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Formation constrained coordinated motion control methods for the crustal movement simulation system

Formation constrained coordinated motion control methods for...

引用

2010 International conference on Intelligent Control and Information processing, ICICIP 2010

作者： Fan, Changchun Yang, Guodong Li, En Liang, Zize Institute of Automation Chinese Academy of Sciences Beijing China

ISBN: (纸本)9781424470488

Crustal movement modeling and analysis is one of the major tasks in the earth system science. In this paper, a distributed system for simulating the crustal movement was developed. The crustal movement simulation system (CMSS) is designed based on multi-agent system (MAS). Such a simulation system is composed by a number of independently controlled parallel robots, and each robot represents a crustal plate. To achieve smooth and accurate motion without slipping and sliding, realtime coordinate control of the multi-agent system is essential. Based on the MAS, a general approach for formation constrained coordinated motion control scheme is proposed. The feasibility and effectiveness of the network-based MAS control method is verified through simulation. © 2010 IEEE.

关键词： Multi agent systems

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Rotation based algorithm for parallelizing OS-SART for CT on homogenous multicore architecture

Rotation based algorithm for parallelizing OS-SART for CT on...

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12th IASTED International conference on Signal and image processing, SIP 2010

作者： Xu, Meilian Thulasiraman, Parimala Department of Computer Science University of Manitoba Winnipeg MB R3T 2N2 Canada

ISBN: (纸本)9780889868687

Iterative reconstruction techniques are safe approaches for computed tomography (CT). However, the long processing time of them prevent their adoption in clinical CT machines. Recently, with the growing increase in computational power due to multiple cores on a chip, iterative techniques are no longer deemed unsolvable. In this paper, we investigate one category of iterative techniques which stem from algebraic reconstruction technique, including ART (algebraic reconstruction technique), SIRT (simultaneous iterative reconstruction technique), SART (simultaneous algebraic reconstruction technique), and ordered subset version of SART (OS-SART). We exploit the parallelism in OS-SART and its feasibility to parallelization on homogenous shared memory multicore architectures. OSSART is memory bound due to the frequent access to a large weighting factor matrix. Therefore, to reduce memory latency in OS-SART, we parallelize OS-SART algorithm by incorporating rotation-based projector and backprojector which enables the computation of weighting factors at runtime on a need basis. The results show that our parallel algorithm is scalable on homogeneous multicore architecture in terms of both core number and problemsize. For 8 cores, the speedup increases from 6.77 for image size of 128×128 to 7.02 for image size of 512×512. For 16 cores, the speedup increases from 12.29 for image size 128×128 to 13.18 for image size 512×512.

关键词： Iterative methods

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Improving super-resolution image reconstruction by in-plane camera rotation

Improving super-resolution image reconstruction by in-plane ...

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作者： Bonchev, Stefan Alexiev, Kiril Faculty of Mathematics and Informatics Sofia University Sofia Bulgaria Institute of Parallel Information Processing Bulgarian Academy of Sciences Sofia Bulgaria

ISBN: (纸本)9780982443811

In a digital optical imaging system, image resolution is constrained by several factors, including focus plane array pitch and optics. Super-resolution approaches aim at overcoming some of these limits by incorporating additional information of the object and/or combining several pictures of the same object, taken with some displacements between each other. This paper considers the second class of methods. The obtainable resolution improvement in this case has an upper limit, determined by the signal-to-noise ratio of the image taken. Moreover, some fourier spectrum frequencies below this limit are unrestorable. Here an approach is introduced to overcome this by active control of the camera movements. An experiment, verifying the approach is presented.

关键词： image reconstruction

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processing 3D scanner data for virtual reality

Processing 3D scanner data for virtual reality

引用

2010 10th International conference on Intelligent Systems Design and Applications, ISDA'10

作者： Szabó, Csaba Korečko, Štefan Sobota, Branislav Dept. of Computers and Informatics FEEI Technical University of Košice Košice Slovakia

ISBN: (纸本)9781424481354

Digitization of real objects into 3D models is a rapidly expanding field, with ever increasing range of applications. The most interesting area of its application is in the creation of realistic 3D scenes, i.e. virtual reality. It can be used in the entertainment industry, design, architecture and scientific research. This paper provides a brief summary of current 3D scanning technologies, deals with some aspects of data processing required to acquire a usable 3D model and presents various 3D visualization methods with focus on stereoscopy. This processing represents large graphical data processing also in parallel computer systems pertinently. © 2010 IEEE.

关键词： Stereo image processing

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Optimizing adaptive synchronization in parallel simulators for large-scale parallel systems and applications

Optimizing adaptive synchronization in parallel simulators f...

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10th IEEE International conference on Computer and Information Technology, CIT-2010, 7th IEEE International conference on Embedded Software and Systems, ICESS-2010, 10th IEEE Int. Conf. Scalable Computing and Communications, ScalCom-2010

作者： Xu, Chuanfu Che, Yonggang Fang, Jianbin Wang, Zhenghua National Laboratory for Parallel and Distributed Processing School of Computer National University of Defense Technology Changsha China

ISBN: (纸本)9780769541082

This paper addresses the optimization of parallel simulators for large-scale parallel systems and applications. Such simulators are often based on parallel discrete event simulation with conservative or optimistic protocols to synchronize the simulating processes. The paper considers how available future information about events and application behaviors can be efficiently extracted and further exploited to improve the performance of adaptive optimistic protocols. First, we extract information about future events and their dependencies in application traces to guide adaptive adjustments of time window in trace-driven parallel simulation. Second, we use information about application behaviors, specifically the iterative behavior found in many applications, to avoid the unnecessary adjustments of time window. These techniques are implemented in the BigSim simulator and tested by real-world and standard benchmark applications including Jacobi3D and HPL. The results show that our optimization approaches can reduce the execution times of simulation ranging from 11% up to 32%. Moreover, our methods are easy to implement and don't need to augment compilers or even modify the core codes of parallel simulators. © 2010 IEEE.

关键词： Simulators

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ECG Gated Tomographic reconstruction for 3-D Rotational Coronary Angiography

ECG Gated Tomographic reconstruction for 3-D Rotational Coro...

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32nd Annual International conference of the IEEE Engineering-in-Medicine-and-Biology-Society (EMBC 10)

作者： Hu, Yining Xie, Lizhe Nunes, Jean Claude Bellanger, Jean Jacques Bedossa, Marc Toumoulin, Christine South East Univ LIST Nanjing 210096 Peoples R China Univ Rennes 1 Lab Traitment Signal Image F-35000 Rennes France CHU Rennes Dept Cardiol Interventionelle F-35033 Rennes France Ctr Recherche Informat Biomed Sino Francais F-35033 Rennes France Natl Inst Hlth & Med Res INSERM F-35000 Rennes France

ISBN: (纸本)9781424441242

A method is proposed for 3-D reconstruction of coronary from a limited number of projections in rotational angiography. A Bayesian maximum a posteriori (MAP) estimation is applied with a Poisson distributed projection to reconstruct the 3D coronary tree at a given instant of the cardiac cycle. Several regularizers are investigated L0-norm, L1 and L2-norm in order to take into account the sparsity of the data. Evaluations are reported on simulated data obtained from a 3D dynamic sequence acquired on a 64-slice GE LightSpeed CT scan. A performance study is conducted to evaluate the quality of the reconstruction of the structures.

关键词： 3-D rotational coronary angiography 3D coronary tree 3D dynamic sequence Bayes methods Bayesian maximum a posteriori estimation ECG gated tomographic reconstruction GE LightSpeed CT scan L0-norm L1 norm L2-norm Poisson distributed projection Poisson distribution angiocardiography cardiac cycle computerised tomography electrocardiography image reconstruction maximum likelihood estimation medical image processing rotational angiography

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parallel processing for Secret image Sharing

Parallel Processing for Secret Image Sharing

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International Symposium on parallel and distributed processing with Applications, ISPA

作者： Wen-Pinn Fang Department of Computer Science and Information Engineering Yuanpei University Hsinchu Taiwan

Secret image sharing is a method to transmit and store an image safely. The security of secret image sharing is based on the fact that the values are operated in the finite field and the number of pixels is high enough to ensure security. However, the time complexity to encode and decode a secret image is not acceptable in real-time application. There are some papers discussing how to upgrade the efficiency of encoding phase while few papers exploring how to decrease the decoding phase time. This paper proposes a method to achieve to speed up decoding phase by parallel processing.

关键词： Decoding Cryptography Complexity theory parallel processing Pixel Finite element methods conferences

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Registration and analysis of x-ray images received from the system of radiographic control (SRC) "sibscan

Registration and analysis of x-ray images received from the ...

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IASTED International conference on Automation, Control, and Information Technology - Information and Communication Technology, ACIT-ICT 2010

作者： Kulikov, V.A. Popov, S.A. Kirichuk, V.S. Institute of Automation and Electrometry SB RAS Ak. Koptyuga 1 Novosibirsk Russia

ISBN: (纸本)9780889868410

The paper presents the application of different filtering algorithms to simplify the search for suspicious objects on the X-ray image obtained by SRC "Sibscan". The basic idea of x-ray image filtering is an image contrast enhancement with minimal loss of information. We have proposed a new method of obtaining image luminance differences, allowing to identify 12 directions in the 35 * O (N) operations on the image. We had shown that the combination of the logarithm of the image and the image gradients can improve the visual quality of the latter. A study was conducted with existing methods of histogram equalization, in that study the method of adaptive histogram equalization had shown the best results. Combination of the adaptive equalized image and the image gradient corrects deficiencies of the equalization. Filtering algorithms were implemented in a software system, written on programming language C+ +. image processing takes 3 seconds on a standard PC with image size of 1000 by 1024 pixels, and can be accelerated on parallel computation using multiple cores in accordance to the technology OpenMP.

关键词： image enhancement

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Feature preserving consolidation for unorganized point clouds

Feature preserving consolidation for unorganized point cloud...

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IEEE International conference on Progress in Informatics and Computing (PIC)

作者： Li, Bao Jiang, Wei Cheng, Zhiquan Dang, Gang Jin, Shiyao National Laboratory for Parallel and Distributed Processing School of Computer National University of Defense Technology Changsha China

ISBN: (纸本)9781424467860

We introduce a novel method for the consolidation of unorganized point clouds with noise, outliers, non-uniformities as well as sharp features. This method is feature preserving, in the sense that given an initial estimation of normal, it is able to recover the sharp features contained in the original geometric data which are usually contaminated during the acquisition. The key ingredient of our approach is a weighting term from normal space as an effective complement to the recently proposed consolidation techniques. Moreover, a normal mollification step is employed during the consolidation to get normal information respecting sharp features besides the position of each point. Experiments on both synthetic and real-world scanned models validate the ability of our approach in producing denoised, evenly distributed and feature preserving point clouds, which are preferred by most surface reconstruction methods. ©2010 IEEE.

关键词： Consolidation Feature preserving Point clouds Sharp features

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An Analysis of Depth Estimation within Interaction Range

An Analysis of Depth Estimation within Interaction Range

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IEEE/RSJ International conference on Intelligent Robots and Systems

作者： Karaoguz, Cem Dankers, Andrew Rodemann, Tobias Dunn, Mark Univ Bielefeld Res Inst Cognit & Robot CoR Lab D-33594 Bielefeld Germany Honda Res Inst Europe GmbH D-63073 Offenbach Germany

ISBN: (纸本)9781424466757

Interactions between humans or humanoids and their environment through tasks like grasping or manipulation typically require accurate depth information. The human vision system integrates various monocular and binocular depth estimation mechanisms in order to achieve robust and reliable depth perception. Such an integrated approach can be applied to humanoid depth perception. Integration requires a knowledge of the characteristics of the methods being combined. Three different methods incorporating active vision (stereo disparity, vergence and familiar size) were statistically examined and combinations of these methods based on this statistical examination were investigated. We found evidence that active vision provides better depth estimations than the standard static-parallel stereo methods examined within interaction range and therefore is better suited for tasks like reaching, grasping and manipulation. We also demonstrate that a combination of methods have the potential to increase the accuracy of estimations.

关键词： binocular depth estimation mechanism grasping human vision humanoid humanoid robots manipulation monocular depth estimation mechanism robot vision spatial variables measurement statistical analysis stereo disparity method stereo image processing vergence method visual perception

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