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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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Visual Contrast Sensitivity and Discrimination for 3D Meshes and their applications

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computer graphics FORUM 2016年第7期35卷 497-506页

作者： Nader, G. Wang, K. Hetroy-Wheeler, F. Dupont, F. Univ Lyon LIRIS UMR CNRS 5205 Lyon France Univ Grenoble Alpes CNRS GIPSA Lab F-38000 Grenoble France Univ Grenoble Alpes LJK F-38000 Grenoble France Inria Rocquencourt France

In this paper, we first introduce an algorithm for estimating the visual contrast on a 3D mesh. We then perform a series of psychophysical experiments to study the effects of contrast sensitivity and contrast discrimination of the human visual system for the task of differentiating between two contrasts on a 3D mesh. The results of these experiments allow us to propose a perceptual model that is able to predict whether a change in local contrast on 3D mesh, induced by a local geometric distortion, is visible or not. Finally, we illustrate the utility of the proposed perceptual model in a number of applications: we compute the Just Noticeable Distortion (JND) profile for smooth-shaded 3D meshes and use the model to guide mesh processing algorithms.

关键词： Mesh generation

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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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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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Illumination Brush: Interactive Design of All-Frequency Lighting

Illumination Brush: Interactive Design of All-Frequency Ligh...

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pacific conference on computer graphics and applications

作者： Makoto Okabe Yasuyuki Matsushita Li Shen Takeo Igarashi University of Tokyo Japan Microsoft Research Asia China SORST Japan Science and Technology Agency Japan

We present an appearance-based user interface for artists to efficiently design customized image-based lighting environments. 1 Our approach avoids typical iterations of parameter editing, rendering, and confirmation by providing a set of intuitive user interfaces for directly specifying the desired appearance of the model in the scene. Then the system automatically creates the lighting environment by solving the inverse shading problem. To obtain a realistic image, all-frequency lighting is used with a spherical radial basis function (SRBF) representation. Rendering is performed using precomputed radiance transfer (PRT) to achieve a responsive speed. User experiments demonstrated the effectiveness of the proposed system compared to a previous approach.

关键词： Lighting Brushes Rendering (computer graphics) Layout User interfaces Paints Asia Geometry computer graphics Application software

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Accurate surface voxelization for manipulating volumetric surfaces and solids with application in simulating musculoskeletal surgery

Accurate surface voxelization for manipulating volumetric su...

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pacific conference on computer graphics and applications

作者： Ming-Dar Tsai Shyan-Bin Jou Ming-Shium Hsieh Institute of Information and Computer Engineering Chung Yuan Christian University Taiwan Orthopaedics and Traumatology Department Taipei Medical University Hospital Taipei Medical University Taiwan

ISBN: (纸本)0769512275

Existing volumetric representations model a non-thickness surface using voxels, and thus cannot accurately manipulate topology changes in the interactions between surfaces and solids. The study describes a volume representation in which face flags and distance-levels on each voxel represent surface topology and geometry, and an object flag identifies solids. Also presented is a set of algorithms that voxelize solids and surfaces, check the closures of the interactions among the volumetric surfaces and solids and manipulate various operations on the solids. A surgical example, in which the procedures involved in the complex interactions between cutting surfaces and anatomic structures and various geometric and topologic manipulations on the structures, are simulated to demonstrate that these novel volume representation techniques and algorithms are feasible in manipulating the interactions between surfaces and solids in a volume.

关键词： Solid modeling Computational modeling Topology Application software Orthopedic surgery Joining materials Floods computer simulation Musculoskeletal system Geometry

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Point-Based Minkowski Sum Boundary

Point-Based Minkowski Sum Boundary

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pacific conference on computer graphics and applications

作者： Jyh-Ming Lien George Mason University Fairfax VA USA

ISBN: (纸本)9780769530093;0769530095

Minkowski sum is a fundamental operation in many geometric applications, including robotics, penetration depth estimation, solid modeling, and virtual prototyping. However, due to its high computational complexity and several nontrivial implementation issues, computing the exact boundary of the Minkowski sum of two arbitrary polyhedra is generally a difficult task. In this work, we propose to represent the boundary of the Minkowski sum approximately using only points. Our results show that this point-based representation can be generated efficiently. An important feature of our method is its straightforward implementation and parallelization. We also demonstrate that the point-based representation of the Minkowski sum boundary can indeed provide similar functionality as mesh-based representations can. We show several applications in motion planning, penetration depth approximation and modeling.

关键词： Filters Application software Robots Solid modeling Virtual prototyping Robustness computer graphics Computational complexity Yarn Surface morphology

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An effective feature-preserving mesh simplification scheme based on face constriction

An effective feature-preserving mesh simplification scheme b...

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pacific conference on computer graphics and applications

作者： Jian-Hua Wu Shi-Min Hu Chiew-Lan Tai Jia-Guang Sun Department of Computer Science and Technology Tsinghua University Beijing China Department of Computer Science Hong Kong University of Science and Technology Hong Kong China

ISBN: (纸本)0769512275

A novel mesh simplification scheme that uses the face constriction process is presented. By introducing a statistical measure that can distinguish triangles having vertices of high local roughness from triangles in flat regions into our weight-ordering equation, along with other heuristics, our scheme can better preserve visually important features in the original mesh. To improve the shape quality of triangles, we adopt nonlinear face area sensitivity in the weight ordering. A learning and feedback mechanism is also utilized to enhance user controllability. The computations are simple, making our scheme time-effective and easy to implement. In addition to comparing our scheme with other mesh simplification algorithms empirically, we compare their performances by establishing a unifying ground among three basic simplification processes: decimate vertex, collapse edge, and constrict face. This unification allows us to analyze the intrinsic merits and demerits of simplification algorithms to help users make better selections.

关键词： graphics computer science Feedback Controllability Algorithm design and analysis Nonlinear equations Shape Workstations Laser modes Rendering (computer graphics)

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Radiometric Compensation through Inverse Light Transport

Radiometric Compensation through Inverse Light Transport

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pacific conference on computer graphics and applications

作者： Gordon Wetzstein Oliver Bimber Bauhaus-Universität Weimar Weimar Germany University of British Columbia Canada

ISBN: (纸本)9780769530093;0769530095

Radiometric compensation techniques allow seamless projections onto complex everyday surfaces. Implemented with projector-camera systems they support the presentation of visual content in situations where projection-optimized screens are not available or not desired - as in museums, historic sites, air-plane cabins, or stage performances. We propose a novel approach that employs the full light transport between projectors and a camera to account for many illumination aspects, such as interreflections, refractions, shadows, and defocus. Precomputing the inverse light transport in combination with an efficient implementation on the GPU makes the real-time compensation of captured local and global light modulations possible.

关键词： Radiometry Lighting Cameras Layout Application software Optical modulation Calibration Geometry computer graphics Optical refraction

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Using intel streaming SIMD extensions for 3D geometry processing 3rd

Using intel streaming SIMD extensions for 3D geometry proces...

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3rd IEEE pacific Rim conference on Multimedia, PCM 2002

作者： Ma, Wan-Chun Yang, Chia-Lin Dept. of Computer Science and Information Engineering National Taiwan University Taiwan

ISBN: (纸本)3540002626

Three dimensional (3D) graphics applications is an important workload running on today’s computer system. A cost-effective graphics solution is to use a general processor for 3D geometry processing and a specialized hardware for rasterization. 3D geometry processing is an inherently parallel task. Therefore, many CPU vendors add SIMD (Single Instruction Multiple Data) instruction extensions to accelerate 3D geometry processing. In this paper, we evaluate the performance impact of using the Intel Streaming SIMD Extensions (SSE) for 3D geometry processing. We use SIMD-FP to improve the computational throughput by processing four vertices in parallel. We find that the layout of vertices in memory is important for the effectiveness of SIMD-FP. We also study the effect of using prefetch instructions to improve the memory performance. The experimental results show that using Intel SSE can achieve close to 4x speedup for geometry processing. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Cost effectiveness

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