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Compression of isosurfaces for structured volumes with context modelling 1

Compression of isosurfaces for structured volumes with conte...

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1st international symposium on 3d data processing visualization and transmission

作者： Saupe, d Kuska, JP Univ Konstanz D-7750 Constance Germany

ISBN: (纸本)0769515215;0769515223

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： Computerized tomography

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High-resolution cytometry network project:: Towards remote and distributed acquisition, processing and visualisation of 3d image data in human genome research 1

High-resolution cytometry network project:: Towards remote a...

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1st international symposium on 3d data processing visualization and transmission

作者： Kozubek, M Matula, P Matula, P Mejzlík, P Masaryk Univ Fac Informat Brno Czech Republic

ISBN: (纸本)0769515215;0769515223

The absence of common image storage, processing and visualisation approaches is a very serious problem of the collaboration between optical microscopy laboratories. The results produced by individual groups are therefore often not comparable. Even a simple visualisation of image data acquired in a different laboratory is often time-consuming because of the non-existence of a common 3d image file format. In this paper we present a solution to these problems for the specific task of acquisition, storage, processing and visualisation of 3d image data of fluorescently stained genetic material used in the research of the spatial organisation of human genome. We have developed a special software system based on the client/server architecture that enables the collaboration of laboratories active in this field. Each laboratory acquires the 3d image data using its own microscopes but stores them together with a detailed description of the samples on a central high-performance multi-processor UNIX server that acts as a file server, database server and image analysis server that accepts orders from individual clients. The requested parts of image data as well as image analysis results are sent back to the clients via Internet. In order to provide high computational power the server was equipped with the fastest processors available and the whole network architecture has been optimised for speed.

关键词： Laboratories

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Wavelet coding of structured geometry data considering rate-distortion properties 1

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

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1st international symposium on 3d data processing visualization and transmission

作者： Kajita, T Kaneko, H Fukuda, K Kawanaka, A Sophia Univ Fac Sci & Technol Tokyo Japan

ISBN: (纸本)0769515215;0769515223

In this paper, we describe about wavelet coding method for geometry data structured on a triangular lattice. Efficient representations of 3-d 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 3-d object 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 2-d wavelet coding method. Me obtain the wavelet coefficients by applying 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 triangular lattice, and the wavelet coefficients in spatial tree are pruned optimally based on the rate-distortion properties of the geometry data. Comparison of proposed wavelet coding with other coding scheme for polygonal mesh data shows that the proposed wavelet coding achieves better coding efficiency than other scheme adopted in the MPEG-4 standard.

关键词： geometry compression 2-d structuralization wavelet coding VRML

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Colon centreline calculation for CT colonography using optimised 3d opological thinning 1

Colon centreline calculation for CT colonography using optim...

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1st international symposium on 3d data processing visualization and transmission, 3dPVT 2002

作者： Sadleir, R.J.T. Whelan, P.F. Vision Systems Laboratory School of Electronic Engineering Dublin City University Dublin 9 Ireland

ISBN: (纸本)0769515215

CT colonography is an emerging technique for colorectal cancer screening. This technique facilitates noninvasive imaging of the colon interior by generating virtual reality models of the colon lumen. Manual navigation through these models is a slow and tedious process. It is possible to automate navigation by calculating the centreline of the colon lumen. There are numerous well documented approaches for centreline calculation. Many of these techniques have been developed as alternatives to 3d topological thinning which has been discounted by others due to its computationally intensive nature. This paper describes a fully automated, optimised version of 3d topological thinning that has been specifically developed for calculating the centreline of the human colon. © 2002 IEEE.

关键词： Virtual reality

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From 3d shape capture of animated models 1

From 3D shape capture of animated models

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1st international symposium on 3d data processing visualization and transmission, 3dPVT 2002

作者： Hilton, A. Starck, J. Collins, G. Centre for Vision Speech and Signal Processing University of Surrey GuildfordGU27XH United Kingdom

ISBN: (纸本)0769515215

This paper presents a framework for construction of animated models from captured surface shape of real objects. Algorithms are introduced to transform the captured surface shape into a layered model. The layered model comprises an articulation structure, generic control model and a displacement map to represent the high-resolution surface detail. Novel methods are presented for automatic control model generation, shape constrained fitting and displacement mapping of the captured data. Results are demonstrated for surface shape captured using both multiple view images and active surface measurement. The framework enables rapid transformation of captured data into a structured representation suitable for realistic animation. © 2002 IEEE.

关键词： Surface measurement

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Probabilistic 3d data usion for adaptive resolution surface generation 1

Probabilistic 3D data usion for adaptive resolution surface ...

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1st international symposium on 3d data processing visualization and transmission, 3dPVT 2002

作者： Johnson, A.E. Manduchi, R. Jet Propulsion Laboratory California Institute of Technology United States Computer Engineering Department University of California Santa CruzCA United States

ISBN: (纸本)0769515215

In this paper we present an algorithm for adaptive resolution integration of 3d data collected from multiple distributed sensors. The input to the algorithm is a set of 3d surface points and associated sensor models. Using a probabilistic rule, a surface probability function is generated that represents the probability that a particular volume of space contains the surface. The surface probability function is represented using an octree data structure;regions of space with samples of large covariance are stored at a coarser level than regions of space containing samples with smaller covariance. The algorithm outputs an adaptive resolution surface generated by connecting points that lie on the ridge of surface probability with triangles scaled to match the local discretization of space given by the octree. To demonstrate the performance of our algorithm, we present results from 3d data generated by scanning lidar and structure from motion. © 2002 IEEE.

关键词： Probability

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Spherical diffussion for 3d surface smoothing 1

Spherical diffussion for 3D surface smoothing

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1st international symposium on 3d data processing visualization and transmission, 3dPVT 2002

作者： Bülow, T. Computer Science Division University of California Berkeley 485 Soda Hall # 1776 BerkeleyCA94720-1776 United States

ISBN: (纸本)0769515215

We present an approach to surface smoothing based on linear diffusion. In contrast to mesh-based approaches we represent surfaces as scalar functions defined on the sphere which restricts the analysis to star-shaped objects. We derive the Green's function of the linear diffusion process on the sphere and identify it with the spherical Gauss function. This allows us to introduce a linear scale-space for data on the sphere. The approach is computationally efficient since does not require iterative smoothing. Several examples are presented demonstrating the evolution of surfaces and their parabolic lines under the spherical diffusion process. © 2002 IEEE.

关键词： Spheres

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A volumetric approach for interactive 3d modeling 1

A volumetric approach for interactive 3D modeling

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1st international symposium on 3d data processing visualization and transmission

作者： Tubic, d Hébert, P Laurendeau, S Univ Laval Comp Vis & Syst Lab Ste Foy PQ G1K 7P4 Canada

ISBN: (纸本)0769515215;0769515223

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 cot-responding 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： Surface reconstruction

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Advanced three-dimensional television system technologies 1

Advanced three-dimensional television system technologies

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1st international symposium on 3d data processing visualization and transmission, 3dPVT 2002

作者： Redert, A. de Beeck, M.O. Fehn, C. IJsselsteijn, W. Pollefeys, M. Van Gool, L. Ofek, E. Sexton, I. Surman, P. Philips Research Laboratories Prof. Holstlaan 4 Eindhoven5656 AA Netherlands Heinrich-Hertz Institute Einsteinufer 37 BerlinD-10587 Germany Eindhoven University of Technology Den Dolech 2 Eindhoven5600 MB Netherlands Katholieke Universiteit Leuven Kasteelpark Arenberg 10 Heverlee3001 Belgium 3DV Systems Industrial Park Building 7 Yokneam20692 Israel De Montfort University The Gateway LeicesterLE1 9BH United Kingdom

ISBN: (纸本)0769515215

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. © 2002 IEEE.

关键词： Cameras

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Efficient algorithm fo the computation of 3d Fourier descriptors

Efficient algorithm fo the computation of 3D Fourier descrip...

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international symposium on 3d data processing visualization and transmission

作者： J. Sijbers d. Van dyck Vision Laboratory University of Antwerp Antwerp Belgium

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