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ISpace: interactive volume data classification techniques using independent component analysis

ISpace: interactive volume data classification techniques us...

引用

pacific conference on computer graphics and applications

作者： I. Takanashi E.B. Lum Kwan-Liu Ma S. Muraki Mitsubishi Electric Corporation Information Technology Research and Development Center Japan CIPIC University of California Davis CA USA CIPIC & Department of Computer Science University of California Davis USA National Institute for Advanced Industrial Science and Technology Tsukuba Japan

This paper introduces an interactive classification technique for volume data, called ISpace, which uses Independent Component Analysis (ICA) and a multidimensional histogram of the volume data in a transformed space. Essentially, classification in the volume domain becomes equivalent to interactive clipping in the ICA space, which as demonstrated using several examples is more intuitive and direct for the user to classify data. The result is an opacity transfer function defined for rendering multivariate scalar volume data.

关键词： Independent component analysis Transfer functions Image segmentation Space technology Histograms Biomedical imaging Data visualization Rendering (computer graphics) Biological materials Information technology

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Blending multiple views

Blending multiple views

引用

pacific conference on computer graphics and applications

作者： R. Raskar Kok-Lim Low Mitsubishi Electric Research Laboratories Inc. USA University of North Carolina Chapel Hill USA

Current blending methods in image-based rendering use local information such as "deviations from the closest views" to find blending weights. They include approaches such as the view-dependent texture mapping and blending fields used in unstructured lumigraph rendering. However, in the presence of depth discontinuities, these techniques do not provide smooth transitions in the target image if the intensities of corresponding pixels in the source images are significantly different (e.g. due to specular highlights). In this paper, we present an image blending technique that allows the use of global visibility and occlusion constraints. Each blending weight now has a global component and a local component, which are due to the view-independent and view-dependent contributions of the source images, respectively. Being view-independent, the global components can be computed in a preprocessing stage. Traditional graphics hardware is exploited to accelerate the computation of the global blending weights.

关键词： Cameras Layout Rendering (computer graphics) Pixel Geometry graphics Solid modeling Hardware Acceleration Interpolation

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Fast soft shadow visualization for deformable moving light sources using adaptively sampled light field shadow maps

Fast soft shadow visualization for deformable moving light s...

引用

pacific conference on computer graphics and applications

作者： E.K.-Y. Jeng Zhigang Xiang Department of Computer Science CUNY Graduate Center USA Department of Computer Science CUNY USA

This is a two-stage soft shadow visualization technique for deformable moving area light sources using adaptively sampled light field shadow maps. In the pre-processing stage, we create a slab of shadow maps for the sample points in a light template. To reduce storage costs, our adaptive sampling method stores each map in a quadtree and only stores fine details from those areas that need them. In the dynamic visualization stage, we make use of the shadow maps to efficiently construct/update the shadowed image. Once the scene is processed for the initial lighting setup, a new lighting setup can be computed even more rapidly if most of the light points do not change.

关键词： Visualization Light sources Layout Slabs Optical attenuators computer science Sampling methods Rendering (computer graphics) Optical arrays Educational institutions

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Physically-based simulation of cracks on drying 3D solid

Physically-based simulation of cracks on drying 3D solid

引用

pacific conference on computer graphics and applications

作者： K. Aoki Ngo Hai Dong T. Kaneko S. Kuriyama Department of Information and Computer Science Toyohashi University of Technology Toyohashi Aichi Japan

This paper describes a new physically based method for synthesizing 3D cracking patterns in clay solids by incorporating a moisture model. We measure temporal transitions of the physical parameters used in the model. Then we describe a new approach to synthesize cracking patterns in a 3D freeform object by its approximate quantized shape and the mesh relation of its original shape. With this new method, an animated synthesis of not only external cracks but also internal cracks of 3D freeform solids is possible.

关键词： Solid modeling Moisture Shape Springs Equations Surface cracks Visualization Animation Layout Computational modeling

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Interactive visualization of non-manifold implicit surfaces using pre-integrated volume rendering

Interactive visualization of non-manifold implicit surfaces ...

引用

pacific conference on computer graphics and applications

作者： S. Yamazaki K. Kase K. Ikeuchi University of Tokyo Riken Japan Riken Japan University of Tokyo Japan

We present an interactive method of visualizing both manifold and non-manifold implicit surfaces. The implicit surfaces are directly visualized at interactive frame rates independent of surface complexity by the hardware-accelerated volume rendering method. Although conventional implicit surfaces can represent only two-manifold surfaces, we have developed a technique of representing non-manifold surfaces as implicit surfaces by applying segmented distance field. Implicit surfaces represented by this definition can be rendered by pre-integrated volume rendering using vertex generation diagrams as pre-integration table. We also developed a system for visualizing the implicit surfaces and have confirmed that it can render surfaces at sufficient quality and speed.

关键词： Visualization Topology Equations Isosurfaces Solid modeling Geometry Acceleration computer graphics Application software

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A method of human short hair modeling and real time animation

A method of human short hair modeling and real time animatio...

引用

pacific conference on computer graphics and applications

作者： Yang Guang Huang Zhiyong Volume Interactions Singapore Department of Computer Science School of Computing National University of Singapore Singapore

ISBN: (纸本)0769517846

This paper describes a method of human short hair modeling and real time animation. A method is proposed to model short hair. First, a hair style model is derived from a scalp model interactively. The hair model is then derived automatically from the hair style and scalp models. Texture mapping is applied to the hair model for a better visual effect. For animation, a method is proposed based on an approximation of the accurate physically-based hair model, from which 3D morphing key shapes are derived. Intermediate shapes are then computed by applying 3D morphing. We have implemented it and compared the results with real hair. The visual quality and frame rate are satisfactory for real time applications.

关键词： Humans Hair Animation Shape Scalp Visual effects Strips Fluid dynamics computer science Deformable models

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An efficient brush model for physically-based 3D painting

An efficient brush model for physically-based 3D painting

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pacific conference on computer graphics and applications

作者： N.S.-H. Chu Chiew-Lan Tai Department of Computer Science Hong Kong University of Science and Technology Kowloon Hong Kong China

This paper presents a novel 3D brush model consisting of a skeleton and a surface, which is deformed through constrained energy minimization. The main advantage of our model over existing ones is in its ability to mimic brush flattening and bristle spreading due to brush bending and lateral friction exerted by the paper surface during the painting process. The ability to recreate such deformations is essential to realistic 3D digital painting simulations, especially in the case of Chinese brush painting and calligraphy. To further increase realism, we also model the plasticity of wetted brushes and the resistance exerted by pores on the paper surface onto the brush tip. Our implementation runs on a consumer-level PC in real-time and produces very realistic results.

关键词： Brushes Painting Deformable models Surface resistance Art Rendering (computer graphics) Spline computer science Skeleton Friction

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The light field oracle

The light field oracle

引用

pacific conference on computer graphics and applications

作者： R. Lutolf B. Schiele M.H. Gross Department of Computer Science Zurich Switzerland

We present the light field oracle, a novel mathematical concept for the acquisition, processing and representation of light fields. We first compute a hierarchical representation from a set of sparse image samples using a combination of wavelet transform and scattered data interpolation. The light field oracle then progressively acquires image data and selectively refines this initial representation. By comparing the actual input image to the corresponding reconstruction from the wavelet pyramid, the oracle dynamically decides on whether the new sample is needed and, if necessary, inserts it into the representation. Our incremental update scheme exploits the spatial localization of wavelets and allows for highly efficient image decomposition. Likewise, image reconstruction for rendering is computed locally in the wavelet domain and does not require a global inverse transform. The wavelet hierarchy along with fast decomposition and rendering operators constitutes a powerful mathematical framework also amenable to compression.

关键词： Image reconstruction Layout Rendering (computer graphics) Wavelet transforms Interpolation Light scattering Image coding Cameras computer science Image decomposition

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Scalable self-orienting surfaces: a compact, texture-enhanced representation for interactive visualization of 3D vector fields

Scalable self-orienting surfaces: a compact, texture-enhance...

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pacific conference on computer graphics and applications

作者： G. Schussman Kwan-Liu Ma Center for Image Processing and Integrated Computing (CIPIC) Department of Computer Science University of California Davis CA USA

This paper presents a study of field line visualization techniques. To address both the computational and perceptual issues in visualizing large scale, complex, dense field line data commonly found in many scientific applications, a new texture-based field line representation which we call self-orienting surfaces is introduced This scalable representation facilitates hardware-accelerated rendering and incorporation of various perceptually-effective techniques, resulting in intuitive visualization and interpretation of the data under study. An electromagnetic data set obtained from accelerator modeling and a fluid flow data set from aerodynamics modeling are used for evaluation and demonstration of the techniques.

关键词： Surface texture Data visualization Fluid flow Streaming media Computational modeling Humans Concurrent computing Physics computing Visual perception Convergence

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A hybrid representation of environment models in image-based real time walkthrough

A hybrid representation of environment models in image-based...

引用

pacific conference on computer graphics and applications

作者： Yanci Zhang Xuehui Liu Enhua Wu Institute of Software Key Laboratory of Computer Science Chinese Academy and Sciences China University of Macao China

ISBN: (纸本)0769517846

In this paper, a hybrid representation of environment models using a combination of points and polygons is proposed. Through the model, a real time walkthrough of a complex environment can be achieved. We start from multiple depth reference images and classify the pixels of images into two categories, corresponding respectively to planar and non-planar surfaces in 3D space, then all the redundant points are removed by a comparison algorithm of sampling rate. For pixels corresponding to nonplanar surfaces, the point representation is maintained, and a local reconstruction and resampling process is employed to re-sample a set of points that distribute more uniformly on the surfaces. The re-sampled points are organized by an OBB-tree according to their space coordinates and a multiresolution structure is built to improve the rendering efficiency. For pixels corresponding to planar surfaces, the plane coefficients are reconstructed and all their appearances in the reference images are merged to texture maps. Under this hybrid representation, texture mapping and point-based rendering are employed to render the novel views, to take full advantage of the acceleration utility of graphics hardware. The algorithm demonstrates the combined advantages of approaches in traditional computer graphics and PBR/IBR, texture mapping for plane surfaces and point-based rendering for high detail surfaces and shapes.

关键词： Surface reconstruction Rendering (computer graphics) Surface texture Pixel Image reconstruction computer graphics Image sampling Acceleration Hardware Bioreactors

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