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Conference on Visual Data Exploration and Analysis VI

作者： El-Sana, J Varshney, A SUNY Stony Brook Dept Comp Sci Stony Brook NY 11794 USA

ISBN: (纸本)0819431141

This paper presents a parallel algorithm for preprocessing as well as real-time navigation of vie iv-dependent virtual environments on shared memory multiprocessors. The algorithm proceeds by hierarchical spatial subdivision of the input dataset by an octree: The parallel algorithm is robust and does not generate any artifacts such as degenerate triangles and mesh:foldovers. The algorithm performance scales linearly with increase in the number of processors as well as increase in the input dataset complexity. The resulting visualization performance is fast enough to enable interleaved acquisition and modification with interactive visualization.

关键词： Visualization Virtual reality Parallel processing Temporal coherence Submerged target modeling algorithm development Colon Computer graphics Lanthanum Light sources and illumination

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Modeling and simulation-based solutions for complex resource allocation problems

Modeling and simulation-based solutions for complex resource...

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Conference on Enabling Technology for Simulation Science III

作者： Cassandras, CG Gokbayrak, K Boston Univ Dept Mfg Engn Boston MA 02215 USA

ISBN: (纸本)0819431702

Resource allocation problems arise in application domains such as logistics, networking, manufacturing, and (CI)-I-4 systems. The discrete nature of resources to be allocated makes such problems combinatorially complex. In addition, uncertainties in the times when resources are requested and relinquished introduce additional complexities often necessitating the use of simulation for modeling and analysis purposes. In this paper, we present two approaches for solving such problems, the first based on ordinal optimization and the second on the idea of replacing the original discrete allocation problem by a "surrogate model" involving a continuous allocation problem. The latter is simpler to solve through gradient-based techniques and can be shown to recover the solutions of the original problem. Concurrent simulation is used to estimate the gradients required in this approach, leading to extremely fast solutions for many problems in practice.

关键词： Stochastic processes Statistical analysis Optimization (mathematics) algorithm development Computer simulations Manufacturing Lithium Monte Carlo methods Computer programming Systems modeling

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Effective dielectric function of mixtures of three or more materials:: a numerical procedure for computations.

Effective dielectric function of mixtures of three or more m...

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Conference on Advances in Optical Interference Coatings

作者： Bosch, S Ferré-Borrull, J Univ Barcelona Dept Fis Aplicada & Opt Lab Opt E-08028 Barcelona Spain

ISBN: (纸本)0819432121

A numerical procedure for solving the effective medium approximation equations for ellipsometric data analysis is presented. The idea is to transform the complex root-finding problem into a minimization task in real space. Thus, the method can be implemented through a standard downhill simplex algorithm, leading to a general, simple and useful technique for ellipsometric developments.

关键词： Dielectrics Interfaces Refractive index algorithm development Data modeling Standards development Data analysis Mathematical modeling Silica Spherical lenses

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Test results for a 32x32 PCNN array

Test results for a 32x32 PCNN array

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9th Workshop on Virtual Intelligence/Dynamic Neural Networks

作者： Johnson, JL Sims, SRF Branch, TW USA Aviat & Missile Command Missile Res Dev & Engn Ctr Redstone Arsenal AL 35898 USA

ISBN: (纸本)0819432024

Pulse coupled neural network (PCNN) algorithms for image preprocessing have minimal requirements for interconnects and essentially no memory requirements. They are an effective technique for rapid intensity segmentation and noise smoothing as an initial step in many image processing algorithms. A test array with 32x32 active PCNN pixels has been undergoing initial evaluation. Its performance is discussed and comparison with software versions of the PCNN algorithm is given.

关键词： Image processing algorithms and systems Missiles Neodymium Optical filtering Pulse generators Raster graphics algorithm development Evolutionary algorithms Image segmentation Neural networks

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Find that leak [digital signal processing approach]

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IEE Review 1999年第5期45卷 219-221页

作者： J. Golby T. Woodward CRL's DSP Group CRL Hayes Middlesex Thames Water's Research and Technology Group Reading

Digital signal processing can help cut losses from leaking water mains. The authors explain how one new development, sponsored by Thames Water, is helping it in the battle to locate leaks more quickly and reliably. From the outset their aim was to develop a 'virtual' instrument approach based on a standard personal computer (PC). In this way, as the knowledge base increases and further improvements are made, software upgrades can be implemented on the same hardware platform. The use of a standard commercially available sound card fits in with this approach. In practice the software development proceeded in two main stages: an initial programme of algorithm development, followed by real-time algorithm implementation and graphical user interface (GUI).

关键词： digital signal processing graphical user interface microcomputer applications virtual instrument Software engineering techniques software development Digital signal processing leak location water supply standard commercially available sound card Computerised instrumentation signal processing equipment Public utilities Graphical user interfaces leaking water mains software engineering algorithm development graphical user interfaces real-time algorithm implementation PC Signal processing and conditioning equipment and techniques Thames Water personal computer hardware platform Signal processing and detection acoustic signal processing GUI software upgrades

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development of an algorithm for the analysis of surface defects in mechanical elements

Development of an algorithm for the analysis of surface defe...

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Conference on Machine Vision Systems for Inspection and Metrology VII

作者： Fargione, G Geraci, AL Pennisi, L Risitano, A Univ Catania Fac Ingn Meccan Ist Macchine I-95125 Catania Italy

ISBN: (纸本)0819429821

The non-destructive tests (NDT) allow to establish the physical and structural conditions of a mechanical part, to verify its condition, the superficial wear and tear and then evaluate its "remaining" efficiency. The non-destructive tests are applied in all those fields of engineering in which the determination of the mechanical and structural characteristics of elements in use is requested, without making them undergo destructive or damaging tests. In the present work an application program has been developed which, examining the surface of mechanical parts under an optical microscope and a blaster video, is able to characterise the material and to recognise and identify the possible presence of a superficial crack. The program constitutes the first step towards the realisation of an industrial prototype which, thanks to the utilisation of a plan moved by step-by-step motors, allows the scanning of the whole surface of a part and the recognition of the crack in an automatic way, that is without the presence of an operator, and its characterisation, in case it is identified, through the determination of some geometric parameters useful to ascertain the structural integrity of the element under examination. For the realisation of the program different techniques of image analysis have been applied and the use of an artificial neural network preset for the recognition of the crack has been necessary. The program has been realised in C language and it works in Linux system.

关键词： Image processing Image segmentation Image analysis Light sources and illumination Nondestructive evaluation algorithm development Neural networks Hough transforms Digital imaging Image acquisition

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Coherently three-dimensional wavelet-based approach to volumetric image compression

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JOURNAL OF ELECTRONIC IMAGING 1998年第3期7卷 474-485页

作者： Luo, JB Eastman Kodak Co Imaging Res & Adv Dev Rochester NY 14650 USA Univ Missouri Dept Elect Engn Columbia MO 65211 USA

Compression of three-dimensional (3D) or four-dimensional medical image data has now become imperative for clinical picture archiving and communication systems (PACS), telemedicine, and telepresence networks. While lossless compression is often desired, lossy compression techniques are gaining acceptance for medical applications, provided that clinically important information can be preserved in the coding process. We present a coherently three-dimensional method for volumetric image compression using 3D wavelet transform and 3D zerotree coding. First the volumetric image data is decomposed using 3D separable wavelet filterbanks. In this study, we adopt a three-level decomposition to form a 22-band multiresolution pyramid of an octree. Then, to exploit the dependencies among the subband coefficients resulting from 3D wavelet decomposition, a 3D zerotree coding scheme is utilized. To take advantage of the near-Laplacian distributions of the subband coefficients and the efficiency of zerotree coding, a pseudouniform quantization is adopted. The proposed volumetric image compression scheme is applied to two sets of real CT medical data. Significant coding gains have been achieved which demonstrate the effectiveness of the proposed volumetric image compression scheme for medical as well as other applications. (C) 1998 SPIE and IS&T. [S1017-9909(98)02703-2].

关键词： Image compression 3D image processing Quantization Wavelets Image filtering Wavelet transforms algorithm development Lithium Medical imaging Reconstruction algorithms

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Check image compression using a layered coding method

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JOURNAL OF ELECTRONIC IMAGING 1998年第3期7卷 426-442页

作者： Huang, JC Wang, Y Wong, EK Polytech Univ Dept Elect Engn Brooklyn NY 11201 USA Polytech Univ Dept Comp & Informat Sci Brooklyn NY 11201 USA

An emerging trend in the banking industry is to digitize checks for storage and transmission. An immediate requirement for efficient storage and transmission is check image compression. General purpose compression algorithms such as JPEG and wavelet-based methods produce annoying ringing or blocking artifacts at high compression ratios, in this paper, a layered approach to check image compression is proposed in which a check image is represented in several layers. The first layer describes the foreground map;the second layer specifies the gray levels of foreground pixels;the third layer is a lossy representation of the background image;and the fourth layer describes the error between the original and the reconstructed image of the first three layers. The layered coding approach produces images of better quality than traditional JPEG and wavelet coding methods, especially in the foreground, i.e., the text and graphics, in addition, this approach allows progressive retrieval or transmission of different image layers. (C) 1998 SPIE and IS&T. [S1017-9909(98)01403-2].

关键词： Image compression Image segmentation Image quality Chromium Visualization Binary data Image processing algorithms and systems Image processing algorithm development Wavelets

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Application-specific image compression for multimedia applications

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JOURNAL OF ELECTRONIC IMAGING 1998年第3期7卷 464-473页

作者： Moni, S Cadence Design Syst Sunnyvale CA 94086 USA USN Air Warfare Ctr Weap Div China Lake CA 93555 USA

In order to establish a synergy between the compression scheme and the intended processing of the compressed image, we develop a family of compression algorithms that can adapt to the specialized requirements imposed by the application. The focus of this work is on wavelet-based compression for still images. A family of eight compression schemes is proposed to address specialized multimedia requirements such as (i) partial evaluation of wavelet coefficients, (ii) asymptotic losslessness of the algorithms, (iii) tree-structure in the selected coefficients, and (iv) optimization of either energy compaction or coefficient retention. Experimental results, including fraction of coefficients evaluated, rate-distortion performance, and coefficient retention are presented. (C) 1998 SPIE and IS&T. [S1017-9909(98)00503-0].

关键词： Image compression Computer programming Wavelets Multimedia Quantization Databases algorithm development Visualization Image processing Telemedicine

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Block-matching algorithm based on dynamic adjustment of search window for low bit-rate video coding

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JOURNAL OF ELECTRONIC IMAGING 1998年第3期7卷 571-577页

作者： Oh, HS Lee, HK Korea Adv Inst Sci & Technol Dept Comp Sci Taejon 305701 South Korea

A dynamic search window adjustment for block-matching algorithm (BMA) based on the block similarity is presented to reduce the computational complexity of full search BMA. The adjustment of the size of the search window is performed in three steps: (1) set a new search origin based on the block similarity and the displaced block difference (DBD), (2) adjust the size of search window in inverse proportion to block similarity, and (3) update the thresholds for accommodation to a given image sequence. The technique can be easily applied to full search BMA and several fast search algorithms to get more efficiency and to reduce a possibility of falling into a local minimum. Experimental results show that the proposed technique has a good MSE performance and reduces the number of search points substantially. (C) 1998 SPIE and IS&T. [S1017-9909(98)02303-4].

关键词： Video Image segmentation Video coding Image processing algorithms and systems Distortion algorithm development Motion estimation Computer science Computer simulations

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