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The parallel iterative closest point algorithm

The parallel iterative closest point algorithm

引用

International conference on 3D Imaging, Modeling, processing, Visualization and Transmission (3DIMPVT)

作者： C. Langis M. Greenspan G. Godin Visual Information Technology Group Institute for Information Technology National Research Council Canada Ottawa ONT Canada

ISBN: (纸本)0769509843

This paper describes a parallel implementation developed to improve the time performance of the Iterative Closest Point Algorithm. Within each iteration, the correspondence calculations are distributed among the processor resources. At the end of each iteration, the results of the correspondence determination are communicated back to a central processor and the current transformation is calculated A number of additional techniques were developed that served to improve upon this basic scheme. Calculating the partial sums within each distributed resource made it unnecessary to transmit the correspondence values back to the central processor, which reduced the communication overhead, and improved time performance. Randomly distributing the points among the processor resources resulted in a better load balancing, which further improved time performance. We also found that thinning the image by randomly removing a certain percentage of the points did not improve the performance, when viewed as the progression of mse with time. The method was implemented and tested on a 22 node Beowulf class cluster. For a large image, linear performance improvements were obtained for up to 16 processors, while they held for up to 8 processors with a smaller image.

关键词： Iterative closest point algorithm Information technology Data processing Councils Load management Testing Registers Inspection Mean square error methods Data acquisition

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An optimal software-pipelining method for instruction-level parallel processors based on scaled retiming

An optimal software-pipelining method for instruction-level ...

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International Symposium on image and Signal processing and Analysis

作者： F. Fernandez A. Sanchez A. Duarte Dept. Fotónica FI-UPM Campus Montegancedo Madrid Spain ESCET-URJC Campus de Móstoles Madrid Spain

ISBN: (纸本)9539676940

Software pipelining is an instruction-level loop scheduling method for achieving high performance fine-grain parallelism on VLIW (very long instruction word) processors. This paper presents a novel software pipelining method for non-pipelining parallel processors based on integer scaling and retiming transformations. This approach generalises and simplifies the analogous extended retiming model of T.W. O'Neil et al. (see Proc. ISCA 12th Int. Conf. parallel & distributed Computing Syst., p.292-7, 1999; Proc. of ICASSP'99 Conf., vol.4 p.2001-4, 1999). Matrix techniques are used in order to simplify the corresponding graph transformations. Some general properties taken from algebraic graph theory are applied in order to obtain general scheduling techniques: node and cycle methods. The two-phase scheduling method considered is first defined by means of two standard linear programming problems. We transform the corresponding problems into some variants of the maximum cost-to-time ratio problem and shortest path problem, in order to obtain efficient polynomial time algorithms. An example of software pipelining optimization of a digital correlator is also given.

关键词： Pipeline processing Processor scheduling VLIW Software performance parallel processing distributed computing Graph theory Linear programming Shortest path problem Polynomials

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An efficient parallel algorithm for high resolution color image reconstruction 7

An efficient parallel algorithm for high resolution color im...

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7th International conference on parallel and distributed Systems Workshops (ICPADS 2000)

作者： Ng, MK Univ Hong Kong Dept Math Hong Kong Hong Kong Peoples R China

ISBN: (纸本)0769505716

This paper studies the application of preconditioned conjugate gradient methods in high resolution color image reconstruction problems. The high resolution color images are reconstructed from multiple undersampled, shifted, degraded color frames with subpixel displacements. The resulting degradation matrices are spatially variant. The preconditioners are derived by taking the cosine transform approximation of the degradation matrices. The resulting preconditioning matrices allow the use of fast transform methods. We show how the methods can be implemented on parallel computers, and toe demonstrate thee's parallel efficiency using experiments on a sixteen processor IBM SP-2.

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Compass: An image retrieval system for distributed databases

Compass: An image retrieval system for distributed databases

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1st IEEE International conference on Multimedia and Expo (ICME2000)

作者： Brunelli, R Mich, O ITC IRST I-38050 Trent Italy

ISBN: (纸本)0780365364

A currently relevant research held in information sciences is the management of non-traditional distributed multimedia databases, Three related key issues are achieving an effective content-based query by example retrieval, a fast response time and adapting image comparison strategies to user needs. This paper presents COMPASS, a distributed image retrieval system which provides novel solutions to these key issues. Statistical methods are used to quantify image descriptor effectiveness, to simplify user queries and to select an image comparison strategy which optimizes search speed while preserving answer quality.

关键词： image retrieval

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Tracking the attitude of an aircraft with a single imaging sensor using numerical optimization-based methods

Tracking the attitude of an aircraft with a single imaging s...

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4th International conference on parallel and distributed methods for image processing IV

作者： Park, Y Shin, S Chun, J Agcy Def Dev Taejon 305600 South Korea

ISBN: (纸本)0819437638

We shall show how to extract various important information on the motion of a target (enemy aircraft) from a sequence of its image frames obtained using a single imaging sensor which is mounted on an aircraft. Specifically, we present an algorithm which estimates following 12 parameters of an enemy aircraft from its image sequence;position (three), linear velocity (three), attitude (three), instantaneous angular velocity (three) and optional acceleration (three). To extract the attitude, we use a matching algorithm for the captured image frame to the modeled image. The objective function is the value of correlation between these two images, and we use simulated annealing and downhill simplex methods for maximizing the objective function. Finally, estimation of the position and the attitude is accomplished with a 12-state extended Kalman filter. Through simulations, we show that the proposed algorithm is superior to conventional algorithms which do not use the attitude information.

关键词： Target Tracking simulated annealing Euler angles Kalman filter

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Optimum binarization of technical document images

Optimum binarization of technical document images

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IEEE International conference on image processing (ICIP 2000)

作者： Valverde, JS Grigat, RR Ericsson Madrid Spain

ISBN: (纸本)0780362985

We present a high quality solution to the binarization problem of technical document images. The method is based on locally adaptive methods without the need of manual interaction or tuning. The algorithm includes Niblack's binarization and two validation steps based on morphological image processing and gradient based decisions. Our result has the following advantages. Alphanumeric labels are restored, even if they are hardly readable in the source image. parallel, multiple lines with small distance are reconstructed. Even detail of very low contrast in the vicinity of strong contrast image areas is reconstructed (e.g. faint stamp lines). Variable background intensity is suppressed, but texture and large font bold face letters are restored.

关键词： image analysis

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Intelligent agent support for automated radiology exam

Intelligent agent support for automated radiology exam

引用

4th International conference on parallel and distributed methods for image processing IV

作者： Shang, Y Popescu, M Univ Missouri Dept Comp Sci & Comp Engn Columbia MO 65211 USA

ISBN: (纸本)0819437638

A difficult problem in automatic medical image understanding is that for every image type such as x-ray and every body organ such as heart, there exist specific solutions that do not allow for generalization. Just collecting all the specific solutions will not achieve the vision of a computerized physician. To address this problem, we propose an intelligent agent approach that is based on agent-oriented programming and the concept of active fusion. The advantage of agent-oriented programming is that it combines the benefits of object-oriented programming and expert system. For radiology image understanding, we present a multi-agent system that is composed of two major types of intelligent agents: radiologist agents and patient agents. A patient agent asks for multiple opinions from radiologist agents in interpreting a given set of images and then integrates the opinions. A radiologist agent decomposes the image recognition task into smaller problems that are solved collectively by multiple intelligent sub-agents. Finally, we present a preliminary implementation and running examples of the multi-agent system.

关键词： intelligent agent radiology image interpretation information fusion

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FPGA-based parallel implementation for the lifting discrete wavelet transform

FPGA-based parallel implementation for the lifting discrete ...

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4th International conference on parallel and distributed methods for image processing IV

作者： Aranki, N Jiang, WQ Ortega, A CALTECH Jet Prop Lab Pasadena CA 91101 USA

ISBN: (纸本)0819437638

The rapidly increasing popularity of the discrete wavelet transform (DWT) as an effective tool in many signal processing and data compression applications, and its integration into JPEG 2000 has given rise to various DWT algorithms and their VLSI implementations to reduce complexity and enhance performance, In this paper, we present an efficient hardware implementation of the discrete wavelet transform and its deployment on a reconfigurable FPGA based platform. Our implementation is a novel architecture based on the lifting factorization of the wavelet filter banks. This factorization leads to a block based parallel DWT architecture suitable for hard-ware implementation. To overcome the communication overhead associated with the DWT block transform, we utilize the new Overlap-State(1,2) technique to compute the DWT near block boundaries. A VHDL description of the lifting polyphase factorization architecture was developed and ported to an FPGA hardware platform that was chosen to allow partial and full reconfigurability to accommodate Various applications with different filter banks. Our hardware implementation improves the performance by better than twofold speed up when compared to an efficient pipelined FPGA based implementation.

关键词： discrete wavelet transform field programmable gate array(FPGA) parallel architecture overlap-state split and merge hardware implementation reconfigurable platform

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Virtual video tape: A novel development tool for real-time motion image understanding

Virtual video tape: A novel development tool for real-time m...

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4th International conference on parallel and distributed methods for image processing IV

作者： Mizoguchi, H Hidai, K Hiraoka, K Shigehara, T Mishima, T Saitama Univ DICS Urawa Saitama 3388570 Japan

ISBN: (纸本)0819437638

This paper proposes Virtual Video Tape (WT). It is a randomly accessible motion image recorder in main memory. VVT is realized with only software, not hardware. It is intended as a tool for real-time motion image understanding research. Recent remarkable progress of PC hardware enables to use gigabyte order main memory. By utilizing such large sized memory, there is a possibility to realize motion image recorder with software. Thus we propose VVT as an example of this kind image recorder. Utilizing current components, recording time fan be expected as minutes order. Since the proposed VVT is fully digital, there is no analog medium nor possibility for degradation of image quality. Since there is no deterioration of playback image and no rewinding. VVT must contribute to program development for motion image understanding. Based upon the proposed idea, the authors have implemented a prototype VVT and used the prototype to develop visual tracking, real-time face detection, and so forth. Through the implementation and experience of the usage, we have confirmed feasibility and effectiveness of the proposed idea. In this paper, the authors discuss background, required functions and structure of the recorder. Some implementation issues are also described.

关键词： solid state video recorder deterioration-free rewinding-free randomly accessible

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parallel image processing for line detection in shared-memory and distributed environments

Parallel image processing for line detection in shared-memor...

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conference on Intelligent Robots and Computer Vision XIX: Algorithms, Techniques, and Active Vision

作者： Kyrki, V Ikonen, J Porras, J Kälviäinen, H Lappeenranta Univ Technol Lab Informat Proc FIN-53851 Lappeenranta Finland

ISBN: (纸本)0819438626

parallel systems provide a robust approach for high performance computing. Lately the use of parallel computing has become more available as new;parallel environments have evolved. Low cost and high performance of off-the-shelf PC processors have made PC-based multiprocessor systems popular. These systems typically contain two or four processors. Standardized POSIX-threads have formed an environment for the effective utilization of several processors, Moreover, distributed computing using networks of workstations has increased. The motivation for this work is to apply these techniques in computer vision. The Hough Transform (HT) is a well-known method for detecting global features in digital images. However, in practice, the sequential HT is a slow method with large images. We study the behavior of line detecting HT with both message passing workstation networks and shared-memory, multiprocessor systems. parallel approaches suggested in this paper seem to decrease the computation time of HT significantly. Thus, the methods are useful for real-world applications.

关键词： Hough transform parallel environments multiprocessor systems workstation networks

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