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Sketch-based subdivision models 09

Sketch-based subdivision models

引用

Sketch-Based Interfaces and Modeling 2009 - ACM SIGGRAPH/Eurographics Symposium Proceedings

作者： Nasri, A. Karam, W. Bou Samavati, F. Computer Graphics and Animation Lab. Department of Computer Science American University of Beirut Lebanon Computer Sciences Department University of Calgary Canada

ISBN: (纸本)9781605586021

Designing a control mesh (or a polyhedron) for a subdivision model is a tedious task. It involves many difficult decisions such as how to minimize the number of extraordinary vertices, how best to choose their valencies, and where to place them in the control mesh. In this paper, we present an intuitive and interactive approach for using sketch-based interface to design subdivision models. The input to the system is a set of strokes forming the profile curves of the surface. From the constructed control polygons of the sketched curves, a coarse and quad dominant control mesh is generated with few extraordinary vertices or faces. The corresponding limit surface interpolates the profile curves with the capability of local control across these curves and of the model in general. Although our approach is oriented towards quad-based systems such as Catmull-Clark, it could well be adopted in other subdivision schemes. Copyright © 2009 by the Association for Computing Machinery, Inc.

关键词： Mesh generation

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Style learning and transferring for facial animation editing 09

Style learning and transferring for facial animation editing

引用

Symposium on computer Animation 2009 - ACM SIGGRAPH / Eurographics Symposium

作者： Ma, Xiaohan Le, Binh Huy Deng, Zhigang Computer Graphics and Interactive Media Lab Department of Computer Science University of Houston Houston TX United States

ISBN: (纸本)9781605586106

Most of current facial animation editing techniques are frame-based approaches (i.e., manually edit one keyframe every several frames), which is ineffective, time-consuming, and prone to editing inconsistency. In this paper, we present a novel facial editing style learning framework that is able to learn a constraint-based Gaussian Process model from a small number of facial-editing pairs, and then it can be effectively applied to automate the editing of the remaining facial animation frames or transfer editing styles between different animation sequences. Comparing with the state of the art, multiresolution-based mesh sequence editing technique, our approach is more flexible, powerful, and adaptive. Our approach can dramatically reduce the manual efforts required by most of current facial animation editing approaches. © 2009 ACM.

关键词： Animation

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Texture-enhanced direct volume rendering

Texture-enhanced direct volume rendering

引用

4th International Conference on computer graphics Theory and Applications, GRAPP 2009

作者： Manke, Felix Wünsche, Burkhard Graphics Group Department of Computer Science University of Auckland Auckland New Zealand

ISBN: (纸本)9789898111678

Direct volume rendering (DVR) is a flexible technique for visualizing and exploring scientific and biomedical volumetric data *** functions associate field values with colors and opacities,hovvever,forcomplex data are often not sufficient forencoding all relevant *** introduce a novel visualization technique termed texture-enhanced DVR to visualize supplementarv data such as material properties and additional data *** transitions in the underlving data are represented by coherently morphing textures within user defined regions of *** framework seamlessly integrates into the conventional DVR process,can be executed on the GPU,is extremely povverful and flexible,and enables entirely novel visualizations.

关键词： Transfer functions

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Anisotropic huber-L1 optical flow

Anisotropic huber-L1 optical flow

引用

2009 20th British Machine Vision Conference, BMVC 2009

作者： Werlberger, Manuel Trobin, Werner Pock, Thomas Wedel, Andreas Cremers, Daniel Bischof, Horst Institute for Computer Graphics and Vision Graz University of Technology Austria Department of Computer Science University of Bonn Germany

ISBN: (纸本)1901725391

The presented work is motivated by the problem of restoring severely degraded historic video material via an optical flow-based interpolation. In order to increase the robustness as well as the accuracy of discontinuity preserving variational optical flow models, we propose two extensions. First, we will discuss the deficiencies of an isotropic Total Variation regularization and introduce an anisotropic (i.e. image-driven) regularization based on the robust Huber norm. Second, to cope with the gross outliers contained in historic video material, we propose a novel spatio-temporal regularization approach. Instead of assuming gradual flow changes over time, we impose a symmetry constraint with respect to a central frame. The benefit of the suggested enhancements is illustrated qualitatively on historic video material and quantitatively on the Middlebury optical flow benchmark. © 2009. The copyright of this document resides with its authors.

关键词： Optical flows

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Texture synthesis with prioritized pixel Re-synthesis

Texture synthesis with prioritized pixel Re-synthesis

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作者： Yan, Chung-Ren Lee, Tong-Yee Computer Graphics Group Department of Computer Science and Information Engineering National Cheng Kung University Tainan 701 Taiwan

In this paper, we propose a new patch-based texture synthesis method. The core of the proposed method consists of two main components: (1) a feature-weighted similarity measurement to search for the best match and (2) a dynamically prioritized-based pixel re-synthesis to reduce discontinuity at the boundary of adjacent patches. Examples and experimental comparisons with other previous methods are demonstrated to verify the usefulness of our proposed method. In addition, we enhance the proposed method with a view warping technique to better synthesize non-frontal-parallel textures (NFPTs) that can not be synthesized well by traditional texture synthesis methods.

关键词： Pixels

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Raytracing point clouds using geometric algebra

Raytracing point clouds using geometric algebra

引用

1st International Workshop on computer graphics, computer Vision and Mathematics, GraVisMa 2009

作者： Deul, Crispin Burger, Michael Hildenbrand, Dietmar Koch, Andreas Interactive Graphics Systems Group Computer Science Department TU Darmstadt Germany Embedded Systems and Applications Computer Science Department TU Darmstadt Germany

ISBN: (纸本)9788086943909

Geometric Algebra (GA) supports the geometrically intuitive development of an algorithm with its build-in geometric primitives such as points, lines, spheres or planes. But on the negative side GA has a huge computational footprint. In this paper we study how GA can compete with traditional methods from Linear Algebra (LA) in the field of raytracing. We examine the raytracing algorithm for both GA and LA on the basis of primitive operations. Furthermore we introduce a novel framework for rendering point clouds based on spheres and planes as surface elements. We use this model to benchmark implementations of both algebras. Our results show that depending on the microprocessor architecture like CPUs, FPGAs or GPUs Geometric Algebra and Linear Algebra can raytrace with comparable speed.

关键词： Field programmable gate arrays (FPGA)

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Retinal image analysis for automated glaucoma risk evaluation

Retinal image analysis for automated glaucoma risk evaluatio...

引用

MIPPR 2009 - Medical Imaging, Parallel Processing of Images, and Optimization Techniques: 6th International Symposium on Multispectral Image Processing and Pattern Recognition

作者： Nyúl, László G. Department of Image Processing and Computer Graphics University of Szeged Hungary Department of Computer Science Friedrich-Alexander-University Erlangen-Nuremberg Germany

ISBN: (纸本)9780819478085

Images of the eye ground not only provide an insight to important parts of the visual system but also reflect the general state of health of the entire human body. Automatic retina image analysis is becoming an important screening tool for early detection of certain risks and diseases. Glaucoma is one of the most common causes of blindness and is becoming even more important considering the ageing society. Robust mass-screening may help to extend the symptom-free life of affected patients. Our research is focused on a novel automated classification system for glaucoma, based on image features from fundus photographs. Our new data-driven approach requires no manual assistance and does not depend on explicit structure segmentation and measurements. First, disease independent variations, such as nonuniform illumination, size differences, and blood vessels are eliminated from the images. Then, the extracted high-dimensional feature vectors are compressed via PCA and combined before classification with SVMs takes place. The technique achieves an accuracy of detecting glaucomatous retina fundus images comparable to that of human experts. The "vessel-free" images and intermediate output of the methods are novel representations of the data for the physicians that may provide new insight into and help to better understand glaucoma. © 2009 Copyright SPIE - The International Society for Optical Engineering.

关键词： Principal component analysis

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Hierarchical approach for fast and efficient collision detection in urban simulation

Hierarchical approach for fast and efficient collision detec...

引用

1st International Visual Informatics Conference, IVIC 2009

作者： Asyrani Sulaiman, Hamzah Bade, Abdullah Daman, Daut Suaib, Norhaida Mohd. Department of Computer Graphics and Multimedia Faculty of Computer Science and Information System Universiti Teknologi Malaysia 81310 Skudai Johor Malaysia

ISBN: (纸本)3642050352

Urban simulation research has become an important research area in computer graphics due to the need to visualize urban environment as realistic as possible. Urban environment consists of elements such as culling, lighting, shadows, collision detection and others that will determine the realism level of simulation. One of the key components that need further consideration is to equip the synthetic world with fast and efficient collision detection approach so that urban simulation can be done realistically. In general, hierarchical approach provides fast and efficient collision detection method in urban simulation. We present a new traversal algorithm of Bounding-Volume Hierarchies (BVH) for collision detection (CD) between static and moving object that can be used in urban simulation. The result from the experiments had shown that the combination of the AABB BVH and optimized traversal algorithm is superior over the previous BVH approaches where less time taken to detect collision between static and moving objects in urban simulation. © 2009 Springer-Verlag.

关键词： computer graphics

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Judgment of natural perspective projections in head-mounted display environments 09

Judgment of natural perspective projections in head-mounted ...

引用

VRST 2009 - 16th ACM Symposium on Virtual Reality Software and Technology

作者： Steinicke, Frank Bruder, Gerd Hinrichs, Klaus Lappe, Markus Kuhl, Scott Willemsen, Pete Visualization and Computer Graphics Research Group Department of Computer Science University of Münster Germany Psychology Department II University of Münster Germany Department of Computer Science Michigan Technological University United States Department of Computer Science University of Minnesota Duluth United States

ISBN: (纸本)9781605588698

The display units integrated in todays head-mounted displays (HMDs) provide only a limited field of view (FOV) to the virtual world. In order to present an undistorted view to the virtual environment (VE), the perspective projection used to render the VE has to be adjusted to the limitations caused by the HMD characteristics. In particular, the geometric field of view (GFOV), which defines the virtual aperture angle used for rendering of the 3D scene, is set up according to the display's field of view. A discrepancy between these two fields of view distorts the geometry of the VE in a way that either minifies or magnifies the imagery displayed to the user. Discrepancies between the geometric and physical FOV causes the imagery to be minified or magnified. This distortion has the potential to negatively or positively affect a user's perception of the virtual space, sense of presence, and performance on visual search tasks. In this paper we analyze if a user is consciously aware of perspective distortions of the VE displayed in the HMD. We introduce a psychophysical calibration method to determine the HMD's actual field of view, which may vary from the nominal values specified by the manufacturer. Furthermore, we conducted an experiment to identify perspective projections for HMDs which are identified as natural by subjects-even if these perspectives deviate from the perspectives that are inherently defined by the display's field of view. We found that subjects evaluate a field of view as natural when it is larger than the actual field of view of the HMD-in some cases up to 50%. Copyright © 2009 by the Association for Computing Machinery, Inc.

关键词： Virtual reality

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Presence-enhancing real walking user interface for first-person video games

Presence-enhancing real walking user interface for first-per...

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2009 ACM SIGGRAPH Symposium on Video Games, Sandbox '09

作者： Steinicke, Frank Bruder, Gerd Hinrichs, Klaus Steed, Anthony Visualization and Computer Graphics Research Group Department of Computer Science University of Munster Einsteinstraße 62 48149 Munster Germany Virtual Environments and Computer Graphics Group Department of Computer Science University College London Gower Street London WC1E 6BT United Kingdom

ISBN: (纸本)9781605585147

For most first-person video games it is important that players have a high level of feeling presence in the displayed game environment. Virtual reality (VR) technologies have enormous potential to enhance gameplay since players can experience the game immersively from the perspective of the player's virtual character. However, the VR technology itself, such as tracking devices and cabling, has until recently restricted the ability of users to really walk over long distances. In this paper we introduce a VR-based user interface for presence-enhancing gameplay with which players can explore the game environment in the most natural way, i. e., by real walking. While the player walks through the virtual game environment, we guide him/her on a physical path which is different from the virtual path and fits into the VR laboratory space. In order to further increase the VR experience, we introduce the concept of transitional environments. Such a transitional environment is a virtual replica of the laboratory environment, where the VR experience starts and which enables a gradual transition to the game environment. We have quantified how much humans can unknowingly be redirected and whether or not a gradual transition to a first-person game via a transitional environment increases the user's sense of presence. © 2009 ACM.

关键词： Virtual reality

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