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检索条件"任意字段=Image Processing: Algorithms and Systems V"

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Implementation and analysis of an optimized rainfalling watershed algorithm

Implementation and analysis of an optimized rainfalling wate...

引用

image and video Communications and processing 2000

作者： De Smet, Patrick Pires, Rui Luis v.P.M. Univ of Ghent Gent Belgium

In this paper we discuss a new implementation of a floating point based rainfalling watershed algorithm. First, we analyze and compare our proposed algorithm and its implementation with two implementations based on the well-known discrete vincent-Soille flooding watershed algorithms. Next, we show that by carefully designing and optimizing our algorithm a memory (bandwidth) efficient and high speed implementation can be realized. We report on timing and memory usage results for different compiler settings, computer systems and algorithmic parameters. Our optimized implementation turns out to be significantly faster than the two vincent-Soille based implementations with which we compare. Finally, we include some segmentation results to illustrate that visually acceptable and almost identical segmentation results can always be obtained for all algorithms being compared. And, we also explain how, in combination with other pre- or post-processing techniques, the problem of oversegmentation (a typical problem of all raw watershed algorithms) can be (partially) overcome. All these properties make that our proposed implementation is an excellent candidate for use in various practical applications where high speed performance and/or efficient memory usage is needed.

关键词： image segmentation

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Experimental determination of drosophila embryonic coordinates by genetic algorithms, the simplex method, and their hybrid

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EvoWorkshops 2000: 2nd European Workshop on Evolutionary Computation in image Analysis and Signal processing, EvoIASP 2000, 1st European Workshop on Evolutionary Computation in systems, Control and Drives in Industry, Evo-SCONDI 2000, 2nd European Workshop on Evolutionary Telecommunications, EvoTel 2000, 1st European Workshop on Evolutionary Scheduling and Timetabling, EvoStim 2000, 3rd European Workshop on Evolutionary Robotics, EvoRob 2000 and 1st European Workshop on Evolutionary Aeronautics, EvoFlight 2000 held in conjunction with European Conference on Genetic Programming, EuroGP 2000 and 3rd International Conference on Evolvable systems, ICES 2000

作者： Spirov, Alexander v. Timakin, Dmitry L. Reinitz, John Kosman, David The Sechenov Institute of Evolutionary Physiology and Biochemistry 44 Thorez Ave St Petersburg194223 Russia Dept. of Automation and Control Systems Polytechnic University 29 Polytechnic St St Petersburg194064 Russia Dept. of Biochemistry and Molecular Biology Sinai Medical School Box 1020 Mt. One Gustave L. Levy Place New YorkNY10029 United States

ISBN: (纸本)3540673539

Modern large-scale "functional genomics" projects are inconceivable without the automated processing and computer-aided analysis of images. The project we are engaged in is aimed at the construction of heuristic models of segment determination in the fruit fly Drosophila melanogaster. The current emphasis in our work is the automated transformation of gene expression data in confocally scanned images into an electronic database of expression. We have developed and tested programs which use genetic algorithms for the elastic deformation of such images. In addition, genetic algorithms and the simplex method, both separately and in concert, were used for experimental determination of Drosophila embryonic curvilinear coordinates. Comparative tests demonstrate that the hybrid approach performs best. The intrinsic curvilinear coordinates of the embryo found by our optimization procedures appear to be well approximated by lines of isoconcentration of a known morphogen, Bicoid. © Springer-verlag Berlin Heidelberg 2000.

关键词： Genetic algorithms

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video switching and sensor fusion for multi-camera sensing systems

Video switching and sensor fusion for multi-camera sensing s...

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Conference on Intelligent Robots and Computer vision XIX: algorithms, Techniques, and Active vision

作者： Saxena, M Selvaraj, v Dhareshwar, R Hall, EL Univ Cincinnati Ctr Robot RES Cincinnati OH 45221 USA

ISBN: (纸本)0819438626

With the low cost of solid-state camera systems, it is now possible to include many cameras on a mobile robot or other machine. However, video processing is still relatively expensive. Therefore it is often desirable to share several cameras with a single processor. The purpose of this paper is to describe the design of a video switching system that permits eight cameras to be multiplexed with a single chip. Multiples of eight could also easily be accomplished. The heart of the system is a Maxim video switch. The user simply selects using a three-bit control signal, which camera signal is selected. The output of the video switch is then the desired camera image. One application of this video switch is a four camera input system to a mobile robot being constructed at the University of Cincinnati. Other applications include surveillance and other mobile systems. The decision as to which camera to observe can be made automatically from a computer providing a great versatility. For example, supplemental motion detectors could be used to activate the camera selection for a surveillance system. Higher-level logic has been used on our mobile robot application. Still higher-level logic could be used to fuse the video information in various ways before processing. The significance of this device is that it provides a wealth of video information to be used at the discretion of either a human viewer or automatic system.

关键词： computer vision video switching multiplexing mobile robot

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Turbo multiuser detection for coded DS-CDMA systems:: A Gibbs sampling approach

Turbo multiuser detection for coded DS-CDMA systems:: A Gibb...

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34th Asilomar Conference on Signals, systems, and Computers

作者： Buchoux, v Cappé, O Moulines, E ENST Signal & Image Proc Lab TSI Dpt F-75634 Paris 13 France

ISBN: (纸本)0780365143

This paper deals with joint detection and decoding techniques for coded CDMA (Code Division Multiple Access) systems. A promising approach in this context consists of combining the results of a soft output multiuser detector (MUD) with single user soft-input soft-output (SISO) decoders in an iterative fashion (so called "turbo" principle). In a first part of the paper we describe the CDMA channel under the form of a probabilistic graphical model (also known as Bayesian, or belief network) which provides a very generic and natural way of deriving turbo algorithms. The structure of the algorithm is then obtained by direct application of general probability propagation rules rather than by using the context dependent notions of intrinsic and extrinsic information. It turns out however that the obtained algorithm still requires soft output multiuser detection in a pseudo model where the symbols emitted by the user are a priori independent which is not computationally feasible. The second part of the paper describes a simulation based MUD scheme which draws upon recent advances in Markov Chain Monte Carlo methods: The performance of the overall turbo multiuser decoder is compared with that of a state-of-the-art algorithm with comparable computational cost.

关键词： CDMA Gibbs sampler Graphical models Markov chain monte carlo Multiuser detection Rao-Blackwellization Turbo decoding

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Captive flight test-based infrared validation of a hardware-in-the-loop simulation

Captive flight test-based infrared validation of a hardware-...

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5th Conference on Technologies for Synthetic Environments - Hardware-in-the-Loop Testing

作者： Sanders, J Roland, R Cosby, D Saylor, D Harrison, K Simulat Technol Huntsville AL 35805 USA

ISBN: (纸本)0819436534

This paper describes infrared (IR) scene generation and validation activities at the U.S. Army Aviation and Missile Command's (AMCOM) Dual-Mode Hardware-in-the-Loop (HWIL) Simulation. The HWIL simulation validation results are based on comparison of infrared seeker data collected in the HWIL simulation to infrared seeker data collected during captive flight tests (CFTs). Use of CFT data allows a simulation developer to quantify not only the radiometric fidelity of the simulation inputs, but also the effects that any limitations of the inputs may have on simulation validity with respect to a particular seeker and its algorithms. validation of this type of simulation is a complex process and all aspects of the validation are covered. Topics include real-time IR signature modeling and validation, simulation output verification, projected energy verification, and total end-to-end simulation validation. Also included are descriptions of the different types of CFT scenarios necessary for simulation validation and the comparison methodologies used for each case.

关键词： Computer simulations Data modeling Process modeling Black bodies image processing Projection systems Temperature metrology systems modeling Infrared signatures Infrared radiation

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Integrating digitized imaging and stochastic modeling for pipeline management

Integrating digitized imaging and stochastic modeling for pi...

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2000 Annual Conference - Canadian Society for Civil Engineering

作者： McKim, R.A. Kathula, v.S. Sinha, S.K. Department of Civil Engineering Louisiana Tech University Ruston LA United States Department of Civil Engineering University of Waterloo Ont. Canada

ISBN: (纸本)0921303912

The aging sanitary sewer systems of North America are compelling municipalities to consider taking pro-active steps to anticipate rehabilitation needs of sewer pipes rather than reacting to crisis repairs. Effective and economical management of a pipeline system involves the assessment of its present structural condition, and the successful prediction of its service condition to meet present and future demands. An effective condition prediction model will allow the utility manger to optimize their capital and maintenance budgets by identifying when a repair or replacement is economically justified. Sinha (Sinha, et. al, 1999), has developed an automatic assessment system using the digitized data provided by the recently developed Sewer Scanner and Evaluation Technology (SSET) camera. Automated condition assessments can synthesized with the condition prediction model developed by Kathula (Kathula, et. al, 1999) at the Trenchless Technology Center of Louisiana Tech University. This paper will look at the potential integration of the digital image processing algorithms developed for the detection of defects, the artificial intelligence techniques for classification of these defects, the Markov chain probability based method for condition prediction, and the computing platform for integrating these systems.

关键词： Water distribution systems

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Compression method for real-time systems of remote sensing

Compression method for real-time systems of remote sensing

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International Conference on Pattern Recognition

作者： M. Gashnikov N. Glumov v. Sergeyev Imabe Processing Systems Institute USA

ISBN: (纸本)0769507506

In this paper the method of image compression is presented. It is designed for data processing in real-time systems of remote sensing. In the midpoint there are compression algorithm based on component transformation with pixel interpolation and algorithm of stabilization of encoded image forming speed, which provide high compression ratio, stable speed of an output data flow and controlled error of image reconstruction.

关键词： Real time systems Remote sensing image coding Process design Data processing Compression algorithms Pixel Interpolation Error correction image reconstruction

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Integration of image processing and Database Management systems

Integration of Image Processing and Database Management Syst...

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ICIG’2000 First International Conference on image and Graphics--image and Graphic Technology Toward 21st Century and Beyond

作者： N.S.MERZLYAKOv v.N.KARNAUKHOv L.I.RUBANOv Institute for Information Transmission Problems Russian Academy of Sciences 19 Bolshoi Karetny per. Moscow 101447 GSP4 Russia Institute for Information Transmission Problems Russian Academy of Sciences 19 Bolshoi Karetny per. Moscow 101447 GSP4 Russia Institute for Information Transmission Problems Russian Academy of Sciences 19 Bolshoi Karetny per. Moscow 101447 GSP4 Russia

This article summarizes the results of our research aimed to the development of methods, algorithms, and software for image acquisition, digital processing, and creation of textual-graphical databases of archival photo-documents and an integrated system for processing and archiving of photo-documents. The developed methods, algorithms, and software tools were successfully tested under creation of textual-graphical databases. These databases have started the conversion process of unique collections accumulated and stored at the different organizations of the Russian Academy of Sciences into the digital form.

关键词： Digital image processing, Textual-Graphical Database, Relational Database

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Initialised eigenlip estimator for fast lip tracking using linear regression

Initialised eigenlip estimator for fast lip tracking using l...

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International Conference on Pattern Recognition

作者： S. Lucey S. Sridharan v. Chandran Speeech Research Laboratory RCSAVT School of Electrical and Electronic Systems Engineeing Queensland University of Technology Brisbane Australia

ISBN: (纸本)0769507506

Multimodal speech processing in which visual facial features are jointly processed with audio features is a rapidly advancing field. Lip movements and configurations provide useful information to improve speech and speaker recognition. However, the use of this visual information requires accurate and fast lip tracking algorithms. A new technique is outlined that is able to estimate the outer lip contour directly from a given lip intensity image via linear regression. This estimate can be improved by a active shape model that is able to track a speakers lips without requiring time consuming iterative energy minimization techniques. Results of performance are presented against known tracking algorithms using the M2vTS database.

关键词： Linear regression Lips Principal component analysis Active shape model Speech processing Speech recognition Cameras systems engineering and theory Australia Iterative algorithms

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image compression via tritree decomposition

Image compression via tritree decomposition

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Brazilian Symposium on Computer Graphics and image processing (SIBGRAPI)

作者： v.C. Da Silva J.M. De Carvalho Departamento de Engenharia Elétrica University Fed. da Paraíba Campina Grande Paraiba Brazil

The work presents a new method for image compression, using tritree decomposition (TT). TT was originally proposed by Wille (1992) for generation of non-structured finite element meshes for numerical solution of differential equation systems. TT decomposition is similar to quadtree decomposition (QT), which has been broadly used by image processing algorithms, mainly for segmentation and compression. However, while QT subdivides the image into progressively smaller quadratic regions, TT decomposition subdivides the image into triangular regions. The goal is to segment the image into a set of triangular homogeneous regions, where the differences among the pixel values don't exceed a certain threshold. A tree is built to represent the decomposition. Each triangle will be a node of the tree TT. The initial triangle, that contains the whole image, is the root of the tree. The final triangles, representing the compressed image, are the leaves of the tree. Reconstruction of the image is accomplished by planar interpolation among the vertices of each triangular leaf.

关键词： image coding PSNR Finite element methods image segmentation image reconstruction Differential equations image processing Pixel Interpolation Bit rate

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