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检索条件"主题词=Algorithm development"

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The method of Low-orbit satellite ambiguity fixing on Network RTK

The method of Low-orbit satellite ambiguity fixing on Networ...

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International Conference on Space Information Technology 2009

作者： Pan Shuguo Wang Qing Wang Shanshan Ke Fuyang Southeast Univ Sch Instrument Sci & Engn Nanjing Peoples R China

ISBN: (纸本)9780819480798

Low-orbit satellite ambiguity fixing is the import factor affecting GPS network difference reliability. In this paper, the satellite will be selected as reference satellite by elevation angle of satellite and barycenter of triangle to construct weight matrix. Quickly resolving double difference wide ambiguity based on wide-lane combination, fixing ambiguity of L1/L2 by LAMBDA algorithm, estimating troposphere error in non-ionosphere combination by HOPFIELD model, improving 0.3cycle float ambiguity accuracy of low elevation angle satellite, applying this method to develop network differential systems by our own intellectual property rights. The actual tests show that: accessing to the system the actual mobile station position plane accuracy is better than 5cm.

关键词： Satellites Troposphere algorithm development Error analysis Global Positioning System Reliability Data processing Geodesy Intellectual property Systems modeling

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The relationship between shape under similarity transformations and shape under affine transformations

The relationship between shape under similarity transformati...

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7th Conference on Mathematics of Data/Image Coding, Compression, and Encryption

作者： Stiller, PF Texas A&M Univ College Stn TX 77843 USA

ISBN: (纸本)0819454990

Recent progress in shape theory, including the development of object/image equations for shape matching and shape space metrics (especially object/image metrics), is now being exploited to develop new algorithms for target recognition. This theory makes use of advanced mathematical techniques from algebraic and differential geometry to construct generalized shape spaces for various projection and sensor models, and then uses that construction to find natural metrics that express the distance (difference) between two configurations of object features, two configurations of image features, or an object and an image pair. Such metrics produce the most robust tests for target identification;at least as far as target geometry is concerned. Moreover, they also provide the basis for efficient hashing schemes to do target identification quickly and provide a rigorous foundation for error analysis in ATR.

关键词： Target recognition algorithm development Image sensors algorithms Detection and tracking algorithms Matrices Sensors Error analysis Mathematical modeling Mathematics

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STAR FIELD IDENTIFICATION algorithm - PERFORMANCE VERIFICATION USING SIMULATED STAR FIELDS

STAR FIELD IDENTIFICATION ALGORITHM - PERFORMANCE VERIFICATI...

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Infrared Remote Sensing Conference

作者： SCHOLL, MS ALENKA ASSOCIATES TEMPEAZ 85285

ISBN: (纸本)0819412686

A six-feature all-sky star field identification algorithm has been developed. The minimum identifiable star pattern element consists of an oriented star triplet defined by three stars, their celestial coordinates and visual magnitudes. The performance of the star pattern identification algorithm has been verified using software simulation.

关键词： Stars Cameras Remote sensing Tolerancing Infrared radiation Infrared sensors algorithm development Visualization CCD cameras Computer simulations

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ρ-domain optimum bit allocation and accurate rate control for DCT video coding

ρ-domain optimum bit allocation and accurate rate control f...

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Conference on Visual Communications and Image Processing 2002

作者： He, ZH Chen, CW Sarnoff Co Interact Med Grp Princeton NJ 08543 USA

ISBN: (纸本)0819444111

In this research, we have developed a novel and unified rate-distortion (R-D) analysis framework for all standard DCT-based video coding systems, including MPEG-2, H.263, and MPEG-4. Within this framework, we consider the coding bit rate as a function of the percentage of zeros among the quantized DCT coefficients. From our extensive simulations over a wide range of video data, we observe that this rate function appears linear in all standard video coding. Based on Shannon's source coding theorem, we provide a heuristic justification for this linear rate model, which helps us better understand the unique behavior of the video encoder. Within the proposed R-D analysis framework, we have also developed an accurate distortion model. It is expected that this simple yet unified R-D modeling shall have significant impact on various video coding related research and development works, including rate control, bit allocation, joint source and channel coding, and so on. In this work, we have developed a unified bit allocation and rate control algorithm for MPEG-2, H.263 and MPEG-4 video coding. Compared to other rate control algorithms reported in the literature, the proposed algorithm controls the coding bit rate more accurately and robustly. In addition, the coded video quality is significantly improved.

关键词： Video coding Video Distortion Quantization Systems modeling algorithm development Detection and tracking algorithms Computer programming Control systems Image compression

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INSITU EVALUATION OF A SHIPS SHADOW 12

INSITU EVALUATION OF A SHIPS SHADOW

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Ocean Optics XII Conference

作者： WEIR, CT SIEGEL, DA MICHAELS, AF MENZIES, DW UNIV CALIF SANTA BARBARA CTR REMOTE SENSING & ENVIRONM OPTSANTA BARBARACA 93106

ISBN: (纸本)081941574X

In situ measurements of optical properties made from a ship can be biased by the ship's shadow. In an effort to evaluate the ship shadow perturbation created by the R/V Weatherbird II, profiles of downwelling irradiance, E_d(z,(lambda) ), upwelling radiance, L_u(z,(lambda) ), as well as derived apparent optical properties (AOPs) were obtained at distances of 1, 3, 6 and >= 20 m off the ship's stern. Two statistical analyses are explored here. The first compares the mean difference between simultaneously obtained fluxes and AOPs sampled at distances greater than 20 m from the ship to those taken 1 and 6 m off the stern. The second analysis compares derived AOPs taken at each of the four distances throughout the length of the experiment. Only rarely are significant differences found for data beyond three meters off the ship's stern; however at 1 m off the stern significant discrepancies are intermittently observed. This work illustrates that the inherent sources of noise in determining fluxes and AOPs in the upper ocean are generally greater than the effects incurred by the ship's own shadow under optimal conditions.

关键词： Calibration Ocean optics Optical properties Statistical analysis algorithm development Signal attenuation Sun Reflectivity Radon Remote sensing

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REGISTRATION OF TRANSPORTATION DAMAGES USING A HIGH-RESOLUTION CCD CAMERA

REGISTRATION OF TRANSPORTATION DAMAGES USING A HIGH-RESOLUTI...

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Conferences on High-Resolution Cameras and Recording Devices, and Laser Scanning and Recording Systems

作者： MULLER, M BURMESTER, A DOERNER INST BAYER STAATSGEMALDESAMMLUNGEN D-80799 MUNICHGERMANY

ISBN: (纸本)0819412368

This paper proposes a new approach to monitor the condition of a painting. That is the acquisition of the surface structure of the painting. As transportation damages are known to affect the crack pattern, very detailed images (cracks < 0.1 mm) are required. A compromise between this requirement and today's feasibility consists in using resolutions of about 20 pixel/mm with 8 bit, meaning images of 20k X 20k for a painting of 1 m X 1 m. A Kontron ProgRes 3000 on a high precision 3D motorized frame (repositioning accuracy < 0.01 mm) is used for the acquisitions before and after transportation. Each pair of images is resampled to compensate for geometrical distortions. The crack network is then detected by using line detection algorithms derived from mathematical morphology. The images are finally superimposed and changes can be detected manually or automatically. While the main focus of this contribution is spent on technical details, case studies are used to discuss recent applications.

关键词： Image resolution CCD cameras Image processing algorithm development Cameras Detection and tracking algorithms Image registration Mathematical morphology 3D acquisition Climatology

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AUTOMATIC QUALITY-CONTROL INSPECTION OF LIQUID-CRYSTAL DISPLAYS 2

AUTOMATIC QUALITY-CONTROL INSPECTION OF LIQUID-CRYSTAL DISPL...

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CONF ON MACHINE VISION APPLICATIONS, ARCHITECTURES, AND SYSTEMS INTEGRATION 2

作者： OSHEA, C OCONNOR, P Cork Regional Technical College (Ireland)

ISBN: (纸本)0819413291

In the modern computer industry the Laptop computer has become an exciting and revolutionary product. While some engineers work to make computers bigger, faster and more powerful, others are striving to make them possible. Due to the obvious size and power constraints it is necessary to use Liquid Crystal Devices (LCD) in Laptop Computers. These displays consist of matrices of individual LCD cells. These individual cells form the pixels of the screen. It is thus possible to display a complex pattern on the screen by controlling the state of these individual pixels. In the Apple Computer PowerBook^TM Laptop computer each pixel is 0.5 mm square and on the display there is a total of 640*480 pixels.

关键词： LCDs Fourier transforms Image processing Particles Inspection algorithm development Video Automatic control Binary data Visualization

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LEARNING THE BEHAVIOR OF BOOLEAN CIRCUITS FROM EXAMPLES USING CULTURAL algorithmS 2

LEARNING THE BEHAVIOR OF BOOLEAN CIRCUITS FROM EXAMPLES USIN...

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2ND INTERNATIONAL CONF ON ADAPTIVE LEARNING SYSTEMS

作者： REYNOLDS, RG SVERDLIK, W Wayne State Univ. (United States) Lawrence Technological Univ. (United States)

ISBN: (纸本)0819411981

In this paper an approach to evolutionary learning based upon principles of cultural evolution is developed. In this dual-inheritance system, there is an evolving population of trait sequences as well as an associated belief space. The belief space is derived from the behavior of individuals and is used to actively constrain the traits acquired in future populations. Shifts in the representation of the belief space and the population are supported. The approach is used to solve several versions of the BOOLE problem; F6, F11, and F20. The results are compared with other approaches and the advantages of a dual inheritance approach using cultural algorithms is discussed.

关键词： Binary data Genetic algorithms Genetics algorithm development Modulation Telecommunications Multiplexers Prototyping Agriculture Computer science

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NEURAL NETS IN INFORMATION-RETRIEVAL - A CASE-STUDY OF THE 1987 PRAVDA

NEURAL NETS IN INFORMATION-RETRIEVAL - A CASE-STUDY OF THE 1...

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1ST CONF ON SCIENCE OF ARTIFICIAL NEURAL NETWORKS

作者： SCHOLTES, JC Univ. of Amsterdam (Netherlands)

ISBN: (纸本)0819408751

This paper presents an implemented neural method for free-text information filtering. A specific interest (or `query') is taught to a Kohonen feature map. By using this network as a neural filter on a dynamic free-text data base, only associated subjects are selected from this data base. The method is compared with some classical statistical information-retrieval algorithms. Various simulations show that the neural net indeed converges toward a proper representation of the query. The algorithm seems well scalable (linear complexity in time and space) resulting in high speeds, little memory needs, and easy maintainability. By combining research results from connectionist natural language processing (NLP) and information retrieval (IR), a better understanding of neural nets in NLP, a clearer view of the relation between neural nets and statistical pattern recognition, and an increased information retrieval quality are obtained.

关键词： Neural networks Neurons Pattern recognition Statistical analysis algorithm development Brain mapping Analytical research Sensors Data processing Systems modeling

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APPLICATION OF DRIFT SPECTROSCOPY FOR THE MATCHING OF DYE EXTRACTS FROM SMALL TEXTILE SAMPLES 8

APPLICATION OF DRIFT SPECTROSCOPY FOR THE MATCHING OF DYE EX...

引用

8TH INTERNATIONAL CONF ON FOURIER TRANSFORM SPECTROSCOPY

作者： KOKOT, S CARSWELL, S Queensland Univ. of Technology (Australia)

ISBN: (纸本)0819407062

A DRIFT method for collecting spectra from dye mixtures (50 - 500 ng) extracted from small textile samples (2 mm yarn) is outlined. Results of experiments using library search routines for matching of IR spectra of simple (< 5 components) dye mixtures indicate that matches can be distinguished satisfactorily, however, with complex (8 - 14 components) dye mixture matching of duplicate spectra is less well defined. The application of principal component analysis for matching and discrimination of small dye extracts from a worn garment suggests that this is a useful approach and can add to the TLC information about the sample.

关键词： Principal component analysis Spectroscopy Forensic science Fourier spectroscopy Fourier transforms Statistical analysis algorithm development Chemistry Infrared spectroscopy Spectral resolution

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