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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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Progressive compression of volumetric subdivision meshes

Progressive compression of volumetric subdivision meshes

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international symposium on 3d data processing visualization and transmission

作者： d. Laney V. Pascucci Lawrence Livemore National Laboratory USA

We present a progressive compression technique for volumetric subdivision meshes based on the slow growing refinement algorithm. The system is comprised of a wavelet transform followed by a progressive encoding of the resulting wavelet coefficients. We compare the efficiency of two wavelet transforms. The first transform is based on the smoothing rules used in the slow growing subdivision technique. The second transform is a generalization of lifted linear B-spline wavelets to the same multitier refinement structure. direct coupling with a hierarchical coder produces progressive bit streams. Rate distortion metrics are evaluated for both wavelet transforms. We tested the practical performance of the scheme on synthetic data as well as data from laser indirect-drive fusion simulations with multiple fields per vertex. Both wavelet transforms result in high quality trade off curves and produce qualitatively good coarse representations.

关键词： Wavelet transforms Finite element methods data visualization Spline Large-scale systems Laboratories Encoding Wavelet coefficients Smoothing methods Rate-distortion

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High-resolution cytometry network project: client/server system for 3d optical microscope data storage and analysis

High-resolution cytometry network project: client/server sys...

引用

international symposium on 3d data processing visualization and transmission

作者： P. Matula M. Kozubek P. Mejzlik Faculty of Informatics Laboratory of Optical Microscopy Masaryk University Brno CZ Czech Republic

If several laboratories work in the same field and need to cooperate, it is necessary to exchange and mutually compare their computer results. The quick way to solve this problem is to unite their file formats (if it is practicable) or to install new software systems, which are data or file format compatible. A much better solution is to use only one common system. This article describes the architecture of a new client-server system, which offers possibilities of effective cooperation for laboratories doing the research in the field of the spatial organization of human genome. However, the system design is determined mainly by optical microscopy principles and therefore the system can easily be modified for use in other applications or environments. The most pressing problem during the system design was how to share and process large 3d image data in client-server architecture.

关键词： Optical microscopy Network servers Optical fiber networks Memory data analysis Optical network units Laboratories Software systems Computer architecture Client-server systems

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Automatic extraction of planar projections from panoramic range images

Automatic extraction of planar projections from panoramic ra...

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international symposium on 3d data processing visualization and transmission

作者： A.d. Sappa Computer Vision Center Barcelona Spain

This work presents a segmentation technique to decompose automatically a panoramic range image into a set of planar projections. It consists of three stages. Firstly, two orthogonal surface orientation histograms are generated. Secondly, from these histograms the major surfaces orientations are extracted. Finally, a histogram of distances is computed for each one of these orientations; it would be used to define the position of the projection planes as well as the corresponding clipping planes. The original panoramic range image is divided into as many planar projections as main directions in the orientation histograms are extracted. This technique can be used with both indoor and outdoor scenes. Experimental result with a panoramic range image is presented.

关键词： Histograms Layout Engineering drawings Image segmentation data mining Computer vision Image sensors Space technology Automotive engineering Service robots

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Accurate 3d acquisition of freely moving objects

Accurate 3D acquisition of freely moving objects

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international symposium on 3d data processing visualization and transmission

作者： F. Blais M. Picard G. Godin National Research Council of Canada Institute for Information Technology Ottawa ONT Canada

This work presents a new acquisition method for 3d laser scanners that combines imaging, fast geometrical object tracking, and automatic pose estimation to register range profiles of freely moving objects. The method was developed to solve the constraint of rigidity between free-moving objects and a 3d scanner while preserving the accuracy of the range measurements. Rigidity constraint imposes that a 3d scanner or any external positioning devices must be perfectly stable relative to the object during scanning. This is often impossible for moving structures such as when using scaffolding, industrial conveyers, or robotic arms. The method starts by creating a rough, partial, and distorted estimate of the model of the object from an initial subset of sparse range data. Then, it recursively improves and refines the model by adding new range information. In parallel, real-time tracking of the object is performed to center the scan on the object. A high-resolution and accurate 3d model of a free-floating object, and real-time tracking of its position is obtained.

关键词： Optical sensors Stability Optical imaging Cameras Vibration measurement Optical devices Stimulated emission Inspection Space shuttles Councils

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Exploitation of 3d images for face authentication under pose and illumination variations

Exploitation of 3D images for face authentication under pose...

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international symposium on 3d data processing visualization and transmission

作者： F. Tsalakanidou S. Malassiotis M.G. Strintzis Informatics and Telematics Institute Centre for Research and Technology Hellas Thessaloniki Greece Information Processing Laboratory Electrical and Computer Engineering Department Aristotle University of Thessaloniki Thessaloniki Greece

An appearance-based face authentication system integrating 2d color or intensity images and 3d data is presented. The proposed system is based on a low-cost 3d and color sensor, capable of synchronous real-time acquisition of 3d images and associated color images. Novel algorithms are proposed that exploit depth information and prior knowledge of face geometry and symmetry to achieve robust face detection, localization and authentication under conditions of background clutter, occlusion, face pose alteration and harsh illumination. A method for the enrichment of face databases with synthetically generated views depicting variations in pose and illumination is proposed to cope with head rotations and illumination variations, avoiding a cumbersome enrolment process. The performance of the proposed authentication scheme is tested thoroughly on a face database of 1500 images, recorded with the 3d acquisition system. Experimental results demonstrate significant gains resulting from the combined use of depth and color or intensity information, in comparison to the use of 2d images alone.

关键词： Authentication Lighting Face detection Image databases Image sensors Sensor systems Real time systems Color Information geometry Robustness

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Encoding volumetric grids for streaming isosurface extraction

Encoding volumetric grids for streaming isosurface extractio...

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international symposium on 3d data processing visualization and transmission

作者： A. Mascarenhas M. Isenburg V. Pascucci J. Snoeyink Department of Computer Science University of North Carolina Chapel Hill USA Lawrence Livemore National Laboratory USA

Gridded volumetric data sets representing simulation or tomography output are commonly visualized by displaying a triangulated isosurface for a particular isovalue. When the grid is stored in a standard format, the entire volume must be loaded from disk, even though only a fraction of the grid cells may intersect the isosurface. We propose a compressed ondisk representation for regular volume grids that allows streaming, I/O-efficient, out-of-core isosurface extraction. Unlike previous methods, we provide a guaranteed bound on the ratio between the number of cells loaded and number of cells intersecting the isosurface that applies for any isovalue. As grid cells are decompressed, we immediately extract vertices and triangles of the isosurface. Our output is a coherent streaming mesh, which facilitates subsequent processing, including on-the-fly simplification and compression.

关键词： Encoding Isosurfaces data mining Computational modeling Pipeline processing Lifting equipment Tomography data visualization Sampling methods Solid modeling

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Heterogeneous deformation model for 3d shape and motion recovery from multi-viewpoint images

Heterogeneous deformation model for 3D shape and motion reco...

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international symposium on 3d data processing visualization and transmission

作者： S. Nobuhara T. Matsuyama Graduate School of Informatics Kyoto University Sakyo Kyoto Japan

This work presents a framework for dynamic 3d shape and motion reconstruction from multiviewpoint images using a deformable mesh model. By deforming a mesh at a frame to that at the next frame, we can obtain both 3d shape and motion of the object simultaneously. The deformation process of our mesh model is heterogeneous. Each vertex changes its deformation process according to its 1) photometric property (i.e., if it has prominent texture or not), and 2) physical property (i.e., if it is an element of rigid part of the object or not). This heterogeneous deformation model enables us to reconstruct the object which consists of different kinds of materials or parts with different motion models, e.g., rigidly acting body parts and deforming soft clothes or its skins, by a single and unified computational framework.

关键词： deformable models Shape Image reconstruction Photometry Humans Image motion analysis Computational modeling Informatics Electronic mail Skin

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Non-rigid range-scan alignment using thin-plate splines

Non-rigid range-scan alignment using thin-plate splines

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international symposium on 3d data processing visualization and transmission

作者： B.J. Brown S. Rusinkiewicz Princeton University USA

We present a nonrigid alignment algorithm for aligning high-resolution range data in the presence of low-frequency deformations, such as those caused by scanner calibration error. Traditional iterative closest points (ICP) algorithms, which rely on rigid-body alignment, fail in these cases because the error appears as a nonrigid warp in the data. Our algorithm combines the robustness and efficiency of ICP with the expressiveness of thin-plate splines to align high-resolution scanned data accurately, such as scans from the digital Michelangelo Project [M. Levoy et al. (2000)]. This application is distinguished from previous uses of the thin-plate spline by the fact that the resolution and size of warping are several orders of magnitude smaller than the extent of the mesh, thus requiring especially precise feature correspondence.

关键词： Iterative algorithms Calibration Iterative closest point algorithm Robustness Assembly Large-scale systems Hair Merging Iterative methods data processing

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Unsupervised motion classification by means of efficient feature selection and tracking

Unsupervised motion classification by means of efficient fea...

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international symposium on 3d data processing visualization and transmission

作者： A.d. Sappa N. Aifanti S. Malassiotis M.G. Strintzis Computer Vision Center Barcelona Spain Informatics and Telematics Institute Thessaloniki Greece

We present an efficient technique for human motion recognition; in particular, it is focused on labeling a movement as a walking or running displacement, which are the most frequent type of locomotion. The proposed technique consists of two stages and is based on the study of feature points' trajectories. The first stage detects peaks and valleys of points' trajectories, which are used on the second stage to discern whether the movement corresponds to a walking or a running displacement. Prior knowledge of human body kinematics structure together with the corresponding motion model are the basis for the motion recognition. Experimental results with different video sequences are presented.

关键词： Tracking Humans Biological system modeling Cameras Legged locomotion Video sequences Surveillance Kinematics Predictive models Computer vision

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Synthetic image of multiresolution sketch leads to new features

Synthetic image of multiresolution sketch leads to new featu...

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international symposium on 3d data processing visualization and transmission

作者： G. Khachaturov R. Moncayo-Munos Universidad Autónoma Metropolitana Mexico

An approach to construction of robust features is proposed and applied to an instance of the correspondence problem. The main idea is to construct a synthetic image by a multiresolution sketch (MS) of an image and involve it into extraction of the invariants. The MS is constructed by processing the image with a scalable detector of the semilocal 1d-elements. Then, a synthetic image is constructed with all elements of the MS. Local maxima of the first and second derivatives of the synthetic image along discrete curves of the MS lead to some singular elements represented by the points of a 4d manifold. It turns out that a representative subset of the singular elements is stable. To prove that, the pair-wise correspondence between subsets of singular elements of two shots of a film was established experimentally by a consistency technique, which, unlike past approaches, does not involve epipolar constraints.

关键词： Image resolution detectors Robustness Object detection Simultaneous localization and mapping Application software Computer vision Image processing Computational complexity Stability

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