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检索条件"任意字段=23rd ACM International Conference on 3D Web Technology"

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3d scanning method for foot medial arch description

3D scanning method for foot medial arch description

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international conference on Radioelektronika

作者： Ondrej Kaller Libor Bolecek Tomas Kratochvil Lucie Vorlickova Department of Radio Electronics Brno University of Technology Brno Czech Republic Department of Kinesiology Masaryk University Brno Czech Republic

This contribution introduces a new system for foot arch 3d scanning. The aim of this scanning is mainly automatic arch deformity detection and treatment efficiency evaluation in comparison among alternative therapeutic methods. Common arch deformities, which should be scaled and measured by the proposed method, are well known pes planus and pes cavus. Contemporary methods of their detection and description are based on plantogram analysis. Platogram is a poorly defined method of arch orthogonal projection to transversal plane, which could be influenced by the technical equipment used. Also the accuracy of its analysis could be affected by the method used and experience of the evaluator. Our method is based on 3d medial arch scanning by phase shift profilometry method utilization. Sets of periodical patterns are projected to the foot and captured by camera. Images are then segmented and continuous surface of the skin is mapped in space. On the basis of this depth map and colour image, a 3d model of the scanned arch could be created. The paper contains a deep theoretical analysis of applying the proposed method and recommendations how to set optimal parameters of a scanning system for this application.

关键词： Foot Three-dimensional displays Cameras Chemicals Indexes Image edge detection Filtering algorithms

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Hierarchical discriminative framework for detecting tubular structures in 3d images

Hierarchical discriminative framework for detecting tubular ...

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23rd international conference on Information Processing in Medical Imaging, IPMI 2013

作者： Breitenreicher, dirk Sofka, Michal Britzen, Stefan Zhou, Shaohua K. Imaging and Computer Vision Siemens Corporation Corporate Technology Princeton NJ United States Imaging and Therapy Systems Siemens Healthcare Forchheim Germany

ISBN: (纸本)9783642388675

detecting tubular structures such as airways or vessels in medical images is important for diagnosis and surgical planning. Many state-of-the-art approaches address this problem by starting from the root and progressing towards thinnest tubular structures usually guided by image filtering techniques. These approaches need to be tailored for each application and can fail in noisy or low-contrast regions. In this work, we address these challenges by a two-layer model which consists of a low-level likelihood measure and a high-level measure verifying tubular branches. The algorithm starts by computing a robust measure of tubular presence using a discriminative classifier at multiple image scales. The measure is then used in an efficient multi-scale shortest path algorithm to generate candidate centerline branches and corresponding radii measurements. Finally, the branches are verified by a learning-based indicator function that discards false candidate branches. The experiments on detecting airways in rotational X-ray volumes show that the technique is robust to noise and correctly finds airways even in the presence of imaging artifacts. © 2013 Springer-Verlag.

关键词： diagnosis

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Formation of copper 3d structures under stationary conditions of quasi-equilibrium condensation

Formation of copper 3D structures under stationary condition...

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international Crimean conference on Microwave & Telecommunication technology

作者： A.S. Kornyushchenko V.M. Latyshev Yu.A Kosminskaya V.I. Perekrestov Sums'kij derzhavnij universitet Sumy UA

The results of experiments involving obtaining of copper micro- and nanosystems by condensation of ion-sputtered material near thermodynamic equilibrium are presented in the work. We established three basic options for structuring condensates by studying of the structural and morphological characteristics at different stages of the build-up of condensates. The first of these columnar structures are formed through field selectivity. The second mechanism involves the formation of mesoporous crystalline systems in the absence of faceting on the growing surface. In the absence of an electric field, you can implement a third mechanism of structure, which is based on the formation of elongated structural fragments consisting of loosely coupled faceted nanocrystals.

关键词： Copper Three-dimensional displays Electronic mail Mesoporous materials Physics Solids Educational institutions

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Specification of camera parameters for virtual keyboard

Specification of camera parameters for virtual keyboard

引用

international conference on Radioelektronika

作者： Miroslav Hagara Jozef Pucik Peter Kulla Institute of Electronics and Photonics Slovak University of Technology Bratislava Slovakia

Virtual keyboards are commonly used as an on-screen input method in devices with no physical keyboard, where there is no room for one, such as a pocket computer, personal digital assistant (PdA), tablet computer or touch screen equipped mobile phone. The touch screen keyboard can be replaced in the near future with the virtual keyboard based on camera. We work on a project of such virtual keyboard, which is planned to be used in tablet. It means that the camera will capture an area under a relatively sharp angle. In our paper we analyze how the 3d space of a virtual keyboard is projected to the 2d view plane of camera, and we determine the limits of the camera parameters: camera elevation, angle of camera rotation, horizontal viewing angle.

关键词： Cameras Keyboards Three-dimensional displays Fingers Image edge detection Abstracts Personal digital assistants

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3d numerical wave tank using the level set method for the calculation of wave propagation and runup

3d numerical wave tank using the level set method for the ca...

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23rd international Offshore and Polar Engineering conference, ISOPE 2013

作者： Bihs, Hans Kamath, Arun Arntsen, Øivind A. Department of Civil and Transport Engineering Norwegian University of Science and Technology Trondheim Norway

ISBN: (纸本)9781880653999

In the current paper, a novel three dimensional numerical wave tank is presented. The numerical model uses the level set method for the prediction of the interface between the two phases water and air. The free surface is modeled as the zero level set of a scalar signed distance function. In order to maintain this property and to ensure mass conservation, the level set function is reinitialized after each time step. The conservative fifth-order finite difference WENO scheme is used for the discretization of the convective terms. For large gradients and even shocks the scheme ensures a smooth and oscillation free solution, while at the same time maintaining a high order of accuracy. With this scheme the wave damping due to numerical diffusion is kept at a minimum. The pressure is treated with the projection method on a staggered grid, which prevents velocity-pressure decoupling. A preconditioned BiCGStab algorithm is employed for the iterative solution of the Poisson equation. For discretization in time a third-order TVd Runge-Kutta scheme is used. Parallelization of the numerical model is achieved by using the domain decomposition framework together with the MPI library. Since the numerical model employs a Cartesian grid, the present study requires special attention to complex geometries. Here an immersed boundary method based on ghost cell extrapolation is used. As the numerical model is used as a numerical wave tank, wave generation is required for the inlet boundary. Wave generation is modeled through a transient velocity and water elevation profile obtained from wave theory and is implemented through a relaxationzone. Wave reflections of the downstream boundary are prevented by the implementation of a numerical beach. The numerical wave tank is validated through comparison between numerical and theoretical wave profiles in a twodimensional wave flume setup. Here the advantage of the level set solver with its high order of accuracy is highlighted, exhibiting negl

关键词： Wave propagation

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Formation of copper 3d structures under stationary conditions of quasi-equilibrium condensation

Formation of copper 3D structures under stationary condition...

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2013 23rd international Crimean conference Microwave and Telecommunication technology, CriMiCo 2013

作者： Kornyushchenko, A.S. Latyshev, V.M. Kosminskaya, Yu.A. Perekrestov, V.I. Sumy State University 2 Rymsky Korsakov Str. Sumy 40007 Ukraine

ISBN: (纸本)9789663354019

关键词： Copper

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Experimental study of relativistic millimeterwave magnetron

Experimental study of relativistic millimeterwave magnetron

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2013 23rd international Crimean conference Microwave and Telecommunication technology, CriMiCo 2013

作者： Berdin, S.A. Chizhov, K.V. Gadetsky, N.P. Korenev, V.G. Lebedenko, A.N. Magda, I.I. Marchenko, M.I. Melezik, O.G. Soshenko, V.A. Terekhin, S.N. Tishchenko, A.S. National Science Centre Kharkov Institute of Physics and Technology of NASU 1 Academicheskaya Str. National 61108 Ukraine Usikov Institute for Radiophysics and Electronics of NASU 24 Proskura Ave. Kharkov 61024 Ukraine

ISBN: (纸本)9789663354019

Tests of 48-cavity mm-waveband relativistic magnetron (RM) confirm the results of theoretic calculation and 3d simulation. Radiation appears in the frequency range of 36-39 GHz corresponding the induction of p-mode oscillations of the fundamental spatial harmonic. At the same time, there is evidence that in the modes of developed generation the electrons in the interaction area are affected by radio frequency. fields with the amplitude compared to static ones. They sufficiently vary the interaction condition between particles and resonators and shorten the radiation impulse. © 2013 CriMiCo'2013 Organising Committee, CrSTC.

关键词： Magnetrons

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Complex dielectric parameter measurement by coaxial resonator and ISM band radio module

Complex dielectric parameter measurement by coaxial resonato...

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international conference on Radioelektronika

作者： Zoltán Szalay István Ther Lajos Nagy Department of Broadband Infocommunications and Electromagnetic Theory Budapest University of Technology and Economics Budapest Hungary

In many industrial processes, there is required measuring system to determine the moisture content or homogeneity of materials. Such areas are the paper, foil, textile processing and also the building industry. The manufacturers of such systems demand cheap and possibly high precision sensors, which can measure the moisture content in a nondestructive way. The acquired measurement data can be used not only for process control but also quality assurance. To meet these requirements, an open ended coaxial resonator and radio module based measuring system is introduced. As opposed to VNA based sensors, our system measures the scalar scattering parameter. The resonance frequency and the quality factor of the resonator cavity are considered to evaluate the complex permittivity of the measured material which depends on the moisture content of the sample. The coaxial resonator has been analyzed, and designed using HFSS 13. To determine the complex permittivity values, the 3d finite element model was adjusted by using known parameter materials (such as Teflon, FR4), and a database was created by sweeping with the real and the imaginary part of dielectric constant. To decrease the measuring time, adaptive frequency sampling was applied. After measuring different materials the results show that the equipment is able to measure the complex permittivity with high resolution. The simple and cheap measuring system makes this sensor system particularly interesting for moisture monitoring applications.

关键词： Frequency measurement Resonant frequency Permittivity measurement Materials Interpolation Permittivity

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Video game: Tlaxcala, the origin

Video game: Tlaxcala, the origin

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international conference on Electronics, Communications and Computing

作者： Marva-Angelica Mora-Lumbreras Hector Sanchez-Guzman Carlos Santacruz Olmos Josue Hernandez-Flores Christian-Eduardo Sanchez-Chimal Juventino Montiel-Hernandez Facultad de Ciencias Básicas Ingeniería y Tecnología Universidad Autónoma de Tlaxcala UAT Tlaxcala México Facultad de Ciencias Básicas Ingeniería y Tecnologia Universidad Autónoma de Tlaxcala UAT Tlaxcala México

ISBN: (纸本)9781467361569

The technological evolution has resulted in a series of benefits to the education. In recent years there has a groundswell of interest in how video games can improve the education at all levels and both formal and informal education settings. Specifically, this paper present a video game focused on the history of Tlaxcala, called: "Tlaxcala, the origin", this video game is type role-playing game (RPG) and includes different 3d scenes. Tlaxcala, the origin" is divided into different battles, the first is a battle between Tlaxcalans versus Mexicas;the second mission is an alliance between Tlaxcalans and Spaniards;finally, a battle between Spaniards versus Aztecs.

关键词： Video game History Education technology

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A PARALLEL PROCESSING SYSTEM FOR MEASURING 3d SURFACE PROFILE USING RF SPECTROGRAM

A PARALLEL PROCESSING SYSTEM FOR MEASURING 3D SURFACE PROFIL...

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international Crimean conference on Microwave & Telecommunication technology

作者： HyungTae Kim SeungTaek Kim KyungChan Jin Smart System Research Group KITECH 35-3 HongCheon IpJang CheonAn ChungNam South Korea 331-825

ISBN: (纸本)9781479912636

A scanning system was constructed for detecting 3d profile of a whole body using an RF antenna array and a parallel processing unit. The antenna array generated signals whose information indicated reflection from a target object. The signals in the array were produced during rotation and sampled with triggers by a high speed AdC. The sampled data was transferred to a parallel processing unit. Large number of the triggers and the amount of mathematical computation of frequency analysis forms gigabytes of data size. We showed that the parallel processing unit is useful and time-efficient to detect the 3d profile of whole body by millimeter wave imaging.

关键词： PARALLEL PROCESSING SYSTEM SPECTROGRAM

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