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检索条件"任意字段=10th Pacific Conference on Computer Graphics and Applications"

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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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the light field oracle 10

The light field oracle

引用

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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Approximation with active B-spline curves and surfaces 10

Approximation with active B-spline curves and surfaces

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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...

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

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

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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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Interactive rendering of translucent objects 10

Interactive rendering of translucent objects

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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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Lighting interpolation by shadow morphing using intrinsic Lumigraphs 10

Lighting interpolation by shadow morphing using intrinsic Lu...

引用

10th pacific conference on computer graphics and applications

作者： Matsushita, Y Kang, SB Lin, S Shum, HY Tong, X Univ Tokyo Inst Ind Sci Meguro Ku Tokyo 1538505 Japan

ISBN: (纸本)0769517846;0769517854

Densely-sampled image representations such as the light field or Lumigraph have been effective in enabling photorealistic image synthesis. Unfortunately, lighting interpolation with such representations has not been shown to be possible without the use of accurate 3D geometry and surface reflectance properties. In this paper we propose an approach to image-based lighting interpolation that is based on estimates of geometry and shading from relatively few images. We decompose captured light fields at different lighting conditions into intrinsic images (reflectance and illumination images), and estimate view-dependent scene geometries using multi-view stereo. We call the resulting representation an Intrinsic Lumigraph. In the same way that the Lumigraph uses geometry to permit more accurate view interpolation, the Intrinsic Lumigraph uses both geometry and intrinsic images to allow high-quality interpolation at different views and lighting conditions. Joint use of geometry and intrinsic images is effective in the computation of shadow masks for shadow prediction at new lighting conditions. We illustrate our approach with images of real scenes.

关键词： Asia Cameras Geometry Image representation Interpolation Layout Lighting Rendering (computer graphics) Shape Solid modeling

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A physics-based framework for subdivision surface design with automatic rules control 10

A physics-based framework for subdivision surface design wit...

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10th pacific conference on computer graphics and applications

作者： Xie, H Qin, H SUNY Stony Brook Dept Comp Sci Stony Brook NY 11794 USA

ISBN: (纸本)0769517846;0769517854

the recent non-uniform subdivision approach extends traditional uniform subdivision schemes with variable rules, offering additional shape parameters (such as knot spacings) for feature control. Despite its flexibility, shape modification based on non-uniform subdivision usually requires designers to interactively adjust a large number of degrees of freedom (DOFs) to achieve the desired shapes, which can often be laborious. this paper extends the principle of variational subdivision and integrates the non-unifonn subdivision schemes with powerful physics-based shape sculpting techniques, providing a universal method for arbitrary subdivision schemes with adjustable rules. the subdivision control points and knot spacings evolve in response to the shape deformation resulting from the numerical integration of Lagrangian dynamics equation or the optimization of shape energy functional. thus, our system allows users to manipulate the desired shape in a direct and intuitive fashion. In addition, we propose a novel and efficient discrete functional evaluation method for polygonal meshes or point cloud of arbitrary topology based on implicit functions, in which no parameterization is needed. Finally, we develop a simple prototype sculpting system demonstrating many advantages of our novel physics-based, non-uniform subdivision modeling system.

关键词： computer graphics CAD physics-based modeling subdivision

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Estimation of multiple directional light sources for synthesis of mixed reality images 10

Estimation of multiple directional light sources for synthes...

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10th pacific conference on computer graphics and applications

作者： Wang, Y Samaras, D SUNY Stony Brook Dept Comp Sci Stony Brook NY 11794 USA

ISBN: (纸本)0769517854

We present a new method for the detection and estimation of multiple directional illuminants, using a single image of any object with known geometry and Lambertian reflectance. We use the resulting highly accurate estimates to modify virtually the illumination and geometry of a real scene and produce correctly illuminated Mixed Reality images. Our method obviates the need to modify the imaged scene by inserting calibration objects of any particular geometry, relying instead on partial knowledge of the geometry of the scene. thus, the recovered multiple illuminants can be used both for image-based rendering and for shape reconstruction. Our method combines information both from the shading of the object and from shadows cast on the scene by the object. Initially we use a method based on shadows and a method based on shading independently. the shadow based method utilizes brightness variation inside the shadows cast by the object, whereas the shading based method utilizes brightness variation on the directly illuminated portions of the object. We demonstrate how the two sources of information complement each other in a number of occasions. We then describe an approach that integrates the two methods, with results superior to those obtained if the two methods are used separately. the resulting illumination information can be used (i) to render synthetic objects in a real photograph with correct illumination effects, and (ii) to virtually re-light the scene.

关键词： Brightness Calibration Geometry Layout Light sources Lighting Object detection Reflectivity Rendering (computer graphics) Virtual reality

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Hierarchical representation of time-varying volume data with ⁴√2 subdivision and quadrilinear B-spline wavelets 10

Hierarchical representation of time-varying volume data with...

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10th pacific conference on computer graphics and applications

作者： Linsen, L Pascucci, V Duchaineau, MA Hamann, B Joy, KI Univ Calif Davis Dept Comp Sci Ctr Image Proc & Integrated Computing Davis CA 95616 USA

ISBN: (纸本)0769517846;0769517854

Multiresolution methods for representing data at multiple levels of detail are widely used for large-scale two- and three-dimensional data sets. We present a four-dimensional multiresolution approach for time-varying volume data. this approach supports a hierarchy with spatial and temporal scalability. the hierarchical data organization is based on (4)root2 subdivision. the (n)root2-subdivision scheme only doubles the overall number of grid points in each subdivision step. this fact leads to fine granularity and high adaptivity, which is especially desirable in the spatial dimensions. For high-quality data approximation on each level of detail, we use quadrilinear B-spline wavelets. We present a linear B-spline wavelet lifting scheme based on (n)root2 subdivision to obtain narrow masks for the update rules. Narrow masks provide a basis for out-of-core data exploration techniques and view-dependent visualization of sequences of time steps.

关键词： computer science Data visualization Image processing Image resolution Laboratories Large scale integration Large-scale systems Scientific computing Spatial resolution Spline

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