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

共 1618 条记录，以下是1511-1520 订阅

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A 3d laser micro-sensor integrating control and data processing in an FPGA-based calculator

A 3D laser micro-sensor integrating control and data process...

引用

international Conference on 3d Imaging, Modeling, processing, visualization and transmission (3dIMPVT)

作者： N. Arana-Arejolaleiba M. Briot C. Ganibal A. Nketsa R. Prajoux Laboratoire d’Analysc ct d’Architecture des Systèmes LAAS CNRS Toulouse France Mondragon University Arrasate Spain

ISBN: (纸本)0769509843

Within a project whose objective is to develop a small-size 3d sensor combining a video camera with a 3d laser-based "camera", this paper describes the current status of the laser camera. The prototype of the laser camera is operational and is able to produce 3d "images" with good definition at high speed. Because of size constraints, some of the control electronics are implemented in an FPGA. The video camera that will be included in the system also needs integrated data processing. Consequently, the paper also describes an ongoing research about how to optimize the implementation in an FPGA of an algorithm class which is relevant both for control electronics and video data processing.

关键词： Optical control Process control data processing Cameras Laser beams Layout Field programmable gate arrays Silicon Prototypes Size control

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3d capture for computer graphics

3D capture for computer graphics

引用

international Conference on 3d Imaging, Modeling, processing, visualization and transmission (3dIMPVT)

作者： H.E. Rushmeier IBM Thomas J. Watson Research Center Yorktown Heights NY USA

We examine the use of 3d scanned objects in computer graphics applications. We consider the requirements for the types and resolution of data required. We also identify some outstanding research issues in this area.

ISBN: (纸本)0769509843

关键词： Computer graphics Application software Virtual reality Shape Layout Image generation Rendering (computer graphics) Production systems Computational modeling Computer applications

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Shape recovery and analysis of large screw threads

Shape recovery and analysis of large screw threads

引用

international Conference on 3d Imaging, Modeling, processing, visualization and transmission (3dIMPVT)

作者： C. Robertson R.B. Fisher Machine Vision Unit Institute for Perception Action and Behaviour Division of Informatics University of Edinburgh Edinburgh UK

In this work we have addressed the question of whether it is possible to extract parametric models of screw-threads from 3d range data. Results, example times for analysis and comparisons with known ground truths are ... 详细信息

ISBN: (纸本)0769509843

关键词： Shape Fasteners Yarn data mining Manufacturing Sampling methods Laser noise Gaussian noise Machine vision Informatics

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Stroboscopic stereo rangefinder

Stroboscopic stereo rangefinder

引用

international Conference on 3d Imaging, Modeling, processing, visualization and transmission (3dIMPVT)

作者： J.-C. Nebel F.J. Rodriguez-Miguel W.P. Cockshott 3D-MATIC Research Laboratory University of Glasgow Glasgow UK

ISBN: (纸本)0769509843

The Michelangelo dynamic 3d scanner uses stereo rangefinding along with strobe illumination to capture 3d information at 25 frames per second. The configuration allows rapid motion within the capture volume to be frozen into a series of virtual sculptures. Textured strobe illumination is used for range data and plain strobe illumination for colour data. We present examples of data captured with the system along with measurements of the tolerances attained in the measurements.

关键词： Shape measurement Cameras Humans Laboratories Lighting Motion pictures Laser modes Laser beams Biological system modeling Motion analysis

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processing range data for reverse engineering and virtual reality

Processing range data for reverse engineering and virtual re...

引用

international Conference on 3d Imaging, Modeling, processing, visualization and transmission (3dIMPVT)

作者： S. Karbacher X. Laboureux N. Schon G. Hausler University of Erlangen Germany

ISBN: (纸本)0769509843

Optical 3-d sensors are used as tools for reverse engineering and virtual reality to digitize the surface of real three-dimensional objects. We discuss an almost fully automatic method to generate a surface description based on a mesh of curved or flat triangles. The method includes mesh reduction, smoothing, and reconstruction of missing data. The generated meshes feature minimum curvature variations and are therefore especially suited for visualization and rapid prototyping.

关键词： Reverse engineering Virtual reality Surface reconstruction Optical sensors Optical distortion Smoothing methods Image reconstruction Mesh generation Merging Image sensors

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Reliable 3d surface acquisition, registration and validation using statistical error models

Reliable 3D surface acquisition, registration and validation...

引用

international Conference on 3d Imaging, Modeling, processing, visualization and transmission (3dIMPVT)

作者： J. Guehring Institute for Photogrammetry University of Stuttgart Stuttgart Germany

ISBN: (纸本)0769509843

We present a complete data acquisition and processing chain for the reliable inspection of industrial parts considering anisotropic noise. data acquisition is performed with a stripe projection system that was modeled and calibrated using photogrammetric techniques. Covariance matrices are attached individually to points during 3d coordinate computation. different datasets are registered using a new multi-view registration technique. In the validation step, the registered datasets are compared with the CAd model to verify that the measured part meets its specification. While previous methods have only considered the geometrical discrepancies between the sensed part and its CAd model, we also consider statistical information to decide whether the differences are significant.

关键词： Inspection data acquisition Solid modeling Coordinate measuring machines Measurement standards Calibration Surface reconstruction Covariance matrix Optical sensors Shape measurement

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Multiresolution mesh representation using vertex cluster contraction

Multiresolution mesh representation using vertex cluster con...

引用

IEEE international symposium on Circuits and Systems (ISCAS)

作者： K.F. Chan Y.T. Wong C.W. Kok Department of Electrical and Electronic Engineering Hong Kong University of Science and Technology Hong Kong China

ISBN: (纸本)0780366859

3d models constructed by free-form modeling using triangular meshes have placed rigorous demands upon transmission bandwidth, storage capacity and computational complexity in rendering. This paper discusses the construction and application of multiresolution mesh representation that can accomodate the growing complexity of 3d models by providing streamability, scalability and compression to 3d meshes. A novel mesh simplification algorithm is proposed to generate a series of approximating meshes. The proposed algorithm computes a distortion metric that satisfies the volume preservation and shape preservation criteria. The simplification results are shown to have better visual quality than other algorithms in literature. A new data format was proposed for efficient storage, streaming and scalable recovery with different level-of-details. The bitstream is progressively structured to minimize storage and transmission requirement when compared to ordinary storage methods.

关键词： Water storage Bandwidth Scalability Mesh generation Shape Application software Computer applications visualization Heuristic algorithms Clustering algorithms

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Continuous queries within an architecture for querying XML-represented moving objects 7th

引用

7th international symposium on Spatial and Temporal databases

作者： Brinkhoff, T Weitkämper, J Univ Appl Sci Fachhsch Oldenburg Ostfriesland Wilhelmshaven IAPG D-26121 Oldenburg Germany

ISBN: (纸本)354042301X

The development of spatiotemporal database systems is primarily motivated by applications tracking and presenting mobile objects. Another important trend is the visualization and processing of spatial data using XML-based representations. Such representations will be required by Internet applications as well as by location-based mobile applications, In this paper, an architecture for supporting queries on XML-represented moving objects is presented. An important requirement of applications using such an architecture is to be kept informed about new, relocated, or removed objects fulfilling a given query condition. Consequently, the spatiotemporal database system must trigger its clients by transmitting the required information about the relevant updates. Such queries are called continuous queries. For processing continuous queries, we have to reduce the volume and frequency of transmissions to the clients. In order to achieve this objective, parameters are defined, which model technical restrictions as well as the interest of a client in a distinct update operation. However, delaying or even not transmitting update operations to a client may decrease the quality of the query result. Therefore, measures for the quality of a query result are required.

关键词： XML

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3d shape coding with superquadrics

3D shape coding with superquadrics

引用

IEEE international Conference on Image processing

作者： L. Chevalier F. Jaillet A. Baskurt LIGIM EA 1899 Claude Bernard University Lyon 1 Villeurbanne cedex FRANCE LIGIM Computer Graphics and Image Modeling Laboratory Villeurbanne France

We present a geometric coding method for 3d real and virtual objects transmission and visualization. We describe object surfaces with a set of superellipsoids which are structured with a constructive solid geometry (CSG) tree. An unstructured cloud of 3d points lying on the original object surface is considered as initial data. The tree is obtained using a split and merge algorithm. At each splitting step, the set of points is partitioned into two superellipsoids. The parameters of each ellipsoid is computed with a nonlinear regression technique (Levenberg-Marquardt). This decomposition is stopped when the estimation error reaches a given threshold (the accepted distortion). The objective of the merging algorithm is to reduce the number of superellipsoids used to describe the complex 3d object without increasing the global distortion. This algorithm allows one to merge both connected and non-connected elements of the superellipsoids set obtained from the decomposition step. The whole scheme is applied to synthetic objects.

关键词： Shape deformable models Geometry Clouds Partitioning algorithms Ellipsoids Computer graphics Solid modeling Laboratories Image coding

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Planar patch extraction with noisy depth data

Planar patch extraction with noisy depth data

引用

international Conference on 3d Imaging, Modeling, processing, visualization and transmission (3dIMPVT)

作者： d. Cobzas H. Zhang Department of Computing Science University of Alberta Edmonton AB Canada

ISBN: (纸本)0769509843

This paper presents an algorithm for extracting planar patches by integrating both intensity and range data provided by a stereo system. For dealing with noisy and sparse range data, the initial segmentation is based on intensity information, and then the resulted regions are thresholded using depth data. This new algorithm, different from the existing ones that use only range data in the segmentation process, produces accurate planar patches that are then used for building a panoramic image-based model for mobile robot navigation.

关键词： data mining Image segmentation Clustering algorithms Navigation Robot sensing systems Robot vision systems Virtual reality Stereo vision Buildings Mobile robots

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