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Extending Catmull-Clark Subdivision and PCCM with Polar Structures

Extending Catmull-Clark Subdivision and PCCM with Polar Stru...

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pacific conference on computer graphics and applications

作者： Ashish Myles Kestutis Karciauskas Jorg Peters University of Florida Vilnius University

We complete and bring together two pairs of surface constructions that use polynomial pieces of degree (3,3) to associate a smooth surface with a mesh. The two pairs complement each other in that one extends the subdivisionmodeling paradigm, the other the NURBS patch approach to free-form modeling. Both Catmull-Clark [3] and polar subdivision [7] generalize bi-cubic spline subdivision. Together, they form a powerful combination for smooth object design: while Catmull-Clark subdivision is more suitable where few facets join, polar subdivision nicely models regions where many facets join, as when capping extruded features. We show how to easily combine the meshes of these two generalizations of bi-cubic spline subdivision. A related but different generalization of bi-cubic splines is to model non-tensor-product configurations by a finite set of smoothly connected bi-cubic patches. PCCM [12] does so for layouts where Catmull-Clark would apply. We show that a single NURBS patch can be used where polar subdivision would be applied. This spline is singularly parametrized, but, using a novel technique, we show that the surface is C1 and has bounded curvatures.

关键词： Spline Surface topography Surface reconstruction Fingers Shape control computer graphics Application software Polynomials Industrial relations Nose

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The tenet real-Time protocol suite: A demonstration 94

The tenet real-Time protocol suite: A demonstration

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2nd ACM International conference on Multimedia, MULTIMEDIA 1994

作者： Knightly, Edward Templin, Fred Banerjea, Anindo Mah, Bruce Zhang, Hui Ferrari, Domenico Tenet Group International Computer Science Institute University of California at Berkeley United States

No abstract available.

ISBN: (纸本)0897916867

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A camera control interface based on the visualization of subspaces of the 6D motion space of the camera

A camera control interface based on the visualization of sub...

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pacific conference on computer graphics and applications

作者： Moon-Ryul Jung Doowon Paik Donghyun Kim Department of Computer Science Soongsil University Seoul South Korea Virtual Space Team Human Computing Division Computer Software Tech. Lab. ETRI South Korea

ISBN: (纸本)0818686200

The paper describes a camera control interface for the exploration of 3D virtual space implemented by using a 2D input device, a joystick. The interface uses a helicopter maneuver metaphor: the viewpoint of the virtual camera is controlled as if the user sits in a helicopter and controls its motion. To control the helicopter by a 2D input device, the 6D space of the helicopter motion is decomposed into six 2D subspaces. The 2D subspaces are visualized by means of the helicopter model and some auxiliary means, e.g. plane meshes and circles, to suggest the kind of motion allowed in each subspace. The visualized subspaces are used as camera control widgets controlled by the 2D input device. The six widgets are arranged so that the transition from one widget to another may be performed by one movement of the input device. This interface provides a simple and consistent kinesthetic correspondence between the movement of the joystick and the motion of the helicopter i.e. the virtual camera. We have conducted an evaluation of our camera control interface through a questionnaire study. Though it indicates that users of different levels find our interface easier to use compared to other interfaces, we need more rigorous evaluation studies to prove it. The main claim of the paper is that the proposed interface has a cleaner and more logical design obtained by strictly following a good design principle, i.e. systematic decomposition and intuitive visual clues.

关键词： Cameras Motion control Visualization computer aided manufacturing CADCAM Helicopters computer science Humans Software Programmable logic arrays

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Intelligent mesh scissoring using 3D snakes

Intelligent mesh scissoring using 3D snakes

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pacific conference on computer graphics and applications

作者： Yunjin Lee Seungyong Lee A. Shamir D. Cohen-Or H.P. Seidel POSTECH South Korea Interdisciplinary Center Tel-Aviv University Israel MPI Informatik Germany

Mesh partitioning and parts extraction have become key ingredients for many mesh manipulation applications both manual and automatic. In this paper, we present an intelligent scissoring operator for meshes which supports both automatic segmentation and manual cutting. Instead of segmenting the mesh by clustering, our approach concentrates on finding and defining the contours for cutting. This approach is based on the minima rule, which states that human perception usually divides a surface into parts along the contours of concave discontinuity of the tangent plane. The technique uses feature extraction to find such candidate feature contours. Subsequently, such a contour can be selected either automatically or manually, or the user may draw a 2D line to start the scissoring process. The given open contour is completed to form a loop around a specific part of the mesh, and this loop is used as the initial position of a 3D geometric snake. The snake moves by relaxation until it settles to define the final scissoring position. This process uses several fundamental geometric mesh attributes, such as curvature and centricity, and enables both automatic segmentation and an easy-to-use intelligent-scissoring operator.

关键词： Feature extraction Humans Application software Partitioning algorithms Mesh generation Testing computer graphics

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Exposing homograph obfuscation intentions by coloring unicode strings

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10th Asia pacific conference on Web Technology, APWeb 2008

作者： Wenyin, Liu Fu, Anthony Y. Deng, Xiaotie Department of Computer Science City University of Hong Kong Hong Kong Hong Kong

ISBN: (纸本)3540788484

Unicode has become a useful tool for information internationalization, particularly for applications in web links, web pages, and emails. However, many Unicode glyphs look so similar that malicious guys may utilize this feature to trick people's eyes. In this paper, we propose to use Unicode string coloring as a promising countermeasure to this emerging threat. A coloring algorithm is designed and prototyped to assign colors to a set of required languages/scripts such that each language/script is displayed uniquely in color, while the color difference among different languages is maximized. Based on that, we proposed both fixed and adaptive coloring schemes to render Unicode strings in weblinks and documents so as to distinguish mixed Unicode characters from different language/script groups and vividly illustrate potential Homograph Obfuscation intentions. Our user study shows that it is helpful to remind end users of weirdly displayed strings. © 2008 Springer-Verlag Berlin Heidelberg.

关键词： Three dimensional computer graphics

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A multiscale deformable model for extracting complex surfaces from volume images

A multiscale deformable model for extracting complex surface...

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pacific conference on computer graphics and applications

作者： Joo-Young Park T. McInerney D. Terzopoulos Myoung-Hee Kim Department of Computer Science and Engineering Ewha Womans University Seoul South Korea Department of Computer Science University of Toronto Toronto Canada

Deformable surface models are an attractive method for segmenting the three-dimensional shapes of complex anatomic structures in volumetric medical images. Despite the success of this approach, several problems remain. In this paper, we propose a multiscale deformable surface model with non-intersection constraint forces that successfully addresses three significant problems-sensitivity to model initialization, difficulties in dealing with severe object concavities, and model self-intersection. The first two problems are addressed by the multiscale scheme, which progressively resamples the triangulated, deformable surface model both globally and locally, matching its resolution to the levels of a volume image pyramid. We address the third problem by including a non-intersection constraint force among the customary internal and external forces in the physics-based formulation. We apply our new deformable surface model to the challenging task of extracting brain cortical surfaces.

关键词： Deformable models Image segmentation computer science Biomedical imaging Electronic switching systems Brain modeling Integrated circuit modeling Physics Solid modeling Image resolution

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Dataflow specification for system level synthesis of 3D graphics applications

Dataflow specification for system level synthesis of 3D grap...

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Asia and South pacific Design Automation conference

作者： Chanik Park Sungchan Kim Soonhoi Ha Computer Science and Engineering Seoul National University Seoul South Korea

ISBN: (纸本)0780366336

3D graphics is becoming an important application area together with multimedia applications. The dynamic behavior of 3D graphics application brings new challenges for system level specification and synthesis methodologies. Although existing dataflow models are successfully used for DSP system design, they are not sufficient to deal with 3D graphics algorithms since they are lacking in global state management and dynamic behavior handling. In this paper, we propose an extended synchronous piggybacked dataflow model with dynamic constructs for representing 3D graphics algorithm. We also present implementation techniques for software and hardware synthesis from the specification. With a simple 3D graphics pipeline, we show the novelty and usefulness of the proposed specification model.

关键词： Pipelines Application software Digital signal processing System-level design computer graphics Hardware Formal specifications computer science Electronic mail Power system modeling

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Automatic camera placement for image-based modeling

Automatic camera placement for image-based modeling

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pacific conference on computer graphics and applications

作者： S. Fleishman D. Cohen-Or D. Lischinski Computer Science Department Tel Aviv University Israel Institute of Computer Science Hebrew University Jerusalem Israel

We present an automatic camera placement method for generating image-based models from scenes with known geometry. Our method first approximately determines the set of surfaces visible from a given viewing area and then selects a small set of appropriate camera positions to sample the scene from. We define a quality measure for a surface as seen, or covered, from the given viewing area. Along with each camera position, we store the set of surfaces which are best covered by this camera. Next, one reference view is generated from each reference view that do not belong to the selected set of polygons are masked out. The image-based model generated by our method, covers every visible surface only once, associating it with a camera position from which it is covered with quality that exceeds a user-specified quality threshold. The result is a compact non-redundant image-based model with controlled quality. The problem of covering every visible surface with a minimum number of cameras (guards) can be regarded as an extension to the well-known Art Gallery Problem. However, since the 3D polygonal model is textured, the camera-polygon visibility relation is not binary; instead, it has a weight-the quality of the polygon's coverage.

关键词： Cameras Layout Rendering (computer graphics) Read only memory computer science Image generation Solid modeling Image sampling Computational geometry Area measurement

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Freeform shape representations for efficient geometry processing

Freeform shape representations for efficient geometry proces...

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pacific conference on computer graphics and applications

作者： L. Kobbelt RWTH-Aachen Lehrstuhl fűr Informatik Aachen Germany

Summary form only given. The most important concepts for the handling and storage of freeform shapes in geometry processing applications are parametric representations and volumetric representations. Both have their specific advantages and drawbacks. While the algebraic complexity of volumetric representations is independent from the shape complexity, the domain of a parametric representation usually has to have the same structure as the surface itself (which sometimes makes is necessary to update the domain when the surface is modified). On the other hand, the topology of a parametrically defined surface can be controlled explicitly while in a volumetric representation, the surface topology can change accidentally during deformation. A volumetric representation reduces distance queries or inside/outside tests to mere function evaluations but the geodesic neighborhood relation between surface points is difficult to resolve. As a consequence, it seems promising to combine parametric and volumetric representations to effectively exploit both advantages. In this talk, a number of projects is presented and discussed where such a combination leads to efficient and numerically stable algorithms for the solution of various geometry processing tasks. applications include global error control for mesh decimation and smoothing, topology control for level-set surfaces, mesh repair, and shape modeling with unstructured point clouds.

关键词： Topology Application software Shape control Information geometry Testing Error correction Smoothing methods Clouds computer graphics

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Rendering iridescent colors appearing on natural objects

Rendering iridescent colors appearing on natural objects

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pacific conference on computer graphics and applications

作者： H. Hirayama Y. Yamaji K. Kaneda H. Yamashita Y. Monden Faculty of Engineering Hiroshima University Japan Interdisciplinary Faculty of Science and Engineering Shimane University Japan

ISBN: (纸本)0769508685

Iridescent colors appearing on natural objects, such as the feathers of a hummingbird, surfaces inside seashells, and shells of beetles, are beautiful and impressive. The cause of such iridescent colors is interference of light inside multilayer film structures covering the natural objects. The paper proposes a method for realistically rendering iridescent colors appearing on natural surfaces, taking into account interference of light inside multilayer structures. To render the iridescent colors, we have developed an illumination model for multilayer structures fluctuated through the use of a hypertexture. We also have improved the hypertexture to be able to represent fluctuated parametric curved surfaces. Several examples of iridescent colors on the surfaces of a seashell and a beetle demonstrate the usefulness of the proposed method.

关键词： Nonhomogeneous media Interference Rendering (computer graphics) Optical films Feathers computer graphics Lighting Surface texture Clouds Optical refraction

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