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2013 17th International Conference on Information Visualisation, IV 2013

作者： Zhao, Youbing Clapworthy, Gordon J. Kohout, Josef Dong, Feng Tao, Yubo Wei, Hui McFarlane, Nigel Centre for Computer Graphics and Visualisation University of Bedfordshire United Kingdom Department of Computer Science and Engineering University of West Bohemia Plzeò Czech Republic State Key Lab. of CAD and CG Zhejiang University Hangzhou China

ISBN: (纸本)9780769550497

In many biomedical applications, it is often desired to simulate, analyse and visualise the dynamics of a particular patient based on a patient-specific musculoskeletal model. However, reconstructing a patient-specific model directly from medical images is highly lab.ur intensive, and impractical in the clinical context. A more efficient method is to derive it from an atlas musculoskeletal model using patient-specific hints. In this paper, Laplacian mesh processing is introduced to deform an atlas model to a patient-specific model, based on patient-specific landmarks extracted from two orthogonal clinical images and using least-squares error optimization. Muscle attachment landmarks and motion landmarks in the atlas are also transformed as part of the process. Drift and inter-surface penetrations are prevented by supplementary inter-surface landmarks. Mesh simplification and reconstruction are used to avoid out-of-memory failures that may result from trying to deform models at high resolution. © 2013 IEEE.

关键词： Deformation

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Laplacian Musculoskeletal Deformation for Patient-Specific Simulation and Visualisation

Laplacian Musculoskeletal Deformation for Patient-Specific S...

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International Conference on Information Visualisation (IV)

作者： Youbing Zhao Gordon J. Clapworthy Josef Kohout Feng Dong Yubo Tao Hui Wei Nigel McFarlane Centre for Computer Graphics and Visualisation University of Bedfordshirc UK Department of Computer Science & Engineering University of West Bohemia Plzeñ Czech Rep State Key Lab. of CAD&CG Zhejiang University Hangzhou China

关键词： Laplace equations Deformable models Linear systems Muscles Bones Surface treatment

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Opacity volume based halo generation for enhancing depth perception

Opacity volume based halo generation for enhancing depth per...

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12th International Conference on computer-Aided Design and computer graphics, cad/graphics 2011

作者： Tao, Yubo Lin, Hai Dong, Feng Clapworthy, Gordon State Key Lab. of CAD and CG Zhejiang University China Centre for Computer Graphics and Visualisation University of Bedfordshire United Kingdom

ISBN: (纸本)9780769544977

Halos are usually used to enhance depth perception and display spatial relationships in illustrative visualization. In this paper, we present a simple and effective method to create volumetric halo illustration. In the pre-processing stage, we generate a view-independent halo intensity volume, which contains all potential halos around the boundaries of features, based on the opacity volume on graphic hardware. During halo rendering, the halo intensity volume is used to extract halos only around the contours of structures for the current viewpoint. The performance of our approach is significantly faster than previous halo illustration methods, which perform both halo generation and rendering during volume rendering. Experimental results demonstrate volumetric halo effects and the efficiency of the proposed approach. © 2011 IEEE.

关键词： Volume rendering

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Laplacian lines for real-time shape illustration 09

Laplacian lines for real-time shape illustration

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2009 ACM SIGGRAPH Symposium on Interactive 3D graphics and Games, I3D 2009

作者： Zhang, Long He, Ying Xie, Xuexiang Chen, Wei Institute of Graphics and Image Hangzhou Dianzi University China School of Computer Engineering Nanyang Technological University Singapore State Key Lab. of CAD and CG Zhejiang University China

ISBN: (纸本)9781605584294

This paper presents a novel object-space line drawing algorithm that can depict shape with view dependent feature lines in real-time. Strongly inspired by the Laplacian-of-Gaussian (LoG) edge detector in image processing, we define Laplacian Lines as the zero-crossing points of the Laplacian of the surface illumination. Compared to other view dependent features, Laplacian lines are computationally efficient because most expensive computations can be pre-processed. Thus, Laplacian lines are very promising for interactively illustrating large-scale models. Copyright © 2009 by the Association for Computing Machinery, Inc.

关键词： Image processing

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Interactive browsing of large images on multi-projector display wall system

Interactive browsing of large images on multi-projector disp...

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12th International Conference on Human-computer Interaction, HCI International 2007

作者： Zhongding, Jiang Xuan, Luo Yandong, Mao Binyu, Zang Hai, Lin Hujun, Bao Computer Graphics Lab. Software School Fudan University Shanghai China State Key Lab. of CAD and CG Zhejiang University Hangzhou China

ISBN: (纸本)9783540731061

With the precision of data acquisition increases, large images that may occupy terabytes, become common in research and industry fields. Since multi-projector display wall systems can provide higher resolution, they becomes paramount to display the large images. In this paper, we present one large image viewing system designed for display wall system. Our system need not totally downloading the whole image data to each rendering node. It enables users to browse the out-of-core images in real time using data streaming techniques. In the system, the original out-of-core raw image is compressed and represented using one hierarchical structure in multi-resolution manner. We design one proxy architecture that interactive streams data from remote data server to all rendering nodes. Our system allows users to interactively pan, and zoom the large images with versatile graphical user interface. © Springer-Verlag Berlin Heidelberg 2007.

关键词： Image retrieval

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Stretch-based tetrahedral mesh manipulation 07

Stretch-based tetrahedral mesh manipulation

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graphics Interface 2007

作者： Song, Wenhao Liu, Ligang Computer Graphics Department Max-Planck-Institut Informatik Saarbrücken Germany Department of Mathematics State Key Lab. of CAD and CG Zhejiang University China

ISBN: (纸本)1568813376

We present a novel least scaling distortion metric to measure the deformation distortion for tetrahedral meshes. The stretch-like metric is a combination of Jacobian matrix norm and tetrahedron volume and has the properties of good shape preservation and rotation invariance. Based on our metric, we propose a uniform non-linear optimization solution to a variety of tetrahedral mesh manipulation applications including shape deformation, interpolation, deformation transfer, and deformation learning. Our approach can produce volume preserving and flip free tetrahedral mesh results, which performs much better than the previous tetrahedral manipulation approaches. We also demonstrate an efficient and practical application using free-form deformation technique. The object is embedded in a rough control tetrahedral mesh and deformed by editing the tetrahedral mesh with various constraints. Each vertex of the object can be obtained by its barycentric coordinates according to its embedding tetrahedron of the control tetrahedral mesh.

关键词： Image analysis

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Multi-projector display wall system for windows desktop applications

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Journal of Computational Information Systems 2007年第1期3卷 397-403页

作者： Jiang, Zhongding Mao, Yandong Qin, Bo Jiang, Nan Zang, Binyu Bao, Hujun Computer Graphics Laboratory Software School Fudan University Shanghai 201203 China State Key Lab. of CAD and CG Zhejiang University Hangzhou 310027 China

Large-format high-resolution display systems are increasingly adopted in virtual reality, digital museum, scientific visualization, and other application fields. Traditionally, wall size display system is driven by a cluster of PCs or special high end graphics supercomputer. With the rapid advance of PC graphics hardware, one inexpensive mainstream PC has the power to drive multiple high-resolution displays. This paper proposes one multi-projector display wall system driven by single PC. Besides graphics intensive applications, this system can transparently and efficiently display windows desktop applications without modifying the source code. It takes advantage of the bandwidth of PCI Express bus, and supports at least triple projectors, which is suitable for constructing immersive virtual reality center. Design geometric alignment and photometric correction methods are given to display the frame buffer content seamlessly on the planar display screen. Experimental results show that this system can achieve real time refresh rates. It does little side effect on the performance of common non-graphics windows desktop applications.

关键词： Display devices

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Surface reconstruction of freeform objects based on hierarchical space decomposition

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International Journal of Shape Modeling 2003年第2期9卷 177-190页

作者： Azernikov, Sergei Fischer, Anath Lab. for Computer Graphics and CAD Faculty of Mechanical Engineering Technion Haifa 32000 Israel

This paper describes a new and fast method for reconstructing a 3D computerized model from a cloud of points sampled from the object's surface. The proposed method aggregates very large scale 3D scanning data into a Hierarchical Space Decomposition Model (HSDM), realized by the Octree data structure. This model can represent both the boundary surface and the interior volume of an object. Based on the proposed volumetric model, the boundary reconstruction process becomes more robust and stable with respect to sampling noise. The hierarchical structure of the proposed volumetric model enables data reduction, while preserving critical geometrical features and object topology. As a result of data reduction, the execution time of the reconstruction process is significantly reduced. Moreover, the proposed model naturally allows multiresolution boundary extraction, represented by a mesh with regular properties. The proposed surface reconstruction approach is based on Connectivity Graph extraction from HSDM, and facet reconstruction. This method's feasibility will be presented on a number of complex objects.

关键词： Image reconstruction

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Surface Reconstruction of Freeform Objects Based on Multiresolution Volumetric Method

Surface Reconstruction of Freeform Objects Based on Multires...

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作者： Azernikov, Sergei Miropolsky, Alex Fischer, Anath Lab. for Computer Graphics and CAD Department of Mechanical Engineering Technion-Israel Inst. of Technology Haifa 32000 Israel

Recently developed 3D scanning devices are capable of capturing point clouds, as well as additional information, such as normals and texture. This paper describes a new and fast reverse engineering method for creating a 3D computerized model from data captured by such contemporary 3D scanning devices. The proposed method aggregates large-scale 3D scanned data into an extended Hierarchical Space Decomposition Model (HSDM) based on Octree data structure. This model can represent both an object's boundary surface and its interior volume. The HSDM enables data reduction, while preserving sharp geometrical features and object topology. As a result the execution time of the reconstruction process is significantly reduced. Moreover, the proposed model naturally allows multiresolution surface reconstruction, represented by a mesh with regular properties. Based on the proposed volumetric model, the surface reconstruction process becomes, more robust and stable with respect to sampling noise.

关键词： Reverse engineering

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Surface reconstruction of freeform objects based on multiresolution volumetric method

Surface reconstruction of freeform objects based on multires...

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Eighth ACM Symposium on Solid Modeling and Applications

作者： Azernikov, Sergei Miropolsky, Alex Fischer, Anath Lab. for Computer Graphics and CAD Faculty of Mechanical Engineering Technion - Israel Inst. of Technol. Haifa 32000 Israel

3D scanners developed over the past several decades have facilitated the reconstruction of complicated engineering parts. Typically the boundary representation of a part is reconstructed from its scanned cloud of points. This approach, however, is still limited and cannot be applied to a family of objects such as thin parts. Recently, new 3D scanning devices have been developed. These devices capture additional information, such as normals and texture, as well as conventional information, including clouds of sampled points. This paper describes a new and fast reverse engineering method for creating a 3D computerized model from data captured by contemporary 3D scanning devices. The proposed method aggregates large-scale 3D scanned data into an extended Hierarchical Space Decomposition Model (HSDM) based on Octree data structure. This model can represent both an object's boundary surface and its interior volume. Based on the proposed volumetric model, the surface reconstruction process becomes more robust and stable with respect to sampling noise. The hierarchical structure of the proposed volumetric model enables data reduction, while preserving sharp geometrical features and object topology. As a result of data reduction, the execution time of the reconstruction process is significantly reduced. Moreover, the proposed model naturally allows multiresolution surface reconstruction, represented by a mesh with regular properties. The proposed surface reconstruction approach is based on extracting a Connectivity Graph from the extended HSDM and reconstructing facets based on normals data. The feasibility of the method will be demonstrated on a number of complex objects, including thin parts.

关键词： computer aided design

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