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View-dependent streaming of progressive meshes

View-dependent streaming of progressive meshes

引用

International Conference on Shape Modeling and Applications

作者： Junho Kim Seungyong Lee L. Kobbelt Department of Computer Science and Engineering Postech South Korea Computer Graphics Group RWTH Aachen Germany

Multiresolution geometry streaming has been well studied in recent years. The client can progressively visualize a triangle mesh from the coarsest resolution to the finest one while a server successively transmits detail information. However, the streaming order of the detail data usually depends only on the geometric importance, since basically a mesh simplification process is performed backwards in the streaming. Consequently, the resolution of the model changes globally during streaming even if the client does not want to download detail information for the invisible parts from a given view point. In this paper, we introduce a novel framework for view-dependent streaming of multiresolution meshes. The transmission order of the detail data can be adjusted dynamically according to the visual importance with respect to the client's current view point. By adapting the truly selective refinement scheme for progressive meshes, our framework provides efficient view-dependent streaming that minimizes memory cost and network communication overhead. Furthermore, we reduce the per-client session data on the server side by using a special data structure for encoding which vertices have already been transmitted to each client. Experimental results indicate that our framework is efficient enough for a broadcast scenario where one server streams geometry data to multiple clients with different view points.

关键词： Network servers Image reconstruction Streaming media computer science computer graphics Computational geometry Data visualization Costs Data structures Broadcasting

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Shape from contours and multiple stereo a hierarchical, mesh-based approach

Shape from contours and multiple stereo a hierarchical, mesh...

引用

Canadian Conference on computer and Robot Vision, CRV

作者： H. Kiick W. Heidrich C. Vogelgsang Department of Computer Science University of British Columbia Canada Computer Graphics Group Universitat Erlangen-Nuremberg Germany

Start of the above-titled section of the conference proceedings record.

关键词： Shape Data mining Cost function Level set Hardware computer graphics computer science Spatial coherence Deformable models Acceleration

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Framework for real time cloud rendering

Framework for real time cloud rendering

引用

International Conference on computer graphics, Imaging and Visualization, CGIV

作者： M.A. Rana M.S. Sunar M.N.N. Hayat S. Kari A. Bade Department of Computer Graphics and Multimedia Faculty of Computer Science and Information System University Technology of Malaysia Skudai Johor Malaysia

computer graphics (CG) is a key technology for producing visual contents. Currently computer generated imagery techniques are being developed and applied, particularly in the field of virtual reality applications, film production, training and flight simulators, to provide total composition of realistic computer graphic images. Clouds are an integral feature of the sky without them synthetic outdoor scenes seems unrealistic. Modeling and animating clouds is a difficult task. Most systems are difficult to use, as they require adjustment of numerous, complex parameters, and are noninteractive. This paper presents an intuitive, interactive system to artistically model, animate, and render visually convincing clouds using modern graphics hardware. A high-level interface models clouds through the visual use of cubes. Clouds are rendered as textured billboards by making use of hardware accelerated API - OpenGL. The resulting interactive design and rendering system produces perceptually convincing cloud models that can be used in any interactive system.

关键词： Clouds Rendering (computer graphics) computer graphics Animation Interactive systems Hardware Character generation Image generation Virtual reality Application software

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Multi-path algorithm for triangle strips

Multi-path algorithm for triangle strips

引用

computer graphics International

作者： P. Vanecek I. Kolingerova Centre of Computer Graphics and Data Visualization Department of Computer Science and Engineering University of West Bohemia Pilsen Czech Republic

Triangle surface models belong to the most popular type of geometric objects description in computer graphics. Therefore, the problem of fast visualization of this type of data is often solved. One of popular approaches is stripification, i.e., a conversion of triangle surface into strips of triangles. This enables to reduce the rendering time by reduction data size and by avoiding of redundant lighting and transformations computations. In this paper we present a new stripification algorithm for static fully triangulated meshes. Our new algorithm is based on the dual graph of triangulation. The experimental results show that our stripification produces much lower number of triangle strips than other stripification algorithms (except one)

关键词： Strips computer graphics Data visualization Rendering (computer graphics) Costs computer science Data engineering Solid modeling Application software computer aided manufacturing

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Robust registration of virtual objects for industrial applications

Robust registration of virtual objects for industrial applic...

引用

IEEE International Conference on Industrial Technology (ICIT)

作者： B. Fergani M.C. Batouche B. Boufama Computer Science Department Faculty of Engineering LIRE laboratory Vision and Computer Graphics Group Mentouri University Constantine Algeria School of Computer Science University of Windsor Windsor Canada

Vision-based registration techniques for augmented reality systems have been the subject of intensive research recently due to their potential to accurately align virtual objects with the real world. The registration process can be done in three steps: 1) Positioning: put the virtual object at a desired position. 2) Rendering: get the 2D image of the positioned 3D virtual object 3) The rendering of the virtual object will then be merged with the image of real environment to compose an augmented image. Rendering the virtual object is not trivial work, since it not only depends on its 3D location and orientation, but also depends on the camera's location and orientation. When the camera undergoes a transformation, the parameters for rendering will also be accordingly changed. Therefore, for a realtime augmented reality system, the camera pose must be dynamically tracked at frame rate. In order to simulate the real camera, we have to know its intrinsic and extrinsic parameters. The intrinsic parameters describe camera's optical, geometric and digital characteristics. The extrinsic parameters describe position and orientation of the camera. Both intrinsic and extrinsic parameters can be estimated through a camera calibration process (for example Zonglei and Boufama's method). However, calibrating the camera in real-time, for applications similar to industry, is not necessary (for example Kutulakos & vallino's method). In this paper we present our framework based on Zonglei & Boufama's approach and we describe Kutulakos & vallino's approach (we haven't yet results).

关键词： Robustness Augmented reality Rendering (computer graphics) computer science Virtual reality Laboratories computer graphics Digital cameras Geometrical optics Parameter estimation

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A method for reconstructing label images from a few projections, as motivated by electron microscopy

A method for reconstructing label images from a few projecti...

引用

IEEE International Symposium on Biomedical Imaging

作者： H.K. Liao G.T. Herman Discrete Imaging and Graphics Group Department of Computer Science Post-Graduate Center NY USA

Our aim is to produce a tessellation of space into small voxels and, based on only a few tomographic projections of an object, assign to each voxel a label that indicates one of the components of interest constituting the object. Traditional methods are not reliable in applications, such as electron microscopy in which (due to the damage by radiation) only a few projections are available. We postulate a low level prior knowledge regarding the underlying distribution of label images, and then directly estimate the label image based on the prior and the projections. We use a relatively efficient approximation to a global search for the estimation.

关键词： Image reconstruction Electron microscopy Computed tomography Image segmentation Proteins Ice Molecular biophysics RNA Character generation computer graphics

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Robust watermarking of point-sampled geometry

Robust watermarking of point-sampled geometry

引用

International Conference on Shape Modeling and Applications

作者： D. Cotting T. Weyrich M. Pauly M. Gross Computer Graphics Laboratory Swiss Federal Institute of Technology Zurich Switzerland Computer Science Department University of Stanford Stanford CA USA

We present a new scheme for digital watermarking of point-sampled geometry based on spectral analysis. By extending existing algorithms designed for polygonal data to unstructured point clouds, our method is particularly suited for scanned models, where the watermark can be directly embedded in the raw data obtained from the 3D acquisition device. To handle large data sets efficiently, we apply a fast hierarchical clustering algorithm that partitions the model into a set of patches. Each patch is mapped into the space of eigenfunctions of an approximate Laplacian operator to obtain a decomposition of the patch surface into discrete frequency bands. The watermark is then embedded into the low frequency components to minimize visual artifacts in the model geometry. During extraction, the target model is resampled at optimal resolution using an MLS projection. After extracting a watermark from this model, the corresponding bit stream is analyzed using statistical methods based on correlation. We have applied our method to a number of point-sampled models of different geometric and topological complexity. These experiments show that our watermarking scheme is robust against numerous attacks, including low-pass filtering, resampling, affine transformations, cropping, additive random noise, and combinations of the above.

关键词： Robustness Watermarking Geometry Clustering algorithms Partitioning algorithms Frequency Solid modeling Additive noise Spectral analysis Algorithm design and analysis

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Smooth trimmed NURBS surface connection with tension control

Smooth trimmed NURBS surface connection with tension control

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Geometric Modeling and Processing

作者： Pifu Zhang Fuhua Cheng Graphics & Geometric Modeling Lab Department of Computer Science University of Kentucky Lexington KY USA

An automatic smooth surface connection method that has the capability of tension control is presented. Given two trimmed NURBS surfaces, the new method constructs a smooth connection surface to connect the trimming regions of the trimmed surfaces at the trimming curves. The connection satisfies pseudo-G/sup 1/ or pseudo-C/sup 1/ smoothness requirement. The construction process consists of four major steps: connection curves construction and alignment, initial blends construction, setting up continuity constraints, and internal and external boundary smoothing. The advantages of the new method include: (1) providing the users with more flexibility in adjusting the shape of the connection surface; (2) the representation of the connection surface is compatible with most of the current data-exchange standards; (3) including the classical blending as a special case but with more flexibility on the setting of the rail curves; and (4) smoother shape of the resulting connection surface through an energy optimization process. Test cases that cover typical CAD applications are included.

关键词： Spline Surface topography Surface reconstruction Solid modeling

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Human body segmentation and matching using biomechanics 3D models

Human body segmentation and matching using biomechanics 3D m...

引用

International Conference on Information Visualisation (IV)

作者： J.M. Buades F.J. Perales M. Gonzalez A. Aguilo P. Martinez Department of Computer Science (UIB) Computer Graphics and Vision Group Spain Nursing and Physical Therapy Department Universitat de les Illes Balears Spain

In many applications the study of human movement using a computer vision and graphics techniques is very useful. One of these applications is the three-dimensional reconstruction of the structure of the human body and its movement using sequences of images and biomechanical graphics models. We present a whole and general system to study the human motion without markers but, in this case, we apply it to high-level competition disabled swimmers. This kind of study needs accuracy on the analysis and reconstruction of the person's body, therefore the virtual human (avatar) must have similar anthropometrical characteristics than the person who is doing the movement. We define a process to adjust the humanoid to the morphology of the person. It could be very laborious and subjective if done manually or by selection of points, but in this article we present a global human motion system capturing, modeling and matching a semiautomatic process between the real person and the modeled humanoid or synthetic avatar. Semiautomatic means that the computers propose the best matching from previous frames and the user can accept it or not. Once this process is carried out we are ready to analyze and represent the movements under study. It must be defined a specific set of parameter for every kind of sport. The study is adapted to specific sport activities, in our case swimming activities with an additional complexity: water occlusion and distortion. In these cases the adjustment process must be assisted by the computer using rules and models to help the expert user in correspondence tasks.

关键词： Humans Biomechanics Biological system modeling Application software computer graphics Image reconstruction Avatars Image segmentation computer vision Morphology

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GPU-assisted z-field simplification

GPU-assisted z-field simplification

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International Symposium on 3D Data Processing Visualization and Transmission

作者： A. Bogomjakov C. Gotsman Center of Graphics and Geometric Computing Computer Science Department Technion-Israel Institute of Technology Haifa Israel

Height fields and depth maps which we collectively refer to as z-fields, usually carry a lot of redundant information and are often used in real-time applications. This is the reason why efficient methods for their simplification are necessary. On the other hand, the computation power and programmability of commodity graphics hardware has significantly grown. We present an adaptation of an existing real-time z-field simplification method for execution in graphics hardware. The main parts of the algorithm are implemented as fragment programs which run on the GPU. The resulting polygonal models are identical to the ones obtained by the original method. The main benefit is that the computation load is imposed on the GPU, freeing-up the CPU for other tasks. Additionally, the new method exhibits a performance improvement when compared to a pure CPU implementation.

关键词： Hardware Rendering (computer graphics) Concurrent computing computer graphics computer science Application software computer aided instruction Throughput Physics computing Pipelines

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