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检索条件"主题词=Algorithm Development"

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LANL MTI science team experience

LANL MTI science team experience

引用

Conference on Imaging Spectrometry IX

作者： Balick, LK Borel, CC Chylek, P Clodius, WB Davis, AB Henderson, BG Galbraith, AE Lawson, SL Pope, PA Rodger, AP Theiler, JP Los Alamos Natl Lab Space & Remote Sensing Sci Grp Los Alamos NM 87545 USA

ISBN: (纸本)0819450324

The Multispectral Thermal Imager (MTI) is a technology test and demonstration satellite whose primary mission involved a finite number of technical objectives. MTI was not designed, or supported, to become a general purpose operational satellite. The role of the MTI science team is to provide a core group of system-expert scientists who perform the scientific development and technical evaluations needed to meet programmatic objectives. Another mission for the team is to develop algorithms to provide atmospheric compensation and quantitative retrieval of surface parameters to a relatively small community of MTI users. Finally, the science team responds and adjusts to unanticipated events in the life of the satellite. Broad or general lessons learned include the value of working closely with the people who perform the calibration of the data as well as those providing archived image and retrieval products. Close interaction between the Los Alamos National Laboratory (LANL) teams was very beneficial to the overall effort as well as the science effort. Secondly, as time goes on we make increasing use of gridded global atmospheric data sets which are products of global weather model data assimilation schemes. The Global Data Assimilation System information is available globally every six hours and the Rapid Update Cycle products are available over much of the North America and its coastal regions every hour. Additionally, we did not anticipate the quantity of validation data or time needed for thorough algorithm validation. Original validation plans called for a small number of intensive validation campaigns soon after launch. One or two intense validation campaigns are needed but are not sufficient to define performance over a range of conditions or for diagnosis of deviations between ground and satellite products. It took more than a year to accumulate a good set of validation data. With regard to the specific programmatic objectives, we feel that we can do a reasonabl

关键词： Clouds Aerosols Reflectivity Atmospheric modeling Calibration Data modeling Satellites algorithm development Model-based design Thermography

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Parametric Slant-Hadamard transforms

Parametric Slant-Hadamard transforms

引用

Conference on Image Processing - algorithms and Systems II

作者： Agaian, S Tourshan, K Noonan, JP Univ. of Texas/San Antonio (United States) Lockheed Martin Corp. (United States) Tufts Univ. (United States)

ISBN: (纸本)0819448141

The purpose of this paper is to develop a class of generalized parametric Slant-Hadamard transform of order (N = k(n), n = 2, 3,...) where k is an arbitrary integer and to present its fast algorithm. As special cases of this class are the classical Slant-Hadamard (k = 2 and beta(N) = 1), the generalized Slant-Hadamard beta(N) = 1), and the parametric Slant-Hadamard (k = 2) transforms. We will show that the parametric Slant-Hadamard transform is slightly superior to the DCT for compression of the geometric test images at a particular quantization matrix scaling factors.

关键词： Transform theory Image compression Signal processing algorithm development Quantization Image processing Data conversion Detection and tracking algorithms Pattern recognition Video compression

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Morphological processing for UCIR detection

Morphological processing for UCIR detection

引用

Conference on Optical Pattern Recognition XIV

作者： Casasent, D Yuan, C Ramamoorthy, L Braunreiter, D Brucks, T Carnegie Mellon Univ Dept Elect & Comp Engn Pittsburgh PA 15213 USA

ISBN: (纸本)0819449660

A study was conducted on the use of morphological processing for detection in Uncooled Infra Red (UCIR) data using the Clutter type 1 and Clutter type 2 databases. The CMO algorithm was used with various modifications. A fixed minimum peak value was used rather than a fraction of the maximum peak per image. This is much more realistic, since many real scenes will not contain targets. One-dimensional directional structuring elements (SEs) were used for the Close Minus Open algorithm. We used the range of gray levels within the output blob peaks (blob analysis) and larger windows in peak sorting to reduce false alarms. A new dilation minus erosion morphological algorithm gave the best result.

关键词： Detection and tracking algorithms Selenium Databases Target detection Sensors algorithm development Binary data Chaos Cobalt Missiles

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Multi-electrode complex-coupled DFB lasers for reduced spatial hole burning

Multi-electrode complex-coupled DFB lasers for reduced spati...

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6th International Conference on Applications of Photonic Technology

作者： Lestrade, M Champagne, A Maciejko, R Kasunic, KJ Adams, DM Ecole Polytech Optoelect Lab Montreal PQ H3C 3A7 Canada

ISBN: (纸本)0819451487

The effects of using multiple electrodes to reduce longitudinal spatial hole burning (LSHB) in a complex-coupled distributed feedback (DFB) laser are investigated. Using a time-domain model, we show that LSHB can be compensated by injecting more current into the center of the device. We also find that differential current injection has an effect on the threshold current and quantum efficiency of the DFB laser. Spectral characteristics are obtained by fast Fourier transform (FFT) of the time-domain data and we show that inhomogeneous current injection can also have an effect on the laser linewidth.

关键词： Electrodes Hole burning spectroscopy Transparency algorithm development Quantum efficiency Laser damage threshold Fourier transforms Instrument modeling Optical simulations Phase shifts

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Developing a CFAR filter for detecting point targets using a dynamic programming algorithm

Developing a CFAR filter for detecting point targets using a...

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Conference on Signal and Data Processing of Small Targets

作者： Madar, H Avishai, T Succary, R Rotman, SR Ben Gurion Univ Negev Dept Elect & Comp Engn IL-84105 Beer Sheva Israel

ISBN: (纸本)0819450774

A method to detect and track point targets in infrared imagery is briefly described. The final output of the algorithm is a single image containing scores related to the probability of a target being located at any particular pixel. This image will be analyzed to deterrrtine the presence and location of suspected targets, based on CFAR requirements.

关键词： Target detection Detection and tracking algorithms algorithm development Filtering (signal processing) Image processing Signal to noise ratio Computer programming Image filtering Image analysis Signal processing

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Remote resupply systems for unmanned FCS-related vehicles

Remote resupply systems for unmanned FCS-related vehicles

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Conference on Unmanned Ground Vehicle Technology V

作者： Murphy, R Gonzalez, N Fitz-Coy, N Papila, N Shyy, W Univ S Florida Ctr Robot Assisted Search & Rescue Tampa FL 33620 USA

ISBN: (纸本)0819449423

This paper summarizes a study on refueling and rearming FCS-related vehicles in the field. In keeping with the FCS philosophy, the resupply process should be unmanned. For the purposes of the study, a resupply (RS) system is defined as an autonomous robotic platform, which interacts with a combat vehicle (CV). The purpose of the interaction is transfer of liquid fuel and/or ammunition. The RS may be capable of providing both the fuel and the ammunition simultaneously, or there may be separate resupply vehicles, each dedicated to one consumable. The CV may be resupplied while on-station and operational or may be taken out of service and moved to a resupply point. The study proposed a resupply system, which consists of two RS vehicles (i.e., separate vehicles for fuel and ammunition) to refuel the CV. Four families of scenarios were considered: the RS moves to the CV ("door to door"), the RS and CV both move ("rendezvous"), the CV move the RS ("filling station"), and the CV move to a pod dropped nearby. The "door to door" scenario was rated the most feasible, with the rendezvous scenario a close second. The study ascertained that RS vehicles using a robotic manipulator for the transfer mechanism is based on best engineering practices and constitute a low risk design. The required level of autonomy to accomplish resupply is teleoperation, though a mixed-initiative approach poses relatively low risk. A teleoperator or simple mixed-initiative system can be completed in 3 years, and offers significant performance benefits. Full autonomy was determined to be too high risk, but mixed-initiative work could serve as a basis for evolving to full autonomy. The study also considered the impact of emerging technologies on resupply. The key technical risks in ascending order of investment priority are: platform design, munitions transfer mechanism, and human-robot interaction (HRI). The platform design and munitions transfer mechanism are lower risk than HRI, which is a relatively

关键词： Remote sensing Sensors Robotics Control systems algorithm development Fluorescence correlation spectroscopy Liquids Prototyping Telecommunications Navigation systems

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False alarm reduction by the And-ing of multiple multivariate Gaussian classifiers

False alarm reduction by the And-ing of multiple multivariat...

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

作者： Dobeck, GJ Cobb, JT USN Ctr Surface Warfare Coastal Syst Stn Dahlgren Div Panama City FL 32407 USA

ISBN: (纸本)0819449490

The high-resolution sonar is one of the principal sensors used by the Navy to detect and classify sea mines in minehunting operations. For such sonar systems, substantial effort has been devoted to the development of automated detection and classification (D/C) algorithms. These have been spurred by several factors including (1) aids for operators to reduce work overload, (2) more optimal use of all available data, and (3) the introduction of unmanned minehunting systems. The environments where sea mines are typically laid (harbor areas, shipping lanes, and the littorals) give rise to many false alarms caused by natural, biologic, and man-made clutter. The objective of the automated D/C algorithms is to eliminate most of these false alarms while still maintaining a very high probability of mine detection and classification (PdPc). In recent years, the benefits of fusing the outputs of multiple D/C algorithms have been studied. We refer to this as algorithm Fusion. The results have been remarkable, including reliable robustness to new environments. This paper describes a method for training several multivariate Gaussian classifiers such that their And-ing dramatically reduces false alarms while maintaining a high probability of classification. This training approach is referred to as the Focused- Training method. This work extends our 2001-2002 work where the Focused-Training method was used with three other types of classifiers: the Attractor-based K-Nearest Neighbor Neural Network (a type of radial-basis, probabilistic neural network), the Optimal Discrimination Filter Classifier (based linear discrimination theory), and the Quadratic Penalty Function Support Vector Machine (QPFSVM). Although our experience has been gained in the area of sea mine detection and classification, the principles described herein are general and can be applied to a wide range of pattern recognition and automatic target recognition (ATR) problems.

关键词： Feature selection Matrices Naval mines Detection and tracking algorithms Mining Land mines algorithm development Automatic target recognition Image classification Neural networks

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Source adaptive blind source separation: Gaussian models and sparsity

Source adaptive blind source separation: Gaussian models and...

引用

Wavelets - Applications in Signal and Image Processing X Conference

作者： Pham, DT Cardoso, JF Lab Modelisat & Calcul F-38041 Grenoble 9 France

ISBN: (纸本)0819450804

Using the time-frequency (or -scale) diversity of the source processes allows the blind source separation problem to be tackled within Gaussian models. In this work, we show that this approach amounts to minimizing a certain sparseness criterion for the energy distribution of the source over the time-frequency (or -scale) plane. We also explore the link between independence and sparsity and shows that other sparsity criteria (some examples of which are provided) can be used. Further, we introduce an adaptive method which tries to find the best sparse representation of the. source energy in order to exploit the sparsity in a most efficient way. An algorithm, adapted from that of Coifman and Wickerhauser has been developed for this end. Finally a simulation example has been given.

关键词： Chemical species Time-frequency analysis algorithm development Error analysis Matrices Statistical analysis Signal processing Statistical modeling Stochastic processes Wavelets

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Binary matrices, decomposition and multiply-add architectures

Binary matrices, decomposition and multiply-add architecture...

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Conference on Image Processing - algorithms and Systems II

作者： Sarukhanyan, H Agaian, S Astola, J Egiazarian, K NAS Armenia Inst Informat & Automat Problems Yerevan Armenia

ISBN: (纸本)0819448141

Binary matrices or (+/-1)-matrices have found numerous applications in coding, signal processing, and communications. In this paper, a general and efficient algorithm of decomposition of binary matrices is developed. As a special case, Hadamard matrices are considered. The proposed scheme requires no zero padding of the input data. The problem of the construction of 4n-point Hadamard transform is related to the Hadamard problem: the question of existence of Hadamard matrices. (It is not proved whether for every integer n, there exists an orthogonal 4n x 4n matrix with elements +/-1). The number of real operation in developed algorithms is reduced from O(N-2) to O(Nlog(2)N). Comparisons revealing the efficiency of the proposed algorithms with respect to the known ones are given. In particular, it is demonstrated that, in typical applications, the proposed algorithm is more efficient than the conventional Walsh Hadamard transform. Note that for Hadamard matrices of orders greater than or equal to 96 the general algorithm is more efficient than the classical Walsh-Hadamard transform whose order is a power of two. The algorithm has a simple and symmetric structure. The results of numerical examples are presented.

关键词： Matrices algorithm development Binary data Ytterbium Signal processing algorithms Radon Detection and tracking algorithms Image processing Reconstruction algorithms

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Resolution enhancement and sampling with wavelets and footprints

Resolution enhancement and sampling with wavelets and footpr...

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Wavelets - Applications in Signal and Image Processing X Conference

作者： Dragotti, PL Vetterli, M Univ London Imperial Coll Sci Technol & Med London SW7 2BT England

ISBN: (纸本)0819450804

In this paper, we consider classes of not bandlimited signals, namely, streams of Diracs and piecewise polynomial signals, and show that these signals can be sampled and perfectly reconstructed using wavelets as sampling kernel. Due to the multiresolution structure of the wavelet transform, these new sampling theorems naturally lead to the development of a new resolution enhancement algorithm based on wavelet footprints.(2) Preliminary results show that this algorithm is also very resilient to noise.

关键词： Wavelets Resolution enhancement technologies Reconstruction algorithms algorithm development Wavelet transforms algorithms Electronic filtering Filtering (signal processing) Interference (communication) Signal to noise ratio

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