired crosstalk attenuation, we address the problem of minimizing the reconstruction error while ensuring that the ...
Source depth estimation using a horizontal array by matched-mode processing in the frequency-wavenumber domain
In shallow water environments, matched-field processing (MFP) and matched-mode processing (MMP) are proven techniques for doing source localization. In these environments, the acoustic field propagates at long range as depth-dependent modes. Given a ...
Partial equalization of non-minimum-phase impulse responses
We propose a modified version of the standard homomorphic method to design a minimum-phase inverse filter for non-minimum-phase impulse responses equalization. In the proposed approach some of the dominant poles of the filter transfer function are ...
A robust formant extraction algorithm combining spectral peak picking and root polishing
We propose a robust formant extraction algorithm that combines the spectral peak picking, formants location examining for peak merger checking, and the root extraction methods. The spectral peak picking method is employed to locate the formant ...
Blind adaptive channel equalization with performance analysis
A new adaptive multiple-shift correlation (MSC)-based blind channel equalizer (BCE) for multiple FIR channels is proposed. The performance of the MSC-based BCE under channel order mismatches due to small head and tail channel coefficient is ...
Stereo image coder based on the MRF model for disparity compensation
This paper presents a stereoscopic image coder based on the MRF model and MAP estimation of the disparity field. The MRF model minimizes the noise of disparity compensation, because it takes into account the residual energy, smoothness constraints on ...
A posterior unionmodel with applications to robust speech and speaker recognition
This paper investigates speech and speaker recognition involving partial feature corruption, assuming unknown, time-varying noise characteristics. The probabilistic union model is extended from a conditional-probability formulation to a posterior-...
Fast registration of remotely sensed images for earthquake damage estimation
Analysis of the multispectral remotely sensed images of the areas destroyed by an earthquake is proved to be a helpful tool for destruction assessments. The performance of such methods is highly dependant on the preprocess that registers the two shots ...
Erratum to "a new class of particle filters for random dynamic systems with unknown statistics"
We have found an error in the proof of Lemma 1 presented in our paper "A New Class of Particle Filters for Random Dynamic Systems with Unknown Statistics" (EURASIP Journal on Applied Signal Processing, 2004). In the sequel, we provide a restatement of ...