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15th Design Automation Conference, DAC 1978

作者： Baer, Adrian E. New Jersey Institute of Technology Department of Computer and Information Science Interactive Graphics Laboratory NewarkNJ07102 United States

A method is discussed for combining flexibility in defining 3-dimensional geometric shape with system maintained integrity. Such capabilities allow the user to concentrate on local considerations in modifying design databases in an interactive environment. © 2017 Institute of Electrical and Electronics Engineers Inc. All rights reserved.

关键词： computer aided design

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Robust reconstruction of curved line structures in noisy point clouds

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Visual Informatics 2021年第3期5卷 1-14页

作者： Marcel Ritter Daniel Schiffner Matthias Harders Interactive Graphics and Simulation Group Department of Computer ScienceUniversity of InnsbruckAustria Airborne Hydromapping GmbH InnsbruckAustria DIPF|Leibniz Institute for Research and Information Education FrankfurtGermany

Point-based geometry representations have become widely used in numerous contexts,ranging from particle-based simulations,over stereo image matching,to depth sensing via light detection and *** application focus is on the reconstruction of curved line structures in noisy 3D point cloud *** algorithms operating on such point clouds often rely on the notion of a local *** the latter,our approach employs multi-scale neighborhoods,for which weighted covariance measures of local points are *** line structures are reconstructed via vector field tracing,using a bidirectional piecewise streamline *** also introduce an automatic selection of optimal starting points via multi-scale geometric *** pipeline development and choice of parameters was driven by an extensive,automated initial analysis process on over a million prototype test *** behavior of our approach is controlled by several parameters—the majority being set automatically,leaving only three to be controlled by a *** an extensive,automated final evaluation,we cover over one hundred thousand parameter sets,including 3D test geometries with varying curvature,sharp corners,intersections,data holes,and systematically applied varying types of ***,we analyzed different choices for the point of reference in the co-variance computation;using a weighted mean performed best in most *** addition,we compared our method to current,publicly available line reconstruction *** to thirty times faster execution times were achieved in some cases,at comparable error ***,we also demonstrate an exemplary application on four real-world 3D light detection and ranging datasets,extracting power line cables.

关键词： Computational geometry Noisy point clouds Line reconstruction Automatic Adaptive control

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Motion planning for redundant branching articulated figures with many degrees of freedom

Motion planning for redundant branching articulated figures ...

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1992 IEEE/RSJ International Conference on Intelligent Robots and Systems, IROS 1992

作者： Ching, Wallace S. Badler, Norman I. Computer Graphics Research Laboratory Department of Computer and Information Science University of Pennsylvania PhiladelphiaPA19104 6389 United States

ISBN: (纸本)0780307372

A fast algorithm is presented that can handle the motion planning problem for articulated figures with branches and many degrees of freedom. The algorithm breaks down the degrees of freedom of the figure into Cspace groups and compute the free motion for each of these groups in a sequential fashion. It traverses the tree in a deptn first order to compute the motion for all the branches. A special playback routine is then used to traverse the tree again in a reverse order to playback the final motion. The planner runs in linear time with respect to the total number of Cspace groups without backtracking. We believe that the planner would find a path in most cases and is fast enough for practical use in a wide range of applications. © 1992 IEEE. All rights reserved.

关键词： Motion planning

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interactive real-time articulated figure manipulation using multiple kinematic constraints 90

Interactive real-time articulated figure manipulation using ...

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1990 Symposium on interactive 3D graphics, I3D 1990

作者： Phillips, Cary B. Zhao, Jianmin Badler, Norman I. Computer Graphics Research Laboratory Department of Computer and Information Science University of Pennsylvania PhiladelphiaPA19104-0389 United States

ISBN: (纸本)0897913515

In this paper, we describe an interactive system for positioning articulated figures which uses a 3D direct manipulation technique to provide input to an inverse kinematics algorithm running in real time. The system allows the user to manipulate highly articulated figures, such as human figure models, by interactively dragging 3D "reach goals." The user may also define multiple "reach constraints" which are enforced during the manipulation. The 3D direct manipulation interface provides a good mechanism for control of the inverse kinematics algorithm and helps it to overcome problems with redundancies and singularities which occur with figures of many degrees of freedom. We use an adaptive technique for evaluating the constraints which allows us to ensure that only a certain user-controllable amount of time will be consumed by the inverse kinematics algorithm at each iteration of the manipulation process. This technique is also sensitive to the time it takes to redraw the screen, so it prevents the frame display rate of the direct manipulation from become too slow for interactive control, © 1990 ACM.

关键词： Degrees of freedom (mechanics)

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interactive behaviors for bipedal articulated figures 91

Interactive behaviors for bipedal articulated figures

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18th Annual Conference on computer graphics and interactive Techniques, SIGGRAPH 1991

作者： Phillips, Cary B. Badler, Norman I. Computer Graphics Research Laboratory Department of Computer and Information Science University of Pennsylvania PhiladelphiaPA19104-6389 United States

ISBN: (纸本)0897914368

We describe techniques for interactively controlling bipedal articulated figures through kinematic constraints. These constraints model certain behavioral tendencies which capture some of the characteristics of human-like movement, and give us control over such elements as the figures' balance and stability. They operate in near real-time, so provide behavioral control for interactive manipulation. These constraints form the basis of an interactive motion-generation system that allows the active movement elements to be layered on top of the passive behavioral constraints. © 1991 ACM.

关键词： Inverse kinematics

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An approach for robot-assisted biosensing: Demonstration with MRI-guided MR spectroscopy

An approach for robot-assisted biosensing: Demonstration wit...

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10th IEEE International Workshop on Biomedical Engineering, BioEng 2011

作者： Sonmez, Ahmet E. Hedayati, Yousef Webb, Andrew G. Deng, Zhigang Navkar, Nikhil Tsekos, Nikolaos V. Medical Robotics Laboratory Department of Computer Science University of Houston Houston TX 77204 United States Computer Graphics and Interactive Media Laboratory Department of Computer Science University of Houston Houston TX 77204 United States Department of Radiology Leiden University Medical Centre Leiden Netherlands

ISBN: (纸本)9781457705526

Emerging and established methods, such as optical imaging and MR spectroscopy (MRS), offer new opportunities for in situ biosensing. The limited tissue penetration of these modalities can be addressed by locally placing the sensor via minimally invasive trans-needle or trans-catheter access. This work introduces a generic system that mechanically scans an area of interest with a sensor, capable of generating 1D scans while registering them to a guiding modality. computer simulations illustrate the operation of this approach for a miniature RF coil as the mechanically scanned biosensor. Experimental studies demonstrated the approach on phantoms, using MRI as the guiding modality, and an MR-compatible manipulator, which carried a miniature RF coil, was used to scan and collect MRS and generated 1D MRS scans co-registered to the guiding MRI. © 2011 IEEE.

关键词： Robotics

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Shifting from "high fidelity" to "low fidelity" algorithm visualization technology

Shifting from "high fidelity" to "low fidelity" algorithm vi...

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Conference on Human Factors in Computing Systems, CHI EA 2000

作者： Hundhausen, Christopher Douglas, Sarah Information and Computer Sciences Department Laboratory for Interactive Learning Technologies University of Hawari Honolulu HI 96822 United States Computer and Information Science Department Human-Computer Interaction Lab University of Oregon Eugene OR United States

ISBN: (纸本)1581132484

Traditional algorithm visualization software supports the creation of "high fidelity" visualizations, which depict the target algorithm for arbitrary input, and have the polished look of textbook figures. Drawing on the findings of ethnographic studies we conducted in an undergraduate algorithms course, we have developed SALSA/ALVIS, a markedly different kind of algorithm visualization software that enables students to construct and present their own "low fidelity" visualizations. Unlike "high fidelity" visualizations, "low fidelity" visualizations depict the target algorithm for a few, carefully-selected input data sets, and have an unpolished look. In addition, they can be viewed both forwards and backwards, and dynamically marked up and modified, making them well-suited for mediating studentinstructor discussions about algorithms. Copyright © 2012 ACM, Inc.

关键词： Visualization

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Maintaining Integrity in Complex Shape Definitions 78

Maintaining Integrity in Complex Shape Definitions

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Design Automation Conference

作者： A.E. Baer Department of Computer and Information Science Interactive Graphics Laboratory New Jersey Institute of Technology Newark NJ USA

A method is discussed for combining flexibility in defining 3-dimensional geometric shape with system maintained integrity. Such capabilities allow the user to concentrate in modifying design databases in an interacti... 详细信息

关键词： Shape Solid modeling Spatial databases information science computer graphics Laboratories Sheet materials Stress Structural engineering Automotive engineering

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Visual Analysis of Point Cloud Neighborhoods via Multi-Scale Geometric Measures

Visual Analysis of Point Cloud Neighborhoods via Multi-Scale...

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42nd Annual Conference on European Association for computer graphics, EUROgraphics 2021

作者： Ritter, M. Schiffner, D. Harders, M. Interactive Graphics and Simulation Group The Department of Computer Science University of Innsbruck Austria DIPF Leibniz Institute for Research and Information Education Frankfurt Germany Airborne Hydromapping GmbH Innsbruck Austria

ISBN: (纸本)9783038681335

Point sets are a widely used spatial data structure in computational and observational domains, e.g. in physics particle simulations, computer graphics or remote sensing. Algorithms typically operate in local neighborhoods of point sets, for computing physical states, surface reconstructions, etc. We present a visualization technique based on multi-scale geometric features of such point clouds. We explore properties of different choices on the underlying weighted co-variance neighborhood descriptor, illustrated on different point set geometries and for varying noise levels. The impact of different weighting functions and tensor centroids, as well as point set features and noise levels becomes visible in the rotation-invariant feature images. We compare to a curvature based scale space visualization method and, finally, show how features in real-world LiDAR data can be inspected by images created with our approach in an interactive tool. In contrast to the curvature based approach, with our method line structures are highlighted over growing scales, with clear border regions to planar or spherical geometric structures. © 2021 The Author(s).

关键词： Data visualization

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On the problem of determination of spring stiffness parameters for spring-mesh models

On the problem of determination of spring stiffness paramete...

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Medicine Meets Virtual Reality 16 - Parallel, Combinatorial, Convergent: NextMed by Design, MMVR 2008

作者： Quang Huy Viet, Huynh Hirai, Shinichi Shirai, Yoshiaki Yamaguchi, Satoshi Tanaka, Hiromi T. Kawasaki, Hiroshi Kawai, Yukiko Computer Vision and Graphics Laboratory Department of Information and Computer Science Saitama University Saitama Japan Laboratory for Integrated Machine Intelligence Department of Robotics Ritsumeikan University Kusatsu Japan Computer Vision Lab. Department of Human and Computer Intelligence Ritsumeikan University Kusatsu Japan Kawai Lab. Department of Computer Science Kyoto Sangyo University Kyoto Japan

ISBN: (纸本)9781586038229

On account of having real-time behavior and being easy to implement, spring meshes have been used for modeling deformable objects. Determining spring stiffness parameters for simulation of soft objects with high accuracy still remains a challenge. Allen Van Gelder derived an approximate formula for determining spring stiffness parameters based on strain analysis. Even though the experimental result showed the effectiveness, the method has not been investigated from a quantitative point of view. In this paper we propose a quantitative method for determining spring stiffness parameters. Moreover we propose a method to improve the accuracy by way of introducing torsional spring into the conventional spring mesh model. © 2008 The authors. All rights reserved.

关键词： Stiffness matrix

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