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检索条件"主题词=Algorithm Development"

共 1737 条记录，以下是1451-1460 订阅

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CLASSIFICATION OF DUCTAL CARCINOMA IN-SITU BY IMAGE-ANALYSIS OF CALCIFICATIONS FROM MAMMOGRAMS

CLASSIFICATION OF DUCTAL CARCINOMA IN-SITU BY IMAGE-ANALYSIS...

引用

CONF ON BIOMEDICAL IMAGE PROCESSING AND BIOMEDICAL VISUALIZATION

作者： PARKER, J DANCE, DR DAVIES, DH YEOMAN, LJ MICHELL, MJ HUMPHREYS, S Institute of Cancer Research and Royal Marsden Hospital (United Kingdom) King's College Hospital (United Kingdom)

ISBN: (纸本)0819411388

Image analysis methods have been developed to characterize calcifications associated with Ductal Carcinoma in-Situ (DCIS), and to differentiate between those having comedo or non- comedo histology. Cases were selected from the U.K. breast screening program, and in each case the histology and a magnified mammographic view were obtained. The films were digitized at 25 micron sampling size and 8 bit grey level resolution. Calcifications were manually segmented from the normal breast background, and a radiologist, experienced in breast screening, checked the labelling of a calcifications. An algorithm was developed to classify firstly the individual objects within a film, and secondly the film itself. The algorithm automatically selected the combination of features giving the least estimated Bayes error for a set of object-oriented features evaluated for each calcification. The k-nearest neighbors statistical approach was then used to classify individual objects giving a ratio of comedo to non-comedo objects for a set of training films. Films were classified by applying a threshold to this ratio. In the classification of typical comedo from typical non-comedo the success rate of the algorithm was 100% for a training set of 4 cases and test set of 16 cases.

关键词： Breast Mammography Image analysis algorithm development Error analysis Image classification Image segmentation Pathology Cancer Tissues

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REAL-TIME VIDEO EDGE TRACKING algorithmS 7

REAL-TIME VIDEO EDGE TRACKING ALGORITHMS

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7th Conference on Acquisition, Tracking, and Pointing

作者： HILL, PD WALSH, TR Air Force Phillips Lab. (United States) Applied Technology Associates Inc. (United States)

ISBN: (纸本)0819411868

This paper describes tree real-time video edge tracking algorithms for use in tracking targets such as boosting-rockets and satellites. These algorithms are referred to as the Maximum intercept method. Single modified-Hough transform method, and the Double modified-Hough transform method. These algorithms assume knowledge of the angle associated with the edge that you wish to track. Two methods of obtaining the best edge angle from which to track are presented. These edge tracking algorithms and edge- angle determination methods evolved throughout the development of the Advanced Modular Tracker (AMT). The AMT is a real-time video tracker with sophisticated mode logic and is described in another paper. The AMT will be the primary tracker for the High Altitude Balloon Experiment (HABE) being performed by the USAF Phillips Laboratory for the Strategic Defense Initiative Organization (SDIO).

关键词： Detection and tracking algorithms Video Rockets Space telescopes Telescopes algorithm development Cameras Satellites Sensors Staring arrays

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CLOSED-LOOP LABELING AND TRACKING USING AREA PARAMETER TECHNOLOGIES 7

CLOSED-LOOP LABELING AND TRACKING USING AREA PARAMETER TECHN...

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7th Conference on Acquisition, Tracking, and Pointing

作者： SEITZLER, T Perceptive Machines (United States)

ISBN: (纸本)0819411868

The potential applications for machine vision are increasing faster than the costs are decreasing. The ability to follow moving objects is a key to machine vision and is the foundation to tracking. The principles of inspection or machine control are essentially unchanged, but the temporal environment introduces increased memory and bandwidth requirements for host processors, and increased performance requirements for the feature extraction processors. Recent developments in hardware are allowing more robust tracking systems at increasingly affordable prices. We'll explore these topics are greater length in the text which follows.

关键词： Detection and tracking algorithms Machine vision Information operations Feature extraction Inspection Agriculture algorithm development Light sources and illumination Robot vision Target acquisition

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GENERATING OBJECT LOCATORS FROM A TRAINING ENSEMBLE 2

GENERATING OBJECT LOCATORS FROM A TRAINING ENSEMBLE

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2ND INTERNATIONAL CONF ON ADAPTIVE LEARNING SYSTEMS

作者： SHER, DB PODNOS, EH SUNY/Buffalo (United States)

ISBN: (纸本)0819411981

We discuss and present preliminary results about an algorithm which is trained to locate objects in images. The algorithm determines the parameters for a generalized Hough transform based on training images. Our training images consist of binary edge images from noisy imagery and identified points and boundaries for the objects being located in this imagery. The resulting generalized Hough transform will find objects of the same type at a wide variety of scales and any orientation present in the training data.

关键词： Hough transforms Binary data algorithm development Detection and tracking algorithms Neural networks Data modeling Object recognition Sensors Visualization Computer science

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MULTISCALE ISOTROPIC MORPHOLOGY AND SHAPE APPROXIMATION USING THE VORONOI DIAGRAM

MULTISCALE ISOTROPIC MORPHOLOGY AND SHAPE APPROXIMATION USIN...

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CONF ON VISION GEOMETRY

作者： BRANDT, JW Univ. of California/Davis (United States)

ISBN: (纸本)0819410330

The Voronoi diagram of a sample set obtained from a shape boundary can be analyzed to perform morphological erosions, dilations, openings, and closings of the shape with a scaled unit disk as the structuring element. These operations collectively comprise isotropic morphology--meaning the fundamental morphological operations with a parameterized disk operator. The isotropic morphology operations are the basis of multi-scale morphological shape analysis. For instance, features obtained from a series of openings and closings by disks of varying size can be used to characterize a shape over a range of scales. In general, the isotropic morphology operations are a significant class of operations with broad potential applications. The new, Voronoi-diagram-based isotropic morphology algorithm has four significant advantages over existing algorithms: (1) the Voronoi diagram need only be computed once, and then an entire series of scale-based analyses can be performed at low incremental cost; (2) the time/space complexity of the algorithm is independent of the disk radius and depends only on the number of boundary samples; (3) the scale parameter (disk radius) can assume non-integral values; (4) the implied metric is the Euclidean metric, rather than an approximation thereof.

关键词： Shape analysis Vision geometry algorithm development Statistical analysis Image processing Visualization Digital imaging Edge detection Spatial frequencies Visual system

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CALIBRATION OF THE VISIBLE AND NEAR-INFRARED CHANNELS OF THE ADVANCED VERY HIGH-RESOLUTION RADIOMETER (AVHRR) AFTER LAUNCH

CALIBRATION OF THE VISIBLE AND NEAR-INFRARED CHANNELS OF THE...

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Conference on Recent Advances in Sensors, Radiometric Calibration, and Processing of Remotely Sensed Data

作者： RAO, CRN CHEN, JH NOAA NATL ENVIRONM SATELLITE DATA & INFORMAT SERVSATELLITE RES LABWASHINGTONDC 20233

ISBN: (纸本)0819411744

The relative degradation in time of the visible(channel 1: 0.58-0.68jim) and nearinfrared(channel 2: ***) channels of the Advanced Very High Resolution Radiometer(AVHRR), onboard the NOAA polar-orbiting operational environmental satellites(POES), has been determined, *** the southeastern Libyan desert(21-23°N latitude; 2829° E longitude) as a time-invariant calibration target. A statistical procedure was used on the reflectance data for the two channels from the B3 data of the International Satellite Cloud Climatology Project(ISCCP) to obtain the degradation rates for the AVHRRs on NOAA-7, -9, and -11 spacecraft. The degradation rates per year for channels 1 and 2 are respectively: 3.6% and 4.3%(NOAA-7); 5.9% and 3.5%(NOAA-9); and 1.2% and 2.0%(NOAA-11). The use of the degradation rates thus determined, in conjunction with t1absolute" calibrations obtained from congruent aircraft and satellite measurements, in the development of correction algorithms is illustrated with the AVHRR on the NOAA-9 spacecraft.

关键词： Calibration Radiometry Satellites algorithm development Space operations Climatology Clouds Reflectivity

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Detecting L-, T-, and X-junctions from low-order image derivatives

Detecting L-, T-, and X-junctions from low-order image deriv...

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Visual Communications and Image Processing 1993

作者： Iso, Toshiki Shizawa, Masahiko ATR Human Information Processing Laboratories 2-2 Hikaridai Seika-cho Soraku-gun Kyoto 619-02 Japan

The proposed one-shot algorithm requires only first- and second-order image derivatives in local neighborhoods to detect multiple orientations and to classify L-, T-, X-junctions. This algorithm has two stages. The first stage detects multiple orientations with a parametrized filter based on the principle of superposition, and the second stage classifies L-, T-, X-junctions with first-order image derivatives in local areas in order to evaluate the borders. The computational cost is therefore low, and the method is robust against noise. The algorithm provided successful results for artificial images and real images.

关键词： Computer vision technology Superposition algorithm development Image analysis Image classification Data processing Edge detection Image filtering Information fusion Visualization

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TESTING ASPHERICAL SURFACES USING MULTIPLE ANNULAR INTERFEROGRAMS

TESTING ASPHERICAL SURFACES USING MULTIPLE ANNULAR INTERFERO...

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CONF ON SPECIFICATION AND MEASUREMENT OF OPTICAL SYSTEMS

作者： MELOZZI, M PEZZATI, L MAZZONI, A Officine Galileo SpA (Italy)

ISBN: (纸本)081940960X

We present a technique for interferometrically testing aspherical surfaces without the use of compensating elements. The method consists of recording successive overlapping phase maps from a set of annular interferograms of an aspherical surface, obtained using a conventional phase-shifting interferometer and a micropositioning translator stage. These maps are then sewn together with a suitable algorithm we have developed, and the whole surface error is recovered. Experimental results are shown to be in good agreement with the null lens test performed for comparison.

关键词： Aspheric lenses Interferometers Interferometry Optical testing Optical spheres algorithm development Phase shifts Zernike polynomials Spatial frequencies Superposition

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AUTOMATED REPRESENTATION CHANGING FOR PROBLEM-SOLVING AND ELECTRONIC CAD

AUTOMATED REPRESENTATION CHANGING FOR PROBLEM-SOLVING AND EL...

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CONF ON THE APPLICATIONS OF ARTIFICIAL INTELLIGENCE 1993 : KNOWLEDGE-BASED SYSTEMS IN AEROSPACE AND INDUSTRY ( PREPRINTS )

作者： ZIMMER, R MACDONALD, A HOLTE, R Brunel Univ. (United Kingdom) Univ. of Ottawa (Canada)

ISBN: (纸本)081941199X

Structured top-down design can be viewed as a process of iterative step-wise representation changes wherein an initial specification passes through several levels of increasingly concrete representations. When viewed this way, many of the goals and difficulties of hardware CAD are strikingly similar to those addressed by the branch of AI problem solving known as `Problem Reformulation.' Our principal aim is to provide a common mathematical setting to the two disciplines and then to exploit problem reformulation results in the design and implementation of a CAD system that can reason about VLSI design as representational change. The CAD system builds on one that has a proof assistant at its core, so that circuits designed in the system are pre-verified. High-level design knowledge is captured by algebraic models; refinement transformations between levels and optimizing and partitioning functions within a level are algebraic homomorphisms. The use of algebra throughout allows us to add different kinds and levels of reasoning to the theorem prover without a loss of mathematical soundness. The formalization of the `design as representation change' idea involves bringing together various strands in abstract algebra, artificial intelligence, and formal methods for system design. In this paper we describe the algebraic background and give examples and results of this kind of analysis in artificial intelligence and multi-layered hardware description.

关键词： Computer aided design Artificial intelligence Evolutionary algorithms CAD systems Mathematical modeling Mathematics Solid modeling algorithm development Computer simulations Space operations

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USING OPTICAL-FLOW TECHNIQUES TO ELECTRONICALLY STABILIZE SCENE MOTION

USING OPTICAL-FLOW TECHNIQUES TO ELECTRONICALLY STABILIZE SC...

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

作者： SEBOK, DR SEBOK, TJ Loral Defense Systems (United States)

ISBN: (纸本)0819411930

A major consideration in designing imaging systems that will be placed on moving platforms is the stability of the image. For example, the tracking or cuing of small objects requires a very steady image sequence. To provide the necessary stabilized platform typically requires the use of an inertial stabilized gimbaling system. Such gimbaling systems are both expensive and bulky. These factors are becoming increasingly important to the military community. The cost of a gimbal system can preclude its use on disposable ordinance systems and can be a significant portion of the cost of such systems. A low cost and low bulk alternative is needed. This paper describes a method for performing electronic stabilization using optical flow techniques. Electronic stabilization allows either the elimination of the inertial stabilized platform or the use of a low cost gimbal. The operating scenario available to electronic stabilization is examined and the resulting basic system requirements are derived. A model- based approach for deciding sensor motion is described. The utilization of the motion information for performing motion compensation is presented. Finally, preliminary results are given.

关键词： Sensors Optical flow Image sensors Motion models Cameras algorithm development Motion estimation Data modeling Target detection Video

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