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检索条件"任意字段=12th International Conference on Computer-Aided Design and Computer Graphics, CAD/Graphics 2011"

共 163 条记录，以下是41-50 订阅

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Single image based illumination estimation for lighting virtual object in real scene

Single image based illumination estimation for lighting virt...

引用

12th international conference on computer-aided design and computer graphics, cad/graphics 2011

作者： Chen, Xiaowu Wang, Ke Jin, Xin State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and Engineering Beihang University Beijing China

ISBN: (纸本)9780769544977

Rendering virtual objects into real scenes with real illumination can greatly increase the realism of virtual objects and the consistency between the virtual and the real. the main challenge lies in illumination estimation from a single image. this article proposes a novel method of single image based illumination estimation for lighting virtual object in real scene. Only a single image, without any knowledge of the 3D geometry or reflectance, is needed, which greatly increases the applicability of the method. We first estimate coarse scene geometry and intrinsic components including shading image and reflectance image. then the sparse radiance map of the scene is inferred based on the scene geometry and intrinsic components. Finally, the virtual objects are illuminated by the estimated sparse radiance map. Some experimental results show that this method can convincingly light virtual objects into a single real image, without any pre-recorded 3D geometry and reflectance, illumination acquisition equipments or imaging information of the image. © 2011 IEEE.

关键词： Geometry

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An optimal color mapping strategy based on energy minimization for time-varying data

An optimal color mapping strategy based on energy minimizati...

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12th international conference on computer-aided design and computer graphics, cad/graphics 2011

作者： Peng, Yi Dong, Jie Chen, Li Chu, Haiyang Yong, Junhai School of Software Tsinghua University Beijing 100084 China Department of Computer Science and Technology Tsinghua University Beijing 100084 China Key Laboratory for Information System Security Ministry of Education Beijing 100084 China Tsinghua National Laboratory for Information Science and Technology Beijing 100084 China

ISBN: (纸本)9780769544977

Color mapping plays a critical role in visualization of time-varying data and also sets a challenge for researchers due to the consistency of mapping and great changes in time-varying data. In order to solve this problem and generate feature-prominent animation, we present a two phase optimization technique using bilateral filtering and global energy functions. In the first phase, for each time step, we use a weighted mapping function which combines linear mapping and feature histogram. In the second phase, an optimization function taking global color mapping and minimum color difference into consideration is designed. So users can clearly distinguish between data in variable time steps and easily understand the corresponding relationships between different structures. the experiments' results show that our method can achieve high quality visualization for both static and time-varying data. © 2011 IEEE.

关键词： Visualization

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An interactive 3D preoperative planning and training system for minimally invasive vascular surgery

An interactive 3D preoperative planning and training system ...

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12th international conference on computer-aided design and computer graphics, cad/graphics 2011

作者： Huang, Dongjin Tang, Wen Ding, Youdong Wan, Taoruan Chen, Yimin School of Computer Engineering and Science Shanghai University Shanghai China University of Teesside School of Computing Middlesbrough United Kingdom School of Film and TV Arts Technology Shanghai University Shanghai China University of Bradford School of Informatics Bradford United Kingdom

ISBN: (纸本)9780769544977

Virtual reality based preoperative planning for Minimally Invasive Vascular Intervention is useful, not only for increasing the success rate of operation, but also used as a training tool for improving doctors' skills. In this paper we present an interactive 3D preoperative planning and training system with haptic device. In this system, we present an intelligent trajectory planning algorithm for searching an optimal path automatically along the centerline in two ways: from the suitable inserting point to the specific target location or to the most of objectives. Also, for the purpose of interactive training, we connect the haptic device to the end of guide wire and propose an algorithm that enables the simulator to model guide wire and catheter insertions realistically through essential operations i.e. pushing, pulling and twisting actions. We demonstrate experiment results to show that the 3D preoperative planning and training system is usable for simulating guide wire insertion procedures with complex blood vessel structures. © 2011 IEEE.

关键词： Blood vessels

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Creating cylindrical panoramic mosaic from a pipeline video

Creating cylindrical panoramic mosaic from a pipeline video

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12th international conference on computer-aided design and computer graphics, cad/graphics 2011

作者： Niu, Chuan Zhong, Fan Xu, Songhua Yang, Chenglei Qin, Xueying School of Computer Science and Technology Shandong University Jinan China Shandong Provincial Key Laboratory of Software Engineering Jinan China Oak Ridge National Laboratory Oak Ridge TN 37831 United States

ISBN: (纸本)9780769544977

In geological engineering, stratum structure detection is a fundamental problem in project planning and implementation. One of the most commonly employed detection technologies is to take videos of borehole using a forward moving camera. Following this approach, the problem of stratum structure detection is transformed into the problem of constructing a panoramic image from the taken video sequences, which are typically in low quality. In this paper, we propose a novel method to create a panoramic image of the borehole from the video sequence without camera calibration and tracking. To stitch together pixels of neighboring frame images, our camera model is designed with a focal length changing feature, along with a small rotation freedom in the two-dimensional image space. Essentially, our camera model assumes target objects lie on a cylindrical wall and the camera moves forward along the central axis of the cylindrical wall. Our method robustly resolves these two degrees-of-freedoms through KLT feature tracking and constructs a panoramic image by stitching strips. Experiment results show that our method could efficiently generate high-quality panoramas for very long video sequences. © 2011 IEEE.

关键词： computerized tomography

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Fast mesh-free deformations

Fast mesh-free deformations

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9th international conference on computer aided design and computer graphics

作者： Chang, J Yang, XS Zhang, JJ Bournemouth Univ Poole BH12 5BB Dorset England

ISBN: (纸本)0769524737

Mesh-free deformation is an effective method for the simulation of deformable objects and characters in computer animation. It bears the merits of flexible control, good accuracy and easy implementation. Similar to other physically-based deformation techniques, however, computational cost remains a pressing issue, especially for large scale problems. Based on our previous work, in this paper we investigate the underlying structure of the numerical approach in order to speed up the computation. three algorithms are presented and their efficiency and convergence are analysed Our results show that we are able to significantly reduce the computation time and memory usage with little loss in accuracy. the new technique is capable of achieving interactive frame rates with large models.

关键词： deformation mesh-free computer animation physically-based modeling

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Search and retrieval in cad databases a user-centric state-of-the-art overview 12

Search and retrieval in CAD databases a user-centric state-o...

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12th international Joint conference on computer Vision, Imaging and computer graphics theory and Applications, VISIGRAPP 2017

作者： Schinko, Christoph Vosgien, thomas Prante, thorsten Schreck, Tobias Ullrich, Torsten Fraunhofer Austria Research GmbH Visual Computing Graz Graz Austria Institute of Computer Graphics and Knowledge Visualization Graz University of Technology Graz Austria V-Research GmbH Dornbirn Austria

ISBN: (纸本)9789897582240

this article presents a state-of-the-art overview on shape, information and design retrieval systems in the context of cad engineering. In contrast to existing surveys, we classify the different approaches from a cad application user point of view. As a consequence, we focus on features of surveyed techniques such as: Supported shape data types, handling of geometric invariances, support of metadata, supported query types, quality of retrieval results, and the availability of implementations. © 2017 by SCITEPRESS - Science and Technology Publications, Lda.

关键词： computer aided design

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Graphic identification system's design and research based on graphics primitive

Graphic identification system's design and research based on...

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international conference on Information and Computing Science

作者： Zhao, Hong-Ying Tang, Jing-Qiu North China Electric Power University Baoding Hebei province China

ISBN: (纸本)9780769543789

To resolve the difficulty of reading and identifying the cad graphics file about automatic distinguishing and judging of cad graphics file, this paper propses a cad graphics identification method based on the graphics primitive. In this method, the cad graphics is exploded to graphics primitive and read the graphics attribute. According to the comparison results of the identified graphics and standard graphics, the graphics primitives are differentiated with their graphics attributs. the graphics identification is finished by reading different sorts of graphics primitives. © 2011 IEEE.

关键词： computer aided design

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Analysis of surfaces creation methods in computer graphics tools

Analysis of surfaces creation methods in computer graphics t...

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11th international conference on "the Experience of designing and Application of cad Systems in Microelectronics", cadSM 2011

作者： Shtunder, Oksana Dyvak, Mykola Shevchuk, Ruslan Faculty of Computer Information Technologies Ternopil National Economic University 9 Yunosti Street Ternopil 46018 Ukraine

ISBN: (纸本)9789662191165

关键词： computer aided design

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Application of fractal theory in packaging graphic design 12

Application of fractal theory in packaging graphic design

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12th international conference on Measuring Technology and Mechatronics Automation, ICMTMA 2020

作者： Wang, Jiahui Yinxing Hospitality Management College of CUIT Chengdu611743 China

ISBN: (数字)9781728170817

ISBN: (纸本)9781728170817

In this paper, the fractal theory is applied to the packaging design system to simulate the typical fractal graphics on the computer. the purpose is to perform the packaging design, the propaganda of packaging goods and the anti-counterfeiting of packaging logo with the help of the characteristics of fractal graphics. In packaging design, it is often necessary to design more arbitrary graphics based on the consideration of anti-counterfeiting, and sometimes more abstract and realistic three-dimensional graphics are needed to meet the aesthetic needs of consumers. the software with functions focused on graphics and image processing and structure design can not complete this task well. In this paper, IFS algorithm in fractal generation algorithm is studied based on the characteristics of packaging and decoration graphics, and the IFS parameters are changed to generate new graphics by using Visual C++, to realize the practical application of IFS algorithm using fractal theory. © 2020 IEEE.

关键词： computer aided design

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Evaluation of the Degree of Malignancy of Lung Nodules in Computed Tomography Images 12

Evaluation of the Degree of Malignancy of Lung Nodules in Co...

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12th international Joint conference on computer Vision, Imaging and computer graphics theory and Applications (VISIGRAPP)

作者： Goncalves, L. Novo, J. Cunha, A. Campilho, A. INESC TEC INESC Technol & Sci FEUP Campus P-4200465 Porto Portugal Univ A Coruna Dept Comp Sci Campus Elvina La Coruna 15071 Spain Univ Tras Os Montes & Alto Douro P-5000801 Vila Real Portugal Univ Porto Fac Engn FEUP Campus P-4200465 Porto Portugal

ISBN: (纸本)9789897582271

In lung cancer diagnosis, the design of robust computer aided Diagnosis (cad) systems needs to include an adequate differentiation of benign from malignant nodules. this paper presents a cad system for the classification of lung nodules in chest Computed Tomography (CT) scans as the way to diagnose lung cancer. the proposed method measures a set of 295 heterogeneous characteristics, including morphology, intensity or texture features, that were used as input of different KNN and SVM classifiers. the system was modeled and trained using a groundtruth provided by specialists taken from a public lung image dataset, the Lung Image Database Consortium and Image Database Resource Initiative (LIDC-IDRI). this image dataset includes chest CT scans with lung nodule location together with information about the degree of malignancy, among other properties, provided by multiple expert clinicians. In particular, the computed degree of malignancy try to follow the manual labeling by the different radiologists. Promising results were obtained with a first order SVM with an exponential kernel achieving an area under the receiver operating characteristic curve of 96.2 +/- 0.5% when compared with the groundtruth provided in the public CT lung image dataset.

关键词： Medical Diagnostic Imaging computer-aided Diagnosis Computed Tomography Machine Learning Feature Extraction

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