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检索条件"主题词=Algorithm Development"

共 1741 条记录，以下是1121-1130 订阅

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LARGE AREA OPTICAL DESIGN RULE CHECKER FOR LOGIC PSM APPLICATION

LARGE AREA OPTICAL DESIGN RULE CHECKER FOR LOGIC PSM APPLICA...

引用

1st International Symposium on Photomask and X-Ray Mask Technology (Photomask Japan 94)

作者： NISTLER, JL SPENCE, C BAROUCH, E HOLLEBACH, U ADV MICRO DEVICES INC SUNNYVALECA

ISBN: (纸本)0819415634

An aerial optical design rule checker (ODRC) that will handle large areas is used to validate the automatic CAD software used for application of alternating Phase Shift Mask technology to logic devices. An automatic alternating aperture layout algorithm developed internally by Advanced Micro Devices is applied to 0.24 to 0.50 micrometers electrical designs. The layout is then verified for different stepper and defocus values by the ODRC which utilizes the simulated aerial image to compare directly to the electrical design database. Entire databases are handled by fracturing the database into optically isolated areas or by using a sliding window technique. Small areas up to 420 um per side can be done with single processor workstations with at least 512 megabyte of memory. Larger problems require multiprocessor computers with at least 16 gigabyte of memory. Full circuit analysis should be done on systems with at least 64 gigabyte of memory in order to accomplish solving the problem in a reasonable time frame.

关键词： Photomasks Computer aided design Image processing Optical design Databases Logic X-ray technology Logic devices algorithm development Computing systems

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EVALUATION OF A CHARGE INJECTION DEVICE ARRAY 4

EVALUATION OF A CHARGE INJECTION DEVICE ARRAY

引用

Conference on Charge-Coupled Devices and Solid State Optical Sensors IV

作者： NINKOV, Z TANG, C EASTON, RL ROCHESTER INST TECHNOL CTR IMAGING SCIOPT SCI GRPROCHESTERNY 14623

ISBN: (纸本)0819414670

A Charge Injection Device Technologies 512 X 512 CID array has been tested at liquid nitrogen temperature to assess its suitability for use in low light applications. The CID-38 chip used was installed in a SICam dewar/electronics from CIDTEC. For this particular system the noise floor was measured to be approximately equals 260 electrons rms for a single readout. Using the nondestructive readout option an approximately equals (root)N, where N is the number of readouts, improvement in this noise figure can be achieved. The average dark current at 77 degree(s)K was not measurable in a three-hour dark integration.

关键词： Camera shutters Electrons Interference (communication) Tin Image processing Nondestructive evaluation algorithm development Chlorine Liquids Signal to noise ratio

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BOX CONNECTIVITY APPROACH TO MULTIFONT CHARACTER-RECOGNITION

BOX CONNECTIVITY APPROACH TO MULTIFONT CHARACTER-RECOGNITION

引用

Conference on Document Recognition

作者： KRTOLICA, R CANON RES CTR AMER INC PALO ALTOCA 94304

ISBN: (纸本)081941476X

The idea of box connectivity approach (BCA) is to partition the bounding frame of the character bitmap into a fixed number of rectangles, to define some properties of those rectangles, and to establish connectivity relations between the rectangles. Hamming distance and vector optimization are used for classification. Good results in recognition of high quality data (400 dpi) in three fonts (Courier, Helvetica, and New Times Roman) and eight sizes (from 8 to 24 points) were reported in a previous paper. These findings are confirmed in this paper by an experiment showing that, for the same number of bits, BCA features increase the rate of recognition twice with respect to features obtained by simple decimation. However, the actual method is limited by the fact that the number of referent templates increases with the number of fonts to be recognized. The purpose of this paper is to remove this limitation. The main part of the paper discusses the properties of the Hamming distance and how they can be used in the BCA algorithm to improve the efficiency of classification. The last section reports the results of an experiment showing the discrimination power of BCA features.

关键词： Raster graphics Detection and tracking algorithms Optical character recognition Binary data Image classification algorithm development Antimony Feature extraction Statistical analysis Tin

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EFFECT OF CROSS-CORRELATION ON TRACK-TO-TRACK FUSION

EFFECT OF CROSS-CORRELATION ON TRACK-TO-TRACK FUSION

引用

Conference on Signal and Data Processing of Small Targets 1994

作者： SAHA, RK MITRE CORP BEDFORDMA 01730

ISBN: (纸本)0819415391

Since the advent of target tracking systems employing a diverse mixture of sensors, there has been increasing recognition by air defense system planners and other military system analysts of the need to integrate these tracks so that a clear air picture can be obtained in a command center. A popular methodology to achieve this goal is to perform track-to-track fusion, which performs track-to-track association as well as kinematic state vector fusion. This paper seeks to answer analytically the extent of improvement achievable by means of kinetic state vector fusion when the tracks are obtained from dissimilar sensors (e.g., Radar/ESM/IRST/IFF). It is well known that evaluation of the performance of state vector fusion algorithms at steady state must take into account the effects of cross-correlation between eligible tracks introduced by the input noise which, unfortunately, is often neglected because of added computational complexity. In this paper, an expression for the steady-state cross-covariance matrix for a 2D state vector track-to-track fusion is obtained. This matrix is shown to be a function of the parameters of the Kalman filters associated with the candidate tracks being fused. Conditions for positive definiteness of the cross-covariance matrix have been derived and the effect of positive definiteness on performance of track-to-track fusion is also discussed.

关键词： Sensors Filtering (signal processing) Matrices Kinematics Detection and tracking algorithms Chemical elements Electronic filtering algorithm development Data fusion Sensor fusion

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OBJECTIVE CHARACTERIZATION OF IMAGE ACUTANCE

OBJECTIVE CHARACTERIZATION OF IMAGE ACUTANCE

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Conference on Image Perception: Medical Imaging 1994

作者： ELKADIKI, SG RANGAYYAN, RM UNIV CALGARY DEPT ELECT & COMP ENGNCALGARY T2N 1N4ALBERTACANADA

ISBN: (纸本)0819414611

Acutance refers to the sharpness and thus the perceptibility of features in an image. Currently available methods for characterization of perceptibility of image features are either highly subjective or statistical. There is a need for a purely objective measure to characterize the perceptibility of image features. This paper proposes a measure of acutance based on gray-level variations across the boundary of an object. An algorithm to calculate the acutance based on region growing and a derivative measure across region boundaries has been designed and implemented. After testing the algorithm on various images, it is shown that this measure can accurately reflect changes in the appearance of objects due to blurring and sharpening. Using this technique, it is possible to quantify the level of enhancement in a digital image by calculating the acutance before and after the enhancement operation.

关键词： Image enhancement Edge detection Visualization Eye Image filtering algorithm development Image analysis Image processing Digital imaging Tolerancing

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MODIFYING HYDRA FOR THE WIYN TELESCOPE - AN OPTIMUM TELESCOPE, FIBER MOS COMBINATION 8

MODIFYING HYDRA FOR THE WIYN TELESCOPE - AN OPTIMUM TELESCOP...

引用

8th SPIE Conference on Instrumentation in Astronomy

作者： BARDEN, SC ARMANDROFF, T MULLER, G RUDEEN, AC LEWIS, J GROVES, L NATL OPT ASTRON OBSERV KITT PEAK NATL OBSERVTUCSONAZ 85726

ISBN: (纸本)081941493X

The KPNO fiber-fed, multi-object spectroscopic instrument, Hydra, is being moved from the Mayall to the WIYN telescope. The WIYN telescope has good concentricity between the focal surface radius and the exit pupil. The primary modification to the instrument will allow the fibers to align with the telescope exit pupil while lying along the curved focal surface. Maximum pupil alignment losses will be reduced from 15% at the Mayall to 5% at the WIYN. The new orientation of the instrument requires a different mechanism for accessing the fiber and focal plate for maintenance. We are also upgrading the manner in which the fibers are held in place around the focal plane in order to reduce neighboring fiber interactions beyond the pivot circle. The wavelength calibration assembly is being modified to take advantage of extra room in the instrument. For guiding, instead of using offset guide probes, we are developing an algorithm which will utilize the field orientation probes. The Bench Spectrograph associated with Hydra is also being moved over to the WIYN, however, we do not discuss the spectrograph in this paper.

关键词： Telescopes Calibration Lamps Space telescopes Spectrographs Molybdenum algorithm development Astronomical imaging Spherical lenses Stars

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BALLISTIC-MISSILE TRACK INITIATION FROM SATELLITE-OBSERVATIONS

BALLISTIC-MISSILE TRACK INITIATION FROM SATELLITE-OBSERVATIO...

引用

Conference on Signal and Data Processing of Small Targets 1994

作者： YEDDANAPUDI, M BARSHALOM, Y PATTIPATI, KR DEB, S UNIV CONNECTICUT DEPT ELECT & SYST ENGNSTORRSCT 06269

ISBN: (纸本)0819415391

This paper presents an algorithm to initiate tracks of a ballistic missile in the initial exoatmospheric phase, using line of sight measurements from one or more moving platforms (typically satellites). The major feature of this problem is the poor target motion observability which results in a very ill-conditioned estimation problem.

关键词： Satellites Sensors Error analysis Detection and tracking algorithms Missiles Monte Carlo methods Earth observing sensors algorithm development Motion estimation Time metrology

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ITERATIVE METHOD FOR INTERFEROGRAM PROCESSING

ITERATIVE METHOD FOR INTERFEROGRAM PROCESSING

引用

Interferometry 94 - New Techniques and Analysis in Optical Measurements Conference

作者： KOTLYAR, VV SERAPHIMOVICH, PG ZALYALOV, OK RUSSIAN ACAD SCI INST IMAGE PROC SYSTSAMARA 443001RUSSIA

ISBN: (纸本)0819416738

We have developed and numerically evaluated an iterative algorithm for interferogram processing including the Fourier-transform method, the Gerchberg-Papoulis algorithm and Wiener's filter-based regularization used in combination. Using a signal-to-noise ratio not less than 1, it has been possible to reconstruct the phase of an object field with accuracy better than 5%.

关键词： Fourier transforms algorithm development Reconstruction algorithms Electronic filtering Iterative methods Signal to noise ratio Computer simulations Image processing Software development Spatial resolution

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SUBPIXEL RESOLUTION WITH STEERABLE FILTERS 2

SUBPIXEL RESOLUTION WITH STEERABLE FILTERS

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Conference on Image and Video Processing II

作者： BRAKEFIELD, JC Conceptual MindWorks Inc. (United States)

ISBN: (纸本)0819414778

As part of a project to utilize advanced software to diagnose multi-layer circuit card assemblies, the signal traces were separated into top and bottom layers. The source images were stereo x-ray images, 2 K by 2 K by 12 bits. The a stereo software algorithm was developed using steerable filters as a means of precisely determining signal trace location and orientation. A new stereopsis algorithm was derived which efficiently allocates signal traces to particular layers. The paper relates the approach taken to biological vision and its characteristic of hyperacuity. And to the subject of model building and model fitting.

关键词： Image segmentation Simulation of CCA and DLA aggregates Wavelets Signal processing X-rays Image filtering X-ray imaging algorithm development Image processing Electronic filtering

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BEARINGS-ONLY TRACKING IN A DISTRIBUTED SENSOR NETWORK USING REDUCED SUFFICIENT STATISTICS

BEARINGS-ONLY TRACKING IN A DISTRIBUTED SENSOR NETWORK USING...

引用

Conference on Signal and Data Processing of Small Targets 1994

作者： ANDERSON, KL ILTIS, RA UNIV CALIF SANTA BARBARA CTR INFORMAT PROC RESDEPT ELECT & COMP ENGNSANTA BARBARACA 93106

ISBN: (纸本)0819415391

A distributed parameter estimation algorithm is presented for a general nonlinear measurement model with additive Gaussian noise. We show that the Bayes-closed estimation algorithm developed by Kulhavy, when extended to the multisensor case leads to a linear fusion rule, regardless of the form of a local a posteriori densities. Specifically, the Kulhavy algorithm generates a set of reduced sufficient statistics representing the local sensor densities, which are simply added and subtracted at the global processor to obtain optimum fusion. We discuss various approximations to the Bayes-closed algorithm which leads to a practical parameter estimator for the nonlinear measurement model, and apply such an approximate technique to the bearings-only tracking problem. The performance of the distributed tracker is compared to an alternative algorithm based on the extended Kalman filter (EKF) implemented in modified polar coordinates. It is shown that the Bayes-closed estimator does not diverge in the sense of an ordinary EKF, and hence the Bayes-closed technique can be employed in both a unidirectional and bidirectional transmission mode.

关键词： Received signal strength Detection and tracking algorithms Sensors Reconstruction algorithms algorithm development Error analysis Data communications Statistical analysis Filtering (signal processing) Sensor networks

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