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International Conference on Systems, Signals and Image Processing, IWSSIP

作者： Gayane Shalunts Yll Haxhimusa Robert Sablatnig Institute of Computer Aided Automation Computer Vision Laboratory University of Technology Vienna Austria Institute of Computer Graphics and Algorithms Pattern Recognition and Image Processing Lab University of Technology Vienna Austria

Architectural elements are the components and details of buildings. Their unique set, combination, design, construction technique form the architectural style of buildings. Building facade classification by architectural styles is viewed as a task of classifying separate architectural structural elements. In the scope of building facade architectural style classification the current paper targets the problem of classification of Gothic and Baroque architectural elements called tracery, pediment and balustrade. Since certain gradient directions dominate on the shape of each architectural element, discrimination between dominating gradients means classification of architectural elements and thus architectural styles. We use local features to describe gradient directions. Our approach is based on clustering and learning of local features and yields a high classification rate.

关键词： Shape Three dimensional displays Visualization computer vision Histograms Windows

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On-Board Powerplant Numerical Optimization of Internal Combustion Engines in Series Hybrid-Powertrains

On-Board Powerplant Numerical Optimization of Internal Combu...

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FISITA 2012 World Automotive Congress--Volume 3:Future Automotive Powertrains

作者： Thorsten Krenek Thomas Lauer Bernhard Geringer Bacher Christopher Institute for Powertrains and Automotive Technology Vienna University of TechnologyViennaAustria Institute of Computer Graphics and Algorithms Vienna University of TechnologyViennaAustria

Serial-hybrid-powertrains in extended-range electric vehicles(E-REV)pose different requirements to internal combustion engines(ICE) than conventional *** E-REVs ICEs are not used for propulsion but for battery charging and cabin *** work deals with the design of ICEs in *** considers different operating strategies as well as the dimensioning of the electric components of the powertrain and the thermal ***,a longitudinal dynamic model was developed using GTSUITE including the ICE and the thermal *** engine was operated on a test bench in parallel to create the necessary maps for the numerical *** to the high amount of parameters that can be optimized when determining the operating strategies and dimensioning the components,by a numerical optimization method that was developed and customized for this *** numerical investigations showed that for higher vehicle speeds the direct propulsion of the ICE is more efficient while for lower speeds the operation of the ICE as a generator is the more efficient ***,the influence of the ambient temperature on the efficiency was taken into *** low ambient temperatures it is necessary to heat up the driver's cabin *** a thennal numerical model it was possible to show the dependency on the energy consumption,the component dimensioning and the configuration of the operation *** most favourable powertrain setup and the most efficient operating strategies were achieved by using the described numerical optimization *** new and comprehensive approach was to consider the entire vehicle including mechanical components,thermal components and operating strategies in the numerical model setup and the holistic optimization of them using selfdeveloped numerical optimization software.

关键词： Power-split hybrid-powertrain Numerical optimization Rangeextended electric vehicle Thermal management Internal combustion engine

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Image multilevel thresholding using EM and de based on generalized Gaussian mixture model

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ICIC Express Letters, Part B: Applications 2012年第2期3卷 305-312页

作者： Nie, Fangyan Zhang, Pingfeng Pan, Meisen Rong, Qiusheng Institute of Graphics and Image Processing Technology College of Computer Science and Technology Hunan University of Arts and Science No. 170 Dongting Road Changde 415000 China

A novel optimal multilevel thresholding for histogram-based image segmentation is presented in this paper. It is based on the estimation of the statistical parameters of different classes under the assumption that these classes follow generalized Gaussian distribution mixture model. To fit the generalized Gaussian mixture to the histogram of image, the expectation maximization (EM) and a modified differential evolution (DE) hybrid algorithm is developed to estimate the number of generalized Gaussian mixture of such histogram and their corresponding parameterization. The performance of the proposed algorithm is evaluated vis-à-vis Otsu method and EM based on Gaussian distribution method. The experimental results show the effectiveness of the proposed method. © 2012 ICIC International.

关键词： Image segmentation

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ViRAT: An advanced multi-robots platform

ViRAT: An advanced multi-robots platform

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Khelifa Baizid Ryad Chellali Traveler Hauptman Department of Computer Graphics and Multimedia Faculty of Information Technology Brno University of Technology Brno Czech Republic PAVIS Italian Institute of Technology Genoa Italy

In this paper we present the architecture of ViRAT (Virtual Reality for Advanced Tele-operation), the hardware-software platform we developed to support researches and studies dealing with multi-robotics. The achieved architecture is multi-purposes and as such, allows a wide spectrum of operation modes ranging from full tele-operated controls to full autonomous exploitation. From the hardware point of view, the platform offers the possibility to integrate heterogeneous robots having different mobility (wheeled, Humanoids, etc) as well as embedded sensing capabilities (video, laser-scanner, IMU, etc.). From the software side, the developed architecture is modular for more flexibility and adaptability: it includes human-robots interfaces (HRI) bricks, together with supervision and low/high level controls. After presenting the architecture of the ViRAT platform, we give some examples and some use cases to illustrate the performances of ViRAT and the easiness of developing around it.

关键词： Robot kinematics Robot sensing systems Software computer architecture Hardware Humans

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Semantics by analogy for illustrative volume visualization

Semantics by analogy for illustrative volume visualization

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作者： Gerl, Moritz Rautek, Peter Isenberg, Tobias Gröller, Eduard Institute of Mathematics and Computing Science University of Groningen SVCG P.O. Box 407 9700 AK Groningen Netherlands DIGITEO LIMSI-CNRS AVIZ-INRIA Orsay France Institute of Computer Graphics and Algorithms Vienna University of Technology Austria

We present an interactive graphical approach for the explicit specification of semantics for volume visualization. This explicit and graphical specification of semantics for volumetric features allows us to visually assign meaning to both input and output parameters of the visualization mapping. This is in contrast to the implicit way of specifying semantics using transfer functions. In particular, we demonstrate how to realize a dynamic specification of semantics which allows to flexibly explore a wide range of mappings. Our approach is based on three concepts. First, we use semantic shader augmentation to automatically add rule-based rendering functionality to static visualization mappings in a shader program, while preserving the visual abstraction that the initial shader encodes. With this technique we extend recent developments that define a mapping between data attributes and visual attributes with rules, which are evaluated using fuzzy logic. Second, we let users define the semantics by analogy through brushing on renderings of the data attributes of interest. Third, the rules are specified graphically in an interface that provides visual clues for potential modifications. Together, the presented methods offer a high degree of freedom in the specification and exploration of rule-based mappings and avoid the limitations of a linguistic rule formulation. © 2011 Elsevier Ltd.

关键词： Semantics

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Bridging gaps between three-generation families' Needs and Attitudes towards e-health technologies

Bridging gaps between three-generation families' Needs and A...

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International Conference on e-health Networking, Applications and Services (HealthCom)

作者： Odelia Tan Jamie Ng Alvin Wong Wei Kiat Koh Computer Graphics & Interface Institute for Infocomm Research (1R) Agency for Science Technology and Research (A*STAR) Singapore

Adopting e-health technologies may be one of the ways to ease the burden of hospitals, where nurses and doctors may be deployed more efficiently to ensure better patient-centered care. The adoption of e-health not only depends on the government, industry players and the current state of technology. Part of the successful adoption also relies on the users' need for it and their attitude towards using e-health in their daily routine. In this paper, we will share the qualitative research findings of 30 participants (10 families). The findings are based on in-depth interviews in users' homes. With these, the Human Factors team hopes to bridge the gaps between three-generation families' (youth, adult, elderly) needs and attitudes towards e-health technologies. This is in view of having designers, researchers and engineers to develop e-health technologies that would be used and adopted by users (three-generation families) in their daily routine.

关键词： Senior citizens Interviews Monitoring Biomedical monitoring Mobile handsets Internet

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On the hop constrained steiner tree problem with multiple root nodes

On the hop constrained steiner tree problem with multiple ro...

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2nd International Symposium on Combinatorial Optimization, ISCO 2012

作者： Gouveia, Luis Leitner, Markus Ljubić, Ivana Departamento de Estatística e Investigação Operacional Centro de Investigação Operacional Universidade de Lisboa Portugal Institute of Computer Graphics and Algorithms Vienna University of Technology Austria Department of Statistics and Operations Research University of Vienna Austria

ISBN: (纸本)9783642321467

We consider a new network design problem that generalizes the Hop and Diameter Constrained Minimum Spanning and Steiner Tree Problem as follows: given an edge-weighted undirected graph whose nodes are partitioned into a set of root nodes, a set of terminals and a set of potential Steiner nodes, find a minimum-weight subtree that spans all the roots and terminals so that the number of hops between each relevant node and an arbitrary root does not exceed a given hop limit H. The set of relevant nodes may be equal to the set of terminals, or to the union of terminals and root nodes. This paper presents theoretical and computational comparisons of flow-based vs. path-based mixed integer programming models for this problem. Disaggregation by roots is used to improve the quality of lower bounds of both models. To solve the problem to optimality, we implement branch-and-price algorithms for all proposed formulations. Our computational results show that the branch-and-price approaches based on path formulations outperform the flow formulations if the hop limit is not too loose. © 2012 Springer-Verlag.

关键词： Integer programming

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Key frame selection based on Jensen-Rényi divergence

Key frame selection based on Jensen-Rényi divergence

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International Conference on Pattern Recognition

作者： Qing Xu Xiu Li Zhen Yang Jie Wang Mateu Sbert Jianfu Li School of Computer Science and Technology Tianjin University Tianjin China Graphics and Imaging Laboratory Universitat de Girona Girona Spain College of Computer Science and Technology CAUC Tianjin China

ISBN: (纸本)9781467322164

The key frame extraction is designed for obtaining a (very) compressed set of video frames that summarizes the essential content of a video sequence. In this paper, a well-known information theoretic measure, the Jensen-Rényi divergence (JRD), is studied to estimate the frame-by-frame distance between consecutive video images, for segmenting shots/subshots and for choosing key frames. Our new key frame extraction method, which is effective and computationally fast, contributes to a good and quick understanding of a large amount of video data.

关键词： Entropy Video sequences Information theory Educational institutions Measurement Cameras Pattern recognition

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Evaluating net-zero energy houses from the U.S. Department of Energy Solar Decathlon 2011

Evaluating net-zero energy houses from the U.S. Department o...

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Construction Research Congress 2012: Construction Challenges in a Flat World

作者： Wallpe, Jordan Hutzel, William Lasker, Gregory Cory, Clark Department of Mechanical Engineering Technology Purdue University Knoy Hall West Lafayette IN 47906 United States Department of Building Construction Management Purdue University Knoy Hall West Lafayette IN 47906 United States Department of Computer Graphics Technology Purdue University Knoy Hall West Lafayette IN 47906 United States

ISBN: (纸本)9780784412329

The Solar Decathlon is a two year, international project where university students compete to design, build, and test energy-efficient, net-zero homes. By definition, net-zero energy houses annually produce as much electricity as they consume. The 2011 Solar Decathlon, held in Washington D.C., had 19 university teams from around the world. Unfortunately, many past Solar Decathlon houses have traditionally been very costly. However, the 2011 Solar Decathlon was the first competition to have an affordability contest. The affordability contest required each home to be valued under an estimated builder's cost of $250,000, forcing the teams to select economically feasible solutions for creating net zero energy houses. Finding super-efficient, solarpowered, and affordable houses can be done by evaluating the contests associated with the Solar Decathlon 2011. The main cost-effective and energy saving components were discovered by researching final competition scoring of each specific contest. Heat pump water heaters, properly sized photovoltaic arrays, and HVAC systems with proper dehumidification were the main findings of this research. Fortunately, all of these findings can immediately be implemented into the design of net-zero energy housing with off-the-shelf products. © 2012 ASCE.

关键词： Product design

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High-accuracy implementation of fast DCT algorithms based on algebraic integer encoding

High-accuracy implementation of fast DCT algorithms based on...

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International Conference on Signals and Electronic Systems, ICSES

作者： Maxim Vashkevich Marek Parfieniuk Alexander Petrovsky Computer Engineering Department Belarusian State University of Informatics and Radioelectronics Minsk Belarus Department of Digital Media and Computer Graphics Bialystok University of Technology Bialystok Poland

The paper presents a systematic approach to synthesizing and implementing fast algorithms for computing the DCT of a power-of-two size. The main features of the obtainable algorithms are regularity of their signal flow graphs and low arithmetic complexity. Multiplierless implementation of the algorithms is based on the algebraic integer (AI) technique. A general AI encoding scheme for fast DCT algorithms is presented. The approach is demonstrated by using it to derive an AI-based low-error fast implementation of the 16-point DCT.

关键词： Polynomials Discrete cosine transforms Artificial intelligence Algebra Encoding Signal processing algorithms

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