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Freeform Image

Freeform Image

引用

pacific conference on computer graphics and applications

作者： Thomas Schiwietz Joachim Georgii Rudiger Westermann Siemens Corporate Research Imaging & Visualization Princeton USA Computer Graphics & Visualization Technische Universität München Munich Germany

ISBN: (纸本)9780769530093;0769530095

In this paper we present a technique for image deformation in which the user is given flexible control over what kind of deformation to perform. Freeform image extends available image deformation techniques in that it provides a palette of intuitive tools including interactive object segmentation, stiffness editing and force-based controls to achieve both a natural look and realistic animations of deforming parts. The model underlying our approach is physics-based and it is amenable to a variety of different kinds of image manipulations ranging from as-rigid- as-possible to fully elastic deformations. We have developed a multigrid solver for quadrangular finite elements, which achieves real-time performance for high resolution pixel grids. On recent CPUs this solver can handle about 16K co-rotated finite elements at roughly 60 ms.

关键词： computer graphics Visualization Force control Finite element methods Shape control Interpolation Application software Object segmentation Animation Deformable models

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Interactive Global Illumination Using Implicit Visibility

Interactive Global Illumination Using Implicit Visibility

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pacific conference on computer graphics and applications

作者： Zhao Dong Jan Kautz Christian Theobalt Hans-Peter Seidel MPI Informatik Germany University College London UK University of Stanford USA

ISBN: (纸本)9780769530093

Rendering global illumination effects for dynamic scenes at interactive frame rates is a computationally challenging task. Much of the computation time needed is spent during visibility queries between individual scene elements, and it is almost illusive to update this information at realtime even for moderately complex scenes. In this paper, we propose a global illumination approach for dynamic scenes that runs at near-real-time frame rates on a single PC. Our method is inspired by the principles of hierarchical radiosity and tackles the visibility problem by implicitly evaluating mutual visibility while constructing a hierarchical link structure between scene elements. By means of the same efficient and easy-to-implement framework, we are able to reproduce a large variety of complex lighting effects for moderately sized scenes, such as interreflections, environment map lighting as well as area light sources.

关键词： Lighting Layout Ray tracing Light sources Finite element methods Geometry computer graphics Application software Educational institutions Rendering (computer graphics)

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Using texture synthesis for non-photorealistic shading from paint samples

Using texture synthesis for non-photorealistic shading from ...

引用

pacific conference on computer graphics and applications

作者： C.D. Kulla J.D. Tucek R.J. Bailey C.M. Grimm Washington University Saint Louis USA

This paper presents several methods for shading meshes from scanned paint samples that represent dark to light transitions. Our techniques emphasize artistic control of brush stroke texture and color. We first demonstrate how the texture of the paint sample can be separated from its color gradient. We demonstrate three methods, two real-time and one off-line, for producing rendered, shaded images from the texture samples. All three techniques use texture synthesis to generate additional paint samples. Finally, we develop metrics for evaluating how well each method achieves our goal in terms of texture similarity, shading correctness and temporal coherence.

关键词： Paints Rendering (computer graphics) computer graphics Animation Painting Strips Nonlinear distortion Shape Brushes Application software

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Stream bubbles for steady flow visualization

Stream bubbles for steady flow visualization

引用

pacific conference on computer graphics and applications

作者： Bing Zhang A. Pang Computer Science Department University of California Santa Cruz CA USA

ISBN: (纸本)0769512275

This paper introduces a new relatively inexpensive technique - stream bubbles for 3D flow visualization. The physical analogy to this technique are bubbles that can be observed in nature with different shapes and varying speeds. A stream bubble is a surface, defined by a small set of vertices, advected through a flow field. It can easily manifest flow features like twist, stretch, expansion and rotation. Upon encountering an obstacle, stream bubbles will automatically erode and/or split in an intuitively geometric way. For highly divergent and vortical fields, it can also break apart based on the aspect ratio of the bounding volume. When two or more stream bubbles meet, no explicit merge operation is needed since the surfaces will simply intersect each other to form a composite surface. No effort is made to make the intersection smooth. Stream bubbles may be of different sizes. Larger bubbles give a coarse global view of the flow structure, while smaller ones give a more accurate depiction. In addition, our interface provides an interactive, multi-resolution visualization environment facilitated with an animated or step-by-step playback function.

关键词： Visualization Computational fluid dynamics Filling Sampling methods computer science HTML Shape Animation Spline Surface topography

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Volumetric modeling of colored pencil drawing

Volumetric modeling of colored pencil drawing

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pacific conference on computer graphics and applications

作者： S. Takgi I. Fujishiro M. Nakajima Dept. of Comput. Sci. Tokyo Inst. of Technol. Japan Department of Information Sciences Ochanomizu University Bunkyo Tokyo Japan Department of Computer Science Tokyo Institute of Technology Meguro Tokyo Japan

Not only photorealistic rendering but non-photorealistic rendering is considered an important research topic in artistic image synthesis. However, little attention has been given to colored pencil drawing. This paper proposes a volume graphics model for colored pencil drawing. The model consists of three sub-models, which describe in a volumetric fashion, the microstructure of paper, pigment distribution on paper, and pigment redistribution, respectively. The model takes advantage of volumetric offset distance accessibility and line integral convolution, and thus is highly controllable with a small number of parameters. A couple of synthesized color pencil drawing data sets are rendered using an existing volume visualizer to empirically prove that the model is descriptive enough to produce realistic images of colored pencil drawing.

关键词： Pigmentation Painting Rendering (computer graphics) Eyes computer science Image generation graphics Microstructure Data visualization Petroleum

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Health Informatics and Medical Systems and Biomedical Engineering 1

Health Informatics and Medical Systems and Biomedical Engine...

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丛书名： Communications in computer and Information Science

1000年

作者： Abeer Alsadoon Farzan Shenavarmasouleh Soheyla Amirian Farid Ghareh Mohammadi Hamid R. Arabnia Leonidas Deligiannidis

ISBN: (数字)9783031859083

ISBN: (纸本)9783031859076

This book constitutes the proceedings of the 10th International conference on Health Informatics and Medical Systems and the 10th International conference on Biomedical Engineering, BIOENG 2024, held as part of the 2024 World Congress in computer Science, computer Engineering and Applied Computing, in Las Vegas, USA, during July 22 to July 25, 2024. The 31 HIMS 2024 papers included were carefully reviewed and selected from 141 submissions. BIOENG 2024 received 78 submissions and accepted 13 papers for inclusion in the proceedings. The papers have been organized in topical sections as follows: Biomedical engineering; algorithms, applications and methodologies; health informatics and medical systems; and algorithms, applications and methodologies.

关键词： Systems and Data Security Software Engineering/Programming and Operating Systems computer Imaging, Vision, Pattern Recognition and graphics Artificial Intelligence computer Science, general

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Image Talk: a real time synthetic talking head using one single image with Chinese text-to-speech capability

Image Talk: a real time synthetic talking head using one sin...

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pacific conference on computer graphics and applications

作者： Woei-Luen Perng Yungkang Wu Ming Ouhyoung Communication and Multimedia Laboratory Department Of Computer Science and Information Engineering National Taiwan University Taipei Taiwan

ISBN: (纸本)0818686200

Image Talk uses a single image to automatically create talking sequences in real time. The image can be acquired from a photograph, video clip, or hand drawn characters. This interactive system accepts Chinese text and talks back in Mandarin Chinese, generating facial expression in real time. Image Talk analyzes Chinese text by converting it to a standard Pinyin system used in Taiwan and fetches the associated facial expressions from an expression pool. The expressions are synchronized with the sound and played back in a talking sequence. Image Talk also incorporates eye blinking, small scale head rotation and translation perturbations, to make the resulting sequence more natural. It is also easy to switch to any other face images. The result is quite entertaining, and can easily be used as a new human machine interface, as well as for lip sync in computer animated characters.

关键词： Speech synthesis Humans Facial animation Head Read only memory Interactive systems Eyes Motion pictures Multimedia communication Laboratories

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VISBONE: 3D visualization of bone mineral density

VISBONE: 3D visualization of bone mineral density

引用

pacific conference on computer graphics and applications

作者： Yi-King Choi J.C.Y. Leong W.W. Lu Weuping Wang Department of Computer Science and Information Systems University of Hong Kong Hong Kong China Department of Orthopaedic Surgery University of Hong Kong Hong Kong China

Volume visualization is an essential part of many computer-assisted medical applications. While general-purpose commercial visualization software can provide common functions for visualizing three-dimensional (3D) medical data, there are many occasions where specific requirements cannot be fulfilled by such software. In orthopaedic surgery involving screw insertion, surgeons must consider not only the surface topology but also the bone mineral density (BMD) distribution to ensure a high success rate of the operation. In this paper we present a new system, called VISBONE, for visualizing the 3D BMD distribution within a bone. Design issues and specific considerations required by this application are discussed.

关键词： Bones Minerals Fasteners Orthopedic surgery Biomedical imaging Data visualization Computed tomography computer science Information systems computer applications

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QAS: Real-Time Quadratic Approximation of Subdivision Surfaces

QAS: Real-Time Quadratic Approximation of Subdivision Surfac...

引用

pacific conference on computer graphics and applications

作者： Tamy Boubekeur Christophe Schlick LaBRI-INRIA University of Bordeaux 1 France

ISBN: (纸本)9780769530093;0769530095

We introduce QAS, an efficient quadratic approximation of subdivision surfaces which offers a very close appearance compared to the true subdivision surface but avoids recursion, providing at least one order of magnitude faster rendering. QAS uses enriched polygons, equipped with edge vertices, and replaces them on-the-fly with low degree polynomials for interpolating positions and normals. By systematically projecting the vertices of the input coarse mesh at their limit position on the subdivision surface, the visual quality of the approximation is good enough for imposing only a single subdivision step, followed by our patch fitting, which allows real-time performances for million polygons output. Additionally, the parametric nature of the approximation offers an efficient adaptive sampling for rendering and displacement mapping. Last, the hexagonal support associated to each coarse triangle is adapted to geometry processors.

关键词： Geometry Polynomials Surface fitting Mesh generation Rendering (computer graphics) computer graphics Application software Real time systems Sampling methods Hardware

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Intuitive virtual grasping for non haptic environments

Intuitive virtual grasping for non haptic environments

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pacific conference on computer graphics and applications

作者： T. Ullmann J. Sauer Department of Computer Science and Automation Computer Graphics Program Technical University Ilmenau Ilmenau Germany Commercial Vehicle Development DaimlerChrysler Aerospace Sindelfingen Germany Virtual Reality Competence Center Daimler Chrysler Research and Technology Center Ulm Germany

This paper presents an approach for grasping virtual objects in virtual environments with a data glove. Our focus lies on developing new methods that allow sensible realistic grasping gestures which correspond to human grasping behavior. To meet the demands of industrial applications, users must be able to grasp an object in an intuitive way with one or two hands and, beyond that, manipulate grasped objects between their fingers. To avoid the use of expensive force or touch feedback hardware, but also to ensure a safe grip on virtual objects, several forms of visual feedback are provided. First, we describe the basic algorithm for grasping with one or two hands and finally, we present a method to precisely manipulate the grasped objects between the virtual fingers.

关键词： Grasping Haptic interfaces Data gloves Virtual reality Virtual environment Fingers Force feedback Hardware Application software Engines

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