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GPU rendering for autostereoscopic displays 4

GPU rendering for autostereoscopic displays

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4th international symposium on 3d data processing, visualization and transmission, 3dPVT 2008

作者： de Sorbier, François Nozick, Vincent Biri, Venceslas LABINFO-IGM UMR CNRS 8049 Université Paris-Est France Graduate School of Science and Technology Keio University Japan

In recent years, stereoscopic technology has advanced from stereoscopic to autostereoscopic displays. These latter family involves to display several views of a scene. In the case of real-time computer graphics images, the standard approach consists in rendering every view independently. This paper presents an alternative method to generate multiple views for autostereoscopic displays in a single rendering pass. Our algorithm is based on the fact that vertices properties remain the same from different viewpoints. Taking advantage of the latest generation of GPUs including geometry shaders, we propose a method that significantly speeds up the rendering process by duplicating and transforming incoming primitives for a defined set of views. Our method involves very few modifications to be used with a standard stereo device. © 2008 Georgia Institute of Technology.

关键词： Graphics processing unit

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A three-tier hierarchical model for capturing and rendering of 3d geometry and appearance from 2d images 4

A three-tier hierarchical model for capturing and rendering ...

引用

4th international symposium on 3d data processing, visualization and transmission, 3dPVT 2008

作者： Jagersand, Martin Birkbeck, Neil Cobzas, dana CS University of Alberta Canada

We propose a three-scale hierarchical representation of scenes and objects and show how this representation is suitable for both computer vision capture of models from images and efficient photo-realistic graphics rendering. The model consists of: (1) a conventional triangulated geometry on the macro-scale;(2) a displacement map, introducing pixel-wise depth with respect to each planar model facet (triangle) on the meso level;(3) a photo-realistic micro-structure represented by an appearance basis spanning viewpoint variation in texture space. We implement a capture and rendering system for this model. Conventional Shape-From-Silhouette or Structure-From-Motion is used to capture the coarse macro geometry, variational shape and reflectance estimation for the meso-level, and texture basis optimization for the micro level. For efficiency the meso and micro level routines are both HW accelerated. Photo-realistic capture of complex scenes is thus possible in a few minutes using budget cameras and PC's, and rendering is real-time. Experimental results and videos show models from regular images of humans and objects. © 2008 Georgia Institute of Technology.

关键词： Three dimensional computer graphics

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Filling holes in 3d meshes using image restoration algorithms 4

Filling holes in 3D meshes using image restoration algorithm...

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4th international symposium on 3d data processing, visualization and transmission, 3dPVT 2008

作者： Salamanca, Santiago Merchán, Pilar Adán, Antonio Pérez, Emiliano Cerrada, Carlos E. de Ingenierías Industriales Universidad de Extremadura Avda. de Elvas s/n Badajoz Spain E. S. de Ingeniería Informática Universidad de Castilla la Mancha P. de la Universidad 4 Ciudad Real Spain E. T. S. de Ingeniería Informática Universidad Nacional de Educación a Distancia C/ Juan del Rosal 16 Madrid Spain

This work describes a method for filling holes in a 3d mesh based on 2d image restoration algorithms. Since these algorithms need an image as input, the first stage of the method concerns a 3d to 2d transformation. By projecting the 3d surface onto a squared plane, a 2d image is generated in such a way that the depth information is stored in each grid. The image restoration algorithms are applied to it. Once the image has been repaired, the inverse transformation 2d to 3d is performed and the repaired 3d surface recovered. To test the method, artificial holes have been generated on a set of 3d surfaces. The goodness of the results has been measured from the comparison between the 3d original surfaces and the 3d repaired ones. An evaluation with commercial software has been carried out to show the validity of the method. The image restoration algorithms have been applied to 3d cultural heritage modeling with good results. Specifically, sculptures of the collection from the National Museum of Roman Art in Spain have been reconstructed. © 2008 Georgia Institute of Technology.

关键词： Three dimensional computer graphics

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Proxy-based compression of 2 1/2 d structure of dynamic events for tele-immersive systems 4

Proxy-based compression of 2 1/2 D structure of dynamic even...

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4th international symposium on 3d data processing, visualization and transmission, 3dPVT 2008

作者： Verlani, Pooja Narayanan, P.J. Centre for Visual Information Technology IIIT Hyderabad500032 India

Capture of dynamic events is an active research area today. Capturing the 2 1/2 d geometric structure and photometric appearance of dynamic scenes finds applications in 3d tele-conferencing systems, 3dTV etc. The captured "depth movies" contain aligned sequences of depth maps and textures and are often streamed to a distant location for immersive viewing. The depth maps are heavy and need efficient compression schemes. In this paper, we present a scheme to compress depth movies of human actors using a parametric proxy model for the underlying action. We use a generic articulated human model as the proxy and the various joint angles as its parameters for each time instant to represent a common prediction of the scene structure. The difference or residue between the captured depth and the depth of the proxy represents the scene to exploit spatial coherence. differences in residues across time are used to exploit temporal coherence. Intra-frame coded frames and difference-coded frames provide random access and high compression. We show results on several synthetic and real actions to demonstrate the compression ratio and resulting quality using a depth-based rendering of the decoded scene. © 2008 Georgia Institute of Technology.

关键词： Three dimensional computer graphics

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visualization Modeling of Mine Roadway based on Visual C#

Visualization Modeling of Mine Roadway based on Visual C#

引用

international symposium on Information Science and Engineering

作者： Shi, Fenghua Li, Xufeng Agr Univ Hebei Coll Rural & Urban Construct Baoding Peoples R China Ctr Gydrogeol & Environm Geol Baoding Peoples R China

ISBN: (纸本)9780769534947

As the most important spatial feature of coal mine, roadway takes an important part in construction of digital Mine (dM). If the roadway can be modeled in 3d visualization, people will get its 3d graphic and know the engineering change accurately and in time, not only these, it also helpful for showing the spatial relationships of excavation engineering and orebody, wall rock even the surface diggings. So, 3d visualization of roadway can improve the level of management and efficiency of mine and also good for mine design of safety and environmental. Take the roadway data of dongtan mine of Shandong as example, this paper mainly researches the data processing arithmetic, modeling method and visualization analyses of roadway based on Visual C# and directX 9.0C. In detail is building every regular roadway according to the key points of it to realize modeling the 3d roadway through the process of point -> line -> face -> single roadway -> multi-roadway. And then combined with the technology of texture mapping and light setting, the author solved some problems of joining the roadway at the turning points and doing some spatial analyses.

关键词： Virsual C# roadway 3d visualization modeling

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Integration of a time-of-flight camera into a mixed reality system for handling dynamic scenes, moving viewpoints and occlusions in real-time 4

Integration of a time-of-flight camera into a mixed reality ...

引用

4th international symposium on 3d data processing, visualization and transmission, 3dPVT 2008

作者： Bartczak, Bogumil Schiller, Ingo Beder, Christian Koch, Reinhard Computer Science Department Christian-Albrechts-University Kiel Hermann-Rodewald-Str. 3 Kiel24118 Germany

We present a novel approach to mixed reality applications. The key characteristics of the presented system are the use of a automatically generated static environment model and a time-of-flight camera device. The combination of both allows the correct handling of mutual occlusion between real and virtual content on the fly, which is not possible with the currently applied approaches. Typically expensive studio setups with complex camera tracking installations and multi-camera approaches in combination with chroma-keying facilities are used. Our system is rather inexpensive, compact, mobile, flexible and provides convenient calibration procedures. The use of a background model not only eliminates the need for chroma-keying in mixed reality production, it moreover supports planing and alignment of virtual content. Based on depth information the system is generating appropriate depth maps in realtime, making the approach suitable for 3d-TV productions. The presented paper discusses all key elements of mixedreality applications based on our approach. This includes camera pose tracking, correct real-time handling between interacting virtual and real content and the fast environment model building. © 2008 Georgia Institute of Technology.

关键词： Cameras

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ShareX3d, a scientific collaborative 3d viewer over HTTP 08

ShareX3D, a scientific collaborative 3D viewer over HTTP

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13th international Conference on 3d Web Technology

作者： Jourdain, Sebastien Forest, Julien Mouton, Christophe Nouailhas, Bernard Moniot, Gerard Kolb, Franck Chabridon, Sophie Simatic, Michel Abid, Zied Mallet, Laurent Artenum EDF R&D TELECOM & Management SudParis Oxalya

ISBN: (纸本)9781605582139

In scientific visualization data are becoming more and more complex and implies cooperative effort for their post-processing analysis as well as high performance processing, resources. Moreover experts are frequently geographically distributed and existing post-processing tools do not provide high performance capability with collaborative features. To solve this limitation, a prospective action has been recently initiated in the frame of the ANR SCOS project, with the development of a web based post-processing framework called V3d. SCOS/V3d is based oil two innovating concepts: the sharing Of the processing results via the transfer of a X3d data file corresponding to the final virtual reality scene and communications based on HTTP to by-pass standard proxies and firewalls limitations. To test this approach, a proof of concept prototype, called shareX3d, has been developed, especially focusing oil the events notification, with an implementation of the long polling technique. The architecture of ShareX3d and first tests are presented and discussed.

关键词： X3d Web3d collaboration web networking post-processing scientific visualization

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Using Markov Random Fields and algebraic geometry to extract 3d symmetry properties 4

Using Markov Random Fields and algebraic geometry to extract...

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4th international symposium on 3d data processing, visualization and transmission, 3dPVT 2008

作者： Sui, Yunfeng Willis, Andrew R. Dept. of Elec. and Comp. Engineering University of North Carolina at Charlotte CharlotteNC28223 United States

In this paper, we present a new technique for solving the difficult problem of estimating the axis of symmetry for axiallysymmetric surfaces. Accurate solutions to this problem are important in archaeology for systems that seek to reconstruct pottery vessels from measurements of their fragments. Our approach estimates quadratic surfaces at each measured surface point and uses a Markov Random Field superimposed on measured mesh surface to combine surface estimates into surface patches, each of which lies close to a single 3d quadratic surface. For each surface patch, we estimate a quadratic implicit polynomial whose coefficients directly provide an estimate of the unknown axis location and orientation. Using the bootstrap method, distributions for the axis parameters associated with each surface patch are computed. These competing estimates of the global axis are combined using Maximum Likelihood Estimation (MLE) to provide the final estimate. Our approach differs from past approaches by combining estimates derived from large surface regions that include many measurements instead of combining many local (often pointwise) estimates of the surface to determine the global estimate. Estimates from these large regions are more robust to noise and have sufficient data to provide statistical estimates of the uncertainty in the computed estimates. Major benefits of this technique include: (i) a pre-segmentation of the surface to identify noisy, i.e., a-symmetric, regions and (ii) a Bayesian method for merging estimates that makes the axis estimate robust to outliers and highly-variable estimates. © 2008 Georgia Institute of Technology.

关键词： Maximum likelihood estimation

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Managing uncertainty in visualization and analysis of medical data

Managing uncertainty in visualization and analysis of medica...

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5th IEEE international symposium on Biomedical Imaging

作者： Kniss, Joe Michael Univ New Mexico Albuquerque NM 87131 USA

ISBN: (纸本)9781424420025

The principal goal of visualization is to create a visual representation of complex information and large datasets in order to gain insight and understanding. Our current research focuses on methods for handling uncertainty stemming from data acquisition and algorithmic sources. Most visualization methods, especially those applied to 3d data, implicitly use some form of classification or segmentation to eliminate unimportant regions and illuminate those of interest. The process of classification is inherently uncertain;in many cases the source data contains error and noise, data transformations such as filtering can further introduce and magnify the uncertainty. More advanced classification methods rely on some sort of model or statistical method to determine what is and is not a feature of interest. While these classification methods can model uncertainty or fuzzy probabilistic memberships, they typically only provide discrete, maximum a-posteriori memberships. It is vital that visualization methods provide the user access to uncertainty in classification or image generation if the results of the visualization are to be trusted.

关键词： scientific visualization uncertainty sensitivity data processing computer graphics

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Accurate camera calibration and correction using rigidity and radial alignment constraints 4

Accurate camera calibration and correction using rigidity an...

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4th international symposium on 3d data processing, visualization and transmission, 3dPVT 2008

作者： Liu, Yonghuai Al-Obaidi, Ala Jakas, Anthony Li, Longzhuang Aberystwyth University CeredigionSY23 3DB United Kingdom Smart Light Devices Ltd. AberdeenAB24 2YN United Kingdom Texas A and M University Corpus ChristiTX78412 United States

In this paper, we develop a novel method for camera calibration and correction. The novel method first employs a rigidity constraint from the rigid rotation matrix and the radial alignment constraint from the pin-hole camera model to estimate both camera intrinsic and extrinsic parameters with a closed-form solution without considering the camera distortion. Then the well-known Levernburg-Marquardt (LM) algorithm is employed to optimize the parameters of interest in two steps: the first step optimizes the first order radial distortion coefficient and the z component of the camera position using a partial image formation model, and the second step optimizes all the parameters of interest using a complete image formation model: 4 intrinsic, 7 extrinsic and 4 distortion parameters. The LM algorithm is initialised either as the parameters estimated so far or as zero. The optimization is achieved through minimising the sum of the squared differences between the distorted projected 3d world control points and their given corresponding distorted image points. The distorted points are finally corrected using again the LM algorithm initialized by the distorted image points themselves, minimizing the squared difference between the distorted corrected point and the given distorted image point. The experimental results based on both synthetic data and real images show that the proposed algorithm produces promising camera calibration and correction results. © 2008 Georgia Institute of Technology.

关键词： Rigidity

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