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检索条件"任意字段=Advanced Signal Processing: Algorithms, Architectures, and Implementations V"

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High-resolution iris image reconstruction from low-resolution imagery

High-resolution iris image reconstruction from low-resolutio...

引用

Conference on advanced signal processing algorithms, architectures, and implementations XvI

作者： Barnard, R. Pauca, v. P. Torgersen, T. C. Plemmons, R. J. Prasad, S. van der Gracht, J. Nagy, J. Chung, J. Behrmann, G. Mathews, S. Mirotznik, M. Wake Forest Univ Dept Comp Sci Winston Salem NC 27109 USA Emory Univ Dept Math & Comp Sci Atlanta GA 30322 USA Wake Forest Univ Dept Math Winston Salem NC 27109 USA Holospex Inc Columbia MD 21044 USA EM Photon Inc Newark DE 19711 USA Catholic Univ Amer Dept Elect Engn & Comp Sci Washington DC 20064 USA Univ New Mexico Ctr Adv Studies Albuquerque NM 87131 USA Univ New Mexico Dept Phys & Astron Albuquerque NM 87131 USA

ISBN: (纸本)0819463922

We investigate the use of a novel multi-lens imaging system in the context of biometric identification, and more specifically, for iris recognition. Multi-lenslet cameras offer a number of significant advantages over standard single-lens camera systems, including thin form-factor and wide angle of view. By using appropriate lenslet spacing relative to the detector pixel pitch, the resulting ensemble of images implicitly contains subject information at higher spatial frequencies than those present in a single image. Additionally, a multi-lenslet approach enables the use of observational diversity, including phase, polarization, neutral density, and wavelength diversities. For example, post-processing multiple observations taken with differing neutral density filters yields an image having an extended dynamic range. Our research group has developed several multi-lens camera prototypes for the investigation of such diversities. In this paper, we present techniques for computing a high-resolution reconstructed image from an ensemble of low-resolution images containing sub-pixel level displacements. The quality of a reconstructed image is measured by computing the Hamming distance between the Daugman(4) iris code of a conventional reference iris image, and the iris code of a corresponding reconstructed image. We present numerical results concerning the effect of noise and defocus blur in the reconstruction process using simulated data and report preliminary work on the reconstruction of actual iris data obtained with our camera prototypes.

关键词： Cameras Iris recognition Image resolution Sensors Image registration Image quality Charge-coupled devices Imaging systems Prototyping Point spread functions

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Context-driven partitioning of signaling energy (CDPSE) to help counter interference in wireless communications

Context-driven partitioning of signaling energy (CDPSE) to h...

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Proceedings of the 1999 advanced signal processing algorithms, architectures, and implementations IX

作者： Hershey, John Hladik, Stephen M. Korkosz, Richard A. General Electric Corp Research & Development Cent Niskayuna United States

The idea is (i) to use a variable energy allocation per signaling symbol and (ii) to pseudorandomize the order in which signaling symbols are transmitted. This strategy will allow the most important part of the sensor data to be (i) decorrelated against periodic unequal power interfering noise and specifically (ii) where that noise is purposely tailored or allocated in an attempt to provide maximum disruption of information transport as in 'smart' jamming. In a very real sense, perfect compression followed by this method leads to a genre of spread spectrum known as Time Hopping (TH).

关键词： signal processing

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A subspace approach to determining sensor gain and phase with applications to array processing

A subspace approach to determining sensor gain and phase wit...

引用

advanced algorithms and architectures for signal processing I 1986

作者： Paulraj, A. Shan, T.J. Reddy, v.U. Kailath, T. Information Systems Laboratory Stanford University StanfordCA94305 United States

Exact characterization of the array in terms of its geometry and the sensor gain and phase is important in beamforming and directions-of-arrival estimation problems. In practice the sensor gain and phase may not be known exactly due to drift in the sensor characteristics. We present a subspace approach which uses the received array signals to estimate the sensor gain and phase. We assume that the directions-of-arrival of some of the several sources that impinge on the array are known and show how this information can be used to determine sensor parameters. The resulting estimates can then be used to improve the robustness of array processing algorithms both for directions-of-arrival estimation and beamforming. Results of simulations carried out to verify the performance of this method are presented. © 1986 SPIE. All rights reserved.

关键词： Array processing

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Robust audio watermarking for copyright protection

Robust audio watermarking for copyright protection

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Proceedings of the 1999 advanced signal processing algorithms, architectures, and implementations IX

作者： Wu, Chung-Ping Su, Po-Chyi Kuo, C.-C.Jay Media Fair Inc Monterey Park United States

A digital audio watermarking scheme of low complexity is proposed in this research as an effective way to deter users from misusing or illegally distributing audio data. Previous work on audio watermarking has primarily focused on the inaudibility of the embedded watermark and its robustness against attacks such as compression and noise. In this research, special attention is paid to the synchronization attack caused by casual audio editing or malicious random cropping, which is a low-cost yet effective attack to watermarking algorithms developed before. The proposed scheme is based on audio content analysis and watermark embedding in the Fourier transform domain. A blind watermark detection technique is developed to identify the embedded watermark under various types of attacks.

关键词： Digital signal processing

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Compilation time analysis to minimize run-time overhead in preemptive scheduling on multiprocessors

Compilation time analysis to minimize run-time overhead in p...

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advanced signal processing: algorithms, architectures, and implementations v

作者： Wauters, Piet Lauwereins, Rudy Peperstraete, J. Katholieke Univ. Leuven Heverlee Belg

ISBN: (纸本)0819416207

This paper describes a scheduling method for hard real-time Digital signal processing (DSP) applications, implemented on a multi-processor. Due to the very high operating frequencies of DSP applications (typically hundreds of kHz) runtime overhead should be kept as small as possible. Because static scheduling introduces very little run-time overhead it is used as much as possible. Dynamic pre-emption of tasks is allowed if and only if it leads to better performance in spite of the extra run-time overhead. We essentially combine static scheduling with dynamic pre-emption using static priorities. Since we are dealing with hard real-time applications we must be able to guarantee at compile-time that all timing requirements will be satisfied at run-time. We will show that our method performs at least as good as any static scheduling method. It also reduces the total amount of dynamic pre-emptions compared with run time methods like deadline monotonic scheduling.

关键词： Digital signal processing

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Collection and processing of acoustic and seismic array data for source localizaton

Collection and processing of acoustic and seismic array data...

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advanced signal processing algorithms, architectures, and implementations Xv

作者： Asgari, S. Stafsudd, J.Z. Chen, C.E. Ali, A. Hudson, R.E. Whang, D. Lorenzelli, F. Yao, K. Taciroglu, E. Electrical Engineering Department University of California Los Angeles CA United States Civil and Env. Engineering Department University of California Los Angeles CA United States

Distributed sensor networks have been proposed for a wide range of applications. In this paper, our goal is to locate a wideband source, generating both acoustic and seismic signals, using both seismic and acoustic sensors. For a far-field acoustic source, only the direction-of-arrival (DOA) in the coordinate system of the sensors is observable. We use the approximate Maximum-Likelihood (AML) method for DOA estimations from several acoustic arrays. For a seismic source, we use data collected at a single tri-axial accelerometer to perform DOA estimation. Two seismic DOA estimation methods, the eigen-decomposition of the sample covariance matrix method and the surface wave method are used. Field measurements of acoustic and seismic signals generated by vertically striking a heavy metal plate placed on the ground in an open field are collected. Each acoustic array uses four low-cost microphones placed in a square configuration and separated by one meter. The microphone outputs of each array are collected by a synchronized A/D recording system and processed locally based on the AML algorithm for DOA estimation. An array of six tri-axial accelerometers arranged in two rows whose outputs are fed into an ultra low power and high resolution network-aware seismic recording system. Field measured data from the acoustic and seismic arrays show the estimated DOAs and consequent localizations of the source are quite accurate and useful. Beamforming, Source localization,.

关键词： Acoustic arrays

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CORDIC algorithms in four dimensions

CORDIC algorithms in four dimensions

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advanced signal-processing algorithms, architectures, and implementations

作者： Delosme, Jean-Marc Hsiao, Shen-Fu Yale Univ New Haven United States

CORDIC algorithms offer an attractive alternative to multiply-and-add based algorithms for the implementation of two-dimensional rotations, preserving either norm: (x2 + y2) 1/2 or (x2 - y2) 1/2 . Indeed these nor whose computation is a significant part of the evaluation of the two-dimensional rotations, are computed much more easily by the CORDIC algorithms. However the part played by norm computations in the evaluation of rotations becomes quickly small as the dimension of the space increases. Thus, in spaces of dimension 5 or more, there is no practical alternative to multiply-and-add based algorithms. In the intermediate region, dimensions 3 and 4, extensions of the CORDIC algorithms are an interesting option. The four-dimensional extensions are particularly elegant and are the main object of this paper.

关键词： signal processing

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Parallel algorithms for automatic target recognition using laser radar imagery

Parallel algorithms for automatic target recognition using l...

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advanced signal-processing algorithms, architectures, and implementations

作者： Forman Jr., Arthur v. Sullivan, Daniel J. Chang, Arthur W. Martin Marietta Electronic Systems Orlando United States

This paper describes two techniques for automatic recognition of surface targets from an airborne platform using an imaging laser radar sensor. The first technique rotates a three-dimensional model of the target in real time to enable a generalized Hough transform to match the ladar image to the target's key discriminating features as a basis for target identification. The second technique uses a variation on minimum average correlation energy filters to perform robust target identification. Examples illustrating the application of these algorithms are presented, along with a description of a real-time implementation of the critical parts of the algorithms on a 40,000-processor systolic array based on the Geometric Arithmetic Parallel Processor (GAPPTM) chip.

关键词： Radar, Optical

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Efficient beam-based adaptive processing for planar arrays

Efficient beam-based adaptive processing for planar arrays

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advanced signal-processing algorithms, architectures, and implementations

作者： Kratzer, Steven G. Supercomputing Research Cent Bowie United States

Beam-based adaptive processing is an economical way to achieve good interference rejection performance from an adaptive receiving array, at much less computational cost than full element-based methods. However, to exploit this potential for planar arrays it is necessary to identify, in real time, which beams must be retained for adaptive cancellation. This paper analyzes the beam-selection problem and presents a computationally efficient algorithm that performs real-time beam selection.

关键词： signal Filtering and Prediction

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Efficiently and Transparently Maintaining High SIMD Occupancy in the Presence of Wavefront Irregularity

Efficiently and Transparently Maintaining High SIMD Occupanc...

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作者： Cole, Stephen v. Washington University in St. Louis

学位级别：Ph.D.

Demand is increasing for high throughput processing of irregular streaming applications; examples of such applications from scientific and engineering domains include biological sequence alignment, network packet filtering, automated face detection, and big graph algorithms. With wide SIMD, lightweight threads, and low-cost thread-context switching, wide-SIMD architectures such as GPUs allow considerable flexibility in the way application work is assigned to threads. However, irregular applications are challenging to map efficiently onto wide SIMD because data-dependent filtering or replication of items creates an unpredictable data wavefront of items ready for further processing. Straightforward implementations of irregular applications on a wide-SIMD architecture are prone to load imbalance and reduced occupancy, while more sophisticated implementations require advanced use of parallel GPU operations to redistribute work efficiently among threads. This dissertation will present strategies for addressing the performance challenges of wavefront-irregular applications on wide-SIMD architectures. These strategies are embodied in a developer framework called Mercator that (1) allows developers to map irregular applications onto GPUs according to the streaming paradigm while abstracting from low-level data movement and (2) includes generalized techniques for transparently overcoming the obstacles to high throughput presented by wavefront-irregular applications on a GPU. Mercator forms the centerpiece of this dissertation, and we present its motivation, performance model, implementation, and extensions in this work.

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