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作者： Lee, Tong-Yee Yen, Shao-Wei Yeh, I.-Cheng IEEE Computer Graphics Group Department of Computer Science and Information Engineering National Cheng-Kung University No.1 Ta-Hsueh Road Tainan 701 Taiwan

Texture mapping with positional constraints is an important and challenging problem in computer graphics. In this paper, we first present a theoretically robust, foldover-free 2D mesh warping algorithm. Then, we apply this warping algorithm to handle mapping texture onto 3D meshes with hard constraints. The proposed algorithm is experimentally evaluated and compared with the state-of-the-art method for examples with more challenging constraints. These challenging constraints may lead to large distortions and foldovers. Experimental results show that the proposed scheme can generate more pleasing results and add fewer Steiner vertices on the 3D mesh embedding. © 2008 IEEE.

关键词： Textures

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Focus+Context visualization with distortion minimization

Focus+Context visualization with distortion minimization

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作者： Wang, Yu-Shuen Lee, Tong-Yee Tai, Chiew-Lan Computer Graphics Goup Department of Computer Science and Information Engineering National Cheng-Kung University No. 1 Ta-Hsueh Road Tainan 701 Taiwan Department of Computer Science and Engineering Hong Kong University of Science and Technology Clear Water Bay Hong Kong Hong Kong

The need to examine and manipulate large surface models is commonly found in many science, engineering, and medical applications. On a desktop monitor, however, seeing the whole model in detail is not possible. In this paper, we present a new, interactive Focus+Context method for visualizing large surface models. Our method, based on an energy optimization model, allows the user to magnify an area of interest to see it in detail while deforming the rest of the area without perceivable distortion. The rest of the surface area is essentially shrunk to use as little of the screen space as possible in order to keep the entire model displayed on screen. We demonstrate the efficacy and robustness of our method with a variety of models. © 2008 IEEE.

关键词： Medical applications

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Stylized rendering using samples of a painted image

Stylized rendering using samples of a painted image

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作者： Yan, Chung-Ren Chi, Ming-Te Lee, Tong-Yee Lin, Wen-Chieh IEEE Department of Computer Science and Information Engineering Computer Graphics Group National Cheng-Kung University No. 1 Ta-Hsueh Road Tainan 701 Taiwan Department of Computer Science National ChiaoTung University 1001 Ta Hsueh Rd. Hsinchu 300 Taiwan

We introduce a novel technique to generate painterly art maps (PAMs) for 3D nonphotorealistic rendering. Our technique can automatically transfer brushstroke textures and color changes to 3D models from samples of a painted image. Therefore, the generation of stylized images or animation in the style of a given artwork can be achieved. This new approach works particularly well for a rich variety of brushstrokes ranging from simple 1D and 2D line-art strokes to very complicated ones with significant variations in stroke characteristics. During the rendering or animation process, the coherence of brushstroke textures and color changes over 3D surfaces can be well maintained. With PAM, we can also easily generate the illusion of flow animation over a 3D surface to convey the shape of a model. © 2008 IEEE.

关键词： Image processing

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GPU-accelerated Adaptively Sampled Distance Fields

GPU-accelerated Adaptively Sampled Distance Fields

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International Conference on Shape Modeling and Applications

作者： Thiago Bastos Waldemar Celes Department of Computer Science Tecgraf Computer Graphics Technology Group Brazil

Adaptively Sampled Distance Fields (ADFs) are volumetric shape representations that support a broad range of applications in the areas of computer graphics, computer vision and physics. ADFs are especially beneficial for representing shapes with features at very diverse scales. In this paper, we propose a strategy to represent and reconstruct ADFs on modern graphics hardware (GPUs). We employ a 3D hashing scheme to store the underlying data structure and try to balance the tradeoff between memory requirements and reconstruction efficiency. To render ADFs on GPU, we use a general-purpose ray-casting technique based on sphere tracing, which guarantees the reconstruction of fine details. We also present a way to overcome the Cl discontinuities inherent to ADFs and efficiently reconstruct smooth surface normals across cell boundaries. The effectiveness of our proposal is demonstrated for isosurface rendering and morphing.

关键词： Shape computer graphics Application software computer vision Physics Hardware Data structures Rendering (computer graphics) Surface reconstruction Proposals

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Visual equivalence: An object-based approach to image quality

Visual equivalence: An object-based approach to image qualit...

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16th Color Imaging Conference: Color science and Engineering Systems, Technologies, and Applications

作者： Ferwerda, James A. Ramanarayanan, Ganesh Walter, Bruce Bala, Kavita Munsell Color Science Laboratory Center for Imaging Science Rochester Institute of Technology Rochester NY United States Department of Computer Science Cornell University Ithaca NY United States Program of Computer Graphics Cornell University Ithaca NY United States

ISBN: (纸本)9780892082810

In this paper we introduce a new approach to characterizing image quality: visual equivalence, Images are visually equivalent if they convey the same information about object appearance even if they are visibly different. In a series of psychophysical experiments we explore how object geometry, material, and illumination interact to produce images that are visually equivalent, and we identify how two kinds of transformations on illumination fields (blurring and warping) influence observers' judgments of equivalence. We use the results of the experiments to derive metrics that can serve as visual equivalence predictors (VEPs) and we generalize these metrics so they can be applied to novel objects and scenes. Finally we validate the predictors in a confirmatory study, and show that they reliably predict observer's judgments of equivalence. Visual equivalence is a significant new approach to measuring image quality that goes beyond existing visible difference metrics by leveraging the fact that some kinds of image differences do not matter to human observers. By taking advantage of higher order aspects of visual object coding, visual equivalence metrics should enable the development of powerful new classes of image capture, compression, rendering, and display algorithms.

关键词： Image quality

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Throw and tilt - Seamless interaction across devices using mobile phone gestures

Throw and tilt - Seamless interaction across devices using m...

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38th Jahrestagung der Gesellschaft fur Informatik e.V. (GI): Beherrschbare Systeme - Dank Informatik, INFORMATIK 2008

作者： Dachselt, Raimund Buchholz, Robert Department of Simulation and Graphics Faculty of Computer Science Otto-von-Guericke-Universität Magdeburg Universitätsplatz 2 D-39106 Magdeburg Germany

ISBN: (纸本)9783885792277

To overcome limitations of small screens and to provide intuitive ways of interacting with personal data, this work addresses the seamless combination of sensor-enabled phones with large displays. An intuitive basic set of tilt gestures is introduced for a stepwise or continuous interaction with both mobile applications and distant user interfaces by utilizing the handheld as a remote control. In addition, we introduce throwing gestures to transfer media documents to a large display. By means of these gestures, we also propose transferring a running interface from a mobile phone to a large screen (to improve usability) and back (to achieve mobility). We demonstrate the feasibility of the interaction methods with several application prototypes facilitating a very natural flow of interaction.

关键词： Cellular telephones

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Enhancing visualization skills-improving options aNd success (EnViSIONS) of engineering and technology students

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Engineering Design graphics Journal 2009年第2期73卷 1-17页

作者： Veurink, N.L. Hamlin, A.J. Kampe, J.C.M. Sorby, S.A. Blasko, D.G. Holliday-Darr, K.A. Trich Kremer, J.D. Abe Harris, L.V. Connolly, P.E. Sadowski, M.A. Harris, K.S. Brus, C.P. Boyle, L.N. Study, N.E. Knott, T.W. Department of Engineering Fundamentals Michigan Technological University Houghton MI 49931 United States Department of Mechanical Engineering Michigan Technological University Houghton MI 49931 United States Department of Psychology Penn. State Erie Behrend College Erie PA 16563 United States Department of Mechanical Engineering Technology Penn. State Erie Behrend College Erie PA 16563 United States Department of Computer Graphics Technology Purdue University West Lafayette IN 47907 United States Technology and Engineering Education Indiana State University Terre Haute IN 47809 United States Women in Science and Engineering University of Iowa Iowa City IA 52242-1320 United States Department of Industrial Engineering University of Iowa Iowa City IA 52242 United States Department of Engineering and Technology Virginia State University Petersburg VA 23806 United States Department of Engineering Education Virginia Tech. Blacksburg VA 24073 United States

Spatial visualization skills are vital to many careers and in particular to STEM fields. Materials have been developed at Michigan Technological University and Penn State Erie, The Behrend College to assess and develop spatial skills. The EnViSIONS (Enhancing Visualization Skills-Improving Options aNd Success) project is combining these materials and testing them with pre-college and college students at seven institutions: Michigan Tech, Penn State Behrend, Purdue University, University of Iowa, Virginia State University, Virginia Tech, and a "Project Lead the Way" course in south-central Arizona. By removing a barrier to success for students with low visualization skills, particularly women, the project leaders hope to improve the retention of these students in STEM disciplines and to enhance their success. This paper will give a brief overview of the implementations at the university level and the fndings.

关键词： Students

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Graph theoretical framework for simultaneously integrating visual and textual features for efficient web image clustering 08

Graph theoretical framework for simultaneously integrating v...

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17th International Conference on World Wide Web 2008, WWW'08

作者： Rege, Manjeet Dong, Ming Hua, Jing Machine Vision Pattern Recognition Lab. Department ot Computer Science Wayne State University Detroit MI 48202 United States Graphics and Imaging Lab. Department ot Computer Science Wayne State University Detroit MI 48202 United States

ISBN: (纸本)9781605580852

With the explosive growth of Web and the recent development in digital media technology, the number of images on the Web has grown tremendously. Consequently, Web image clustering has emerged as an important application. Some of the initial efforts along this direction revolved around clustering Web images based on the visual features of images or textual features by making use of the text surrounding the images. However, not much work has been done in using multimodal information for clustering Web images. In this paper, we propose a graph theoretical framework for simultaneously integrating visual and textual features for efficient Web image clustering. Specifically, we model visual features, images and words from surrounding text using a tripartite graph. Partitioning this graph leads to clustering of the Web images. Although, graph partitioning approach has been adopted before, the main contribution of this work lies in a new algorithm that we propose - Consistent Isoperimetric High-order Co-clustering (CIHC), for partitioning the tripartite graph. Computationally, CIHC is very quick as it requires a simple solution to a sparse system of linear equations. Our theoretical analysis and extensive experiments performed on real Web images demonstrate the performance of CIHC in terms of the quality, efficiency and scalability in partitioning the visual feature-image-word tripartite graph.

关键词： Digital storage

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An effective load balancing scheme for 3D texture-based sort-last parallel volume rendering on GPU clusters

An effective load balancing scheme for 3D texture-based sort...

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作者： Lee, Won-Jong Srini, Vason P. Park, Woo-Chan Muraki, Shigeru Han, Tack-Don Department of Computer Science Yonsei University Seoul Korea Republic of Department of Computer Science and Engineering Information and Communications University Deajeon Korea Republic of Department of Internet Engineering Sejong University Seoul Korea Republic of Collaborative Research Team of Volume Graphics National Institute of Advanced Industrial Science and Technology Tokyo 135-0064 Japan

We present an adaptive dynamic load balancing scheme for 3D texture based sort-last parallel volume rendering on a PC cluster equipped with GPUs. Our scheme exploits not only task parallelism but also data parallelism during rendering by combining the hierarchical data structures (octree and parallel BSP tree) in order to skip empty regions and distribute proper workloads to rendering nodes. Our scheme can also conduct a valid parallel rendering and image compositing in visibility order by employing a 3D clustering algorithm. To alleviate the imbalance when the transfer function is changed, a load rebalancing is inexpensively supported by exchanging only needed data. A detailed performance analysis is provided and scaling characteristics of our scheme are discussed. These show that our scheme can achieve significant performance gains by increasing parallelism and decreasing synchronizing costs compared to the traditional static distribution schemes. Copyright © 2008 The Institute of Electronics, Information and Communication Engineers.

关键词： Volume rendering

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Multilevel metadata exploration using meta-previewer and cascading-view widgets

Multilevel metadata exploration using meta-previewer and cas...

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RIVF 2008 - 2008 IEEE International Conference on Research, Innovation and Vision for the Future in Computing and Communication Technologies

作者： Nguyen, Dinh-Quyen Sonnet, Henry Faculty of Computer Science University of Information Technology Ho Chi Minh City Viet Nam Department of Simulation and Graphics Otto-von-Guericke University of Magdeburg Magdeburg Germany

ISBN: (纸本)9781424423798

This paper introduces techniques for the exploration of images augmented with additional information. We present the so-called Meta-Previewer and propose the Cascading-Views which are widgets that can assist the end-user in interactively exploring metadata embedded in augmented images. In this regard, the term Interactive Images [1] will refer to those augmented images which allow the end-user to request further information which is in relation to the entire image or parts of it. Using our tools, data exploration process is accomplished following three steps: (i) getting an overview of the image regions that contain additional information, (ii) requesting and displaying the additional information which is of interest, and (iii) diving into that additional information to get even more information linked with it. ©2008 IEEE.

关键词： Metadata

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