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检索条件"主题词=Algorithm Development"

共 1737 条记录，以下是371-380 订阅

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Two-level domain decomposition algorithm for a nonlinear inverse DOT problem

Two-level domain decomposition algorithm for a nonlinear inv...

引用

Conference on Optical Tomography and Spectroscopy of Tissue VI

作者： Kwon, K Son, IY Yazici, B Rensselaer Polytech Inst Troy NY 12181 USA

ISBN: (纸本)0819456675

Diffuse optical tomography (DOT) in the near infrared involves reconstruction of spatially varying optical properties of turbid medium from boundary measurements based on a forward model of photon propagation. Due to highly non-linear nature of the DOT, high quality image reconstruction is a computationally demanding problem that requires repeated solutions of both the forward and the inverse problems. Therefore, it is highly desirable to develop methods and algorithms that are computationally efficient. In this paper, we propose a domain decomposition approach to address the computational complexity of the DOT problem. We propose a two-level multiplicative overlapping domain decomposition method for the forward problem and a two-level space decomposition method for the inverse problem. We showed the convergence of the inverse solver and derived the computational complexity of each method. We demonstrate the performance of the proposed approach in numerical simulations.

关键词： Sensors Chemical elements Inverse optics Detection and tracking algorithms Reconstruction algorithms algorithm development Diffusion Image quality Inverse problems Neon

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ADAPTIVE WEIGHTED MEDIAN PREDICTIVE CODING OF IMAGES 4

ADAPTIVE WEIGHTED MEDIAN PREDICTIVE CODING OF IMAGES

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4TH CONF ON NONLINEAR IMAGE PROCESSING

作者： SONG, XD YIN, L NEUVO, Y Tampere Univ. of Technology (Finland)

ISBN: (纸本)0819411353

In linear predictive coding, especially in adaptive linear predictive coding, channel errors tend to propagate destroying significant portions of an image. In this paper, an adaptive weighted median predictive coding scheme which is robust against channel errors is proposed. Neither overhead information nor error correction coding is needed. The scheme is applied to real images and is shown to provide much improved performance at high bit error rates (BER).

关键词： Aluminium phosphide Image compression Nonlinear image processing Digital filtering algorithm development Binary data Electrical engineering Forward error correction Modulation Optimal filtering

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An overview of Neural Network applications for soil moisture retrieval from radar satellite sensors 14

An overview of Neural Network applications for soil moisture...

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Conference on SAR Image Analysis, Modeling, and Techniques XIV

作者： Santi, E. Paloscia, S. Pettinato, S. CNR IFAC Florence Italy

ISBN: (纸本)9781628413069

Frequent and spatially distributed measurements of soil moisture (SMC), at different spatial scales, are advisable for all applications related to the environmental disciplines, such as climatology, meteorology, hydrology and agriculture. Satellite sensors operating in the low part of microwave spectrum are very suitable for this purpose, and their signals can be directly related to the moisture content of the observed surfaces, provided that all the contributions from soil and vegetation to the measured signal are properly accounted for. Among the algorithms used for the retrieval of SMC from both active (i.e. Synthetic Aperture Radar, SAR or real aperture radars) and passive (radiometers) microwave sensors, the artificial neural networks (ANN) represent the best compromise between accuracy and computation speed. ANN based algorithms have been developed at IFAC, and adapted to several radar and radiometric satellite sensors, in order to generate SMC products at different spatial resolutions, varying from hundreds of meters to tens of kilometers. These algorithms, which use the ANN techniques for inverting theoretical and semi-empirical models, such as Advanced Integral Equation (AIEM), Oh models, and Radiative transfer Theory (RTT), have been adapted to the C-band acquisitions from SAR (Envisat/ASAR) and real aperture radar (ASCAT) and to the X-band SAR acquisitions of Cosmo-SkyMed and TerraSAR-X. Moreover, a specific ANN algorithm has also been implemented for the L-band active and passive acquisitions of the incoming SMAP mission. The latter satellite will carry onboard simultaneously one radar and one radiometer operating at the same frequency, but with different spatial resolutions (3 and 40 km, respectively). Large datasets of co-located satellite acquisitions and direct SMC measurements on several test sites located worldwide have been used along with simulations derived from forward electromagnetic models for setting up, training and validating these algorit

关键词： Soil science Radar Satellites Polarization Synthetic aperture radar algorithm development Data modeling Vegetation Sensors Microwave radiation

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AUTOMATIC TRANSPUTER CODE GENERATION FOR FLEXIBLE REAL-TIME VISION SYSTEMS

AUTOMATIC TRANSPUTER CODE GENERATION FOR FLEXIBLE REAL-TIME ...

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CONF ON MACHINE VISION APPLICATIONS, ARCHITECTURES, AND SYSTEMS INTEGRATION

作者： SCHWINGSHAKL, G POLZLEITNER, W Joanneum Research (Austria)

ISBN: (纸本)0819410241

In this paper we describe the major aspects in our transputer-based automatic vision system aiming to implement a scaleable and easily reconfigurable system. In this system the mapping of image processing and recognition algorithms to the hardware is facilitated by automatic code generation schemes, separating methodic design and implementation details.

关键词： Image processing Detection and tracking algorithms Pattern recognition algorithm development Feature extraction Image segmentation Image classification Classification systems Image processing algorithms and systems Telecommunications

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CONCURRENT IMAGE-PROCESSING ON HYPERCUBE MULTICOMPUTERS

CONCURRENT IMAGE-PROCESSING ON HYPERCUBE MULTICOMPUTERS

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CONF ON PARALLEL ARCHITECTURES FOR IMAGE PROCESSING

作者： GHOSH, J Univ. of Texas/Austin (United States)

ISBN: (纸本)0819402931

This paper presents a simple and effective method for the concurrent manipulation of linearly ordered data structures on hypercube systems, and extends it to cater to multidimensional images. The method is based on the existence of a binomial search tree rooted at any arbitrary processor node of the hypercube such that (i) every edge of the tree corresponds to a direct link between a pair of hypercube nodes, and (ii) it spans any arbitrary sequence of n consecutive nodes as specified by a gray code ordering, using a fan-out of at most [log₂n] and a depth of ([log₂n] + 1) . The search trees spanning different processor lists are vertex disjoint and are formed dynamically and concurrently, They can be specified using information local to each node. Thus, they can be used for performing operations such as broadcast and merge simultaneously on image components with non-uniform sizes. The concurrent search reduces the complexity of several low and intermediate-level image processing algorithms to depend on the size of the largest image segment rather than the size of the entire image.

关键词： Image processing Image segmentation algorithm development algorithms Binary data Image processing algorithms and systems Image filtering Visualization Thermography Computer engineering

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Contour-based progressive coding of cutting plane data

Contour-based progressive coding of cutting plane data

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Conference on Visualization and Data Analysis 2002

作者： Guan, Y Moorhead, RJ Mississippi State Univ NSF Engn Res Ctr Starkville MS 39759 USA

ISBN: (纸本)0819444057

We present an efficient algorithm for progressive coding of cutting plane data extracted from large-scale computational field simulation (CFS) datasets. Since cutting planes are frequently used for examination of 3D simulation results, efficient compression of their geometry, topography, and the associated field data is important for good visualization performance, especially when the simulation is running on a geographically remote server or the simulation results are stored in a remote repository. Progressive coding is ideal for exploratory visualization since the data can be presented naturally starting with a coarse view and progressing down to the detail. In our algorithm, each cutting plane is reduced at the server to a set of triangle strips containing contour lines. On the local visualization machine (the client), the original surface is reconstructed by triangulating the space between the triangle strips. The more contour lines used, the higher the reconstruction accuracy obtained. It can quickly show an area of interest without modifying that section of the original triangle mesh. In generating the data to be sent to the client, the algorithm can smoothly trade-off computation and the accuracy of the representation by altering the cutting plane generation procedure or by adjusting the accuracy of the data.

关键词： Visualization Signal to noise ratio Phase modulation Visual compression Chromium Computer simulations Reconstruction algorithms algorithm development Transform theory Data centers

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HIGH-RESOLUTION ANISOTROPIC 3D EDGE DETECTOR FOR MEDICAL IMAGES

HIGH-RESOLUTION ANISOTROPIC 3D EDGE DETECTOR FOR MEDICAL IMA...

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Conference on Image Processing

作者： LIOU, SP SINGH, A SIEMENS CORP RES INC DEPT IMAGINGPRINCETONNJ 08540

ISBN: (纸本)081941462X

Advances in sensor and computer technology are resulting in an increased use of three-dimensional images in medical diagnosis. Three dimensional edge detection provides 3D anatomical representation that aids in planning and executing certain surgical procedures as well as in registering images of different modalities. Existing 3D edge detectors are 3D generalizations of 2D edge detectors. Most have limited resolution in boundary representation (subject to the resolution of imaging modality) and limited ability to directly deal with anisotropic sampling which occurs frequently in medical images. This paper presents a formal formulation of the 3D edge detection problem for anisotropically sampled images. Our approach differs from the previous approaches in the following ways: (1) a 3D edge detector is developed for data on anisotropic grids, (2) a modified version of the marching cube algorithm is used to locate the zero-crossings of the second-order derivatives, and (3) a connected component algorithm is developed for grouping zero- crossing surfaces into a set of disjoint surfaces. We show experimental results on many clinically acquired CT and MR images.

关键词： 3D image processing Sensors algorithm development Edge detection Detection and tracking algorithms Image processing Medical imaging Image resolution Computed tomography Image sensors

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A Super-resolution algorithm for Enhancement of FLASH LIDAR Data: Flight Test Results

A Super-resolution Algorithm for Enhancement of FLASH LIDAR ...

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Conference on Computational Imaging XII

作者： Bulyshev, Alexander Amzajerdian, Farzin Roback, Eric Reisse, Robert Analyt Mech Associates Inc Hampton VA 23666 USA NASA Langley Res Ctr Hampton VA 23681 USA

ISBN: (纸本)9780819499370

This paper describes the results of a 3D super-resolution algorithm applied to the range data obtained from a recent Flash Lidar helicopter flight test. The flight test was conducted by the NASA's Autonomous Landing and Hazard Avoidance Technology (ALHAT) project over a simulated lunar terrain facility at NASA Kennedy Space Center. ALHAT is developing the technology for safe autonomous landing on the surface of celestial bodies: Moon, Mars, asteroids. One of the test objectives was to verify the ability of 3D super-resolution technique to generate high resolution digital elevation models (DEMs) and to determine time resolved relative positions and orientations of the vehicle. 3D super-resolution algorithm was developed earlier and tested in computational modeling, and laboratory experiments, and in a few dynamic experiments using a moving truck. Prior to the helicopter flight test campaign, a 100mX100m hazard field was constructed having most of the relevant extraterrestrial hazard: slopes, rocks, and craters with different sizes. Data were collected during the flight and then processed by the super-resolution code. The detailed DEM of the hazard field was constructed using independent measurement to be used for comparison. ALHAT navigation system data were used to verify abilities of super-resolution method to provide accurate relative navigation information. Namely, the 6 degree of freedom state vector of the instrument as a function of time was restored from super-resolution data. The results of comparisons show that the super-resolution method can construct high quality DEMs and allows for identifying hazards like rocks and craters within the accordance of ALHAT requirements.

关键词： LIDAR Super resolution 3D image processing algorithm development Image processing 3D modeling Detection and tracking algorithms Spatial resolution Navigation systems Pulsed laser operation

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Pendulum walker

Pendulum walker

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Conference on Unmanned Systems Technology IX

作者： Muenchl, Paul Marecki, Alexander USA REDECOM TARDEC 6501 E 11 Mile Rd Warren MI 48397 USA

ISBN: (纸本)9780819466839

Picture someone walking from left to right. During one step (intra-step) we treat them as a simple pendulum. This model is called the rimless wheel in the literature. We analyze this model intra-step using dynamic programming to find the optimum energy profile based on time and energy cost. We then analyze the problem inter-step for the ideal stepsize based on time cost alone, i.e., without foot collision (energy) losses.

关键词： Computer programming algorithm development Logic Clocks Head Liquid crystal on silicon Magnesium Mathematics Unmanned systems

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Stochastic Functional Central Limit Theorems with Applications to Control of Uncertain Systems 21

Stochastic Functional Central Limit Theorems with Applicatio...

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Conference on Unmanned Systems Technology XXI

作者： Chen, Xinjia Northwestern State Univ Louisiana Dept Engn Technol Natchitoches LA 71497 USA

ISBN: (数字)9781510627086

ISBN: (纸本)9781510627086

A persistent concern of control engineering is the performance of systems in the presence of uncertainty. In this paper, we consider uncertainties affecting systems as stochastic processes of independent stationary increments. We show that in many situations the performance of an uncertain system can be measured by a function of a parametric stopping time and associated values of stochastic processes. Under some mild regularity conditions, we demonstrate that the performance measure is governed by stochastic functional central limit theorems as the parameters of the stopping time tend to certain values. Such results can be applied to the analysis and design of control systems affected by uncertainties.

关键词： Stochastic processes Control systems Statistical analysis Control systems design Matrices Computer simulations algorithm development Device simulation Performance modeling Systems modeling

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