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检索条件"主题词=Algorithm development"

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BAYESIAN NEURAL-NETWORK ATR FOR MULTIFEATURE SAR

BAYESIAN NEURAL-NETWORK ATR FOR MULTIFEATURE SAR

引用

Conference on algorithms for Synthetic Aperture Radar Imagery

作者： HILBERT, EE CHANG, CF LORAL DEF SYST ARIZONA LITCHFIELD PKAZ 85340

ISBN: (纸本)0819415340

This paper presents a description of a Bayesian neural network (BNN) automatic target recognition (ATR) algorithm specifically developed to efficiently exploit the correlated relationships between the joint dimensional distribution properties of the multiple features. A multidimensional clustering process is used to define a Parzen estimate which approximates the Bayesian a posteriori decision function, but without limiting constraints regarding multimodal or correlated density function forms in multidimensional feature space. The mathematical derivation is placed in the form of a multilayer neural network, including Kernel function variance adaptation to accommodate small training data sets, and Kernel function tail saturation for robust handling of multidimensional feature data not represented in the training data. The BNN is shown to be a hybrid Bayesian/neural net classifier. It has a robust Bayesian statistical classifier as an initial state, and a feedback learning structure which enables learning corrections localized only to the feature space in the vicinity of the error. In addition, a method is described for integrating scene context information, spatial constraints, and a priori probability information into the BNN classifier. Example uses of the BNN algorithm are discussed for recent programs which obtained multiple feature ATR improvements from using the BNN with multiple frequencies, polarizations, aspect angles, and 3D interferometric SAR features.

关键词： Automatic target recognition Target detection Target recognition Detection and tracking algorithms Neural networks Synthetic aperture radar Error analysis algorithm development Polarization Evolutionary algorithms

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Remote desktop access us a method of learning of programming in distance study

Remote desktop access us a method of learning of programming...

引用

14th International Conference on Interactive Collaborative Learning (ICL)/11th International Conference on Virtual-University (VU)

作者： Hubalovsky, Stepan Univ Hradec Kralove Fac Sci Hradec Kralove Czech Republic

ISBN: (纸本)9781457717475

Current trend of systems of virtual learning is development of mobile communications in the technological level, and integration of constructivist approaches to education in the educational level of. Constructivist pedagogy in addition to the benefits of digital communication points to the problem of the virtual learning such as missing forms of social interactions of elements that are common in the real school environment, lack of immediate feedback for students and teachers, and other aspects. The current concept inclined to more general system approach of virtual university, such comprehensive set of digital communication solutions with a focus on education. Virtual university cannot therefore be understood only as a computer system with access to the text and exercises that students complete by ticking presented options. The paper focuses on solution of distance learning course in programming, especially on elimination the problems associated with the practical skill and techniques of structured and object-oriented programming.

关键词： algorithm development programing object-oriented programming distance education remote desktop access

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GPI PSF subtraction with TLOCI: the next evolution in exoplanet/disk high-contrast imaging 4

GPI PSF subtraction with TLOCI: the next evolution in exopla...

引用

Conference on Adaptive Optics Systems IV

作者： Marois, Christian Correia, Carlos Galicher, Raphael Ingraham, Patrick Macintosh, Bruce Currie, Thayne De Rosa, Rob Natl Res Council Canada Victoria BC V9E 2E7 Canada Univ Porto Ctr Astrophys P-4150762 Oporto Portugal UPMC CNRS Observ Paris LESIA F-92195 Meudon France Denis Diderot Paris 7 F-92195 Meudon France Stanford Univ Stanford CA 94305 USA Univ Toronto Toronto ON M5S 3H4 Canada Arizona State Univ Sch Earth & Space Explorat Tempe AZ 85287 USA

ISBN: (纸本)9780819496164

To directly image exoplanets and faint circumstellar disks, the noisy stellar halo must be suppressed to a high level. To achieve this feat, the angular differential imaging observing technique and the least-squares Locally Optimized Combination of Images (LOCI) algorithm have now become the standard in single band direct imaging observations and data reduction. With the development and commissioning of new high-order high-contrast adaptive optics equipped with integral field units, the image subtraction algorithm needs to be modi fied to allow the optimal use of polychromatic images, field-rotated images and archival data. A new algorithm, TLOCI (for Template LOCI), is designed to achieve this task by maximizing a companion signal-to-noise ratio instead of simply minimizing the noise as in the original LOCI algorithm. The TLOCI technique uses an input spectrum and template Point Spread Functions (PSFs, generated from unocculted and unsaturated stellar images) to optimize the reference image least-squares coefficients to minimize the planet self-subtraction, thus maximizing its throughput per wavelength, while simultaneously providing a maximum suppression of the speckle noise. The new algorithm has been developed using on-sky GPI data and has achieved impressive contrast. This paper presents the TLOCI algorithm, on-sky performance, and will discuss the challenges in recovering the planet spectrum with high fidelity.

关键词： Planets Point spread functions Gemini Planet Imager Speckle Signal to noise ratio Contamination algorithm development Stars Photonic integrated circuits Methane

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Comparative study of ocean wave spectrum using ENVISAT SAR data and wave rider buoy data

Comparative study of ocean wave spectrum using ENVISAT SAR d...

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Conference on Microwave Remote Sensing of the Atmosphere and Environment V

作者： Pai, Jagadeesha Kumar, Raj Sarkar, Abhijit Hegde, A. Vittal Dwarakish, G. S. ISRO Ctr Space Applicat Ocean Sci Div MOGRESIPA Ahmadabad 380053 Gujarat India Natl Inst Technol Karnataka Dept Appl Mech & Hydraul Surathkal India

ISBN: (纸本)9780819465177

A comparative study of ENVISAT ASAR data and corresponding wave rider buoy data has been attempted. An algorithm has been developed to retrieve Ocean Wave Spectrum from SAR data. The resulting spectrum is compared with the wave rider buoy measured wave spectrum. To compute the 2-D image spectrum from multi-look SAR data, various corrections to the original SAR data has been applied. Thereafter, Modulation Transfer Function has been computed and utilized to convert image spectrum to the Ocean Wave Spectrum. This final ocean wave height spectrum is used to estimate the ocean wave spectral parameters and has been compared with the in-situ measurements and model derived wave spectrum. An attempt has also been made to process the Single Look Complex (SLC) data to reduce the speckle noise in the SAR data using Fast Fourier Transform (FFT).

关键词： Synthetic aperture radar Speckle Modulation transfer functions Stanford Linear Collider algorithm development Fourier transforms Image quality standards Wave propagation Data corrections Radar

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Cell Broadband Engine architecture as a DSP platform

Cell Broadband Engine architecture as a DSP platform

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Conference on Photonics Applications in Astronomy, Communications, Industry, and High-Energy Physics Experiments

作者： Szumski, Karol Malanowski, Mateusz Warsaw Univ Technol PL-00665 Warsaw Poland

ISBN: (纸本)9780819478139

The slowing pace of performance improvement in the commonly available processors is a cause of concern amongst many computational scientists. This combined with the ever increasing need for computational power has caused us to turn to alternative architectures in search of performance gains. Two main candidates were the Compute Unified Device Architecture (CUDA) and the Cell Broadband Engine (CELL BE) architecture. This paper focuses on the latter, outlining the architecture and basic programming paradigms, and also contains performance comparison of algorithms currently developed by our team.

关键词： Digital signal processing Computer architecture algorithm development Astronomy Computer programming Current controlled current source Photonics Physics

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VIDEO SCENE DECOMPOSITION WITH THE MOTION-PICTURE PARSER

VIDEO SCENE DECOMPOSITION WITH THE MOTION-PICTURE PARSER

引用

Conference on Digital Video Compression on Personal Computers: algorithms and Technologies

作者： DEARDORFF, E LITTLE, TDC MARSHALL, JD VENKATESH, D WALZER, R BOSTON UNIV DEPT ELECT COMP & SYST ENGNMULTIMEDIA COMMUN LABBOSTONMA 02215

ISBN: (纸本)0819414824

A motion picture can be modeled as a composition of many scenes where each scene is comprised of multiple shots. Thus, a conventional movie is a sequential aggregation of a large number of disparate image sequences. Within each image sequence or shot, there is consistency in image content and dynamics. This consistency in dynamics can be used in identifying scene changes for video segment decomposition and for techniques to improve data compression. We have developed an algorithm to use these dynamics for scene change detection and the decomposition of video streams into constituent logical shots. The algorithm uses intraframe image complexity and identifies scene transitions by considering short-term temporal dynamics. The algorithm has shown to be effective for detecting both abrupt scene changes (cuts) as well as smooth scene changes (fades and dissolves). This algorithm is used in an application we have developed called the Motion Picture Parser (MPP). The MPP automates the process of tagging segments of motion-JPEG-compressed movies. Segments are also tagged for subsequent semantic content-based retrieval in units of shots and scenes. The MPP application consists of a graphical user interface with various editing controls.

关键词： Video Data modeling Databases Video processing Video compression Control systems Motion models algorithm development Image processing algorithms and systems Image segmentation

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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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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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Genetic optimization of the HSTAMIDS landmine detection algorithm

Genetic optimization of the HSTAMIDS landmine detection algo...

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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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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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