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International Conference on Image and graphics

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

ISBN: (纸本)9780769545417

A virtual reality (VR) based training system for Minimally Invasive Vascular Surgery can be a very useful training tool for improving skills and reducing errors in operation. computer vision techniques have the potential to be incorporated into a VR based training system for developing low cost, high accuracy and flexible systems in this area. In this paper, we present an interactive 3D training system that uses stereo vision to capture hand movements as the input operations for the system. The standard operations i.e. pushing, pulling and twisting are captured with stereo vision based on the improved Camshift tracking algorithm and parallel alignment model theory to acquire hand gestures information. We present a new approach to calculate virtual pushing/pulling force and turning angle as extra inputs for understanding these essential operations. In addition, an algorithm that enables the simulator to model guidewire and catheter insertions realistically is presented through these basic actions. The experiment results demonstrate that stereo vision based training system is useful and effective for simulating guidewire insertion procedures with low system cost and flexible operations. © 2011 IEEE.

关键词： Stereo vision

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Real-time slicing of data space 96

Real-time slicing of data space

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IEEE Conference on Visualization

作者： R.A. Crawfis Ohio State Uinversity Columbus OH USA Lawrence Livemore National Laboratory Livermore CA USA

ISBN: (纸本)9780897918640

Real time rendering of iso contour surfaces is problematic for large complex data sets. An algorithm is presented that allows very rapid representation of an interval set surrounding an iso contour surface. The algorithm draws upon three main ideas. A fast indexing scheme is used to select only those data points near the contour surface. Hardware assisted splatting is then employed on these data points to produce a volume rendering of the interval set. Finally, by shifting a small window through the indexing scheme or data space, animated volumes are produced showing the changing contour values. In addition to allowing fast selection and rendering of the data, the indexing scheme allows a much compressed representation of the data by eliminating "noise" data points.

关键词： Indexing Animation Rendering (computer graphics) Laboratories Hardware Isosurfaces Rough surfaces Surface roughness Transfer functions Data visualization

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Biomedical Simulation 1

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丛书名： Lecture Notes in computer Science

1000年

作者： Fernando Bello Stéphane Cotin

ISBN: (数字)9783319120577

ISBN: (纸本)9783319120560

This book constitutes the thoroughly refereed conference proceedings of the 6th International Symposium on Biomedical Simulation (ISBMS) which was held in Strasbourg, France, in October 2014. Biomedical modeling and simulation are at the center stage of worldwide efforts to understand and replicate the behavior and function of the human organism. Large scale initiatives such as the Physiome Project, Virtual Physiological Human and Blue Brain Project aim to develop advanced computational models that will facilitate the understanding of the integrative function of cells, organs, and organisms, with the ultimate goal of delivering truly personalized medicine. At the same time, progress in modeling, numerical techniques and haptics has enabled more complex and interactive simulations. The 27 revised full papers (including 16 regular and 11 short papers) were carefully selected from 45 submissions and cover topics such as training systems and haptics, physics-based registration, vascular modeling and simulation, image and simulation, modeling, surgical planning, analysis, characterization and validation.

关键词： Simulation and Modeling Image Processing and computer Vision computer graphics Computational Biology/Bioinformatics Health Informatics Imaging / Radiology

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interactive visualization of fluid dynamics simulations in locally refined cartesian grids

Proceedings of the IEEE Visualization Conference

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proceedings of the IEEE Visualization Conference 1999年 413-416页

作者： Schulz, Martin Reck, Frank Bartelheimer, Wolf Ertl, Thomas Univ of Stuttgart Stuttgart Germany

This work presents interactive flow visualization techniques specifically adapted for PowerFLOWTM, a lattice-based CFD code from the EXA corporation. Their Digital PhysicsTM fluid simulation technique is performed on a hierarchy of locally refined cartesian grids with a fine voxel resolution in areas of interesting flow features. Among other applications the PowerFLOW solver is used for aerodynamic simulations in car body development where the advantages of automatic grid generation from CAD models is of great interest. In a joint project with BMW and EXA we are developing a visualization tool which incorporates virtual reality techniques for the interactive exploration of the large scalar and vector data sets. In this paper we describe the specific data structures and interpolation techniques and we report on fast particle tracing taking into account collisions with the car body geometry. An OpenGL Optimizer based implementation allows for the inspection of the flow with particle probes and slice probes at interactive frame rates.

关键词： interactive computer graphics

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3D character animation synthesis from 2D sketches

Proceedings - GRAPHITE 2006: 4th International Conference on...

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proceedings - GRAPHITE 2006: 4th International Conference on computer graphics and interactive techniques in Australasia and Southeast Asia 2006年 93-96页

作者： Lin, Yi University of Waterloo

ISBN: (纸本)1595935649

Traditional character animation has superiority in conveying stylized information about characters and events, but producing it requires a lot of labor and time. computer generated animation improves greatly on efficiency, but is poor in expressing stylized motion. In this paper, we propose a sketching-based animation synthesis system. The system contains an interface for the user to draw the sketches or load sketch images. Then the system extracts 2D pose from the input strokes and maps the 2D pose to 3D pose that is in a motion capture database. During the mapping, a series of matching 3D pose candidates are found. The user can select the most satisfying candidate as the 3D key pose for the later animation synthesis. The system synthesizes an animation based on the 3D key poses by finding a path in the motion capture database and generating transition motions if needed.

关键词： Three dimensional computer graphics

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Lifestreams: A modular sense-making toolset for identifying important patterns from everyday life 13

Lifestreams: A modular sense-making toolset for identifying ...

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11th acm Conference on Embedded Networked Sensor Systems, SenSys 2013

作者： Hsieh, Cheng-Kang Tangmunarunkit, Hongsuda Alquaddoomi, Faisal Jenkins, John Kang, Jinha Ketcham, Cameron Longstaff, Brent Selsky, Joshua Dawson, Betta Swendeman, Dallas Estrin, Deborah Ramanathan, Nithya UCLA Computer Science Department United States Cornell Tech United States UCLA Global Center for Children and Families United States UCLA David Geffen School of Medicine Department of Psychiatry and Biobehavioral Sciences United States Nexleaf Analytics United States

ISBN: (纸本)9781450320276

Smartphones can capture diverse spatio-temporal data about an individual;including both intermittent self-report, and continuous passive data collection from onboard sensors and applications. The resulting personal data streams can support powerful inference about the user's state, behavior, well-being and environment. However making sense and acting on these multi-dimensional, heterogeneous data streams requires iterative and intensive exploration of the datasets, and development of customized analysis techniques that are appropriate for a particular health domain. Lifestreams is a modular and extensible open-source data analysis stack designed to facilitate the exploration and evaluation of personal data stream sense-making. Lifestreams analysis modules include: feature extraction from raw data;feature selection;pattern and trend inference;and interactive visualization. The system was iteratively designed during a 6-month pilot in which 44 young mothers used an open-source participatory mHealth plat form to record both self-report and passive data about their diet, stress and exercise. Feedback as participants and the study coordinator attempted to use the Lifestreams dashboard to make sense of their data collected during this intensive study were critical inputs into the design process. In order to explore the generality and extensibility of Lifestreams pipeline, it was then applied to two additional studies with different datasets, including a continuous stream of audio data, self-report data, and mobile system analytics. In all three studies, Lifestreams' integrated analysis pipeline was able to identify key behaviors and trends in the data that were not otherwise identified by participants.

关键词： mHealth

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Modeling expressive wrinkle on human face

Proceedings - GRAPHITE 2006: 4th International Conference on...

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proceedings - GRAPHITE 2006: 4th International Conference on computer graphics and interactive techniques in Australasia and Southeast Asia 2006年 425-427页

作者： Azmi, Nurazlin Zainal Wirza, Rahmita Mahmod, Ramlan Universiti Putra Malaysia Selangor Malaysia

ISBN: (纸本)1595935649

Wrinkles are important for realistic facial animation and modeling because they aid in recognizing human's expressions as well as person's age. Different techniques have been used to generate wrinkles, whether it is fine-scale or large-scale wrinkles. This paper presents a technique on modeling large-scale wrinkles, also known as the expressive wrinkle, on human face by using points instead of triangular meshes. The wrinkle will be modeled on a drawing basis, where users can see the effect directly once the shape and location of the wrinkle has been specified on the 3D face mesh itself. After that, the data involved in modeling the wrinkle are retrieved and processed. A new wrinkle shape function will be introduced to capture the realism of the wrinkle generated where it will be applied during the process.

关键词： Human computer interaction

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interactive Modeling of Environmental Impacts

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IFAC proceedings Volumes 1990年第8期23卷 521-527页

作者： K. Fedra Admnced Computer Applications Project International Institute for Applied Systems Analysis (IIASA) A-2361 Laxenburg Austria

Human activities, and in particular large scale industrial, energy, construction, water resources, or agricultural projects considerably affect the natural environment. Concern about these impacts and their immediate as well as long-term consequences makes the prediction and analysis of environmental impacts an important field of research. Among the most important tools for the prediction and analysis of these environmental impacts are various types of models. Numerical or symbolic simulation models implemented on computers, provide powerful and versatile tools for the assessment of potential environmental impacts for complex dynamic and spatially distributed systems. Designed to describe and simulate future impacts that are obviously not yet observable, models can also operate in data-poor situations, analyzing scenarios of sets of plausible assumptions. To assist in such numerical experimentation, models are built into interactive frameworks, coupled to various data bases that provide input data and parameter information, pre- and post-processors that help to design plausible and consistent simulation experiments and analyze them. Visualization of dynamic and spatially distributed processes in the form of animated computer graphics, and immediate response to what-if questions in a dialog-oriented interface are important elements of effective simulation modeling. In data-poor situations, models are useful for stimulating insight and intuitive understanding of complex patterns rather than providing exact answers. Insight into environmental relationships is supported by directly understandable, symbolic and graphical ways of presenting model results and, in general, by a conversational, interactive and symbolic approach to simulation modeling. The use of models, and in particular, of interactive simulation and optimization models that combine traditional modeling approaches with new techniques of Artificial Intelligence (AI) and dynamic computer graphics, is demonstr

关键词： computer graphics environmental impacts expert systems model reduction simulation system analysis

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Introduction to computer graphics and Ray-Tracing Using the WebGPU API 22

Introduction to Computer Graphics and Ray-Tracing Using the ...

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SIGGRAPH Asia 2022 Courses

作者： Soon Ki Jung Kyungpook National University

ISBN: (纸本)9781450394741

The purpose of this course is to introduce computer graphics concepts (in a ray-tracing environment) using the WebGPU API (WGSL language). The course explains both the theoretical aspects while demonstrating them through practical examples. The course uses the WebGPU API to implement examples in an accessible web-based environment so learners can actively run/experiment with programs in real-time as they go through the material. The course provides a comprehensive set of notes in addition to a range of online resources which can be used as a springboard for further projects.

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Visualizing simulated room fires 99

Visualizing simulated room fires

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IEEE Conference on Visualization

作者： J. Govindarajan M. Ward J. Barnett Worcester Polytechnic Institute Worcester MA US

ISBN: (纸本)9780780358973

Recent advances in fire science and computer modeling of fires allow scientists to predict fire growth and spread through structures. In this paper we describe a variety of visualizations of simulated room fires for use by both fire protection engineers and fire suppression personnel. We also introduce the concept of fuzzy visualization, which results from the superposition of data from several separate simulations into a single visualization.

关键词： Fires Predictive models Computational fluid dynamics Data visualization Computational modeling computer science Protection Fluid flow Extraterrestrial phenomena Analytical models

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