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检索条件"任意字段=9th International Conference on Computer Aided Design and Computer Graphics, CAD/CG 2005"

共 64 条记录，以下是41-50 订阅

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Proceedings Ninth international conference on computer aided design and computer graphics

Proceedings Ninth International Conference on Computer Aided...

引用

9th international conference on computer aided design and computer graphics, cad/cg 2005

ISBN: (纸本)0769524737

the proceedings contain 82 papers. the topics discussed include: a robust iterative method devoted to pole curve fitting;evolution of 3D curves under strict spatial constraints;a fitting approach with dynamic algebraic spline curves;a method of generating smooth surface using C-curves;determination of free parameters in algebraic surface blending;surface blending with curvature continuity;the constraint elevation for parametric continuity order of NURBS curve and surface;subdivision surfaces based on point-based splines;adaptive refinement scheme for subdivision surfaces based on triangular meshes;high quality triangulation of implicit surfaces;implicit fitting and smoothing using radial basis functions with partition of unity;fast mesh-free deformations;3D model retrieval based on orthogonal projections;and rod-like trabeculae extraction from cancellous bone microstructure using topological analysis.

关键词： computer aided design

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Refractive index and transmission coefficient recovery algorithm of crystal-like objects

Refractive index and transmission coefficient recovery algor...

引用

9th international conference on computer aided design and computer graphics, cad/cg 2005

作者： Sun, Yan-Kui Tong, Xi-Peng Wang, Wei Yu, Hong-Chuan Department of Computer Science and Technology Tsinghua University Beijing 100084 China

ISBN: (纸本)0769524737

Current inverse global illumination techniques focus on the investigation of opaque objects. In this paper, we present a new method for recovering material properties of crystal-like objects. First of all, the objects in the image are separated into two classes: the opaque objects and the translucent objects. For the translucent objects, by analyzing refractive phenomena, we propose a method to recover an approximation of the refractive index and transmission coefficients. First, obtain the refractive index with the minimum error of color variance by a certain step calculations and then iteratively recover the color parameters. Experiments show that our algorithms can be completed in few iterative steps, and recovery error is very small. With the recovered material properties, the scene can be rendered under novel lighting or viewing conditions, and it can also be rendered when new objects are added into the scene. © 2005 IEEE.

关键词： Image analysis

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An interactive system for visualizing 3D human organ models

An interactive system for visualizing 3D human organ models

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9th international conference on computer aided design and computer graphics, cad/cg 2005

作者： Wong, Un-Hong Wong, Hon-Cheng Tang, Zesheng Faculty of Information Technology Macao University of Science and Technology Avenida Wai Long Taipa China

ISBN: (纸本)0769524737

Demonstrations play a major role in education process. Although many specimen are readily available, particularly in medicine and biology, demonstrations are commonly performed by showing these static specimen to medical or biological students. Interactive demonstrations can significantly impacts learning. An interactive system for visualizing 3D human organ models can fulfill this need. In this paper, we present techniques to realize such a system which can let the user select and view one or several major organ models extracted from segmented Visible Human dataset interactively through a simple graphical user interface. the stereoscopic views of these organ models are also achieved with this system running on a PC-based stereo-ready system. In our system, the Marching Cubes algorithm is used but new implementation we proposed to greatly improve both the speed and quality of surface rendering results is performed. this new implementation can generate the Marching Cubes cases on-the-fly within the surface extraction process of the models by considering the relationship of the vertices, borders, and surfaces of each voxel. We also describe a new method for specifying the normals for the extracted triangles without the need of physical information (such as intensity values stored in a medical Computed Tomography (CT) dataset) stored in the voxels. these normals will be used for lighting the extracted models later. Furthermore, a memory arrangement scheme is designed to enhance the usability of the system. © 2005 IEEE.

关键词： Interactive computer systems

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Architecture for direct model-to-part CNC manufacturing

Architecture for direct model-to-part CNC manufacturing

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9th World Multi-conference on Systemics, Cybernetics and Informatics

作者： Poon, Gilbert Gray, Paul J. Bedi, Sanjeev Miller, Daniel Univ Waterloo Dept Mech Engn Waterloo ON N2L 3G1 Canada

ISBN: (纸本)9789806560543

In the traditional paradigm for computer Numerical Control (CNC) machining, tool paths are programmed offline from the CNC machine using the computer-aided design (cad) model of the workpiece. the program is downloaded to the CNC controller and the part is then machined. Since a cad model does not exist inside the CNC controller, it is unaware of the part to be machined and cannot predict or prevent errors. Not only is this paradigm labor intensive, it can lead to catastrophic damage if there are errors during machining. this paper presents a new concept for CNC machine control whereby a cad model of the workpiece exists inside the controller and the tool positions are generated in real-time by the controller using the computer's graphics hardware without human intervention. the new concept was implemented on an experimental lathe machine specifically designed to machine complicated ornamental wood workpieces with a personal computer. An example workpiece was machined and measured using a 3D camera. the measured data was registered to the cad model to evaluate machining accuracy.

关键词： CNC manufacturing computer graphics automated machining real-time tool positioning machine control surface machining

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Proceedings Ninth international conference on computer aided design and computer graphics: Preface

Proceedings - Ninth International Conference on Computer Aid...

引用

Proceedings - Ninth international conference on computer aided design and computer graphics, cad/cg 2005 2005年 2005卷 xi页

作者： Yuen, Matthew

No abstract available

ISBN: (纸本)0769524737

No abstract available

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A web services based platform for exchange of procedural cad models

A web services based platform for exchange of procedural CAD...

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9th international conference on computer Supported Cooperative Work in design

作者： Chen, X Li, M Gao, SM Zhejiang Univ State Key Lab CAD&CG Hangzhou 310027 Peoples R China

ISBN: (纸本)1846000025

Exchange of procedural cad models between heterogeneous cad systems is still a challenging issue in cad area. Previously we proposed an approach for effectively constructing synchronized collaborative design environment based on heterogeneous cad systems. In this paper, we extend the synchronized collaborative design environment that we have developed to a web services based platform for exchange of procedural cad models between heterogeneous cad systems. First, the real-time exchange of a single operation is extended to the exchange of the complete procedural cad model between heterogeneous cad systems. Furthermore, web services technology is adopted to encapsulate the procedural cad model exchange functions, which are then released on the Internet as a standard interface and can be used by remote developers in their windows applications, web applications, and so on. Finally, a web service for exchange of procedural cad models between SolidWorks and Autodesk Mechanical Desktop is realized.

关键词： procedural cad model exchange heterogeneous cad systems synchronized collaborative design system web services

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Virtual assembly and tolerance analysis for collaborative design

Virtual assembly and tolerance analysis for collaborative de...

引用

9th international conference on computer Supported Cooperative Work in design

作者： Liu, ZY Tan, JR Zhejiang Univ State Key Lab CAD&CG Hangzhou 310027 Peoples R China

ISBN: (纸本)1846000025

Virtual assembly and tolerance analysis are effective tools to avoid assembly conflicts between components designed by different cad teams during collaborative product design. this paper develops a virtual assembly and tolerance analysis system supporting collaborative product design and puts forward a component model expression method based on assembly ports as well as giving approaches to interactive assembly and tolerance analysis in virtual environment, which include recognition of assembly relation based on assembly ports, partial disassembly in assembly procedure, assembly movement navigation, recording of assembly procedure and tolerance information visualization. Besides, the paper also realizes the reusing of virtual assembly procedure to support modification and refinement of components' structure in collaborative product design.

关键词： virtual assembly virtual reality collaborative design

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A novel approach for interorganizational workflow system design

A novel approach for interorganizational workflow system des...

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9th international conference on computer Supported Cooperative Work in design

作者： Yin, JW Feng, ZL Liu, XM Dong, JX State Key Laboratory of CAD and CG Zhejiang University Hangzhou 310027 China College of Zhijiang Zhejiang University of Technology Hangzhou 310024 China

ISBN: (纸本)1846000025

Currently available workflow management systems lack abilities for supporting interorganizational processes In this paper we present an approach to model interorganizational business processes based on the Pi-Calculus technique. this approach provides a formal foundation for processes with interorganizational interaction structures, appropriate for modeling distributed cooperative workflow systems.

关键词： workflow interorganizational business process Pi-Calculus

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Multi-level access control for collaborative cad

Multi-level access control for collaborative CAD

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9th international conference on computer Supported Cooperative Work in design

作者： Fang, CH Peng, W Ye, XZ Zhang, SY Zhejiang Univ Coll Comp Sci State Key Lab CAD&CG Hangzhou 310027 Peoples R China

ISBN: (纸本)1846000025

Access control is one of the key steps to ensuring the availability, confidentiality and integrity of system resources. While it has been fully applied in various network systems, it's still relatively new for collaborative cad. this paper provides a new framework of multi-level access control for collaborative cad based on Hierarchical Product Modeling. A Layered Privilege Model (LPM) has been developed to provide multi-granularity access permissions in the part level and feature level. An Extended Hierarchy Role-Based Access Control (EHRBAC) is implemented, integrated with LPM and common Hierarchy RBAC, to provide hierarchical access control of collaborative feature modeling in the component/part level and design feature level. Mesh simplification techniques are used to create variable level-of-detail for individual features.

关键词： collaborative design cad access control CSCW

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3D-NCuts: Adapting normalized cuts to 3D triangulated surface segmentation

3D-NCuts: Adapting normalized cuts to 3D triangulated surfac...

引用

9th international conference on computer graphics theory and Applications, GRAPP 2014

作者： Toony, Zahra Laurendeau, Denis Giguère, Philippe Gagné, Christian Computer Vision and System Laboratory Department of Electrical and Computer Engineering Université Laval Québec QC Canada Department of Computer Science and Software Engineering Université Laval Québec QC Canada

ISBN: (纸本)9789897580024

Being able to automatically segment 3D models into meaningful parts is an important goal in 3D shape processing. In this paper, we are proposing a fast and easy-to-implement 3D segmentation approach, which is based on spectral clustering. For this purpose, we define an improved formulation of the similarity matrix which allows our algorithm to segment both free-form and cad (computer aided design) 3D models. In 3D space, different shapes, such as planes and cylinders, have different surface normal distributions. We defined the similarity of vertices based on their normals which can segment a 3D model into its geometric features. Results show the effectiveness and robustness of our method in segmenting a wide range of 3D models. Even in the case of complex models, our method results in meaningful segmentations. We tested our segmentation approach on real data segmentation, in the presence of noise and also in comparison with other methods which provided good results in all cases.

关键词： computer aided design

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