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检索条件"主题词=Algorithm development"

共 1737 条记录，以下是911-920 订阅

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Scale-cumulant domain deconvolution of sensor array signals

Scale-cumulant domain deconvolution of sensor array signals

引用

Conference on Advanced Signal Processing algorithms, Architectures, and Implementations X

作者： Izzetolu, M Akgül, T Drexel Univ Dept Elect & Comp Engn Philadelphia PA 19104 USA

ISBN: (纸本)0819437611

In this paper we combine two recently developed multi-scale deconvolution algorithms, known as the scale-time domain method and the sum-of-cumulants domain method. We formulate the deconvolution problem in the scale-cumulant domain using the Scale Transform (ST) and show that the procedure is simpler when the unknown source signal is non-minimum phase and robust if Gaussian noise exists.

关键词： Sensors Deconvolution Electronic filtering Interference (communication) algorithm development Reflectors Signal processing Convolution Detection theory Image processing

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Bit-allocation considering mean absolute error for image compression

Bit-allocation considering mean absolute error for image com...

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Conference on Visual Information Processing IX

作者： Goswami, H Kozaitis, SP Florida Inst Technol Div Elect & Comp Sci & Engn Melbourne FL 32901 USA

ISBN: (纸本)0819436674

In lossy image compression schemes, often some distortion measure is minimized to arrive at a desired target bit rate. The distortion measure that has been most studied is the mean-squared-error (MSE). However, perceptual quality often does not agree with the notion of minimization of mean square error1 . Since MSE can not guarantee the optimality of perceptual quality, others error measures have been investigated. Others have found strong mathematical and practical perspective to choose a different error measure other than MSE, especially for image compression2. In Ref. 2 it is argued that the mean absolute error (MAE) measure is a better error measure than MSE for image compression from a perceptual standpoint. In addition, the MSE measure fails when only a small proportion of extreme observations is present3. In this paper we develop a bit allocation algorithm to minimize the MAE rather than MSE

关键词： Image compression Distortion Quantization algorithm development Wavelets Computer engineering Computer science Error analysis Quality measurement Visual information processing

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Characterizing point spread signals for subsurface synthetic imaging

Characterizing point spread signals for subsurface synthetic...

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2nd International Conference on Subsurface Sensing Technologies and Applications

作者： Rodriguez, D Univ Puerto Rico Dept Elect & Comp Engn Computat Signal Proc Grp Mayaguez PR 00681 USA

ISBN: (纸本)0819437743

This work concentrates on the analysis of radar signature signals for the characterization and efficient computation of finite discrete two-dimensional point spread functions. A general simple model for ground penetrating raw data image formation is assumed in order to concentrate on the efficient computation of point spread functions. The point spread functions are used as impulse response functions for the simulation of high resolution image of two dimensional synthetic aperture imaging kernels. A methodology has been developed to serve as a tool aid in the analysis, design, and efficient implementation of one-dimensional and two-dimensional fast Fourier transform (FFT) algorithms prevalent in SAR image formation operations with the idea in mind of reducing the computational effort and improving the hardware implementation process. Kronecker products algebra, a branch of finite dimensional multilinear algebra, has been demonstrated to be a useful tool aid in the devel-opment of fast algorithms for unitary transformations and in the identification of similarities and differences among FFT computational frameworks.

关键词： Image acquisition Synthetic aperture radar algorithm development Image processing Point spread functions Fourier transforms Data modeling Signal processing Radar Image resolution

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Tool for computer-assisted geo-spatial registration and truthing of images of differing dimensionality and resolution

Tool for computer-assisted geo-spatial registration and trut...

引用

Conference on Automated Geo-Spatial Image and Data Exploitation

作者： Williams, B Amphay, S Stansbery, S Hulsey, D Nichols Res Corp Shalimar FL 32579 USA

ISBN: (纸本)0819436801

The Air Force Research Lab, Advanced Guidance Division, AFRL/MNG located at Eglin AFB has expanded the capabilities of its Modular algorithm Concept Evaluation Tool (MACET) for autonomous target acquisition (ATA) analysis to include an imagery truth editor for simultaneously displaying and working with multiple images of differing dimensionality and resolution. To support multi-sensor truthing, the MACET Truth Editor performs computer-assisted geo-spatial registration between multiple two-dimensional (2-D) images, or between 2-D images and three-dimensional (3-D) images. The input images of overlapping scenes may be obtained from various sensor types (visible, passive infrared, laser radar (ladar), etc.) and taken at different sensor locations and orientations. Registration of 3-D to 2-D and 2-D to 2-D imagery pixels is made to a reference 3-D coordinate system using "hints" provided by an analyst. Hints may include some combinations of the following to reach an approximate solution to the registration problem: marking of common points in each image, marking of horizon lines in 2-D images, entry of imagery sensor characteristics (FOV, FPA layout, etc.), and entry of relative sensor location and orientation. The MACET Truth Editor has a consistent user interface that allows registration hints to be entered and truthing operations to be performed graphically.

关键词： Sensors Image registration Detection and tracking algorithms algorithm development 3D image processing LIDAR 3D acquisition Data conversion Image resolution Human-machine interfaces

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Bubble velocity measurements using binary image processing techniques

Bubble velocity measurements using binary image processing t...

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Conference on Applications of Digital Image Processing XXIII

作者： Bui-Dinh, T Choi, TS Kwangju Inst Sci & Technol Dept Mechatron Buk Ku Kwangju 500712 South Korea

ISBN: (纸本)0819437603

The bubble rise velocity in air/water two-phase now in a vertical pipe is studied experimentally by processing consecutive series of digitized video images. The shape of the bubble, as well as its instantaneous velocity is measured by using binary image processing techniques. Digital image processing algorithms have been developed to obtain the coordinates of specified points in image. This coordinate data was used to calculate the instantaneous bubble velocity, which can be expressed as a separation distance between the two consecutive image frames. This method has many advantages, it is a non-invasive measurement, and does not require sophisticated laboratory equipment. Images ate directly digitized by using CCD digital camera. Image analysis involves purely computer-based computation. Hence reasonably accurate velocity data has been obtained from only one experiment in a small period of time.

关键词： Binary data Image processing Velocity measurements Digital image processing algorithm development Image analysis CCD cameras Digital imaging Camera shutters Digital cameras

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Closed-loop hover test results with a neurocontroller on piezoactuated smart rotor blades

Closed-loop hover test results with a neurocontroller on pie...

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Smart Structures and Materials 2000 Conference

作者： Spencer, MG Sanner, RM Chopra, I Univ Maryland Dept Aerosp Engn Alfred Gessow Rotorcraft Ctr College Pk MD 20742 USA

ISBN: (纸本)0819436038

On-blade smart structure actuators are capable of actively altering the aerodynamic loads on rotor blades. With a suitable feedback control law, such actuators could potentially be used to counter the vibrations induced by periodic aerodynamic loading on the blades with lower weight penalties than the previous actuation methods and without the bandwidth constraints. This paper covers the development and testing of a new, robust individual blade control (IBC) methodology for rotor vibration suppression using piezo actuated trailing edge flaps and active twist tip rotors. The controller uses a neural network to learn to actuate the trailing edge flap thus adaptively suppressing the blade or hub vibrations. In this application, no offline training is performed. Instead, a neural network is used in real time to adaptively command the actuator deflections thus reducing vibrations. Closed loop experimental tests with piezo actuated scale rotor systems were conducted on the University of Maryland hover test stand. The results include two different Mach scale smart rotor systems (trailing edge flaps and active tip twist) that were controlled by the same adaptive neurocontrol algorithm. These tests demonstrate the controller's robust ability to successfully learn to control the rotor vibrations with no a priori information about the blade/actuator structure or the aerodynamic loading.

关键词： Actuators Neural networks Aerodynamics Control systems algorithm development Filtering (signal processing) Data acquisition Vibration control Smart structures Servomechanisms

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150nm DR contact holes die-to-database inspection

150nm DR contact holes die-to-database inspection

引用

Conference on Photomask and Next-Generation Lithography Mask Technology VII

作者： Kuo, SC Wu, C Eran, Y Staud, W Hemar, S Lindman, O Taiwan Mask Corp. (Taiwan) Applied Materials (Taiwan) Applied Materials (Israel) Applied Materials (United States)

ISBN: (纸本)0819437026

Using a failure analysis-driven yield enhancements concept, based on an optimization of the mask manufacturing process and UV reticle inspection is studied and shown to improve the contact layer quality. This is achieved by relating various manufacturing processes to very fine tuned contact defect detection. In this way, selecting an optimized manufacturing process with fine-tuned inspection setup is achieved in a controlled manner. This paper presents a study, performed on a specially designed test reticle, which simulates production contact layers of design rule 250nn, 180nm and 150nm. This paper focuses on the use of advanced UV Reticle inspection techniques as part of the process optimization cycle. Current inspection equipment uses traditional and insufficient methods of small contact-hole inspection and review.

关键词： Inspection Reticles Photomasks Semiconducting wafers Manufacturing Critical dimension metrology Defect detection algorithm development Printing Ultraviolet radiation

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Parallel visualization of large data sets

Parallel visualization of large data sets

引用

7th Meeting on Visual Data Exploration and Analysis

作者： Rosenberg, R Lanzagorta, M Chtchelkanova, A Khokhlov, A USN Res Lab Washington DC 20375 USA

ISBN: (纸本)0819435783

In this paper we describe our efforts towards the parallel visualization of large data sets. We describe the Fully Threaded Tree (FTT) structure developed at NRL to tackle the problem of massive parallel calculations using adaptive mesh refinement methods. All operations with FTT are performed in parallel and require only a small memory overhead. The FTT can be viewed as a data compression scheme that dramatically improves the performance of standard finite difference algorithms by performing calculations on the compressed data in situ. Because of the tremendous benefits of this type of data structure, it is of great interest to develop visualization algorithms that are native to the FTT. Using the FTT library, we convert the FTT data structure to an unstructured data set and discuss applications to both scatter dot visualization and parallel ray-tracing. The latter technique gives a good indication of the performance and scalability of the FTT algorithm for ray-tracing. We then discuss conversion of the FTT data structure for virtual reality visualization in an immersive room. Our results are presented using an example of a numerical calculation of a detonation in a rectangular cavity using from 1 to 2 million cells.

关键词： Visualization Data conversion algorithm development Computer simulations Volume rendering Analytical research Optical spheres Ray tracing Virtual reality Software

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Real time distributed map building in large environments

Real time distributed map building in large environments

引用

Conference on Sensor Fusion and Decentralized Control in Robotic Systems III

作者： Julier, SJ Uhlmann, JK Naval Research Lab. (United States) Univ. of Missouri/Columbia (United States)

ISBN: (纸本)0819438618

Many of the future missions for mobile robots demand multi-robot systems which are capable of operating in large environments for long periods of time. One of the most critical capabilities is the ability to localize - a mobile robot must be able to estimate its own position and to consistently transmit this information to other robots and control sites. Although state-of-the-art GPS is capable of yielding unmatched performance over large areas, it is not applicable in many environments (such as within city streets, under water, indoors, beneath foliage or extra-terrestrial robotic missions) where mobile robots are likely to become commonplace. A widely researched alternative is Simultaneous Localization and Map Building (SLAM): the vehicle constructs a map and, concurrently, estimates its own position. However, most approaches are non-scalable (the storage and computational costs vary quadratically and cubically with the number of beacons in the map) and can only be used with multiple robotic vehicles with a great degree of difficulty. In this paper, we describe the development of a scalable, multiple-vehicle SLAM system. This system, based on the Covariance Intersection algorithm, is scalable - its storage and computational costs are linearly proportional to the number of beacons in the map. Furthermore, it is scalable to multiple robots - each has complete freedom to exchange partial or full map information with any other robot at any other time step. We demonstrate the real-time performance of this system in a scenario of 15,000 beacons.

关键词： Robots Mobile robots Sensors algorithm development Process modeling Data fusion Filtering (signal processing) Robotics Computing systems Robotic systems

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Implementation and validation of atmospheric compensation algorithms for Multispectral Thermal Imager (MTI) pipeline processing

Implementation and validation of atmospheric compensation al...

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Conference on Propagation and Imaging through the Atmosphere IV

作者： Balick, LK Hirsch, KL McLachlan, PM Borel, CC Clodius, WB Villenueve, PV Univ Calif Los Alamos Natl Lab Space & Remote Sensing Sci Grp Los Alamos NM 87544 USA

ISBN: (纸本)0819437700

The Multispectral Thermal Imager (MTI) is a satellite system developed by the DoE. It has 10 spectral bands in the reflectance domain and 5 in the thermal LR. It is pointable and, at nadir, provides 5m IFOV in four visible and short near IR bands and 20m IFOV at longer wavelengths. Several of the bands in the reflectance domain were designed to enable quantitative compensation for aerosol effects and water vapor(daytime). These include 3 bands in and adjacent to the 940nm water vapor feature, a band at 1380nm for cirrus cloud detection and a SWIR band with small atmospheric effects. The concepts and development of these techniques have been described in detail at previous SPIE Conferences and in journals. This paper describes the adaptation of these algorithms to the MTI automated processing pipeline (standardized level 2 products) for retrieval of aerosol optical depth land subsequent compensation of reflectance bands for calibration to reflectance) and the atmospheric water vapor content (thermal IR compensation). Input data sources and flaw are described. Validation results are presented. Pre-launch validation was performed using images from the NASA AVIRIS hyperspectral imaging sensor flown in the stratosphere on NASA ER-2 aircraft compared to ground based sun photometer and radiosonde measurements from different sources. These data sets span a range of environmental conditions.

关键词： Reflectivity Vegetation Aerosols Atmospheric modeling Thermography algorithm development Atmospheric particles Absorption Image processing Sun

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