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检索条件"主题词=Algorithm development"

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VALIDATION OF INFRARED CLOUD DETECTION algorithmS DEVELOPED FOR TACNEPH

VALIDATION OF INFRARED CLOUD DETECTION ALGORITHMS DEVELOPED ...

引用

CONF ON PASSIVE INFRARED REMOTE SENSING OF CLOUDS AND THE ATMOSPHERE

作者： GUSTAFSON, GB ISAACS, RG SPARROW, JM Atmospheric and Environmental Research Inc. (United States) Air Force Phillips Lab. (United States)

ISBN: (纸本)0819411701

A multi-year research and development program is underway to develop an automated cloud model known as TACNEPH for use by the Air Force at tactical sites. Significant features of this model include the ability to analyze real-time DMSP/OLS and NOAA/AVHRR data using only the limited resources of transportable tactical ground stations and to automatically adapt to changes in the available data mix. No supporting data from a center are available (e.g., upper air temperature and moisture fields, surface reports). To satisfy these requirements it was necessary to develop separate algorithms for each sensor platform. An infrared algorithm developed for DMSP data relies on an estimate of the clear scene radiative brightness temperature based on a dynamic correction to a surface temperature climatology. A separate NOAA IR algorithm is an adaptation of the multispectral approach of Saunders and Kriebel. Both algorithms are designed to improve cloud detection capabilities over the current Air Force operational RTNEPH model, with particular emphasis on low cloud. A major aspect of the TACNEPH development program is the validation of the cloud algorithms over globally varying conditions. Since there is no universally accepted source of ground truth data for cloud, it was necessary to develop a validation procedure based on available data sources. algorithm validation is based on subjective man/computer analysis of the input satellite sensor data using any available additional data sources as guidance.

关键词： Clouds algorithm development Satellites Sensors Data modeling Detection and tracking algorithms Infrared radiation Statistical analysis Analytical research Climatology

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STAR FIELD IDENTIFICATION algorithm - PERFORMANCE VERIFICATION USING SIMULATED STAR FIELDS

STAR FIELD IDENTIFICATION ALGORITHM - PERFORMANCE VERIFICATI...

引用

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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REGISTRATION OF TRANSPORTATION DAMAGES USING A HIGH-RESOLUTION CCD CAMERA

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

引用

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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ADAPTIVE THRESHOLDING THROUGH MORPHOLOGICAL FILTERING 4

ADAPTIVE THRESHOLDING THROUGH MORPHOLOGICAL FILTERING

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4TH CONF ON NONLINEAR IMAGE PROCESSING

作者： ZHAO, DM Univ. of Michigan/Dearborn (United States)

ISBN: (纸本)0819411353

Morphological filtering is known for its flexibility in locally modifying geometrical features of three dimensional data, or image functions. The topic in this paper is on adaptive thresholding of multilevel image functions to extract application-specific features from grayscale images. By adaptive thresholding, we mean that the process of binarizing grayscale images is locally adjusted. The geometric features to be extracted are furnished by specifics from the application requirements, e.g., a binary version is needed from a photo to extract letters from a car license plate such that the binarized image is specifically representing the information about letters around the license plate while ignoring other background information. A contour function is used as the adaptive thresholding layer for the grayscale image. After the first thresholding, a binarized version is obtained and then local geometric parameters about the binary image are measured through a skeletonization process. The parameters from skeletonization are compared with the feature descriptions and a contour function is redefined and used for adaptively thresholding the grayscale image. A skeletonization process is then applied to the binarized image to extract local geometric parameters to meet the application- specific requirement. Application of the developed adaptive thresholding algorithm includes examples in text image binarization, object feature binarization against surrounding background, and glass flaw detection.

关键词： Image processing Binary data Frequency shift keying Feature extraction Nonlinear image processing Image filtering 3D image processing Digital filtering algorithm development Glasses

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NOVEL CURVE-FITTING TECHNIQUE FOR CHARACTERIZATION OF HIGH-RESISTIVITY SEMICONDUCTOR-MATERIALS 3

NOVEL CURVE-FITTING TECHNIQUE FOR CHARACTERIZATION OF HIGH-R...

引用

3RD CONF ON OPTICALLY ACTIVATED SWITCHING

作者： PANIGRAHI, S LAKDAWALA, VK THOMAS, LM BRINKMANN, RP Old Dominion Univ. (United States) Siemens AG (Germany)

ISBN: (纸本)0819411000

A novel technique for deep level characterization of high-resistivity semiconductor materials, mainly GaAs has been developed. The technique analyzes the current transients generated by photo induced current transient spectroscopy (PICTS) using a digital data acquisition approach. It is observed that by using the curve fitting technique closely spaced traps within the bandgap could be separately identified and characterized. In addition, the multiple decay time constants obtained from curve fitting consists of sum of exponentials throughout the temperature range centered around a peak obtained from the PICTS spectrum. Each decay time constant (mode) around the specified temperature range represents a trap energy level present in the sample. Since the decay time constants are obtained directly from the transients, trap parameters calculated employing the curve fitting method are more accurate and reliable than those obtained from the two-gated rate window method. The method has been used to characterize high-resistivity materials of interest to optically activated switches and a comparative analysis is reported.

关键词： Gallium arsenide Temperature metrology Semiconductor materials Switching Switches algorithm development Analytical research Chromium Data acquisition Statistical analysis

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SIGNAL-ADAPTIVE DECOMPOSITION OF MULTICOMPONENT SIGNALS 4

SIGNAL-ADAPTIVE DECOMPOSITION OF MULTICOMPONENT SIGNALS

引用

4TH CONF ON ADVANCED SIGNAL PROCESSING algorithmS, ARCHITECTURES, AND IMPLEMENTATIONS

作者： ASSALEH, KT MAMMONE, RJ Rutgers Univ. (United States)

ISBN: (纸本)0819412767

In this paper we present a new method for adaptively decomposing a multicomponent signal into its components. This method is based on fitting an autoregressive (AR) model to the short-time spectra of the signal. The AR parameters represent the coefficients of the linear predictive (LP) polynomial. The roots of this polynomial constitute a set of center frequencies and bandwidths that characterize the modes of the signal. The decomposition process is achieved by applying a time-varying filter bank to the original multicomponent signal. The characteristics of this filter bank are derived from a subset of the roots of the LP polynomial. We have developed a constraining algorithm to determine that subset based on the boundedness of the bandwidths, and the temporal continuity of the center frequencies of the components. We have applied the proposed decomposition method for the separation of the formants of speech signals.

关键词： Autoregressive models Signal to noise ratio Electronic filtering Composites Digital filtering algorithm development Signal processing Image segmentation Resonators Time-frequency analysis

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TRANSMISSION ERROR-DETECTION, RESYNCHRONIZATION, AND ERROR CONCEALMENT FOR MPEG VIDEO DECODER

TRANSMISSION ERROR-DETECTION, RESYNCHRONIZATION, AND ERROR C...

引用

Meeting on Visual Communications and Image Communication 93

作者： LEE, SH YOUN, JS JANG, SH JANG, SH KOREA TELECOM SYST DEV CTR SEOULSOUTH KOREA

ISBN: (纸本)0819413690

In this paper, we propose an error detection and a resynchronization algorithm in the decoding process of VLC and an error concealment technique for MPEG video decoder. A transmission error causes an error propagation in compressed video data, which in turn leads to objectionable degradation in picture quality. In order to minimize the effect of error propagation, we should resynchronize and recover the differentially coded symbols as fast as possible. The proposed algorithm is capable of resynchronizing the VLC until at least the next macroblock. Concerning the error concealment algorithm, more emphasis is laid upon the concealment of erroneous intra mode MBs. The proposed technique shows better performance than any other previous techniques especially in I-pictures and scene change pictures.

关键词： Error analysis Video Video compression Video processing algorithm development Data communications Detection and tracking algorithms Visualization Computer programming Video coding

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DYNAMIC SENSOR-BASED FAULT-DETECTION FOR ROBOTS

DYNAMIC SENSOR-BASED FAULT-DETECTION FOR ROBOTS

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1993 SPIE Technical Conference on Telemanipulator Technology and Space Telerobotics

作者： VISINSKY, ML CAVALLARO, JR WALKER, ID RICE UNIV DEPT ELECT & COMP ENGNHOUSTONTX 77251

ISBN: (纸本)0819413224

Fault detection and fault tolerance are increasingly important for robots in space or hazardous environments due to the dangerous and often inaccessible nature of these environs. We have previously developed algorithms to enable robots to autonomously cope with failures of critical sensors and motors. Typically, the detection thresholds used in such algorithms to mask out model and sensor errors are empirically determined and are based on a specific robot trajectory. We have noted, however, that the effect of model and sensor inaccuracy fluctuates dynamically as the robot moves and as failures occur. The thresholds, therefore, need to be more dynamic and respond to the changes in the robot system so as to maintain an optimal bound for sensing real failures in the system versus misalignment due to modeling errors. In this paper, we analyze the reachable measurement intervals method of computing dynamic thresholds and explore its applicability to robotic fault detection.

关键词： Robots Sensors algorithm development Robotics Computer programming Matrices Robotic systems Motion models Systems modeling Detection and tracking algorithms

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