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检索条件"主题词=Algorithm development"

共 1737 条记录，以下是621-630 订阅

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EXPERIMENTAL-VERIFICATION OF AUTONOMOUS STAR FIELD IDENTIFICATION algorithm

EXPERIMENTAL-VERIFICATION OF AUTONOMOUS STAR FIELD IDENTIFIC...

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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 for autonomous navigation. The minimum identifiable star pattern element consists of an ordered star triplet defined by three stars and their celestial coordinates (right ascension and declination). The star field identification algorithm was integrated with the CCD-based star tracker and tested at the Table Mountain Observatory. Real-time star field identification is reported with a CCD-based imaging camera interfaced to SPARC II workstation.

关键词： Stars Charge-coupled devices Detection and tracking algorithms Observatories Cameras CCD cameras Space telescopes Telescopes algorithm development Visualization

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Simplified correction of B₁ inhomogeneity for chemical exchange saturation transfer (CEST) MRI measurement with surface transceiver coil

Simplified correction of B<sub>1</sub> inhomogeneity for che...

引用

Conference on Medical Imaging - Biomedical Applications in Molecular, Structural, and Functional Imaging

作者： Sun, Phillip Zhe Zhou, Iris Yuewen Igarashi, Takahiro Guo, Yingkun Xiao, Gang Wu, Renhua Massachusetts Gen Hosp Athinoula A Martinos Ctr Biomed Imaging Dept Radiol Charlestown MA 02129 USA Harvard Univ Sch Med Charlestown MA USA Sichuan Univ West China Univ Hosp 2 Dept Radiol Chengdu 610064 Peoples R China Shantou Univ Affiliated Hosp 2 Coll Med Dept Radiol Shantou Guangdong Peoples R China

ISBN: (纸本)9781628415070

Chemical exchange saturation transfer (CEST) MRI is sensitive to dilute exchangeable protons and local properties such as pH and temperate, yet its susceptibility to field inhomogeneity limits its in vivo applications. Particularly, CEST measurement varies with RF irradiation power, the dependence of which is complex due to concomitant direct RF saturation (RF spillover) effect. Because the volume transmitters provide relatively homogeneous RF field, they have been conventionally used for CEST imaging despite of their elevated specific absorption rate (SAR) and relatively low sensitivity than surface coils. To address this limitation, we developed an efficient B-1 inhomogeneity correction algorithm that enables CEST MRI using surface transceiver coils. This is built on recent work that showed the inverse CEST asymmetry analysis (CESTRind) is not susceptible to confounding RF spillover effect. We here postulated that the linear relationship between RF power level and CESTRind can be extended for correcting B-1 inhomogeneity induced CEST MRI artifacts. Briefly, we prepared a tissue-like Creatine gel pH phantom and collected multi-parametric MRI including relaxation, field map and CEST MRI under multiple RF power levels, using a conventional surface transceiver coil. The raw CEST images showed substantial heterogeneity due to B-1 inhomogeneity, with pH contrast to noise ratio (CNR) being 8.8. In comparison, pH MRI CNR of the field-inhomogeneity corrected CEST MRI was found to be 17.2, substantially higher than that without correction. To summarize, our study validated an efficient field inhomogeneity correction that enables sensitive CEST MRI with surface transceiver, promising for in vivo translation.

关键词： Magnetic resonance imaging Transceivers In vivo imaging algorithm development Absorption Radiology Synthetic aperture radar Transmitters Biomedical optics Tissues

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FOURIER-TRANSFORM INFRARED (FTIR) DETERMINATION OF INTERSTITIAL OXYGEN CONCENTRATION OF SINGLE-SIDE-POLISHED SILICON-WAFERS

FOURIER-TRANSFORM INFRARED (FTIR) DETERMINATION OF INTERSTIT...

引用

7TH INTERNATIONAL CONF ON FOURIER TRANSFORM SPECTROSCOPY

作者： RENNEX, B National Institute of Standards and Technology (United States)

ISBN: (纸本)0819401811

This paper evaluates a new algorithm developed by the author for calculating interstitial oxygen concentration in silicon wafers, using infrared transmission data. These silicon wafers have an unpolished side and are referred to as being single-side-polished (SSP). This evaluation is carried out for various "unpolished" surface types, which are representative of etched or backside-damaged surfaces used by the integrated circuit industry. In general, accurate measurement of oxygen content is necessary for improvement of quality control in the manufacture of integrated circuits, and this quality control is more reliable and less costly if this measurement can be done on SSP wafers.

关键词： Oxygen Semiconducting wafers Silicon Digital signal processing FT-IR spectroscopy Absorption algorithm development Control systems Integrated circuits Standards development

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COMPARISON OF POINT-SOURCE algorithmS FOR OPTIMUM ACQUISITION RANGE OF ELECTROOPTICAL SENSOR

COMPARISON OF POINT-SOURCE ALGORITHMS FOR OPTIMUM ACQUISITIO...

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Conference on Signal and Data Processing of Small Targets 1994

作者： JHA, US ROCKWELL INT CORP DIV AUTONET ELECTR SYSTANAHEIMCA 92803

ISBN: (纸本)0819415391

This paper examines a special class of signal processing technique called Minimum Variance Deconvolution (MVD) method and compares it with the commonly used Matched filtering and Wiener filtering based deconvolution processing in point source acquisition signal processing applications for Electro-Optical sensors. A step by step development of the batch and recursive MVD algorithm including comparison with the competing methods are presented in this paper.

关键词： Filtering (signal processing) Electronic filtering Signal to noise ratio Signal processing Deconvolution Digital filtering Electro optical sensors algorithm development Electro optical modeling Error analysis

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Road detection and tracking for autonomous mobile robots

Road detection and tracking for autonomous mobile robots

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Conference on Unmanned Ground Vehicle Technology IV

作者： Hong, TH Rasmussen, C Chang, T Shneier, M Natl Inst Stand & Technol Intelligent Syst Div Gaithersburg MD 20899 USA

ISBN: (纸本)0819444650

As part of the Army's Demo III project, a sensor-based system has been developed to identify roads and to enable a mobile robot to drive along them. A ladar sensor, which produces range images, and a color camera are used in conjunction to locate the road surface and its boundaries. Sensing is used to constantly update an internal world model of the road surface. The world model is used to predict the future position of the road and to focus the attention of the sensors on the relevant regions in their respective images. The world model also determines the most suitable algorithm for locating and tracking road features in the images based on the current task and sensing information. The planner uses information from the world model to determine the best path for the vehicle along the road. Several different algorithms have been developed and tested on a diverse set of road sequences. The road types include some paved roads with lanes, but most of the sequences are of unpaved roads, including dirt and gravel roads. The algorithms compute various features of the road images including smoothness in the world model map and in the range domain, and color features and texture in the color domain. Performance in road detection and tracking are described and examples are shown of the system in action.

关键词： Roads Sensors LIDAR Detection and tracking algorithms Cameras Image segmentation Data modeling Sensory processes Mobile robots algorithm development

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Implementation of a real-time software-only image smoothing filter for a block-transform video codec

Implementation of a real-time software-only image smoothing ...

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Conference on Image and Video Communications and Processing

作者： Miaw, WF Rowe, LA Univ Calif Berkeley Div Comp Sci EECS Berkeley CA 94720 USA

ISBN: (纸本)0819448222

The JPEG compression standard is a popular image format. However, at high compression ratios JPEG compression, which uses block-transform coding, can produce blocking artifacts, or artificially introduced edges within the image. Several post-processing algorithms have been developed to remove these artifacts. This paper describes an implementation of a post-processing algorithm developed by Ramchandran, Chou, and Crouse (RCC) which is fast enough for real-time software-only video applications. The original implementation of the RCC algorithm involved calculating thresholds to identify artificial edges. These calculations proved too expensive for use in real-time software-only applications. We replaced these calculations with a linear scale approximating ideal threshold values based on a combination of peak signal-to-noise ratio calculations and subjective visual quality. The resulting filter implementation is available in the widely-deployed Open Mash streaming media toolkit.

关键词： Image filtering Image quality Video Image compression Smoothing Video compression Visualization algorithm development Quantization Image transmission

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MORPHOLOGICAL EDGE-DETECTION FOR OCEANOGRAPHIC IMAGES 22

MORPHOLOGICAL EDGE-DETECTION FOR OCEANOGRAPHIC IMAGES

引用

22nd AIPR Workshop on interdisciplinary Computer Vision: Applications and Changing Needs

作者： KRISHNAMURTHY, S IYENGAR, SS HOLYER, R LYBANON, M LOUISIANA STATE UNIV DEPT COMP SCIBATON ROUGELA 70803

ISBN: (纸本)0819413909

Mesoscale oceanographic features are important aspects of ocean circulation. The high volume of satellite-derived oceanographic data coupled with the high level of human skill associated with the detection of oceanographic features in the data has necessitated automating the interpretation process. Morphological edge detectors produce better results than the conventional template- and differentiation-based edge detectors. A grayscale morphological edge-detection algorithms is developed for automatic delineation of mesoscale structure in digital satellite IR images of the ocean. We compare performances of three morphological edge detectors in sea surface temperature fields. We provide experimental results on images from the North Atlantic under various image settings.

关键词： Sensors Mathematical morphology Satellites algorithm development Earth observing sensors Edge detection Infrared imaging Satellite imaging Detection and tracking algorithms Image processing

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Hyperspectral Imaging for Melanoma Screening

Hyperspectral Imaging for Melanoma Screening

引用

Conference on Photonic Therapeutics and Diagnostics X

作者： Martin, Justin Krueger, James Gareau, Daniel Rockefeller Univ Lab Invest Dermatol New York NY 10065 USA

ISBN: (纸本)9780819498397

The 5-year survival rate for patients diagnosed with Melanoma, a deadly form of skin cancer, in its latest stages is about 15%, compared to over 90% for early detection and treatment. We present an imaging system and algorithm that can be used to automatically generate a melanoma risk score to aid clinicians in the early identification of this form of skin cancer. Our system images the patient's skin at a series of different wavelengths and then analyzes several key dermoscopic features to generate this risk score. We have found that shorter wavelengths of light are sensitive to information in the superficial areas of the skin while longer wavelengths can be used to gather information at greater depths. This accompanying diagnostic computer algorithm has demonstrated much higher sensitivity and specificity than the currently commercialized system in preliminary trials and has the potential to improve the early detection of melanoma.

关键词： Melanoma Diagnostics Imaging systems Cameras Computer aided design Evolutionary algorithms RGB color model Skin algorithm development Skin cancer

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Tensorial generalization of a phenomenological material law for shape memory alloys

Tensorial generalization of a phenomenological material law ...

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International Workshop on Nondestructive Testing and Computer Simulations in Science and Engineering

作者： Terriault, P Trochu, F Brailovski, V Ecole Polytech Dept Mech Engn Montreal PQ H3C 3A7 Canada

ISBN: (纸本)0819431613

Several years ago, the use of shape memory alloys (SMA) in industrial applications gained a real interest. Even if SMA suppliers can produce a wide variety of materials, the elaboration of efficient and optimized applications remains quite hazardous due to the lack of computer-aided design tools. To fill this gap, a new phenomenological material law based on kriging was recently developed. From a single formulation constructed with isothermal tensile curves, the model calculates the thermomechanical behavior of SMA including superelasticity, one-way and assisted two-way shape memory effects among others. This paper presents the concepts that are used to generalize the model from a uniaxial to a tensorial formulation. Equivalent values defined from a Prager criterion are adapted from plasticity. Numerical results are validated by a series of experimental curves obtained with SMA samples for different loading conditions. The generalized material law is intended to be implemented with finite elements in order to calculate the thermomechanical behavior of complex shape memory devices.

关键词： Shape memory alloys 3D modeling Actinium Chlorine Electroluminescence algorithm development Astatine Computer aided design Nomenclature Solid modeling

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AUTOMATED SUPPORT FOR DEVELOPING RETRIEVE-AND-PROPOSE SYSTEMS

AUTOMATED SUPPORT FOR DEVELOPING RETRIEVE-AND-PROPOSE SYSTEM...

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

作者： SIMOUDIS, E MENDALL, A MILLER, P Lockheed AI Ctr. (United States)

ISBN: (纸本)081941199X

We have studied the retrieve-and-propose problem-solving method, a specialization of the general case-based reasoning method, in terms of its tasks in the context of fault recovery domains. We analyzed the case retrieval and learning tasks that are primarily used in the retrieve-and-propose method, decomposed them into appropriate subtasks, associated decisions for selecting each subtask, and implemented methods for accomplishing each task. We have implemented a system, called REPRO for retrieve and propose, that incorporates the results of this analysis and facilitates the selection of the appropriate algorithms for implementing a case- based expert system. We have used REPRO to develop the CABER case-based fault recovery system.

关键词： Evolutionary algorithms Feature extraction algorithm development Artificial intelligence Manufacturing Databases Prototyping Analytical research Systems modeling Aluminum

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