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检索条件"主题词=Algorithm development"

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Utilization of redundancy in ROI reconstruction with backprojection filtration from fan-beam truncated data

Utilization of redundancy in ROI reconstruction with backpro...

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Medical Imaging 2005 Conference

作者： Zou, Y Pan, XC Xia, D Univ Chicago Dept Radiol Chicago IL 60637 USA

ISBN: (纸本)0819457213

In fan-beam computed tomography (CT), one may be interested in image reconstruction in a region of interest (ROI) from truncated data acquired over an angular range less than half-scan data. We developed recently a backprojection filtration (BPF) algorithm to reconstruct an ROI image from reduced scan data containing data truncations. In a reduced scan., the truncated data may still contain redundancy. In this work, we describe a new algorithm that can exploit data redundancy in truncated data for potentially suppressing the aliasing and noise artifacts in reconstructed images. We have performed numerical studies to demonstrate the BPF algorithm.

关键词： Reconstruction algorithms Image segmentation algorithm development CT reconstruction Detector arrays Data acquisition Image restoration Computed tomography Image quality Detection and tracking algorithms

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Application of super image methods in digital holography

Application of super image methods in digital holography

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Conference on Optical Measurement Systems for Industrial Inspection IV

作者： Kornis, J Gombköto, B Budapest Univ Technol & Econ Dept Phys H-1521 Budapest Hungary

ISBN: (纸本)0819458562

As in the classical holography, a major issue in digital holography is the enhancement of the resolution of the digital holograms. It means not only the enhancement of the image quality, but the extension of the upper measuring range too. One natural way can be the application of higher resolution recording devices. Unfortunately the price of a doubled resolution camera is approximately fourfold. In the presentation a different way of the resolution enhancement is shown. The resolution enhancement (building the super image) is based on the building of well sampled so called super images from a set of under sampled but dithered input images. Such methods are originated from the drizzle method, and from the Fourier spectrum combination method. Using these methods not only the resolution of the digital hologram can be increased, but the object distance also can be dramatically shortened.

关键词： Digital holography Holograms CCD cameras Holography Image enhancement Image resolution Digital imaging Resolution enhancement technologies Optical resolution algorithm development

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Effective IP protection method of mask data using OASIS format

Effective IP protection method of mask data using OASIS form...

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Conference on Photomask and Next-Generation Lithography Mask Technology XII

作者： Nishizawa, K Endo, M Kato, K SII NanoTehcnol Inc MDP Grp Div Engn Chiba 2618507 Japan

ISBN: (纸本)0819458538

We have been developing intellectual properties (IP) protection software using OASIS format. In the Photomask Technology 2004 we presented that by taking advantage of repetition presentation of OASIS, it becomes possible to express arrayed patterns without any generation of new cells, which also brings less overhead and further compaction of the result filed([1]). As a result, we could rebuild the hierarchy without cell generation and reduce the output file size. In this paper, additionally we have applied a unique compression function CBLOCK defined in OASIS format. CBLOCK can compress any part of OASIS file. The experimental results show that there are no redundant cells generated and the file size has become approximately 20 times smaller than conventional methods.

关键词： Parallel processing Image compression Photomasks Local area networks Process control algorithm development Control systems Data storage Image processing Intellectual property

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Effects of registration errors on multi-look averaged data

Effects of registration errors on multi-look averaged data

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Conference on Detection and Remediation Technologies for Mines and Minelike Targets X

作者： Ranney, K Tran, C USA Res Lab Adelphi MD 20783 USA

ISBN: (纸本)0819457795

Multi-look processing provides a straightforward method for enhancing the quality of grainy (speckle-filled) synthetic aperture radar (SAR) imagery. This improvement in quality results from a reduction in variability of the individual pixel values brought about by non-coherent averaging of multiple, statistically independent views of the same scene. That is, the variance of the average of independent, identically distributed random variables is inversely proportional to the number of independent looks that are averaged. Of course, the quality of the averaged image depends heavily on the accuracy of the algorithm used to align the individual looks prior to averaging. The Army Research Laboratory (ARL) has recently applied multi-look processing techniques to sets of images from independent views to generate look-averaged images. In the course of this processing, we have identified the need to quantify any degradation in multi-look image quality resulting from mismatches in registration of the individual looks used to form the look-averaged image. Since these degradations can affect the performance of automatic target detection algorithms, we have also identified the need to quantify the effects of look-averaged image degradation on the performance of such algorithms. In this paper, we use X-Band SAR data to determine the extent to which translational and rotational errors in the registration of individual looks degrade the quality of the resulting multi-look averaged image. We then examine how this degradation in image quality impacts the automatic detection of small targets in the final, look-averaged image. Finally, we introduce variations in target-to-clutter ratio within each of the individual looks and analyze how these changes affect the resulting look-averaged image.

关键词： Image quality Synthetic aperture radar Detection and tracking algorithms Image processing Target detection Image registration Palladium Monte Carlo methods algorithm development X band

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High productivity object-oriented defect detection algorithms for the new modular die-to-database reticle inspection platform

High productivity object-oriented defect detection algorithm...

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21st European Mask and Lithography Conference (EMLC 2005)

作者： Avakaw, S Planar State Sci & Prod Concern Precis Machine Bl Minsk 220763 BELARUS

ISBN: (纸本)0819458309

The paper presents a description of one of the main elements of a new modular automatic reticle defect inspection platform - a defect detection sub-system. This platform is currently under active development at Planar Concern. This paper presents the results of the use of the object-oriented approach which was used in the development of the defect detection algorithms for the die-to-database reticle inspection system. Furthermore, the paper presents briefly the architecture and technology of the new modular automatic reticle inspection platform.

关键词： Reticles Inspection Defect detection Detection and tracking algorithms algorithm development Databases Data modeling Lithography Image enhancement Image processing

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Investigation of a model vertical motion liquid damper: Comparing numerical simulation and experimental evidence

Investigation of a model vertical motion liquid damper: Comp...

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Smart Structures and Materials 2005 Conference

作者： Papadopoulos, C Tabatabai, H Buechel, C Univ Wisconsin Dept Civil Engn & Mech Milwaukee WI 53201 USA

ISBN: (纸本)0819457418

Tuned Liquid Dampers (TLD) are used to limit horizontal vibrations in structures, and offer practical alternatives to Tuned Mass Dampers (TMD). However, to our knowledge, liquid damping systems have not been developed to reduce vertical vibrations. In this work, we develop a model for a Vertical Motion Liquid Damper (VMLD), idealized as a discrete, two degree of freedom system. One degree of freedom represents the 'target' structure that is to be damped, and the other represents the approximate, one-dimensional motion of a liquid in a U-shaped tube. Internal losses due to the fluid oscillation serve to limit and control motions of the target structure. The U-shaped tube has a flexible joint such that one vertical portion and the horizontal portion of the tube remain fixed, and the remaining vertical portion of the tube is affixed to the vibrating structure, allowing the liquid to become excited. The equations of motion are derived using Lagrange's Equations, and are integrated using Runge-Kutta algorithms that are available in Matlab. An experimental model was built in the laboratory, consisting of a mass attached to the end of a cantilevered beam (corresponding to the target structure), and a U-tube made from PVC pipe. The various damping and stiffness parameters of the system were calibrated independently based on experimental data. Measured data from the experimental model show reasonable agreement with numerical simulations.

关键词： Liquids Motion models Numerical simulations Head Motion measurement Systems modeling Data modeling Calibration Fluid dynamics algorithm development

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Validation of ocean wind vector retrievals from WindSat polarimetric measurements

Validation of ocean wind vector retrievals from WindSat pola...

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Conference on Active and Passive Remote Sensing of the Oceans

作者： Jelenak, Z Mavor, JP Connor, L Wang, NY Chang, P Gaiser, P NOAA NESDIS Off Res & Applicat Camp Springs MD 20746 USA

ISBN: (纸本)0819456179

Using several months of WindSat measurements collocated with the NCEP Global Data Assimilation System model field, the Special Sensor Microwave Imager (SSM/I) measurements and QuikScat scatterometry measurements, we have derived an empirical geophysical model that describes radiometric vector for all WindSat channels, as a function of surface parameters: wind speed, wind direction and sea surface temperature, and atmospheric parameters: total precipitabte water and cloud liquid water. This model function was then used to develop an ocean surface wind vector retrieval algorithm from WindSat polarimetric measurements. The accuracy of the retrieved wind vectors was quantified using several months of WindSat measurements collocated with the Special Sensor Microwave Imager (SSM/I) measurements and QuikSCAT scatterometry measurements.

关键词： Data modeling algorithm development Clouds Liquids Polarimetry Evolutionary algorithms Microwave radiation Atmospheric modeling Digital filtering Temperature metrology

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A study of factors affecting multiple target tracking with a pixelized sensor - art. no. 59130L

A study of factors affecting multiple target tracking with a...

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17th Conference on Signal and Data Processing of Small Targets

作者： Morelande, MR Kreucher, CM Kastella, K Univ Melbourne Dept Elect & Elect Engn Parkville Vic 3010 Australia

ISBN: (纸本)0819459186

Factors affecting the performance of an algorithm for tracking multiple targets observed using a pixelized sensor are studied. A pixelized sensor divides the surveillance region into a grid of cells with targets generating returns on the grid according to some known probabilistic model. In previous work an efficient particle filtering algorithm was developed for multiple target tracking using such a sensor. This algorithm is the focus of the study. The performance of the algorithm is affected by several considerations. The pixelized sensor model can be used with either thresholded or non-thresholded measurements. While it is known that information is lost when measurements are thresholded, quantitative results have not been established. The development of a tractable algorithm requires that closely-spaced targets are processed jointly while targets which are far apart are processed separately. Selection of the clustering distance involves a trade-off between performance and computational expense. A final issue concerns the computation of the proposal density used in the particle filter. Variations in a certain parameter enable a trade-off between performance and computational expense. The various issues are studied using a mixture of theoretical results and Monte Carlo simulations.

关键词： Particles Detection and tracking algorithms Signal to noise ratio Sensors algorithm development Monte Carlo methods Surveillance Particle filters Target detection Solids

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Multiple target tracking and classification improvement using data fusion at node level using acoustic signals

Multiple target tracking and classification improvement usin...

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Conference on Unattended Ground Sensor Technologies and Applications VII

作者： Damarla, TR Whipps, G USA Res Lab ATTN AMSRD ARL SE SA Adelphi MD 20783 USA

ISBN: (纸本)0819457817

Target tracking and classification using passive acoustic signals is difficult at best as the signals are contaminated by wind noise, multi-path effects, road conditions, and are generally not deterministic. In addition, microphone characteristics, such as sensitivity, vary with the weather conditions. The problem is further compounded if there are multiple targets, especially if some are measured with higher signal-to-noise ratios (SNRs) than the others and they share spectral information. At the U. S. Army Research Laboratory we have conducted several field experiments with a convoy of two, three, four and five vehicles traveling on different road surfaces, namely gravel, asphalt, and dirt roads. The largest convoy is comprised of two tracked vehicles and three wheeled vehicles. Two of the wheeled vehicles are heavy trucks and one is a light vehicle. We used a super-resolution direction-of-arrival estimator, specifically the minimum variance distortionless response, to compute the bearings of the targets. In order to classify the targets, we modeled the acoustic signals emanated from the targets as a set of coupled harmonics, which are related to the engine-firing rate, and subsequently used a multivariate Gaussian classifier. Independent of the classifier, we find tracking of wheeled vehicles to be intermittent as the signals from vehicles with high SNR dominate the much quieter wheeled vehicles. We used several fusion techniques to combine tracking and classification results to improve final tracking and classification estimates. We will present the improvements (or losses) made in tracking and classification of all targets. Although improvements in the estimates for tracked vehicles are not noteworthy, significant improvements are seen in the case of wheeled vehicles. We will present the fusion algorithm used.

关键词： Sensors Detection and tracking algorithms Acoustics Signal to noise ratio algorithm development Data fusion Roads Databases Roentgenium Target detection

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A flexible architecture for Advanced Process Control solutions

A flexible architecture for Advanced Process Control solutio...

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Conference on Data Analysis and Modeling for Process Control II

作者： Faron, K Iourovitski, I Blue Control Technol Burlingame CA 94010 USA

ISBN: (纸本)0819457353

Advanced Process Control (APC) is now mainstream practice in the semiconductor manufacturing industry. Over the past decade and a half APC has evolved from a "good idea", and "wouldn't it be great" concept to mandatory manufacturing practice. APC developments have primarily dealt with two major thrusts, algorithms and infrastructure, and often the line between them has been blurred. The algorithms have evolved from very simple single variable solutions to sophisticated and cutting edge adaptive multivariable (input and output) solutions. Spending patterns in recent times have demanded that the economics of a comprehensive APC infrastructure be completely justified for any and all cost conscious manufacturers. There are studies suggesting integration costs as high as 60% of the total APC solution costs. Such cost prohibitive figures clearly diminish the return on APC investments. This has limited the acceptance and development of pure APC infrastructure solutions for many fabs. Modern APC solution architectures must satisfy the wide array of requirements from very manual R&D environments to very advanced and automated "lights out" manufacturing facilities. A majority of commercially available control solutions and most in house developed solutions lack important attributes of scalability, flexibility, and adaptability and hence require significant resources for integration, deployment, and maintenance. Many APC improvement efforts have been abandoned and delayed due to legacy systems and inadequate architectural design. Recent advancements (Service Oriented Architectures) in the software industry have delivered ideal technologies for delivering scalable, flexible, and reliable solutions that can seamlessly integrate into any fabs' existing system and business practices. In this publication we shall evaluate the various attributes of the architectures required by fabs and illustrate the benefits of a Service Oriented Architecture to satisfy these requirements. Blue Co

关键词： Manufacturing Computer architecture Control systems Process control Semiconductors Reliability Semiconductor manufacturing algorithm development Human-machine interfaces Logic

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