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检索条件"主题词=Algorithm development"

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MODEL CALIBRATION AND BEAM CONTROL-SYSTEMS FOR STORAGE-RINGS

MODEL CALIBRATION AND BEAM CONTROL-SYSTEMS FOR STORAGE-RINGS

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Conference on Electron-Beam Sources of High-Brightness Radiation

作者： CORBETT, WJ LEE, MJ ZIEMANN, V STANFORD UNIV STANFORD LINEAR ACCELERATOR CTRSTANFORDCA 94305

ISBN: (纸本)0819412627

Electron beam storage rings and linear accelerations are rapidly gaining worldwide popularity as scientific devices for the production of high-brightness synchrotron radiation. Today, everybody agrees that there is a premium on calibrating the storage ring model and determining errors in the machine as soon as possible after the beam is injected. In addition, the accurate optics model enables machine operators to predictably adjust key performance parameters, and allows reliable identification of new errors that occur during operation of the machine. Since the need for model calibration and beam control systems is common to all storage rings, software packages should be made that are portable between different machines. In this paper, we report on work directed toward achieving in-situ calibration of the optics model, detection of alignment errors, and orbit control techniques, with an emphasis on developing a portable system incorporating these tools.

关键词： Beam propagation method Error analysis Calibration Data modeling Systems modeling Control systems algorithm development Distortion Optical calibration Standards development

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SPOT STEREO MATCHING FOR DTM GENERATION

SPOT STEREO MATCHING FOR DTM GENERATION

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CONF ON INTEGRATING PHOTOGRAMMETRIC TECHNIQUES WITH SCENE ANALYSIS AND MACHINE VISION

作者： BALTSAVIAS, EP STALLMANN, D Swiss Federal Institute of Technology Zurich (Switzerland)

ISBN: (纸本)0819411809

This paper presents a matching algorithm for automatic DTM generation from SPOT images that provides dense, accurate and reliable results and attacks the problem of radiometric differences between the images. The proposed algorithm is based on a modified version of the Multiphoto Geometrically Constrained Matching (MPGC). It is the first algorithm that explicitly uses the SPOT geometry in matching, restricting thus the search space in one dimension, and simultaneously providing pixel and object coordinates. This leads to an increase in reliability, and to reduction and easier detection of blunders. The sensor modelling is based on Kratky's polynomial mapping functions to transform between the image spaces of stereopairs. With their help epipolar lines that are practically straight can be determined and the search is constrained along these lines. The polynomial functions can also provide approximate values, which are further refined by the use of an image pyramid.

关键词： algorithm development Clouds Sensors Agriculture Error analysis Linear filtering Reliability Statistical analysis Edge detection Modeling

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QUALITY AND PERFORMANCE ANALYSIS OF AUTOMATIC RELATIVE ORIENTATION

QUALITY AND PERFORMANCE ANALYSIS OF AUTOMATIC RELATIVE ORIEN...

引用

CONF ON INTEGRATING PHOTOGRAMMETRIC TECHNIQUES WITH SCENE ANALYSIS AND MACHINE VISION

作者： HAALA, B HAHN, M SCHMIDT, D Univ. Stuttgart (Germany)

ISBN: (纸本)0819411809

With this paper we continue work done in the area of automatic orientation of images. The term relative orientation usually is understood to be the task of estimating five rotational and translational parameters from a given set of homologous image points. With the attribute automatic we want to indicate that the parameter estimation is not the main task. The main task is that the stereo measurement process (i.e. establishing point correspondences) has to be done automatically. The presented procedure for automatic relative orientation of two images consists of modules for the computation of image pyramids, feature extraction, correspondence and the determination of orientation parameters. The procedure works in a hierarchical fashion, in which not more than some general a priori knowledge, e.g. that the images are taken at a standard image flight, is used. In this paper we describe the parallelization of the total procedure and the implementation on a SIMD computer system. A comparison to the sequential algorithms is given, discussing aspects mainly due to computational performance. Results concerning the quality are derived from experiments with two pairs of aerial images. Finally we show that with some modifications of the orientation procedure we arrive at a shape from stereo approach.

关键词： Computing systems Image processing Feature extraction algorithm development Digital imaging Software development algorithms Image filtering Image quality Image resolution

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ELECTRICAL-IMPEDANCE IMAGING FOR PREDICTION OF INTERFACIAL AREA DENSITY IN 2-PHASE FLOW

ELECTRICAL-IMPEDANCE IMAGING FOR PREDICTION OF INTERFACIAL A...

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2nd International Symposium on Measurement Technology and Intelligent Instruments

作者： JONES, OC KIYMIK, MK OZCALIK, HR LIN, JT ERIYES UNIV FAC ENGNDEPT ELECTR ENGNKAYSERI 38090TURKEY

Work described in this paper represents the progress toward the development of electrical impedance imaging (Eli) sometimes called electrical computed tomography (EICT) which may ultimately be utilized for nonintrusiv... 详细信息

ISBN: (纸本)0819413844

关键词： Chemical elements Finite element methods Electrodes Inverse problems Liquids algorithm development Light scattering Photography Ultrasonics Velocity measurements

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AFFINE-INVARIANT MOMENTS AND B-SPLINES FOR OBJECT RECOGNITION FROM IMAGE CURVES

AFFINE-INVARIANT MOMENTS AND B-SPLINES FOR OBJECT RECOGNITIO...

引用

CONF ON APPLICATIONS OF ARTIFICIAL INTELLIGENCE 1993 : MACHINE VISION AND ROBOTICS ( PREPRINTS )

作者： HUANG, ZH COHEN, FS Drexel Univ. (United States)

ISBN: (纸本)0819412007

In this paper we deal with the problem of matching and recognizing planar curves which are modeled as B-splines, independently of possible transformations that the original curve has been subjected to. Curve matching is achieved by using a finite set of B-spline moments which are compared to a set of B-spline prototype moments. When the observed curve is an unknown affine transformation (having four parameters) of one of the prototype curves, the affine parameters are estimated by relating the weighted moments of the original curve to that of the affine transformed curve. A set of up to a second order weighted B-spline moments are used toward that end, and results in a set of two single variable quadratic equations and two linear equations involving the four parameters of the linear transformation for which a closed form analytic expression exists. In the general linear case, the weight used is the affine length which weighs the moment integral by a kernel that results in having the affine parameters factoring out of the weighted moment integral. Once the transformation parameters are obtained, we undo the transformation, and use the set of third or fourth order B-spline moments for classification. The method is illustrated on classifying affine transformed silhouette of aircrafts.

关键词： Prototyping Error analysis Artificial intelligence Object recognition Data modeling Nonuniform sampling Affine motion model algorithm development Autoregressive models Control systems

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NEW METHOD OF EVALUATING FORM AND LOCATION ERROR - A METHOD OF PARAMETER SPACE SHRINKAGE

NEW METHOD OF EVALUATING FORM AND LOCATION ERROR - A METHOD ...

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2nd International Symposium on Measurement Technology and Intelligent Instruments

作者： CHE, RS CHEN, LY CHE, CJ HUANG, QC HARBIN INST TECHNOL DEPT PRECIS INSTRUMENTSHARBIN 150006PEOPLES R CHINA

ISBN: (纸本)0819413844

On the basis of surveying and comparing the evaluating algorithm of all kinds of geometric feature errors of form and location this paper develops a new minimal condition algorithm - parameter space shrink used in the CMM which achieves the calculation of the geometric feature ( space free line plane sphere cylinder cone surface circle ellipse curve ) form errors (straightness flatness roundness sphericity) location errors (parallelism perpendicularity angul arity symmetry concentricity position and runout). This algorithm is proved to be correct and superior after being tested and evaluated with material object standard and virtual volume.

关键词： Aerospace engineering Photonic integrated circuits Error analysis algorithm development Standards development Data conversion Data processing Software development Lithium Optical spheres

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KNOWLEDGE COMBINATION AND DECISION algorithmS FOR EXPERT-SYSTEMS BASED ON FUZZY-LOGIC

KNOWLEDGE COMBINATION AND DECISION ALGORITHMS FOR EXPERT-SYS...

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Conference on Applications of Fuzzy Logic Technology

作者： DEMATHELIN, M PERNEEL, C CARNEGIE MELLON UNIV DEPT ELECT & COMP ENGNAUTOMATED SYST & INFORMAT PROC LABPITTSBURGHPA 15213

ISBN: (纸本)0819413267

In this paper, fuzzy logic is used to derive knowledge combination rules for heuristic search algorithms. These algorithms are especially designed for expert systems addressing complex problems whose solution space is too large to be fully explored. Search algorithms using heuristic knowledge can reduce the exploration of the solution space while preserving the quality of the proposed solutions.

关键词： Fuzzy logic Chemical elements Computing systems Fuzzy systems Lithium Fourier transforms algorithm development Complex systems Data processing Roentgenium

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DIGITAL TRACKING AND CONTROL OF RETINAL IMAGES 3

DIGITAL TRACKING AND CONTROL OF RETINAL IMAGES

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CONF ON OPHTHALMIC TECHNOLOGIES 3

作者： BARRETT, SF JERATH, MR RYLANDER, HG WELCH, AJ Univ. of Texas/Austin (United States) Wellman Labs. of Photomedicine (United States)

ISBN: (纸本)0819411043

Laser induced retinal lesions are used to treat a variety of eye diseases such as diabetic retinopathy and retinal detachment. An instrumentation system has been developed to track a specific lesion coordinate on the retinal surface and provide corrective signals to maintain laser position on the coordinate. High resolution retinal images are acquired via a CCD camera coupled to a fundus camera and video frame grabber. Optical filtering and histogram modification are used to enhance the retinal vessel network against the lighter retinal background. Six distinct retinal landmarks are tracked on the high contrast image obtained from the frame grabber using two-dimensional blood vessel templates. The frame grabber is hosted on a 486 PC. The PC performs correction signal calculations using an exhaustive search on selected image portions. An X and Y laser correction signal is derived from the landmark tracking information and provided to a pair of galvanometer steered mirrors via a data acquisition and control subsystem. This subsystem also responds to patient inputs and the system monitoring lesion growth. This paper begins with an overview of the robotic laser system design followed by implementation and testing of a development system for proof of concept. The paper concludes with specifications for a real time system.

关键词： Detection and tracking algorithms Retina Cameras Eye Frame grabbers Video algorithm development Laser systems engineering Prototyping Mirrors

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ASSUMPTION TRUTH MAINTENANCE SYSTEM FOR AUTOMATIC TARGET RECOGNIZER EVALUATION

ASSUMPTION TRUTH MAINTENANCE SYSTEM FOR AUTOMATIC TARGET REC...

引用

CONF ON ARCHITECTURE, HARDWARE, AND FORWARD-LOOKING INFRARED ISSUES IN AUTOMATIC TARGET RECOGNITION

作者： JOHNSON, R BUENAFE, M BENNETT, L HUDSON, C OR Concepts Applied (United States) U.S. Army Research Lab. (United States) Expersoft (United States)

ISBN: (纸本)0819411930

This paper describes an approach for employing an Assumption Truth Maintenance System (ATMS) to support a tri-service algorithm development environment. A truth maintenance system provides a mechanism for tracking assumptions and logical propositions, and recognizing contradictions. The higher order logic embodied by the truth maintenance system adds value and functionality to the tool set for applications programming. The first section of this paper describes an implementation of an ATMS in the Army's MAXIMIZE (matrix for algorithm exploration, optimization and evaluation) system. The latter part of the paper describes preliminary results of an integrated truth maintenance system to assist image understanding.

关键词： Detection and tracking algorithms Image segmentation algorithm development Automatic target recognition Logic Interfaces Pattern recognition Sensors Target recognition Thulium

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BUILDING GLOBAL SURFACE MODELS BY PURPOSIVE AND QUALITATIVE VIEWPOINT ADJUSTMENT 6

BUILDING GLOBAL SURFACE MODELS BY PURPOSIVE AND QUALITATIVE ...

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CONF ON SENSOR FUSION 6

作者： KUTULAKOS, KN SEALES, WB DYER, CR Univ. of Wisconsin/Madison (United States) Univ. of Kentucky (United States)

ISBN: (纸本)0819413240

We present an approach for recovering a global surface model of an object from the deformation of the occluding contour using an active (i.e., mobile) observer able to control its motion. In particular, we consider two problems: (1) How can the observer's viewpoint be controlled in order to generate a dense sequence of images that allows incremental reconstruction of an unknown surface? And (2) how can we construct a global surface model from the generated image sequence? We achieve the first goal by purposefully and qualitatively controlling the observer's instantaneous direction of motion in order to control the motion of the visible rim over the surface. We achieve the second goal by using a stationary calibrated trinocular camera rig and a mechanism for controlling the relative position and orientation of the viewed surface with respect to the trinocular rig. Unlike previous shape-from-motion approaches which derive quantitative shape information from an arbitrarily generated sequence of images, we develop a collection of simple and efficient viewing strategies that allow the observer to achieve the global reconstruction goal by maintaining specific geometric relationships with the viewed surface. These relationships depend only on tangent computations on the occluding contour. To demonstrate the feasibility and effectiveness of our approach we apply the developed algorithms to synthetic and real scenes.

关键词： Cameras Sensor fusion Calibration Motion models Image fusion Motion controllers Optical spheres algorithm development Edge detection Reconstruction algorithms

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