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Editorial: Knowledge engineering, semantics, and signal processing in audio - visual information retrieval

IEEE Transactions on Circuits and Systems for Video Technology 2007年第3期17卷 257-258页

作者： Izquierdo, Ebroul Zhang, Jian Sikora, Thomas Huang, Thomas S. Department of Electrical Engineering Queen Mary University of London London El 4NS United Kingdom Sydney Australia School of Computer Science and Engineering University of New South Wales Australia Communication Systems Group Technical University Berlin Berlin Germany ITG University of Illinois at Urbana-Champaign United States Department of Electrical and Computer Engineering Coordinated Science Laboratory United States Image Formation and Processing Group Beckman Institute for Advanced Science and Technology United States Institute's Major Research Theme Human Computer Intelligent Interaction National Academy of Engineering Chinese Academies of Engineering and Sciences China International Association of Pattern Recognition Optical Society of American United States

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关键词： Special issues and sections Knowledge engineering Information retrieval Audio-visual systems

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CNN-UM based transversely isotropic elastic wave propagation simulation

CNN-UM based transversely isotropic elastic wave propagation...

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European Conference on Circuit Theory and Design, ECCTD

作者： Peter Sonkoly Istvan Noe J. M. Carcione Zoltan Nagy Peter Szolgay Department of Image Processing and Neurocomputong University of Pannonia Veszprem Hungary Geophysics of the Lithosphere National Institute of Oceanography and Experimental Geophysics Trieste Italy Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary

Several previous studies have proved the effectiveness of the CNN-UM solution of isotropic elastic wave equations. Most crustal rocks of interest to exploration geophysics are either inherently anisotropic or behave as anisotropic materials when probed by seismic waves. This paper describes modeling of wave propagation in transversely isotropic media. Numerical methods which are based on finite-difference (FD) techniques (in time and space) were not efficient when applied to realistic 3D models, because they require enormous computer memory and power. This work investigates the simulation speedup of FD techniques by CNN-UM architecture. Unfortunately the huge number of space- dependent equations and the low computational precision do not make it possible to utilize the huge computing power of the analogue VLSI CNN-UM chips so the FPGA based Falcon emulated digital CNN-UM architecture is used to implement our solution.

关键词： Anisotropic magnetoresistance computer architecture Analog computers Partial differential equations Geophysics Seismic waves Finite difference methods Computational modeling Very large scale integration Field programmable gate arrays

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On the Diversity-Multiplexing Tradeoff for Multi-Antenna Multi-Relay Channels

On the Diversity-Multiplexing Tradeoff for Multi-Antenna Mul...

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IEEE International Conference on Communications (ICC)

作者： Y. Fan J. S. Thompson A. Adinoyi H. Yanikomeroglu Institute for Digital Communications Joint Research Institute for Signal and Image Processing School of Engineering and Electronics University of Edinburgh Edinburgh UK Broadband Communications and Wireless Systems centre Department of Systems and Computer Engineering Carleton University Ottawa Canada

In this paper we analyze the performance of multiple relay channels when multiple antennas are deployed only at relays. Specifically, we investigate the simple repetition-coded decode-and-forward protocol and apply two antenna combining techniques at relays, namely maximum ratio combining (MRC) on receive and transmit beamforming (TB). We assume that the total number of antennas at all relays is fixed to N. With a reasonable power constraint at the relays, we show that the antenna combining techniques can exploit the full spatial diversity of the relay channels and can achieve the same diversity multiplexing tradeoff as achieved by more complex space-time distributed coding techniques, such as those proposed by Laneman and Womell (2003).

关键词： Relays Diversity reception Decoding Transmitting antennas Diversity methods Performance analysis Broadband antennas Power system relaying Receiving antennas Array signal processing

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Autonomous image based localisation for a martian aerobot

Autonomous image based localisation for a martian aerobot

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作者： Barnes, D. Shaw, A. Summers, P. Woods, M. Ward, R. Evans, M. Paar, G. Sims, M. Dept. of Computer Science University of Wales Aberystwyth SY23 3DB United Kingdom Ltd. Bristol BS4 5SS United Kingdom Institute of Digital Image Processing Joanneum Research Graz A-8010 Austria Space Research Centre Dept. of Physics and Astronomy University of Leicester LEl 7RH United Kingdom

Balloon based aerobots have much to offer ESA's future planetary exploration programmes, e.g. high resolution mapping, landing site selection, rover guidance, data relay, sample site selection, payload delivery, and atmospheric measurement and meteorology. Aerobots could be used in a variety of configurations from uncontrolled free-flying to tethered rover operation, and are able to perform a range of important tasks which other exploration vehicles cannot. In many ways they provide a missing 'piece' of the exploration 'jigsaw', acting as a bridge between the capabilities of in-situ landers and rovers and non-contact orbiters. Technically, a Lighter than Air (LTA) aerobot concept is attractive because it is low risk, low-cost, efficient, and much less complex than Heavier than Air (HTA) vehicles such as fixed wing gliders, and crucially, much of the required technology 'building blocks' currently exist. Smart imaging and localisation is a key enabling technology for remote aerobots. Given the current lack of comprehensive localisation and communications systems, it is important that aerobots are equipped with the ability to determine their location, with respect to a planet's surface. The availability of a variety of terrain feature extraction, point tracking, and image compression algorithms, means that a self-reliant system is now achievable. We have developed a demonstrator imaging and localisation package (ILP) for a Martian balloon. This ILP system incorporates a unique combination of image based relative and absolute localisation techniques. We have demonstrated our ILP using both simulation and a real laboratory based model aerobot. The availability of both simulated and real aerobot data thus providing a comprehensive test and evaluation framework for the ILP functionality. The results from our work are presented in this paper.

关键词： Intelligent robots

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Motion Analysis of Endovascular Stent-Grafts by MDL Based Registration

Motion Analysis of Endovascular Stent-Grafts by MDL Based Re...

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International Conference on computer Vision (ICCV)

作者： Georg Langs Nikos Paragios Rene Donner Pascal Desgranges Alain Rahmouni Hicham Kobeiter GALEN Group Laboratoire de Mathématiques Appliquées aux Systàmes Ecole Centrale de Paris France Institute for Computer Graphics and Vision Graz University of Technology Austria Pattern Recognition and Image Processing Group University of Technology Vienna Austria University of Paris XII Paris France

The endovascular repair of a traumatic rupture of the thoracic aorta - that would otherwise lead to the death of the patient - is performed by delivering a stent-graft into the vessel at the rupture location. The age range of the affected patients is large and the stent-graft will stay in the body for the remaining life. The technique is relatively new, and no experience with regard to long-term effects, and durability exists. To predict long-term complications, such as ruptures or destructive interactions with surrounding tissue during the life of the patient, it is important to understand the - rather intense and constant - movement of the stent- graft during the cardiac cycle. A computed tomography with heart gating (gated CT) acquires sequences that show the region of the stent-graft at different time points. We analyze the motion of stent-grafts with a model based approach. Stent-grafts are represented as sparse sets of axis points extracted from the gated CT, and motion patterns are captured by a minimum description length based group-wise registration of the stent-graft at different time points. No parameterization or a priori definition of the topology is necessary, and highly variable elasticity properties in the data volume can by accounted for by the sparse statistical model, that captures correlations and motion components of the stent-graft. We report results for deformation models and registration accuracy for 5 patients.

关键词： Motion analysis Computed tomography Biomedical imaging Heart Buildings computer graphics Pattern recognition image processing Hospitals Data mining

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CNN model on cell multiprocessor array

CNN model on cell multiprocessor array

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European Conference on Circuit Theory and Design, ECCTD

作者： Zoltan Nagy Laszlo Kek Zoltan Kincses Peter Szolgay Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary Department Information Technology Pázmány Péter Catholic University Budapest Hungary Department Image Processing and Neurocomputing University of Pannonia Veszprem Hungary

Array computers can be useful in the solution of numerical spatio-temporal problems such as the state equation of the CNN or partial differential equations (PDE). IBM has recently introduced the cell broadband engine (Cell BE) Architecture which contains 8 identical vector processors in an array structure. In the paper the implementation of CNN simulation kernel on the Cell BE is described. The simulation kernel is optimized, according to the special requirements of the Cell BE and can use linear and also nonlinear (piecewise linear) templates. The area/speed/power tradeoffs of our solution and different hardware implementations are also compared.

关键词： Cellular neural networks computer architecture Concurrent computing Partial differential equations Engines Kernel Hardware Signal processing Distributed computing Blades

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Control mesh representation of a class of minimal surfaces

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第9期7卷 1544-1549页

作者： XU Gang WANG Guo-zhao Institute of Computer Graphics and Image Processing Department of Mathematics Zhejiang University Hangzhou 310027 China

Minimal surface is extensively employed in many areas. In this paper, we propose a control mesh representation of a class of minimal surfaces, called generalized helicoid minimal surfaces, which contain the right helicoid and catenoid as special examples. We firstly construct the Bézier-like basis called AHT Bézier basis in the space spanned by {1, t, sint, cost, sinht, cosht}, t∈[0,α], α∈[0,5π/2]. Then we propose the control mesh representation of the generalized helicoid using the AHT Bézier basis. This kind of representation enables generating the minimal surfaces using the de Casteljau-like algorithm in CAD/CAGD mod- elling systems.

关键词： Minimal surface Helicoid surface Catenoid Control mesh

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Symmetric alteration of four knots of B-spline and NURBS surfaces

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第6期7卷 1084-1087页

作者： LI Ya-juan WANG Guo-zhao Institute of Computer Graphics and Image Processing Department of Mathematics Zhejiang University Hangzhou 310027 China

Modifying the knots of a B-spline curve, the shape of the curve will be changed. In this paper, we present the effect of the symmetric alteration of four knots of the B-spline and the NURBS surfaces, i.e., symmetrical alteration of the knots of surface, the extended paths of points of the surface will converge to a point which should be expressed with several control points. This theory can be used in the constrained shape modification of B-spline and NURBS surfaces.

关键词： B-spline surface NURBS surface Knot modification Path

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Conversion matrix between two bases of the algebraic hyperbolic space

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Journal of Zhejiang University: Science 2006年第SUPPL. 2期7卷 181-186页

作者： Fan, Feng-Tao Wang, Guo-Zhao Institute of Computer Graphics and Image Processing Department of Mathematics Zhejiang University Hangzhou 310027 China

This paper presents the matrix representation for the hyperbolic polynomial B-spline basis and the algebraic hyperbolic Bézier basis in a recursive way, which are both generated over the space Ωn=span{sinht, cosht, tn-3, , t, 1} in which n is an arbitrary integer larger than or equal to 3. The conversion matrix from the hyperbolic polynomial B-spline basis of arbitrary order to the algebraic hyperbolic Bézier basis of the same order is also given by a recursive approach. As examples, the specific expressions of the matrix representation for the hyperbolic polynomial B-spline basis of order 4 and the algebraic hyperbolic Bézier basis of order 4 are given, and we also construct the conversion matrix between the two bases of order 4 by the method proposed in the paper. The results in this paper are useful for the evaluation and conversion of the curves and surfaces constructed by the two bases.

关键词： computer graphics

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Optimal multi-degree reduction of Bézier curves with G1-continuity

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Journal of Zhejiang University: Science 2006年第SUPPL. 2期7卷 174-180页

作者： Lu, Li-Zheng Wang, Guo-Zhao Institute of Computer Graphics and Image Processing Department of Mathematics Zhejiang University Hangzhou 310027 China

This paper presents a novel approach to consider optimal multi-degree reduction of Bézier curve with G1-continuity. By minimizing the distances between corresponding control points of the two curves through degree raising, optimal approximation is achieved. In contrast to traditional methods, which typically consider the components of the curve separately, we use geometric information on the curve to generate the degree reduction. So positions and tangents are preserved at the two endpoints. For satisfying the solvability condition, we propose another improved algorithm based on regularization terms. Finally, numerical examples demonstrate the effectiveness of our algorithms.

关键词： computer graphics

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