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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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Efficient discovery service for a digital library of 3d models

Efficient discovery service for a digital library of 3D mode...

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

作者： H. Anan K. Maly M. Zubair Old Dominion University Norfolk VA USA

Many geographically distributed experts in different areas such as medical imaging, e-commerce, and digital museums, are in need of 3d models. Although 3d models are becoming widely available due to the recent technological advancement and modeling tools, we lack a digital library system where they can be searched and retrieved efficiently. In this paper, we focus on an efficient discovery service consisting of multilevel hierarchical browsing service that enables users to navigate large sets of 3d models. For this purpose, we use shape based clustering to abstract a large set of 3d models to a small set of representative models (key models). Our service applies clustering recursively to limit the number of key models that a user views at a time. Clustering is derived from metrics that are based on a concept of compression and similarity computation using surface signatures. Signatures are the two-dimensional representations of a 3d model and they can be used to define similarity between 3d models. We integrated the proposed browsing capability with 3dLIB, (a digital library for 3d models that we are building at Old dominion University), and evaluated the proposed browsing service using the Princeton Shape Benchmark (PSB). Our evaluation shows significant better precision and recall as compared to other approaches.

关键词： Software libraries Shape Feature extraction Navigation data mining Biomedical imaging Electronic commerce Content based retrieval Information retrieval delay

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An efficient scattered data approximation using multilevel B-splines based on quasi-interpolants

An efficient scattered data approximation using multilevel B...

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

作者： Byung-Gook Lee Joon Jae Lee Jaechil Yoo Division of Computer and Information Engineering Dong Seo University Busan South Korea Department of Mathematics Dongeui University Busan South Korea

ISBN: (纸本)0769523277

In this paper, we propose an efficient approximation algorithm using multilevel B-splines based on quasi-interpolants. Multilevel technique uses a coarse to fine hierarchy to generate a sequence of bicubic B-spline functions whose sum approaches the desired interpolation function. To compute a set of control points, quasi-interpolants gives a procedure for deriving local spline approximation methods where a B-spline coefficient only depends on data points taken from the neighborhood of the support corresponding the B-spline. Experimental results show that the smooth surface reconstruction with high accuracy can be obtained from a selected set of scattered or dense irregular samples.

关键词： Scattering Spline Surface reconstruction Approximation algorithms Interpolation Tensile stress Surface fitting Approximation methods Approximation error Sampling methods

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Incremental Catmull-Clark subdivision

Incremental Catmull-Clark subdivision

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

作者： H.-R. Pakdel F. Samavati University of Calgary Canada

In this paper, a new adaptive method for Catmull-Clark subdivision is introduced. Adaptive subdivision refines specific areas of a model according to user or application needs. Naive adaptive subdivision algorithm changes the connectivity of the mesh, causing geometrical inconsistencies that alter the limit surface. Our method expands the specified region of the mesh such that when it is adaptively subdivided, it produces a smooth surface whose selected area is identical to when the entire mesh is refined. This technique also produces a surface with an increasing level of detail from coarse to fine areas of the surface. We compare our adaptive subdivision with other schemes and present some example applications.

关键词： Animation Application software Tensile stress Geometry data structures Refining Packaging Spline Surface topography Surface reconstruction

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Automatic burr detection on surfaces of revolution based on adaptive 3d scanning

Automatic burr detection on surfaces of revolution based on ...

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

作者： K. Claes T.P. Koninckx H. Bruyninckx Department of Mechanical Engineering ESAT Leuven Belgium Department of Electrical Engineering ESAT Leuven Belgium

This paper describes how to automatically extract the presence and location of geometrical irregularities on a surface of revolution. To this end a partial 3d scan of the workpiece under consideration is acquired by structured light ranging. The application we focus on is the detection and removal of burrs on industrial workpieces. Cylindrical metallic objects cause a strong specular reflection in every direction. These highlights are compensated for in the projected patterns, hence 'adaptive 3d scanning'. The triangular mesh produced is then used to identify the axis and generatrix of the corresponding surface of revolution. The search space for finding this axis is four dimensional: a valid choice of parameters is two orientation angles (as in spherical coordinates) and the 2d intersection point with the plane spanned by two out of three axis of the local coordinate system. For finding the axis we test the circularity of the planar intersections of the mesh in different directions, using statistical estimation methods to deal with noise. Finally the 'ideal' generatrix derived from the scan data is compared to the real surface topology. The difference identifies the burr. The algorithm is demonstrated on a metal wheel that has burrs on both sides. Visual servoing of a robotic arm based on this detection is work in progress.

关键词： Robotics and automation Testing Robot kinematics Optical reflection Service robots Manufacturing automation Topology Wheels Visual servoing Mobile robots

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From range data to animated anatomy-based faces: a model adaptation method

From range data to animated anatomy-based faces: a model ada...

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

作者： Yu Zhang T. Sim Chew Lim Tan Department of Computer Science School of Computing National University of Singapore Singapore

This paper presents a new method for reconstructing animated, anatomy-based facial models of individuals from range data with minimal manual intervention. A prototype model with a multi-layer skin-muscle-skull structure serves as the starting point for our method. After the global adaptation, the skin mesh of the prototype model is represented as a dynamic deformable model which is deformed to fit scanned data according to internal force stemming from the elastic properties of the surface and external forces produced from the scanned data points and features. The underlying muscle layer that consists of three types of facial muscles is automatically adapted. According to the adapted skin and muscle structures, a set of automatically generated skull feature points is transformed to drive a volume morphing of the template skull model for skull fitting. The reconstructed model realistically reproduces the shape and features of a specific person and can be animated instantly.

关键词： Facial animation Adaptation model Skull Prototypes Skin Muscles Image reconstruction deformable models Shape Computer graphics

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Robust and accurate partial surface registration based on variational implicit surfaces for automatic 3d model building

Robust and accurate partial surface registration based on va...

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

作者： P. Claes d. Vandermeulen L. Van Gool P. Suetens ESAT/PSI/Medical Image Computing Katholieke Universiteit Leuven Belgium ESAT/PSI/VISICS Katholieke Universiteit Leuven Belgium

Three-dimensional models are often assembled from several partial reconstructions from unknown viewpoints. In order to provide a fully automatic, robust and accurate method for aligning and integrating partial reconstructions without any prior knowledge of the relative viewpoints of the sensor or the geometry of the imaging process, we propose a 4-step registration and integration algorithm based on a common Variational Implicit Surface (VIS) representation of the partial surface reconstructions. First, a global crude registration without a priori knowledge is performed followed by a pose refinement of partial reconstruction pairs. Pair-wise registrations are converted into a multi-view registration, before a final integration of the reconstructions into one entity or model occurs. Furthermore, making use of the smoothing properties of the VIS representations, the algorithm proves to be robust against noise in the reconstruction data. Experimental results on real-live, as well as noiseless and noisy simulated data are presented to show the feasibility, the accuracy and robustness of our registration scheme.

关键词： Image reconstruction Surface reconstruction Biomedical imaging Geometry Smoothing methods Noise robustness Cameras Image sensors Assembly systems Calibration

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Image-gradient-guided real-time stereo on graphics hardware

Image-gradient-guided real-time stereo on graphics hardware

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

作者： Minglun Gong Ruigang Yang Department of Math & Computer Science Laurentian University Greater Sudbury ONT Canada Department of Computing Science University of Kentucky Lexington KY USA

ISBN: (纸本)0769523277

We present a real-time correlation-based stereo algorithm with improved accuracy. Encouraged by the success of recent stereo algorithms that aggregate the matching cost based on color segmentation, a novel image-gradient-guided cost aggregation scheme is presented in this paper. The new scheme is designed to fit the architecture of recent graphics processing units (GPUs). As a result, our stereo algorithm can run completely on the graphics board: from rectification, matching cost computation, cost aggregation, to the final disparity selection. Compared with many real-time stereo algorithms that use fixed windows, noticeable accuracy improvement has been obtained without sacrificing realtime performance. In addition, existing global optimization algorithms can also benefit from the new cost aggregation scheme. The effectiveness of our approach is demonstrated with several widely used stereo datasets and live data captured from a stereo camera.

关键词： Hardware Stereo vision Cost function Aggregates Computer graphics Image segmentation Computational efficiency Cameras Computer vision Central processing Unit

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Gaussian scale-space dense disparity estimation with anisotropic disparity-field diffusion

Gaussian scale-space dense disparity estimation with anisotr...

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

作者： Jangheon Kim T. Sikora Department of Communication Systems Technical University Berlin Berlin Germany

We present a new reliable dense disparity estimation algorithm which employs Gaussian scale-space with anisotropic disparity-field diffusion. This algorithm estimates edge-preserving dense disparity vectors using a diffusive method on iteratively Gaussian-filtered images with a scale, i.e. the Gaussian scale-space. While a Gaussian filter kernel generates a coarser resolution from stereo image pairs, only strong and meaningful boundaries are adoptively selected on the resolution of the filtered images. Then, coarse global disparity vectors are initialized using the boundary constraint. The per-pixel disparity vectors are iteratively obtained by the local adjustment of the global disparity vectors using an energy-minimization framework. The proposed algorithm preserves the boundaries while inner regions are smoothed using anisotropic disparity-field diffusion. In this work, the Gaussian scale-space efficiently avoids illegal matching on a large baseline by the restriction of the range. Moreover, it prevents the computation from iterating into local minima of ill-posed diffusion on large gradient areas e.g. shadow and texture region, etc. The experimental results prove the excellent localization performance preserving the disparity discontinuity of each object.

关键词： Anisotropic magnetoresistance Iterative algorithms Energy resolution Gaussian processes Kernel Image resolution Adaptive filters data mining Feature extraction Computer vision

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A novel data distribution management scheme to support synchronization in large-scale distributed virtual environments

A novel data distribution management scheme to support synch...

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IEEE international symposium on Virtual Environments, Human-Computer Interfaces and Measurement Systems (VECIMS)

作者： A. Boukerche N.J. McGraw R.B. Araujo Paradise Research Laboratory Site University of Ottawa Ottawa Canada University of North Texas Denton TX USA Networked Virtual Reality Laboratory Federal University of São Carlos Sao Paulo Brazil

In large-scale distributed virtual environments - LdVEs - extensive and/or multidimensional virtual 3d environments can be shared by thousands of participant users in applications ranging from multiplayer games to virtual cities, virtual shopping mall, open space military training etc. In such systems, distribution seems inherent. The world geometric data of an extensive region or terrain may need to be divided in areas, which are distributed across the network. By distributing the data, host memory use and processing power are reduced since less data needs to be received, processed and stored. However, these gains can be easily surpassed by the amount of traffic generated by the synchronization messages transmitted, as well as the processing time due to the control infrastructure and the bulky data transmission of parts of the distributed VE. So, good mechanisms for data distribution management (ddM) are an important requirement for LdVEs. This paper describes the grid filtered region-based (GFRB) ddM scheme, which combines the positive aspects of both region-based and grid-based ddM methods to reduce network traffic and latency in LdVEs using a minimum number of multicast groups. GFRB scheme is unique because it provides a finer grained mechanism to exact match publishers to subscribers with intersecting regions. It does that with a reduced number of messages and multicast groups, by taking into consideration the percentage of overlap of a region on a cell. Experimental results show that GFRB scheme can be a potential solution to data synchronization in large distributed virtual environments.

关键词： Environmental management Large-scale systems Virtual environment distributed decision making Multidimensional systems Cities and towns Management training Communication system traffic control distributed power generation data communication

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dynamically optimised 3d (virtual reality) data transmission for mobile devices

Dynamically optimised 3D (virtual reality) data transmission...

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2nd international symposium on 3d data processing, visualization, and transmission (3dPVI 2004)

作者： Feisst, M Christ, A Univ Appl Sci Offenburg Offenburg Germany

ISBN: (纸本)0769522238

Nowadays the processing power of mobile phones, Smartphones and PdA's is increasing as well as the transmission bandwidth. Nevertheless there is still the need to reduce the content and the need of processing the data. discussed will be proposals and solutions for dynamic reduction of the transmitted content. For that, device specific properties will be taken into account, as much as for the aim to reduce the need of processing power at the client side to be able to display the 3d (Virtual Reality) data. Therefore, well known technologies e.g. data compression are combined with new developed ideas to reach the goal of adaptive content transmission. To achieve a device dependant reduction of processing power the data have to be pre processed at the server side or the server even has to take over functionality of weak mobile devices.

关键词： Virtual reality

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