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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...

引用

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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3D Video Recorder 10

3D Video Recorder

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10th pacific conference on computer graphics and applications

作者： Würmlin, S Lamboray, E Staadt, OG Gross, MH Swiss Fed Inst Technol Dept Comp Sci Zurich Switzerland

ISBN: (纸本)0769517846;0769517854

We present the 3D Video Recorder a system capable of recording, processing, and playing three-dimensional video from multiple points of view. We first record 2D video streams from several synchronized digital video cameras and store pre-processed images to disk. An off-line processing stage converts these images into a time-varying three-dimensional hierarchical point-based data structure and stores this 3D video to disk. We show how we can trade-off 3D video quality with processing performance and devise efficient compression and coding schemes for our novel 3D video representation. A typical sequence is encoded at less than 7 megabit per second at a frame rate of 8.5 frames per second. The 3D video player decodes and renders 3D videos from hard-disk in real-time, providing interaction features known from common video cassette recorders, like variable-speed forward and reverse, and slow motion. 3D video playback can be enhanced with novel 3D video effects such as freeze-and-rotate and arbitrary scaling. The player builds upon point-based rendering techniques and is thus capable of rendering high-quality images in real-time. Finally, we demonstrate the 3D Video Recorder on multiple real-life video sequences.

关键词： Data structures Decoding Digital cameras Disk recording Image coding Image converters Rendering (computer graphics) Streaming media Video compression Video recording

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A model based technique for realistic oriental painting 10

A model based technique for realistic oriental painting

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10th pacific conference on computer graphics and applications, PG 2002

作者： Yu, Young Jung Lee, Young Bok Cho, Hwan Gue Lee, Do Hoon Pusan University of Foreign Studies Korea Republic of Pusan National University Korea Republic of Miryang National University Korea Republic of

ISBN: (纸本)0769517846

Realistic representation of various effects which appear in the real world paintings can be used for several applications like animation or education. To generate oriental paintings, numerous studies have focused on model-based approaches. In this paper, a new model-based approach for oriental paintings is described. To represent the diffusion effects, we propose local equilibrium model (LEM) which is a method to calculate the movement of water and ink effectively. In addition, we propose a paper model with fiber mesh structure and three layers structure on each cell. With this layer model, overlapped strokes can be well represented. A brush model proposed supports several brush effects like shading. © 2002 IEEE.

关键词： computer graphics

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Adaptive solid texturing for Web3D applications 10

Adaptive solid texturing for Web3D applications

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10th pacific conference on computer graphics and applications, PG 2002

作者： Chen, Bing-Yu Nishita, Tomoyuki University of Tokyo Japan

ISBN: (纸本)0769517846

Solid texturing is a well-known computer graphics technology, which is problematic because it consumes too much time if every pixel is calculated on the fly or has a very high memory requirement if all of the pixels are stored at the beginning. Although some methods have been proposed, almost all of them need the support of specific hardware accelerators. Hence, these methods could not be applied to all kinds of machine, especially low-cost ones available over the Internet. Therefore, we present a new method for procedural solid texturing. Our approach could almost render an object with solid texturing in real-time using only a software solution. Furthermore, to demonstrate that our approach is widely applicable we choose pure Java for its implementation, since it does not receive any benefit from hardware and could be executed on the Internet directly. © 2002 IEEE.

关键词： Application programs

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An architectural extension to the media core process or for HDTV applications

An architectural extension to the media core process or for ...

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Asia-pacific conference on Circuits and Systems

作者： Yoshioka, K Oka, H Nishida, H Matsuura, R Kiyohara, T Matsushita Elect Ind Co Ltd Kadoma Osaka 571 Japan

ISBN: (纸本)0780376900

In this paper, we introduce an architectural extension to the Media Core Processor (MCP), which targets a system solution for consumer multimedia products. This extension implements HDTV video decoding (1080i, 720p, 480p. and 480i), video resizing, 2-D graphics rendering, and conversion between various video formats for data broadcasting. For pixel-level operations in HDTV applications, a SIMD-style processor has been introduced. However, image resizing causes a difference in data structure between source and result dynamically. Therefore, an advanced inter-PE (Processing Element) communication mechanism is necessary as an extension to the common SIMD-style architecture. This processor achieves the flexibility of pixel-level operation and the efficiency of high bandwidth. Adopting this new MCP architecture enabled us to improve image quality to fulfill the requirements for consumer products.

关键词： Bandwidth Data structures Decoding graphics HDTV Image converters Image quality Multimedia communication Rendering (computer graphics) Videos

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On the effects of haptic display in brush and ink simulation for Chinese painting and calligraphy 10

On the effects of haptic display in brush and ink simulation...

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10th pacific conference on computer graphics and applications, PG 2002

作者： Yeh, Jeng-Sheng Lien, Ting-Yu Ouhyoung, Ming Department of Computer Science and Information Engineering National Taiwan University Taiwan

ISBN: (纸本)0769517846

We develop an interactive haptic system, which can be a further aid for digital Chinese painting. When an artist is holding our force feedback device, one feels like holding a real painting brush with all the contact and bending forces, since the viscosity, friction, and the bending force of a brush touching the paper are simulated. First we derive a physical dynamics model as bending springs for bristles to construct a 3D brush. Then we simulate the ink-water transfer system for ink spreading and color blending. Our system is a real-time system and users can interact with it holding a digital brush supported by either a Phantom force feedback device or a "WACOM pressure sensing pen" on a tablet. A pilot experiment was conducted, and the results show that brush writing with haptic feedback is better than that of the same visual display but without haptic feedback. © 2002 IEEE.

关键词： Viscosity

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Computing distances between surfaces using line geometry 10

Computing distances between surfaces using line geometry

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10th pacific conference on computer graphics and applications, PG 2002

作者： Sohn, Kyung-Ah Jüttler, Bert Kim, Myung-Soo Wang, Wenping School of Computer Science and Engineering Seoul National University Korea Republic of Institute of Analysis Dept. of Applied Geometry Johannes Kepler University of Linz Austria Dept. of Computer Science and Information Systems University of Hong Kong Hong Kong Hong Kong

ISBN: (纸本)0769517846

We present an algorithm for computing the distance between two free-form surfaces. Using line geometry, the distance computation is reformulated as a simple instance of a surface-surface intersection problem, which leads to low-dimensional root finding in a system of equations. This approach produces an efficient algorithm for computing the distance between two ellipsoids, where the problem is reduced to finding a specific solution in a system of two equations in two variables. Similar algorithms can be designed for computing the distance between an ellipsoid and a simple surface (such as cylinder cone, or torus). In an experimental implementation (on a 500 MHz Windows PC), the distance between two ellipsoids was computed in less than 0.3 msec on average;and the distance between an ellipsoid and a simple convex surface was computed in less than 0.15 msec on average. © 2002 IEEE.

关键词： Chromium

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