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共 137 条记录，以下是61-70 订阅

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Backward-Forward Least Angle Shrinkage for Sparse Quadratic Optimization

Backward-Forward Least Angle Shrinkage for Sparse Quadratic ...

引用

17th international conference on Neural Information Processing

作者： Zhou, Tianyi Tao, Dacheng Univ Technol Sydney Fac Engn & Informat Technol Ctr Quantum Computat & Intelligent Syst Sydney NSW 2007 Australia

ISBN: (纸本)9783642175367

In compressed sensing and statistical society, dozens of algorithms have been developed to solve l(1) penalized least square regression, but constrained sparse quadratic optimization (SQO) is still an open problem. In this paper, we propose backward-forward least angle shrinkage (BF-LAS), which provides a scheme to solve general SQO including sparse eigenvalue minimization. BF-LAS starts from the dense solution, iteratively shrinks unimportant variables' magnitudes to zeros in the backward step for minimizing the l(1) norm, decreases important variables' gradients in the forward step for optimizing the objective, and projects the solution on the feasible set defined by the constraints. the importance of a variable is measured by its correlation w.r.t the objective and is updated via least angle shrinkage (LAS). We show promising performance of BF-LAS on sparse dimension reduction.

关键词： Shrinkage

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GPU-based responsive grass

GPU-based responsive grass

引用

17th international conference in Central Europe on computer graphics, Visualization and computer vision, WSCG'2009

作者： Jens, Orthmann Salama, Christof Rezk Kolb, Andreas Computer Graphics Group University of Siegen 56076 Siegen Germany

ISBN: (纸本)9788086943930

Large natural environments are often essential for todays computer games. Interaction with the environment is widely implemented in order to satisfy the player's expectations of a living scenery and to help increasing the immersion of the player. Within this context our work describes an efficient way to simulate a responsive grass layer with todays graphics cards in real-time. Clumps of grass are approximated by two billboard representations. GPU-based distance maps of scene objects are employed to test for penetrations and for resolving them. Adaptive refinement is necessary to preserve the shape of deformed billboards. A recovering process is applied after the deformation which restores the original that is to say the undeformed and efficient shape. the primitives of each billboard are assembled during the rendering process. their vertices are dynamically lit within an ambient occlusion based irradiance volume. Alpha-to-Coverage completes the illusion as it is used to simulate the semitransparent nature of grass.

关键词： graphics processing unit

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A novel system for automatic hand gesture spotting and recognition in stereo color image sequences

A novel system for automatic hand gesture spotting and recog...

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17th international conference in Central Europe on computer graphics, Visualization and computer vision, WSCG'2009

作者： Elmezain, Mahmoud Al-Hamadi, Ayoub Michaelis, Bernd Otto-von-Guericke-University Magdeburg Germany

ISBN: (纸本)9788086943930

Automatic gesture spotting and recognition is a challenging task for locating the start and end points that correspond to a gesture of interest in Human-computer Interaction. this paper proposes a novel gesture spotting system that is suitable for real-time implementation. the system executes gesture segmentation and recognition simultaneously without any time delay based on Hidden Markov Models. In the segmentation module, the hand of the user is tracked using mean-shift algorithm, which is a non-parametric density estimator that optimizes the smooth similarity function to find the direction of hand gesture path. In order to spot key gesture accurately, a sophisticated method for designing a non-gesture model is proposed, which is constructed by collecting the states of all gesture models in the system. the non-gesture model is a weak model compared to all trained gesture models. therefore, it provides a good confirmation for rejecting the non-gesture pattern. To reduce the states of the non-gesture model, similar probability distributions states are merged based on relative entropy measure. Experimental results show that the proposed system can automatically recognize isolated gestures with 97.78% and key gestures with 93.31% reliability for Arabic numbers from 0 to 9.

关键词： computer vision

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Fiberbundle-based visualization of a stirred-tank flow

Fiberbundle-based visualization of a stirred-tank flow

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17th international conference in Central Europe on computer graphics, Visualization and computer vision, WSCG'2009

作者： Benger, Werner Feng, Jijao Ritter, Marcel Acharya, Sumanta Roy, Somnath Center for Computation and Technology Louisiana State University 239 Johnston Hall LA 70803 Baton Rouge United States Center for Computation and Technology at LSU Department of Computer Science University of Innsbruck Technikerstrasse 21a A-6020 Innsbruck Austria Louisiana State University Department of Mechanical Engineering LA 70803 Baton Rouge United States

ISBN: (纸本)9788086943930

We describe a novel approach to treat data from a complex numerical simulation in a unified environment using a generic data model for scientific visualization. the model is constructed out of building blocks in a hierarchical scheme of seven levels, out of which only three are exposed to the end-user. this generic scheme allows for a wide variety of input formats, and results in powerful capabilities to connect data. We review the theory of this data model, implementation aspects in our visualization environment, and its application to computational fluid dynamic simulation of flow in an impeller-stirred tank. the computational data are given as a velocity vector field and a scalar pressure field on a mesh consisting of 2088 blocks in curvilinear coordinates.

关键词： Data visualization

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Video-based bicycle detection in underground scenarios

Video-based bicycle detection in underground scenarios

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17th international conference in Central Europe on computer graphics, Visualization and computer vision, WSCG'2009

作者： Beran, Vítězslav Herout, Adam Řezníček, Ivo Brno University of Technology Faculty of Information Technology Department of Computer Graphics and Multimedia Božetěchova 2 612 66 Brno Czech Republic

ISBN: (纸本)9788086943930

Automatic surveillance systems are an important emerging application of object detection algorithms in video. the nature of such systems implies several requirements on the used algorithms. Also, searching for less usual objects (in contrast to frontal human faces, car masks, etc.) is required, such as detection of bicycles. It appears that detection of such objects cannot be solved by just applying a standard statistical or other general detector, but by constructing a specialized detector composed of several standard image processing and object-detection techniques combined together ad hoc. A detector of bicycles in video data from standard low-resolution CCTV surveillance system is presented in this contribution. Bicycle detection approach covered by this paper aims to cope with highly-noisy low-resolution data, to use simple image-processing methods and to work in real time. Although the method itself does not constitute a generally usable object detector, it covers several interesting aspects which can be re-used in tasks similar to the given one. Low-level features extracted from the video used for wheel-candidate classification are described in detail. the system is applied and evaluated on real data and the results are discussed.

关键词： Object detection

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POSTER: Information Transformation for Point Cloud

POSTER: Information Transformation for Point Cloud

引用

17th international conference in Central Europe on computer graphics, Visualization and computer vision

作者： Nishio, Koji Takebayashi, Yusuke Teshima, Yuji Kanaya, Takayuki Kobori, Ken-ichi Osaka Inst Technol 1-79-1 Kitayama Osaka 5730196 Japan

ISBN: (纸本)9788086943954

We propose a method of Information transformation for point cloud, which reduces information amount of three dimensional point data. Our method generates clusters and spiral chain lists. these chain lists are consists of three dimensional points. After that, we adopt a predictive encoding to compress these chain lists. In addition, we will show effectiveness of our method with same experimental results. In these experiments, our method reduces the information amount of point cloud coordinate to 31.7% of original model.

关键词： computer graphics CAD data compression information transformation and point cloud

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vision Aware Continuum Crowds

Vision Aware Continuum Crowds

引用

17th international conference in Central Europe on computer graphics, Visualization and computer vision

作者： Lefer, Wilfrid Univ Pau & Pays Adour F-64013 Pau France

ISBN: (纸本)9788086943947

Crowd simulation has received increasing attention for two decades because potential applications of crowd simulators can be found in various societal domains. the continuum crowd model puts all information related to the decision-making process in a single equation, which can then be solved by a Fast Marching Method approach. In this paper we propose several improvements to the Continuum crowd model: a new governing equation, a new collision avoidance method, and, our major contribution, we add vision capabilities to the characters, thus making them able to collect new information about their Surrounding environment and to reconsider path planning according to up-to-date data.

关键词： computer animation crowd simulation continuous models

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Image Deformation using Radial Basis Function Interpolation

Image Deformation using Radial Basis Function Interpolation

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17th international conference in Central Europe on computer graphics, Visualization and computer vision

作者： Kwon, Jung Hye Lee, Byung Gook Yoon, Jungho Lee, JoonJae Dongseo Univ Dept Visual Contents San 69-1Churye 2Dong Pusan 617716 South Korea

ISBN: (纸本)9788086943954

Image deformation technique is widely used in the field of computer animation, image editing, medical imaging, and other applications in 2D and 3D computer graphics. All the algorithms aim to provide simple user interface, most of which need the user to drag the control points, lines or polygon. the deformation process and the final position of the controlling points should be smooth and precise respectively, and it should also run in real-time. this paper provides a simple image deformation method using the radial basis function interpolation in approximation theory. Radial basis function is a very popular and convenient tool for data representation problems. the proposed method using radial basis function is fast and easy to use more than previous deformation methods. Experiments indicate that the algorithm is stable and well performed.

关键词： Image deformation Radial basis functions Interpolation/approximation Image editing computer animation

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Low cost finger tracking for a virtual blackboard

Low cost finger tracking for a virtual blackboard

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17th international conference in Central Europe on computer graphics, Visualization and computer vision

作者： Rustico, Eugenio Univ Catania Image Proc Lab Dipartimento Matemat & Informat I-95125 Catania Italy

ISBN: (纸本)9788086943930

this paper presents a complete and inexpensive system to track the movements of a physical pointer on a flat surface. Any opaque object can be used as a pointer (fingers, pens, etc.) and it is possible to discriminate whether the surface is being touched or just pointed at. the system relies on two entry-level webcams and it uses a fast scanline-based algorithm. Ail automatic wizard helps the user during the initial setup of the two webcams. No markers, gloves or other hand-held devices are required. Since the system is independent from the nature of the pointing Surface, it is possible to use a screen or a projected wall as a virtual touchscreen. the complexity of the algorithms used by the system grows less than linearly with resolution, making the software layer very lightweight and Suitable also for low-powered devices like embedded controllers.

关键词： Finger pointer tracking optical video webcam camera scanline virtual touchscreen Human-computer Interaction

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Geometric modeling and computer graphics of kinematic ruled surfaces on the base of complex moving one axoid along another (one-sheet hyperboloid of revolution as fixed and moving axoids)

Geometric modeling and computer graphics of kinematic ruled ...

引用

17th international conference in Central Europe on computer graphics, Visualization and computer vision

作者： Rachkovskaya, Galina S. Kharabayev, Yuriy N. 107 Pushkinskaya Str 25 Rostov Na Donu 344007 Russia

ISBN: (纸本)9788086943954

In concordance with logical structure "Geometrical Model of Interaction of two contacted surfaces during the movement of one ruled surface along another - Corresponding Mathematical Transformations of Surfaces New Kinematic Ruled Surfaces" [1-3] a new geometrical model of complex moving one axoid along another for the case of one-sheet hyperboloid of revolution as fixed and moving axoids has been proposed. the main condition of constructing kinematic ruled surfaces is that moving axoid contact with fixed axoid along one their common generating line in each of their positions during complex moving one axoid along another. A case when the axes of fixed and moving axoids are crossed (Fig. 1,2,3), has been considered in this research. Analytical development and computer graphics of the new kinematic surfaces are realized for three types of complex moving. (1)the outside surface of the fixed axoid is revolved slipping-free by the outside surface of the corresponding moving axoid (Fig. 1). (2)the interior surface of the fixed axoid is revolved slipping-free by the outside surface of the corresponding moving axoid (Fig. 2). (3)the outside surface of the fixed axoid is revolved slipping-free by the interior surface of the corresponding moving axoid (Fig. 3). computer graphics of the constructed surfaces (Fig. 1a,2a,3a) have been performed by the previously developed software application [4]. [graphics] .

关键词： Geometric Modeling computer graphics Kinematic Surfaces

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