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Scam light field rendering 10

Scam light field rendering

引用

10th pacific conference on computer graphics and applications

作者： Yu, JY McMillan, L Gortler, S MIT Comp Sci Lab Cambridge MA 02139 USA

ISBN: (纸本)0769517846;0769517854

In this paper we present a new variant of the light field representation that supports improved image reconstruction by accommodating sparse correspondence information. This places our representation somewhere between a pure, two-plane parameterized, light field and a lumigraph representation, with its continuous geometric proxy. Our approach factors the rays of a light field into one of two separate classes. All rays consistent with a given correspondence are implicitly represented using a new auxiliary data structure, which we call a surface camera, or scam. The remaining rays of the light field are represented using a standard two-plane parameterized light field. We present an efficient rendering algorithm that combines ray samples from scams with those from the light field. The resulting image reconstructions are noticeably improved over that of a pure light field.

关键词： Application software computer graphics

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The light field oracle 10

The light field oracle

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10th pacific conference on computer graphics and applications

作者： Lütolf, R Schiele, B Gross, MH Swiss Fed Inst Technol Dept Comp Sci CH-8093 Zurich Switzerland

ISBN: (纸本)0769517846;0769517854

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

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An efficient brush model for physically-based 3D painting 10

An efficient brush model for physically-based 3D painting

引用

10th pacific conference on computer graphics and applications

作者： Chu, NSH Tai, CL Hong Kong Univ Sci & Technol Dept Comp Sci Kowloon Hong Kong Peoples R China

ISBN: (纸本)0769517846;0769517854

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

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Fast soft shadow visualization for deformable moving light sources using adaptively sampled light field shadow maps 10

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

引用

10th pacific conference on computer graphics and applications

作者： Jeng, EKY Xiang, ZG CUNY Grad Ctr Dept Comp Sci New York NY USA

ISBN: (纸本)0769517854

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

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A hybrid representation of environment models in image-based real time walkthrough 10

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

引用

10th pacific conference on computer graphics and applications

作者： Zhang, YC Liu, XH Wu, EH Chinese Acad Sci Inst Software Key Lab Comp Sci Beijing 100864 Peoples R China

ISBN: (纸本)0769517846;0769517854

In this paper, a hybrid representation of environment models by 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 the planar and non-planar surfaces in 3D space, then all the redundant points are removed by a comparison algorithm of sampling rate. For the pixels corresponding to the non-planar 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 points re-sampled are organized by OBB-tree according to their space coordinates and a multiresolution structure is built to improve the rendering efficiency. For the pixels corresponding to the 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 the approaches in traditional computer graphics and PBR/IBR, the texture mapping for plane surfaces and the point-based rendering for high detail surfaces and shapes.

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

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Combining 2D feature tracking and volume reconstruction for Online video-based human motion capture 10

Combining 2D feature tracking and volume reconstruction for ...

引用

10th pacific conference on computer graphics and applications

作者： Theobalt, C Magnor, M Schüler, P Seidel, HP Max Planck Inst Informat Saarbrucken Germany

ISBN: (纸本)0769517846;0769517854

The acquisition of human motion data is of major importance for creating interactive virtual environments, intelligent user interfaces, and realistic computer animations. Today's performance of off-the-shelf computer hardware enables marker-free non-intrusive optical tracking of the human body. In addition, recent research shows that it is possible to efficiently acquire and render volumetric scene representations in real-time. This paper describes a system to capture human motion at interactive frame rates without the use of markers or scene-intruding devices. Instead, 2D computer vision and 3D volumetric scene reconstruction algorithms are applied directly to the image data. A person is recorded by multiple synchronized cameras, and a multilayer hierarchical kinematic skeleton is fitted to each frame in a two-stage process. We present results with a prototype system running on two PCs.

关键词： Animation Hardware Humans Image reconstruction Layout Optical computing Rendering (computer graphics) Tracking User interfaces Virtual environment

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ISpace: Interactive volume data classification techniques using independent component analysis 10

ISpace: Interactive volume data classification techniques us...

引用

10th pacific conference on computer graphics and applications

作者： Takanashi, I Lum, EB Ma, KL Muraki, S Information Technology R and D Center Mitsubishi Electric Corporation Japan CIPIC Department of Computer Science University of California Davis United States National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Japan

ISBN: (纸本)0769517846;0769517854

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： histogram image processing independent component analysis medical imaging multivariate data analysis multimodality data scientific visualization segmentation volume rendering

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Interactive rendering of translucent objects 10

Interactive rendering of translucent objects

引用

10th pacific conference on computer graphics and applications

作者： Lensch, HPA Goesele, M Bekaert, P Kautz, J Magnor, MA Lang, J Seidel, HP Max Planck Inst Informat Saarbrucken Germany

ISBN: (纸本)0769517846;0769517854

This paper presents a rendering method for translucent objects, in which viewpoint and illumination can be modified at interactive rates. In a preprocessing step the impulse response to incoming light impinging at each surface point is computed and stored in two different ways: The local effect on close-by surface points is modeled as a per-texel filter kernel that is applied to a texture map representing the incident illumination. The global response (i.e. light shining through the object) is stored as vertex-to-vertex throughput factors for the triangle mesh of the object. During rendering, the illumination map for the object is computed according to the current lighting situation and then filtered by the precomputed kernels. The illumination map is also used to derive the incident illumination on the vertices which is distributed via the vertex-to-vertex throughput factors to the other vertices. The final image is obtained by combining the local and global response. We demonstrate the performance of our method for several models.

关键词： Biological materials computer graphics Electrical capacitance tomography Frequency Light scattering Lighting Optical reflection Optical scattering Particle scattering Throughput

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Approximation with active B-spline curves and surfaces 10

Approximation with active B-spline curves and surfaces

引用

10th pacific conference on computer graphics and applications

作者： Pottmann, H Leopoldseder, S Hofer, M Vienna Univ Technol Inst Geometry Vienna Austria

ISBN: (纸本)0769517846;0769517854

An active contour model for parametric curve and surface approximation is presented. The active curve or surface adapts to the model shape to be approximated in an optimization algorithm. The quasi-Newton optimization procedure in each iteration step minimizes a quadratic function which is built up with help of local quadratic approximants of the squared distance function of the model shape and an internal energy which has a smoothing and regularization effect. The approach completely avoids the parametrization problem. We also show how to use a similar strategy for the solution of variational problems for curves on surfaces. Examples are the geodesic path connecting two points on a surface and interpolating or approximating spline curves on surfaces. Finally we indicate how the latter topic leads to the variational design of smooth motions which interpolate or approximate given positions.

关键词： Active contours Application software Character generation computer vision Geometry Least squares approximation Parameter estimation Polynomials Smoothing methods Spline

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A method of human short hair modeling and real time animation 10

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

引用

10th pacific conference on computer graphics and applications

作者： Yang, GA Huang, ZY Volume Interact Singapore 068808 Singapore

ISBN: (纸本)0769517846;0769517854

This paper describes a method of human short hair modeling and real time animation. A method is proposed to model the short hair First, a hair style model is derived from a scalp model interactively. Then, the hair model is derived automatically from the hair style and scalp models. Texture mapping is applied to 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 the 3D morphing key shapes are derived. Then, the intermediate shapes are 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： computer animation real-time systems image texture image morphing stereo image processing human short hair modeling hair style model real time animation scalp model texture mapping visual effect physically-based hair model 3D morphing key shapes intermediate shapes frame rate

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