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检索条件"任意字段=International Symposium on 3D Data Processing Visualization and Transmission"

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PdE-based multi-view depth estimation

PDE-based multi-view depth estimation

引用

international symposium on 3d data processing visualization and transmission

作者： C. Strecha L. Van Gool Katholieke Universiteit Leuven Leuven Belgium ESAT-PSI Zurich Switzerland

The paper describes a method for depth extraction from multiple, calibrated images. Emphasis lies on the integration of multiple views during the matching process. This process is guided by the relative confidence that the system has in the data coming from the different views. This weighing is fine-grained in that it is determined for every pixel at every iteration. Reliable information spreads fast at the expense of less reliable data, both in terms of spatial communications and in terms of exchange between views. The resulting system can handle large disparities, depth discontinuities and occlusions. Moreover provisions are made to deal with intensity changes between corresponding pixels. Experimental results corroborate the viability of the approach and the improved results that can be expected from the system's ability to deal with variable intensities.

关键词： Optical distortion Image motion analysis data mining Stereo vision Nonlinear optics Cameras Calibration Optical sensors Computer vision Layout

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Wavelet coding of structured geometry data considering rate-distortion properties

Wavelet coding of structured geometry data considering rate-...

引用

international symposium on 3d data processing visualization and transmission

作者： T. Kajita H. Kaneko K. Fukuda A. Kawanaka Faculty of Science and Technology Sophia University Japan

In this paper we describe a wavelet coding method for geometry data structured on a triangular lattice. Efficient representations of a 3d object shape and its texture data have attracted wide attention for transmission of computer graphics data and for interactive design in manufacturing. Polygonal mesh data, which consists of connectivity information, geometry data and texture data, are often used for representing 3d objects in many applications. We propose a compression method for polygonal mesh data by structuring its connectivity data and geometry data on a triangular lattice. The structured geometry data is compressed by applying a 2d wavelet coding method. We obtain the wavelet coefficients by applying the shape-adaptive wavelet transform to the structured geometry data. By defining the parent-children dependencies as the set of wavelet coefficients from different bands that represent the same spatial region in a triangular lattice, the wavelet coefficients in the spatial tree are pruned optimally based on the rate-distortion properties of the geometry data. Comparison of the proposed wavelet coding with other coding schemes for polygonal mesh data shows that the proposed wavelet coding achieves better coding efficiency than other schemes adopted in the MPEG-4 standard.

关键词： Rate-distortion Lattices Wavelet coefficients Shape Computer graphics Computer aided manufacturing Information geometry Application software Wavelet transforms MPEG 4 Standard

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A hierarchy of cameras for 3d photography

A hierarchy of cameras for 3D photography

引用

international symposium on 3d data processing visualization and transmission

作者： J. Neumann C. Fermuller Y. Aloimonos Center for Automation Research University of Maryland College Park MD USA

We investigate the relationship between camera design and 3d photography, by examining the influence of camera design on the estimation of the motion and structure of a scene from video data. To compute the 3d structure of a scene accurately from a moving vision sensor we need to be able to estimate the motion of the sensor from the recorded image information, a problem that has been well-studied By relating the differential structure of the time varying plenoptic function to different known and new camera designs, we can establish a hierarchy of cameras based upon the stability and complexity of the computations necessary to estimate structure and motion. At the low end of this hierarchy is the standard planar pinhole camera for which the structure from motion problem is non-linear and ill-posed. At the high end is a camera, which we call the full field of view polydioptric camera, for which the problem is linear and stable. In between are multiple view cameras with a large field of view which we have built, as well as omni-directional sensors. We develop design suggestions for a polydioptric camera especially suited for 3d photography, and we propose a linear algorithm utilizing this camera design to recover the structure of the scene.

关键词： Cameras Photography Layout Motion estimation Image sensors Algorithm design and analysis design automation Educational institutions Computer vision Stability

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Improvement of metric accuracy of digital 3d models through digital photogrammetry. A case study: donatello's Maddalena

Improvement of metric accuracy of digital 3D models through ...

引用

international symposium on 3d data processing visualization and transmission

作者： J.-A. Beraldin G. Guidi S. Ciofi C. Atzeni IIT National Research Council Canada Ottawa ON Canada DET Universita degli Studi Firenze Florence Italy

In spite of an undoubted richness of information produced by 3d optical technologies, in some cases, the method for generating a digital model from single 3d acquisitions involves the propagation of errors. These errors limit the overall metric accuracy attainable with such procedure. This happens when small 3d images are assembled together in order to model a large object. The authors present a procedure by which the metric reliability of the 3d model, obtained through iterative alignments of single range maps, can be guaranteed to an acceptable level. For this purpose, nonimpeding optical targets were specifically designed for placement around the object. These are measured using a close range digital photogrammetry technique and by the 3d range camera system. From these measurements, transformation matrices have been calculated Each matrix allows for the roto-translation (pose) of the 3d images from the local coordinate system of the range camera to an accurate global coordinate system determined by the digital photogrammetric procedure.

关键词： Computer aided software engineering Charge-coupled image sensors Computer errors digital cameras Optical sensors Cultural differences Surface texture Charge coupled devices Councils Optical propagation

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Compression of isosurfaces for structured volumes with context modelling

Compression of isosurfaces for structured volumes with conte...

引用

international symposium on 3d data processing visualization and transmission

作者： d. Saupe J.-P. Kuska Fak.fur Physik Universität Koblenz-Landau Germany Universität Leipzig Germany

In many applications surfaces with a large number of primitives occur. Geometry compression reduces storage space and transmission time for such models. A special case is given by polygonal isosurfaces generated from gridded volume data. However most current state-of-the-art geometry compression systems do not capitalize on the structure that is characteristic of such isosurfaces, namely that the surfaces are defined by a set of vertices on edges of the grid. In a previous paper we proposed a compression method for isosurfaces that exploits this feature. In this paper we use the same coding approach, however, including context models for the encoding of the symbol streams. We report improved compression ratios for complex isosurfaces from a CT scan of a human head Our coder outperformed state-of-the-art general purpose geometry compression methods. We also report results obtained by two predictive coding methods based on least squares function fitting and a surface relaxation algorithm.

关键词： Isosurfaces Context modeling Geometry Surface fitting Solid modeling Mesh generation Encoding Computed tomography Humans Predictive coding

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The ORIGAMI project: advanced tools and techniques for high-end mixing and interaction between real and virtual content

The ORIGAMI project: advanced tools and techniques for high-...

引用

international symposium on 3d data processing visualization and transmission

作者： G. Bazzoni E. Bianchi O. Grau A. Knox R. Koch F. Lavagetto A. Parkinson F. Pedersini A. Sarti G. Thomas S. Tubaro Phoenix Tool Italy Chinatown SRL Italy BBC Research and Development Group UK Frame Store UK Multimedia Information Processing Christian-Albrechts University Germany Dipartimento Informatica Sistemistica e Telematica Italy Dipartimento Elettronica e Informazione Politecnico di Milano Politecnico di Milano Italy

ORIGAMI is an EU-funded IST project with the goal to develop advanced tools and new production techniques for high-quality mixing of real and virtual content for film and TV productions. In particular, the project proposes new techniques for 3d camera calibration and tracking and for 3d scene reconstruction and plenoptic modelling. Such solutions will support a variety of different object classes and application scenarios, including single-camera modelling of static environments, and multi-camera modelling of dynamic studio scenes. The developed methods will be integrated into a new software framework, which is being developed within the project. ORIGAMI also proposes novel techniques that enable real and virtual actors to interact with each other and with the real and virtual elements of the extended set.

关键词： Production Costs Flexible manufacturing systems TV Cameras Layout Motion pictures Research and development Information processing Calibration

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A volumetric approach for interactive 3d modeling

A volumetric approach for interactive 3D modeling

引用

international symposium on 3d data processing visualization and transmission

作者： d. Tubic P. Hebert d. Laurendeau Computer Vision and Systems Laboratory Laval University Sainte Foy QUE Canada

Range image registration and surface reconstruction have been traditionally considered as two independent problems where the latter relies on the results of the former. This paper presents a new approach to surface recovery from range images where these two processes are integrated and performed in a common volumetric representation. The volumetric representation contains both implicitly represented reconstructed surface as the signed distance field and corresponding matching information in the form of the gradient of the distance field. This allows both simultaneous and incremental registration where matching complexity is linear with respect to the number of images. This improvement leads to incremental modeling from range image acquisition to surface reconstruction. It is shown that the approach is tolerant to initial registration errors as well as to measurement errors while keeping the details of the initial range images. The paper describes the formalism of the approach. Experimental results demonstrate performance advantages, tolerance to aforementioned types of errors and, as an application, filtering using redundant range data without loss of sharp details on the reconstructed surface.

关键词： Image reconstruction Surface reconstruction Filtering Computer vision Laboratories Image registration Measurement errors Performance loss Solid modeling Noise reduction

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Real-time speech-driven 3d face animation

Real-time speech-driven 3D face animation

引用

international symposium on 3d data processing visualization and transmission

作者： Pengyu Hong Zhen Wen T.S. Huang Heung-Yeung Shum Coordinated Science Laboratory University of Illinois Urbana-Champaign USA Beckman Institute University of Illinois Urbana-Champaign USA Microsoft Research Laboratory-Beijing Beijing China

In this paper, we present an approach for real-time speech-driven 3d face animation using neural networks. We first analyze a 3d facial movement sequence of a talking subject and learn a quantitative representation of the facial deformations, called the 3d motion units (MUs). A 3d facial deformation can be approximated by a linear combination of the MUs weighted by the MU parameters (MUPs) - the visual features of the facial deformation. The facial movement sequence synchronizes with a audio track. The audio track is digitized and the audio features of each frame are calculated. A real-time audio-to-MUP mapping is constructed by training a set of neural networks using the calculated audio-visual features. The audio-visual features are divided into several groups based on the audio features. One neural network is trained per group to map the audio features to the corresponding MUPs. Given a new audio feature vector, we first classify it into one of the groups and select the corresponding neural network to map the audio feature vector to MUPs, which are used for face animation. The quantitative evaluation shows the effectiveness of the proposed approach.

关键词： Facial animation Neural networks Speech Shape Linear predictive coding Vector quantization Context modeling Cepstral analysis delay effects Visual databases

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Fast landmark-based registration via deterministic and efficient processing, some preliminary results

Fast landmark-based registration via deterministic and effic...

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international symposium on 3d data processing visualization and transmission

作者： F. dePiero Cal Poly State University San Louis Obispo CA USA

Preliminary results of a method for range view registration are presented. The method incorporates the LeRP algorithm, which is a deterministic means to approximate subgraph isomorphisms. Graphs are formed that describe salient scene features. Graph matching then provides the scene-to-scene correspondence necessary for registration. A graphical representation is invariant with respect to sensor standoff. Test results from real and synthetic images indicate that a reasonable tradeoff between speed and accuracy is achievable. A mean rotational error of /spl sim/1 degree was found for a variety of test cases. Mean compute times were found to be better than 2 Hz, with image sizes varying from 128/spl times/200 to 240/spl times/320. These tests were run on a 900 MHz PC The greatest challenge to this approach is the stable localization and invariant characterization of image features via fast, deterministic techniques.

关键词： Layout Testing Image segmentation Image edge detection Stability Computer vision Cameras Tracking Iterative methods Closed-form solution

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Advanced three-dimensional television system technologies

Advanced three-dimensional television system technologies

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international symposium on 3d data processing visualization and transmission

作者： A. Redert M.O. de Beeck C. Fehn W. Ijsselsteijn M. Pollefeys L. Van Gool E. Ofek I. Sexton P. Surman Philips Research Laboratories Prof Holstlaan 4 Eindhoven The Netherlands Heinrich-Hertz Institute Einsteinufer 37 Berlin Germany Eindhoven University of Technology Den Dolech 2 The Netherlands Katholieke Universiteit Leuven Kasteelpark Arenberg 10 Belgium Belgium 3DV Systems Industrial ParkBuilding 7 20692 Y okneam Yokneam Israel De Montfort University The Gateway Leicester LEI 9BH United Kingdom Leicester UK

We describe the goals of the ATTEST project, which started in March 2002 as part of the Information Society Technologies (IST) programme, sponsored by the European Commission. In the 2-year project, several industrial and academic partners cooperate towards a flexible, 2d-compatible and commercially feasible 3d-TV system-for broadcast environments. An entire 3d-video chain will be developed. We discuss the goals for content creation, coding, transmission, display and the central role that human 3d perception research will play in optimizing the entire chain. The goals include the development of a new 3d camera, algorithms to convert existing 2d-video material into 3d, a 2d-compatible coding and transmission scheme for 3d video using MPEG-2/4/7, and two new autostereoscopic displays. With the combination of industrial and academic partners and the technological progress obtained from earlier 3d projects, we expect to achieve the ATTEST goal of developing the first commercially feasible European 3d-TV broadcast system.

关键词： Three dimensional TV Cameras Three dimensional displays Multimedia communication Humans Consumer electronics Optical materials digital video broadcasting Laboratories TV broadcasting

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