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computer-assisted auto coloring by region matching

Computer-assisted auto coloring by region matching

引用

pacific conference on computer graphics and applications

作者： Jie Qiu Hock Soon Seah Feng Tian Quan Chen K. Melikhov Center for Graphics and Imaging Technology Nanyang Technological University Singapore

ISBN: (纸本)0769520286

computer-assisted auto coloring (CAAC) has great potential in terms of lowering production cost and saving time in cel animation production. In this paper, a novel approach to automatically color the animation character of line drawings based on region matching and master frames is proposed. Firstly, some important attributes of a region such as curve length, character points, area etc. are investigated. Then, based on these attributes, a detailed process of region matching is presented followed by the coloring process. The results show that our approach can straightforwardly handle most cases, hence the aim of saving time and labor is realized.

关键词： Animation Costs computer graphics Production systems Color Mice Shape Painting Humans Testing

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Topology-preserving simplification of 2D nonmanifold meshes with embedded structures

Topology-preserving simplification of 2D nonmanifold meshes ...

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13th pacific conference on computer graphics and applications

作者： Vivodtzev, F Bonneau, GP Le Texier, P INRIA Rhone Alpes INP Genoble CNRS UJFLab GRAVIR F-38334 Saint Ismier France CEA CESTA F-33114 Le Barp France

Mesh simplification has received tremendous attention over the years. Most of the previous work in this area deals with a proper choice of error measures to guide the simplification. Preserving the topological characteristics of the mesh and possibly of data attached to the mesh is a more recent topic and the subject of this paper. We introduce a new topology-preserving simplification algorithm for triangular meshes, possibly nonmanifold, with embedded polylines. In this context, embedded means that the edges of the polylines are also edges of the mesh. The paper introduces a robust test to detect if the collapse of an edge in the mesh modifies either the topology of the mesh or the topology of the embedded polylines. This validity test is derived using combinatorial topology results. More precisely, we define a so-called extended complex from the input mesh and the embedded polylines. We show that if an edge collapse of the mesh preserves the topology of this extended complex, then it also preserves both the topology of the mesh and the embedded polylines. Our validity test can be used for any 2-complex mesh, including nonmanifold triangular meshes, and can be combined with any previously introduced error measure. Implementation of this validity test is described. We demonstrate the power and versatility of our method with scientific data sets from neuroscience, geology, and CAD/CAM models from mechanical engineering.

关键词： computational geometry and its applications LOD techniques multiresolution curves and surfaces

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Variance invariant adaptive temporal supersampling for motion blurring

Variance invariant adaptive temporal supersampling for motio...

引用

pacific conference on computer graphics and applications

作者： D. Neilson Yee-Hong Yang Computer Graphics Research Group Department of Computing Science University of Alberta Canada

Adaptive temporal sampling, used to create motion blur in distributed ray tracing, generates more sample points in regions with motion blur than in regions without motion blur. When the number of sample points used on stationary objects in regions with motion blur exceeds the number of sample points used in other regions of the image, the variance in the color of the object can differ between the two regions. This paper identifies the cause of this variance discrepancy, and proposes a modification to existing adaptive temporal sampling algorithms which eliminated it. Our results demonstrate that the variance of stationary objects remains approximately the same throughout the entire image and that the proposed modification is capable of improving the running time of existing adaptive temporal sampling algorithms.

关键词： Image sampling Ray tracing computer graphics Rendering (computer graphics) Optical reflection Layout Equations Pixel Distributed computing Sampling methods

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Simple and Efficient Mesh Editing with Consistent Local Frames

Simple and Efficient Mesh Editing with Consistent Local Fram...

引用

pacific conference on computer graphics and applications

作者： Nikolas Paries Patrick Degener Reinhard Klein Institute of Computer Science II University of Bonn Germany

ISBN: (纸本)9780769530093;0769530095

Mesh editing methods based on differential surface representations are known for their efficiency and ease of implementation. For reconstruction from such representations, local frames have to be determined which is a nonlinear problem. In linear approximations frames can either degenerate or become inconsistent with the geometry. Both results in contra-intuitive deformations. Existing nonlinear approaches, however, are comparatively slow and considerably more complex. In this paper we present a differential representation that implicitly enforces orthogonal and geometry consistent frames while allowing a simple and efficient implementation. In particular, it enforces conformal surface deformations preserving local texture features.

关键词： Surface reconstruction Geometry Laplace equations Linear approximation Shape computer graphics Application software computer science Surface texture Reconstruction algorithms

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Visualization of multidimensional, multivariate volume data using hardware-accelerated non-photorealistic rendering techniques

Visualization of multidimensional, multivariate volume data ...

引用

pacific conference on computer graphics and applications

作者： A. Stompel E.B. Lum Kwan-Liu Ma University of California 슠Davis USA

This paper presents a set of feature enhancement techniques. coupled with hardware-accelerated non-photorealistic rendering for generating more perceptually effective visualizations of multidimensional, multivariate volume data, such as those obtained from typical computational fluid dynamics simulations. For time-invariant data, one or more variables are used to either highlight important features in another variable, or add contextural information to the visualization. For time-varying data, rendering of each time step also takes into account the values at neighboring time steps to reinforce the perception of the changing features in the data over time. With hardware-accelerated rendering, interactive visualization becomes possible leading to increased explorability and comprehension of the data.

关键词： Data visualization Multidimensional systems Rendering (computer graphics) Hardware Computational fluid dynamics Acceleration Computational modeling Application software computer graphics Animation

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Line-art rendering of 3D-models

Line-art rendering of 3D-models

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pacific conference on computer graphics and applications

作者： C. Rossl L. Kobbelt Max Planck Institute of Computer Science Saarbrucken Germany

We present an interactive system for computer aided generation of line art drawings to illustrate 3D models that are given as triangulated surfaces. In a preprocessing step, an enhanced 2D view of the scene is computed by sampling for every pixel the shading, the normal vectors and the principal directions obtained from discrete curvature analysis. Then streamlines are traced in the 2D direction fields and are used to define line strokes. In order to reduce noise artifacts, the user may interactively select sparse reference lines and the system will automatically fill in additional strokes. By exploiting the special structure of the streamlines, an intuitive and simple tone mapping algorithm can be derived to generate the final rendering.

关键词： Art Rendering (computer graphics) Layout Interactive systems Sampling methods Noise reduction Streaming media Tail Focusing Stress

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Topology recognition of 3D closed freeform objects based on topological graphs

Topology recognition of 3D closed freeform objects based on ...

引用

pacific conference on computer graphics and applications

作者： D. Steiner A. Fischer CMSR Laboratory for Computer Graphics and CAD Department of Mechanical Engineering Technion-Israel Institute of Technology Haifa Israel

ISBN: (纸本)0769512275

Reverse engineering (RE) deals with an enormous number of irregular and scattered digitized points that require intensive processing in order to reconstruct the surfaces of an object. Surface reconstruction of freeform objects is based on geometrical and topological criteria. Current fitting methods reconstruct an object using a bottom-up approach, from points to a dense mesh, and finally into smoothed connected freeform sub-surfaces. This type of reconstruction, however, can cause topological problems that lead to undesired surface fitting results. Such problems are particularly common with concave shapes. To avoid problems of this type, the paper proposes a new method that automatically detects the topological structure of an object as a base for surface fitting. The topological reconstruction method described in the paper is based on two stages: (1) creating 3D non-self-intersecting iso-curves from a 3D triangular mesh and (2) extracting a topological graph. The feasibility of the proposed topological reconstruction method is demonstrated on several examples using freeform objects with complex topologies.

关键词： Topology Surface fitting Surface reconstruction Shape Reconstruction algorithms Reverse engineering Laboratories computer graphics Mechanical engineering Scattering

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Real-time consensus-based scene reconstruction using commodity graphics hardware

Real-time consensus-based scene reconstruction using commodi...

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pacific conference on computer graphics and applications

作者： Ruigang Yang G. Welch G. Bishop Department of Computer Science North Carolina State University Chapel Hill USA

ISBN: (纸本)0769517846

We present a novel use of commodity graphics hardware that effectively combines a plane-sweeping algorithm with view synthesis for real-time, on-line 3D scene acquisition and view synthesis. Using real-time imagery from a few calibrated cameras, our method can generate new images from nearby viewpoints, estimate a dense depth map from the current viewpoint, or create a textured triangular mesh. We can do this without prior geometric information or requiring any user interaction, in real time and on line. The heart of our method is using programmable pixel shader technology to square intensity differences between reference image pixels, and then to choose final colors (or depths) that correspond to the minimum difference, i.e. the most consistent color. In this paper we describe the method, place it in the context of related work in computer graphics and computer vision, and present results.

关键词： Layout Hardware Pixel Image reconstruction Cameras Image generation Mesh generation Heart computer graphics computer vision

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A practical and flexible tiled display system

A practical and flexible tiled display system

引用

pacific conference on computer graphics and applications

作者： M.S. Brown W.B. Seales Department of Computer Science Hong Kong University of Science and Technology Kowloon Hong Kong China Department of Computer Science University of Kentucky Lexington KY USA

computer graphics and high-resolution digital imagery are becoming increasingly pervasive in communities not traditionally associated with graphics. Commodity graphics cards and digital cameras, along with powerful modeling software, allow organizations such as libraries, museums, and small businesses to produce expressive and realistic computer generated imagery, far surpassing the capabilities of current desktop monitors. What remains elusive to these groups is access to affordable and easy to use large format display technology. We present a practical system for deploying flexible projector based tiled displays. Our framework integrates two key components: (1) self-calibrating display geometry with real-time geometric correction and (2) PC-based distributed rendering that supports an established graphics API. Our system's display geometry is easy to configure and reconfigure, accommodates casually tiled projectors and arbitrary display surfaces, and can be operational in a matter of minutes. In addition, the underlying distributed rendering architecture (WireGL) is transparent to existing OpenGL applications, requiring no custom APIs or re-compilation of existing OpenGL executables. In short, we present a practical and flexible low-cost tiled display system that is simple to deploy and easy to operate.

关键词： computer displays computer graphics Geometry Rendering (computer graphics) Digital images Digital cameras Power system modeling Software libraries Image generation Power generation

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The Soft Shadow Occlusion Camera

The Soft Shadow Occlusion Camera

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pacific conference on computer graphics and applications

作者： Qi Mo Voicu Popescu Chris Wyman University of Iowa USA Purdue University USA

A fundamental challenge for existing shadow map based algorithms is dealing with partially illuminated surfaces. A conventional shadow map built with a pinhole camera only determines a binary light visibility at each point, and this all-or-nothing approach to visibility does not capture penumbral regions. We present an interactive soft shadow algorithm based on a variant of the depth discontinuity occlusion camera, a non-pinhole camera with rays that reach around blockers to sample normally hidden surfaces. Our soft shadow occlusion camera (SSOC) classifies a fragment on a continuum from fully visible to fully hidden, as seen from the light. The SSOC is used directly in fragment illumination computation without building an explicit "soft shadow map." This method renders plausible soft shadows at interactive speeds under fully dynamic conditions.

关键词： Cameras Layout Lighting Costs Rendering (computer graphics) computer graphics Application software Light sources Sampling methods

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