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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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Triangle mesh-based surface modeling using adaptive smoothing and implicit surface texture integration

Triangle mesh-based surface modeling using adaptive smoothin...

引用

international symposium on 3d data processing visualization and transmission

作者： Y. Sun d.L. Page J.K. Paik A. Koschan M.A. Abidi Imaging Robotics and Intelligent Systems Laboratory University of Tennessee Knoxville TN USA

Presents a framework of surface modeling from multi-view range data. The input to the algorithms are triangle meshes, each of which is from a single view range scan. The triangle meshes generated from raw data are first processed by the proposed area decreasing flow for surface denoising. Although the proposed flow is mathematically equivalent to the mean curvature flow, it can avoid the difficulty in curvature estimation and provide an optimal flowing step size. We introduce an adaptive triangle mesh smoothing scheme based on crease edge strength of each vertex using tensor voting of the normal vector field inside a geodesic window. The smoothing result makes surface normal estimation more accurate which is then used in surface mesh integration. Based on Hilton's implicit surface-based method, surfaces from multiple views are integrated into a single 3d model. We incorporate color images to generate textured models. The algorithms are successfully applied to surface modeling from range data using two types of range scanners.

关键词： Surface texture Smoothing methods Surface reconstruction Laplace equations Color Image reconstruction Intelligent robots Low pass filters Level set Sun

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Using principal curvatures and darboux frame to recover 3d geometric primitives from range images

Using principal curvatures and Darboux frame to recover 3D g...

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international symposium on 3d data processing visualization and transmission

作者： E. Hameiri I. Shimshoni Department of Computer Science Technion-Israel Institute of Technology Haifa Israel Department of Industrial Engineering and Management Technion-Israel Institute of Technology Haifa Israel

We present a method for the recovery of partially occluded 3d geometric primitives from range images which might also include nonprimitive objects. The method uses a technique for estimating the principal curvatures and darboux frame from range images which we developed. After estimating the principal curvatures and the darboux frames from the entire scene, a search for the known patterns of these features in geometric primitives is performed. If a specific pattern is identified then the presence of the corresponding primitive is confirmed using these local features. The features are also used to recover the primitive's characteristics. The suggested application is very efficient since it combines the segmentation, classification and fitting processes, which are part of any recovery process, in a single process, which advances monotonously through the recovery procedure. The combined process does not use any least-squares fittings and therefore is very robust to inaccuracies in the local feature extraction process and to errors in segmentation. It was tested on series of real complex cluttered scenes, yielding accurate and robust recoveries of primitives.

关键词： Layout Image segmentation Surface fitting Robustness Feature extraction Testing Iterative algorithms Computer science Industrial engineering Technology management

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Image-based photo hulls

Image-based photo hulls

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international symposium on 3d data processing visualization and transmission

作者： G. Slabaugh R. Schafer M. Hans Center for Signal and Image Processing Georgia Institute of Technology Atlanta GA USA Client & Media Systems Laboratory Hewlett Packard Laboratories Palo Alto CA USA

We present an efficient image-based rendering algorithm that computes photo hulls of a scene photographed from multiple viewpoints. Our algorithm, called image-based photo hulls (IBPH), like the image-based visual hulls (IBVH) algorithm from Matusik et. al. (2000) on which it is based, takes advantage of epipolar geometry to efficiently reconstruct the geometry and visibility of a scene. Our IBPH algorithm differs from IBVH in that it utilizes the color information of the images to identify the scene geometry. These additional color constraints often result in a more accurately reconstructed geometry, which projects to better synthesized virtual views of the scene. We demonstrate our algorithm running in a real-time 3d telepresence application using video data acquired from four viewpoints.

关键词： Layout Image reconstruction Rendering (computer graphics) Surface reconstruction Signal processing Image processing Laboratories Information geometry Motion pictures Educational institutions

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Hole formation process in laser deep drilling with short and ultrashort pulses

Hole formation process in laser deep drilling with short and...

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2nd international symposium on Laser Precision Microfabrication

作者： Kononenko, TV Klimentov, SM Garnov, SV Konov, VI Breitling, d Föhl, C Ruf, A Radtke, J dausinger, F Russian Acad Sci Inst Gen Phys Ctr Nat Sci Moscow 117942 Russia

ISBN: (纸本)0819441376

The drilling process in different materials (diamond, steel, ceramics and PMMA) was studied for a large range of pulse lengths from about 100 fs to 10 ns using different approaches. In transparent materials the penetration process was visualized with high-speed video analysis and microscopy. The drilling rate as well as the relation between processing energy density and ablation threshold were determined in situ. The penetration of the laser beam inside the channel and the influence of laser-ignited plasma were investigated by transmission measurements. Mechanisms of energy coupling and heat losses were examined by applying simple analytical calculations. Proposals for the basic understanding of the drilling process are presented.

关键词： laser drilling rate ultrashort pulses channel model analytical calculation visualization

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Virtual GIS applied to urban facility management

Virtual GIS applied to urban facility management

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IEEE international symposium on Geoscience and Remote Sensing (IGARSS)

作者： Kyong-Ho Kim Seung-Keol Choe Jong-Hyun Park Young-Kyu Yang Spatial Information Technology Center Electronics and Telecommunications Research Institute Daejeon South Korea

ISBN: (纸本)078037536X

Urban facility management is one of the applications to which the virtual GIS is well applied. For virtual GIS to be utilized to manage urban facilities, some functionalities should be provided. One of them is how to manage the huge size of 3d geographic data as compact as possible at the same time providing realistic modeling and visualization. The other one is spatial analysis on urban facilities especially on multistorey buildings. In this paper, the synthetic modeling approach is proposed to model urban facilities realistically from the compact size of GIS data. Geographic features positioned in each storey of a building are also modeled and managed hence they are identified and queried for spatial analysis.

关键词： Geographic Information Systems Cities and towns data visualization Query processing Packaging Computational geometry Information technology Technology management Management information systems Computer graphics

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Real-time reconstruction of wavelet encoded meshes for view-dependent transmission and visualization

Real-time reconstruction of wavelet encoded meshes for view-...

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IEEE international Conference on Image processing

作者： P. Gioia O. Aubault C. Bouville France Telecom R & D France

Wavelet methods for geometry encoding is a recently emerged superset of multiresolution analysis which has proven to be very efficient in term of compression and adaptive transmission of 3d content. The decorrelating power and space/scale localization of wavelets enable efficient compression of arbitrary meshes as well as progressive and local reconstruction. Recent techniques based on zerotree compression have shown to be among the best lossy mesh compression methods, while remaining compatible with selective transmission of geometric data at various level of detail. While some progressive reconstruction schemes have been proposed in the past, we show in this paper that this representation, recently proposed in the MPEG4 standard, can be efficiently used to perform real-time, view-dependent reconstruction of large meshes. The proposed system combines algorithms for local updates, cache management and server/client dialog. The local details management is an improvement of progressive reconstructions built on top of hierarchical structures. It enables fast, homogeneous accommodation and suppression of wavelet coefficients at any level of subdivision, with time complexity independent of the size of the reconstructed mesh. The cache structure wisely exploits the hierarchical character of the received data, in order to avoid redundant information transmission. The whole system enables the client to have total control on the quality of navigation according to its storage and processing capabilities, whatever the size of the mesh.

关键词： visualization Wavelet analysis Geometry Encoding Multiresolution analysis decorrelation Propagation losses MPEG 4 Standard Wavelet coefficients Size control

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2002 IEEE international symposium on Circuits and Systems. Proceedings (Cat. No.02CH37353)

2002 IEEE International Symposium on Circuits and Systems. P...

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IEEE international symposium on Circuits and Systems (ISCAS)

The following topics are dealt with: dSP for communications; adaptive filtering; multimedia over IP and wireless networks; VLSI arithmetic architectures; system level issues; digital-to-analog conversion; RF mixers; analog testability; interconnect modeling and optimization; blind dSP; multiple antenna systems; OFdM; cellular neural networks; stability and control; wireless communication architectures; transconductance and low-voltage amplifiers; multimedia communication and transmission; bifurcation and chaos; FIR filters; analog-to-digital conversion; RF filters; filter theory and linear networks; communication theory; cellular neural networks; nonlinear circuit analysis; MEM devices; amplifiers, references and multipliers; hardware implementation for multimedia; image compression; multidimensional signal processing; filter banks; signal processing for communications; channel coding; pipelined AdC; circuit theory and applications; nanoelectronic integrated circuits; analog synthesis and optimization; multimedia understanding and segmentation; neural network hardware architecture; nonlinear systems modeling; sensors and processing circuits; audio and speech processing; active filters; numerical and combinatorial optimization; 3d graphics; image processing; smart sensors; cryptography; system-on-chip methodologies; oscillators and phase locking; operational amplifiers; multimedia watermarking; power estimation; motion estimation; chaotic circuits; wireline communication architectures; MEMS; signal processing algorithms; oversampled data conversion; video signal processing; IIR digital filters; logarithmic and residue arithmetic; high speed VLSI circuits; self-correcting AdC; integrated inductors; fast-settling amplifiers; floor planning and placement; communication networks; adaptive signal processing; Nyquist data conversion; voltage controlled oscillators; phase locked loops; reference circuits; frequency response masking techniques; wireless architectures

关键词： Networks Circuit analysis Circuit synthesis Very-large-scale integration Neural networks Multimedia systems Signal processing Image processing Microelectromechanical devices Encoding Modulation Circuits Communication systems Power systems digital filters digital arithmetic

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Automatic fiber tractography from dTI and its validation

Automatic fiber tractography from DTI and its validation

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IEEE international symposium on Biomedical Imaging

作者： B.C. Vemuri Y. Chen M. Rao Z. Wang T. McGraw T. Mareci S.J. Blackband P. Reier Department of CISE University of Florida Gainesville FL USA Department of Mathematics University of Florida Gainesville FL USA Department of Biochemistry University of Florida Gainesville FL USA Department of Neuroscience University of Florida Gainesville FL USA

ISBN: (纸本)078037584X

To understand evolving pathology in the central nervous system (CNS) and develop effective treatments, it is essential to correlate the nerve fiber connectivity with the visualization of function. Such information is fundamental in CNS processes since anatomical connections determine where information is passed and processed diffusion tensor imaging (dTI) can provide the fundamental information required for viewing structural connectivity. However robust and accurate acquisition and processing algorithms are needed to accurately map the nerve connectivity. In this paper we present a novel, algorithm for automatic fiber tract mapping in the CNS specifically, a rat spinal cord as well as validate the mapped fibers using ex-vivo fluoro images of the excised rat. The novelty of our work lies in the fiber tract mapping as well as the validation experiment. The automatic fiber tract mapping problem will be solved in two phases, namely a data smoothing phase and a fiber tract mapping phase. In the former smoothing is achieved via a new weighted TV-norm minimization which strives to smooth while retaining all relevant detail. For the fiber tract mapping, a smooth 3d vector field indicating the dominant anisotropic direction at each spatial location is computed from the smoothed data. Fiber tracts are then determined as the smooth integral curves of this vector field in a variational framework Examples are presented for dTI data sets from a normal and injured rat spinal cords respectively.

关键词： diffusion tensor imaging Smoothing methods Tensile stress visualization Organisms Nonlinear equations Mathematics Biochemistry Neuroscience Robustness

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detection and imaging of small buried 3d non-metallic objects with multistatic phase-based GPR signatures

Detection and imaging of small buried 3D non-metallic object...

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IEEE international symposium on Geoscience and Remote Sensing (IGARSS)

作者： B. Sai L.P. Ligthart International Research Centre for Telecommunications-transmission and Radar (IRCTR) Department of Electrical Engineering Faculty of Information Technology and Systems Delft University of Technnology Delft Netherlands

In this paper the bistatic and monostatic phase-based ground-penetrating radar (GPR) technique for ingenious detection of poor-contrast scattering objects hidden just beneath the air-ground interface is discussed. This technique neither requires a priori knowledge about the background medium nor needs any pure background measurement. It was developed to deal with one of the worst-case scenarios in terms of landmine detection. The method was tested with the data measured from the L-band and S-band stepped-frequency continuous-wave GPR over the compound soil where small non-metallic mines are shallowly buried. The results demonstrate that it is feasible to detect small buried poor-contrast objects by using coherent phase processing and imaging.

关键词： Buried object detection Phase detection Ground penetrating radar Radar detection Soil measurements Object detection Radar scattering Landmine detection Testing L-band

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Responding to the challenge of producing and distributing MOdIS data at the NASA/GES dISC via the Remote Sensing Information Partners (RSIP) program

Responding to the challenge of producing and distributing MO...

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IEEE international symposium on Geoscience and Remote Sensing (IGARSS)

作者： J.J. Qu G. Serafino B. Teng d. Ouzounov N. Pollack L. Chiu GES Data Information Service Center (DISC) NASA Goddard Space Flight Center Greenbelt MD USA

With the Moderate Resolution Imaging Spectroradiometer (MOdIS) provisional version (V003) data releasing, there is a new challenge of producing and distributing MOdIS data to end users. However, for many prospective users of the data, the large file sizes and complex format of MOdIS have posed difficulties, including insufficient bandwidth for downloading the data, insufficient storage on the users' platforms, and incompatibility of the format with visualization packages, including most geographic information system (GIS) packages. In respond to these issues, the NASA Goddard Earth Science (GES) data and Information Service Center (dISC) has engaged in facilitating on new applications and distributions for Earth science remote sensing data through the Remote Sensing Information Partners (RSIP) program. This paper discusses (1) designing the infrastructure for MOdIS data production and distribution via the RSIP program; (2) constructing a system for customized RSIP MOdIS data product development and distribution; (3) developing techniques and tools for MOdIS processing; and (4) future plans to enhance the accessibility of MOdIS applications through the RSIP program.

关键词： MOdIS NASA Remote sensing Packaging Geographic Information Systems Geoscience Bandwidth data visualization Production systems Product development

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