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检索条件"主题词=Algorithm development"

共 1737 条记录，以下是221-230 订阅

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Arithmetic gain of the Lifting Scheme

Arithmetic gain of the Lifting Scheme

引用

Conference on Wavelets - Applications in Signal and Image Processing IX

作者： Reichel, J VisioWave Corp R&D Ctr CH-1024 Ecublens Switzerland

ISBN: (纸本)0819441929

The Lifting Scheme (LS) is a very efficient implementation of the Discrete Wavelet transform (DWT). In this work we compute the arithmetic gain realized when the LS is used instead of conventional filter banks. It is shown that contrary to was was presented in the original work from Sweldens again of four is possible. However the LS should be used with care as it can increase the memory bandwidth. Some implementations are presented together with their impact on the bandwidth.

关键词： Discrete wavelet transforms Optical filters Finite impulse response filters Linear filtering Image filtering Electronic filtering Image compression algorithm development Matrices Wavelets

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DIGITAL IMAGE-PROCESSING OF HOLOGRAPHIC SOUNDFIELD IMAGES 4

DIGITAL IMAGE-PROCESSING OF HOLOGRAPHIC SOUNDFIELD IMAGES

引用

CONF ON LASER INTEROMETRY 4 : COMPUTER-AIDED INTERFEROMETRY

作者： CROSTACK, HA MEYER, EH POHL, KJ Qualitaetszentrum Dortmund GmbH & Co. KG (Germany) Univ. Dortmund (Germany)

ISBN: (纸本)0819406813

The operaUon of machines and plants often leads to a strong loading of near-surface regions. Consequently, the non-destructive testing (NDT) of these regions during production as well as inspection is of high interest. Besides flaw detection the used test method should allow an exact flaw description. Furthermore contactiess techniques and the possibility of automation are points of interest. One technique which fulfils most of these requirements is the holographic soundfield visualization /1/. This technique allows large area detection of ultrasound (US) surface waves by means of opto-holographic methods. The test result is given by an image of the object surface covered with interference fringes representing the soundwave fronts. Until now only visual evaluation of the recorded soundfield images is performed. Because of the superposition of flaw pattern with the pattern of the insonicated soundwave, an exact flaw analysis appears difficult. with respect to precise as well as automatic testing digital image processing can be applied. The main task of image processing of soundfield images should be the isolation of flaw information from the background which is given by the insonicated wave and the image of the object surface.

关键词： Holography Image processing Digital image processing Image filtering Visualization Detection and tracking algorithms Holograms algorithm development Optical filters Ultrasonics

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Genetic optimization of the HSTAMIDS landmine detection algorithm

Genetic optimization of the HSTAMIDS landmine detection algo...

引用

Conference on Detection and Remediation Technologies for Mines and Minelike Targets IX

作者： Konduri, R Solomon, G DeJong, K Duvoisin, H Bartosz, E CyTerra Corp Orlando FL 32809 USA

ISBN: (纸本)0819453382

CyTerra's dual sensor HSTAMIDS system has demonstrated exceptional landmine detection capabilities in extensive government-run field tests. Further optimization of the highly successful PentAD-class algorithms for Humanitarian Dernining (HD) use (to enhance detection (Pd) and to lower the false alarm rate (FAR)) may be possible. PentAD contains several input parameters, making such optimization computationally intensive. Genetic algorithm techniques, which formerly provided substantial improvement in the detection performance of the metal detector sensor algorithm alone, have been applied to optimize the numerical values of the dual-sensor algorithm parameters. Genetic algorithm techniques have also been applied to choose among several sub-models and fusion techniques to potentially train the HSTAMIDS HD system in new ways. In this presentation we discuss the performance of the resulting algorithm as applied to field data.

关键词： Genetic algorithms Land mines Detection and tracking algorithms Genetics Optimization (mathematics) Sensors algorithm development MATLAB Metals Principal component analysis

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Characterization of nanoscale multilayer structures upon thermal annealing 4

Characterization of nanoscale multilayer structures upon the...

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Conference on EUV and X-ray Optics - Synergy between Laboratory and Space IV

作者： Makhotkin, I. A. Zameshin, A. van de Kruijs, R. W. E. Yakshin, A. Bijkerk, F. Univ Twente Ind Focus Grp XUV Opt MESA Inst Nanotechnol NL-7522 NB Enschede Netherlands

ISBN: (纸本)9781628416312

Obtaining a high quality physical description of the layered structure of multilayer based optical coatings is an essential part of the optimization of their optical performance. Grazing incidence X-ray reflectivity (GIXR) is one of the most informative and easy-to-use non-destructive tools for the analysis of multilayer structures. The typical challenge of GIXR structural characterization is the reconstruction of the layered structure from fitting simulated data to experimental data. Here we present an example of the application of a newly developed, free-form, GIXR analysis to the characterization of heat induced structural changes in periodic La/B multilayers. This example shows that the developed algorithm is capable of reconstructing electron density profiles in cases where a classical non free-form approach generally fails.

关键词： Multilayers Annealing Reflectivity algorithm development Data modeling Interfaces X-rays Grazing incidence Mirrors Reconstruction algorithms

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TRACKING ABILITY OF L-LEVEL MLP BASED EQUALIZERS IN NONLINEAR MICROWAVE RADIO CHANNELS IN THE PRESENCE OF MULTIPATH-FADING 5

TRACKING ABILITY OF L-LEVEL MLP BASED EQUALIZERS IN NONLINEA...

引用

5th International Conference on Applications of Artificial Neural Networks

作者： LUK, E FAGAN, AD NATL UNIV IRELAND UNIV COLL DUBLIN DEPT ELECTR & ELECT ENGNDUBLIN 4IRELAND

ISBN: (纸本)0819415472

The performance of microwave digital radio systems is severely degraded by multipath fading and also by the nonlinear power amplifier at the transmitter, the combined effects of these result in a time varying nonlinear channel. In this paper, the multilayer perceptron (MLP) based equalizer is investigated for use on such channels. It is found to outperform the conventional approach, that is, the use of a transversal equalizer at the receiver operating with a signal predistorter placed before the non-linear power amplifier at the transmitter. An L- level non-linear function is used as a node activation for the MLP. Two update schemes are investigated, one being a complex version of the back propagation algorithm, the other a complex version of the delta-bar-delta algorithm.

关键词： Amplifiers Transmitters Microwave radiation Receivers Nonlinear optics Electronic filtering algorithm development Automatic control Complex systems Radio propagation

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Recent progress in neural network estimation of atmospheric profiles using microwave and hyperspectral infrared sounding data in the presence of clouds

Recent progress in neural network estimation of atmospheric ...

引用

Conference on algorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery XIII

作者： Blackwell, William J. Pieper, Michael MIT Lincoln Lab Lexington MA 02173 USA

ISBN: (纸本)9780819471574

Recent work has demonstrated the feasibility of neural network estimation techniques for atmospheric profiling in partially cloudy atmospheres using combined microwave (MW) and hyperspectral infrared (IR) sounding data. In this paper, the retrieval performance in problem areas (over land, near the poles, elevated terrain, etc.) is examined. Retrieval performance has been improved by stratifying the neural network training data into distinct groups based on geographical (latitude, for example), geophysical (atmospheric pressure, for example), and sensor geometrical (scan angle, for example) considerations. The spectral information content of cloud signatures in Infrared Atmospheric Sounding Interferometer (IASI) data is also explored. A Principal Components Analysis. is presented that indicates that most variability due to clouds is contained in the first two eigenvectors. A novel statistical method for the retrieval of atmospheric temperature and moisture (relative humidity) profiles has been developed and evaluated with sounding data from the Atmospheric InfraRed Sounder (AIRS) and the Advanced Microwave Sounding Unit (AMSU). The present work focuses on the cloud impact on the AIRS radiances and explores the use of stochastic cloud clearing mechanisms together with neural network estimation. A stand-alone statistical algorithm will be presented that operates directly on cloud-impacted AIRS/AMSU data, with no need for a physical cloud clearing process. The algorithm is implemented in three stages. First, the infrared radiance perturbations due to clouds are estimated and corrected by combined processing of the infrared and microwave data using a Stochastic Cloud Clearing (SCC) approach. The cloud clearing of the infrared radiances was performed using principal components analysis of infrared brightness temperature contrasts in adjacent fields of view and microwave-derived estimates of the infrared clear-column radiances to estimate and correct the radiance contamina

关键词： Clouds Neural networks Infrared radiation Sensors Microwave radiation Stochastic processes Infrared signatures Principal component analysis algorithm development Evolutionary algorithms

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Parametric quality assessment of synthesized textures

Parametric quality assessment of synthesized textures

引用

Conference on Human Vision and Electronic Imaging XVI

作者： Swamy, Darshan Siddalinga Butler, Kellen J. Chandler, Damon M. Hemami, Sheila S. Oklahoma State Univ Sch Elect & Comp Engn Lab Computat Percept & Image Qual Stillwater OK 74078 USA Cornell Univ Sch Ele & Comp Engn Ithaca NY 14850 USA

ISBN: (纸本)9780819484024

In this paper, we present the results of a study designed to investigate the visual factors which contribute to the perceived quality of synthesized textures. A psychophysical experiment was performed in which subjects rated the quality of textures synthesized from a variety of modern texture-synthesis algorithms. The ratings were given in terms of how well each synthesized texture represented a sample from the same material from which the original texture was obtained. The results revealed that the most detrimental artifact was lack of structural details. Other pronounced artifacts included: (1) misalignment of the texture patterns;(2) blurring introduced in the texture patterns;and (3) repeating the same patch again and again (tiling). Based on these results, we present an analysis of the efficacy of various measureable parameters at predicting the ratings. We show how a linear combination of the parameters from a parametric texture-synthesis algorithm demonstrates better performance at predicting the ratings compared to traditional quality-assessment algorithms.

关键词： Visualization Image quality algorithm development Image compression Computer engineering Databases Digital imaging Electronic imaging Image segmentation LCDs

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Line segment based image registration

Line segment based image registration

引用

Conference on Visual Communications and Image Processing 2008

作者： Li, Yong Stevenson, Robert L. Gai, Jiading Univ Notre Dame Dept Elect Engn Notre Dame IN 46556 USA

ISBN: (纸本)9780819469946

This paper proposes a line segment based image registration method. Edges are detected and partitioned into line segments. Line-fitting is applied onto every line segment to rule out those segments of high fitting error. For each segment in a reference image, putative matching segments in a test image are picked with the constraints obtained by analyzing affine transformations. Putative segment correspondences result in the correspondences of intersections of segments, which are used as matching points. An affine matrix is derived from those point correspondences and evaluated by the similarity metric. The segment correspondences ending up with higher similarity metrics are used to compute the final transformation. Experimental results show that the proposed method is robust especially when salient points can not be detected accurately.

关键词： Image segmentation Image registration Edge detection Sensors Feature extraction algorithm development Computer vision technology Image sensors Lithium Machine vision

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Learning Overcomplete Representations from Distributed Data: A Brief Review 5

Learning Overcomplete Representations from Distributed Data:...

引用

Conference on Compressive Sensing V - From Diverse Modalities to Big Data Analytics

作者： Raja, Haroon Bajwa, Waheed U. Rutgers State Univ Dept Elect & Comp Engn Piscataway NJ 08854 USA

ISBN: (纸本)9781510600980

Most of the research on dictionary learning has focused on developing algorithms under the assumption that data is available at a centralized location. But often the data is not available at a centralized location due to practical constraints like data aggregation costs, privacy concerns, etc. Using centralized dictionary learning algorithms may not be the optimal choice in such settings. This motivates the design of dictionary learning algorithms that consider distributed nature of data as one of the problem variables. Just like centralized settings, distributed dictionary learning problem can be posed in more than one way depending on the problem setup. Most notable distinguishing features are the online versus batch nature of data and the representative versus discriminative nature of the dictionaries. In this paper, several distributed dictionary learning algorithms that are designed to tackle different problem setups are reviewed. One of these algorithms is cloud K-SVD, which solves the dictionary learning problem for batch data in distributed settings. One distinguishing feature of cloud K-SVD is that it has been shown to converge to its centralized counterpart, namely, the K-SVD solution. On the other hand, no such guarantees are provided for other distributed dictionary learning algorithms. Convergence of cloud K-SVD to the centralized K-SVD solution means problems that are solvable by K-SVD in centralized settings can now be solved in distributed settings with similar performance. Finally, cloud K-SVD is used as an example to show the advantages that are attainable by deploying distributed dictionary algorithms for real world distributed datasets.

关键词： Associative arrays Clouds Optimization (mathematics) Chemical species Data modeling algorithm development Data processing Nickel Stochastic processes Image processing

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SEMIDIFFERENTIAL INVARIANTS - ALGEBRAIC-DIFFERENTIAL HYBRIDS

SEMIDIFFERENTIAL INVARIANTS - ALGEBRAIC-DIFFERENTIAL HYBRIDS

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3RD CONF ON HYBRID IMAGE AND SIGNAL PROCESSING

作者： KEMPENAERS, P VANGOOL, LJ OOSTERLINCK, A Catholic Univ. of Leuven (Belgium)

ISBN: (纸本)0819408670

In the realm of flexible automation, viewpoint independent object recognition will become increasingly important. An algorithm for the recognition of plane shapes under pseudo- perspective projection is presented. The method is based on the comparison of features that remain invariant under 2-D affine transformations. In particular, the work presented is part of the wider framework of semi-differential invariants. It was successfully tested on a database containing 42 objects.

关键词： Databases Image processing Affine motion model Signal processing Data modeling Image segmentation Object recognition Detection and tracking algorithms Edge detection algorithm development

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