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2015 IEEE Pacific Visualization Symposium (PacificVis)最新文献

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Advanced lighting for unstructured-grid data visualization 用于非结构化网格数据可视化的高级照明
Pub Date : 2015-04-14 DOI: 10.1109/PACIFICVIS.2015.7156383
Min Shih, Yubo Zhang, K. Ma
The benefits of using advanced illumination models in volume visualization have been demonstrated by many researchers. Interactive volume rendering incorporated with advanced lighting has been achieved with GPU acceleration for regular-grid volume data, making volume visualization even more appealing as a tool for 3D data exploration. This paper presents an interactive illumination strategy, which is specially designed and optimized for volume visualization of unstructured-grid data. The basis of the design is a partial differential equation based illumination model to simulate the light propagation, absorption, and scattering within the volumetric medium. In particular, a two-level scheme is introduced to overcome the challenges presented by unstructured grids. Test results show that the added illumination effects such as global shadowing and multiple scattering not only lead to more visually pleasing visualization, but also greatly enhance the perception of the depth information and complex spatial relationships for features of interest in the volume data. This volume visualization enhancement is introduced at a time when unstructured grids are becoming increasingly popular for a variety of scientific simulation applications.
许多研究人员已经证明了在体可视化中使用先进的照明模型的好处。结合了先进照明的交互式体绘制已经通过GPU加速实现了规则网格体数据,使体可视化作为3D数据探索的工具更具吸引力。本文提出了一种针对非结构化网格数据体可视化而设计和优化的交互式照明策略。设计的基础是基于偏微分方程的照明模型来模拟光在体积介质中的传播、吸收和散射。特别地,引入了一种两级方案来克服非结构化网格带来的挑战。测试结果表明,加入全局阴影和多重散射等光照效果,不仅可以使可视化效果更加直观,而且可以大大增强体数据中感兴趣的特征的深度信息和复杂空间关系的感知。这种体积可视化增强是在非结构化网格在各种科学模拟应用中越来越流行的时候引入的。
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引用次数: 2
An uncertainty-driven approach to vortex analysis using oracle consensus and spatial proximity 使用oracle共识和空间接近性的不确定性驱动涡旋分析方法
Pub Date : 2015-04-14 DOI: 10.1109/PACIFICVIS.2015.7156381
Ayan Biswas, D. Thompson, Wenbin He, Qi Deng, Chun-Ming Chen, Han-Wei Shen, R. Machiraju, Anand Rangarajan
Although vortex analysis and detection have been extensively investigated in the past, none of the existing techniques are able to provide fully robust and reliable identification results. Local vortex detection methods are popular as they are efficient and easy to implement, and produce binary outputs based on a user-specified, hard threshold. However, vortices are global features, which present challenges for local detectors. On the other hand, global detectors are computationally intensive and require considerable user input. In this work, we propose a consensus-based uncertainty model and introduce spatial proximity to enhance vortex detection results obtained using point-based methods. We use four existing local vortex detectors and convert their outputs into fuzzy possibility values using a sigmoid-based soft-thresholding approach. We apply a majority voting scheme that enables us to identify candidate vortex regions with a higher degree of confidence. Then, we introduce spatial proximity- based analysis to discern the final vortical regions. Thus, by using spatial proximity coupled with fuzzy inputs, we propose a novel uncertainty analysis approach for vortex detection. We use expert's input to better estimate the system parameters and results from two real-world data sets demonstrate the efficacy of our method.
虽然涡旋分析和检测在过去已经得到了广泛的研究,但现有的技术都不能提供完全鲁棒和可靠的识别结果。局部涡旋检测方法很受欢迎,因为它们高效且易于实现,并且根据用户指定的硬阈值产生二进制输出。然而,涡旋是全局特征,这给局部探测器带来了挑战。另一方面,全局检测器是计算密集型的,需要大量的用户输入。在这项工作中,我们提出了一个基于共识的不确定性模型,并引入空间接近性来增强基于点的方法获得的涡流检测结果。我们使用四个现有的局部涡旋探测器,并使用基于s型的软阈值方法将它们的输出转换为模糊可能性值。我们采用多数投票方案,使我们能够以更高的置信度识别候选漩涡区域。然后,我们引入基于空间接近度的分析来识别最终的旋涡区域。因此,利用空间接近性和模糊输入相结合的方法,提出了一种新的涡检测不确定性分析方法。我们使用专家的输入来更好地估计系统参数,两个真实数据集的结果证明了我们的方法的有效性。
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引用次数: 16
SentiCompass: Interactive visualization for exploring and comparing the sentiments of time-varying twitter data SentiCompass:用于探索和比较时变twitter数据的情感的交互式可视化
Pub Date : 2015-04-14 DOI: 10.1109/PACIFICVIS.2015.7156368
F. Wang, A. Sallaberry, Karsten Klein, M. Takatsuka, Mathieu Roche
In this work, we introduce SentiCompass for exploring and comparing the sentiments of time-varying Twitter data. Our visualization design combines 2D psychology model of affect (i.e. emotion) with a time tunnel representation. To illustrate our visualization design, two case studies are conducted. They demonstrate the effectiveness of SentiCompass in achieving various tasks related to temporal sentiment and affective analysis of tweets. The interactive demo of our system is available at: http://youtu.be/ZaMF6VNO7tA.
在这项工作中,我们引入了SentiCompass来探索和比较时变Twitter数据的情绪。我们的可视化设计将情感(即情绪)的二维心理学模型与时间隧道表示相结合。为了说明我们的可视化设计,进行了两个案例研究。他们展示了SentiCompass在实现与tweet的时间情绪和情感分析相关的各种任务方面的有效性。我们的系统的交互式演示可在:http://youtu.be/ZaMF6VNO7tA。
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引用次数: 25
Text visualization techniques: Taxonomy, visual survey, and community insights 文本可视化技术:分类法、视觉调查和社区洞察
Pub Date : 2015-04-14 DOI: 10.1109/PACIFICVIS.2015.7156366
K. Kucher, A. Kerren
Text visualization has become a growing and increasingly important subfield of information visualization. Thus, it is getting harder for researchers to look for related work with specific tasks or visual metaphors in mind. In this paper, we present an interactive visual survey of text visualization techniques that can be used for the purposes of search for related work, introduction to the subfield and gaining insight into research trends. We describe the taxonomy used for categorization of text visualization techniques and compare it to approaches employed in several other surveys. Finally, we present results of analyses performed on the entries data.
文本可视化已经成为信息可视化的一个日益重要的分支领域。因此,研究人员越来越难以寻找具有特定任务或视觉隐喻的相关工作。在本文中,我们提出了文本可视化技术的交互式视觉调查,可用于搜索相关工作,介绍子领域和深入了解研究趋势的目的。我们描述了用于文本可视化技术分类的分类法,并将其与其他几个调查中采用的方法进行了比较。最后,我们提出了对条目数据进行分析的结果。
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引用次数: 185
Interactive streamline exploration and manipulation using deformation 互动流线探索和操作使用变形
Pub Date : 2015-04-14 DOI: 10.1109/PACIFICVIS.2015.7156349
Xin Tong, Chun-Ming Chen, Han-Wei Shen, P. C. Wong
Occlusion presents a major challenge in visualizing 3D flow fields using streamlines. Displaying too many streamlines creates a dense visualization filled with occluded structures, but displaying too few streams risks losing important features. A more ideal streamline exploration approach is to visually manipulate the cluttered streamlines by pulling visible layers apart and revealing the hidden structures underneath. This paper presents a customized deformation algorithm and an interactive visualization tool to minimize visual cluttering. The algorithm is able to maintain the overall integrity of the flow field and expose the previously hidden structures. Our system supports both mouse and direct-touch interactions to manipulate the viewing perspectives and visualize the streamlines in depth. By using a lens metaphor of different shapes to select the transition zone of the targeted area interactively, the users can move their focus and examine the flow field freely.
遮挡是使用流线可视化3D流场的主要挑战。显示太多的流线会产生密集的可视化,充满闭塞的结构,但显示太少的流线可能会失去重要的特征。更理想的流线探索方法是在视觉上操纵杂乱的流线,将可见的层分开,露出下面隐藏的结构。本文提出了一种自定义变形算法和一种交互式可视化工具,以最大限度地减少视觉杂乱。该算法能够保持流场的整体完整性,并将先前隐藏的结构暴露出来。我们的系统支持鼠标和直接触摸交互来操纵视角和可视化流线的深度。通过使用不同形状的透镜隐喻,交互式地选择目标区域的过渡区域,用户可以自由地移动焦点,观察流场。
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引用次数: 6
MetaTracts - A method for robust extraction and visualization of carbon fiber bundles in fiber reinforced composites MetaTracts。纤维增强复合材料中碳纤维束的鲁棒提取和可视化方法
Pub Date : 2015-04-14 DOI: 10.1109/PACIFICVIS.2015.7156377
Arindam Bhattacharya, C. Heinzl, A. Amirkhanov, J. Kastner, R. Wenger
This work introduces MetaTracts, a novel method for extracting and visualizing individual fiber bundles and weaving patterns from X-ray computed tomography (XCT) scans of endless carbon fiber reinforced polymers (CFRP). The proposed work flow is designed to analyze unit cells of CFRP materials integrating the recurring weaving pattern. It is designed to handle XCT scans of low resolution, in which individual fibers are not visible or are barely visible. First, a coarse version of integral curves is used to trace subsections of the individual fiber bundles in the woven CFRP materials. We call these sections MetaTracts. In the second step, these extracted fiber bundle sections (MetaTracts) are clustered using a two-step approach: first by orientation, then by proximity. The tool can generate volumetric representations as well as surface models of the extracted fiber bundles to be exported for further analysis. We evaluate the proposed work flow on a number of real world datasets and demonstrate that MetaTracts effectively and robustly identifies and separates different fiber bundles.
这项工作介绍了MetaTracts,一种从无尽碳纤维增强聚合物(CFRP)的x射线计算机断层扫描(XCT)中提取和可视化单个纤维束和编织图案的新方法。提出的工作流程旨在分析CFRP材料的单元格,并结合循环编织图案。它被设计用于处理低分辨率的XCT扫描,其中单个纤维不可见或几乎不可见。首先,使用粗版本的积分曲线来跟踪CFRP编织材料中单个纤维束的亚截面。我们称这些部分为元吸引。在第二步中,使用两步方法对这些提取的纤维束部分(MetaTracts)进行聚类:首先根据方向,然后根据接近度。该工具可以生成提取的纤维束的体积表示和表面模型,以便导出以进行进一步分析。我们在一些真实世界的数据集上评估了提议的工作流程,并证明了MetaTracts有效且稳健地识别和分离不同的光纤束。
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引用次数: 14
Moment invariants for 3D flow fields via normalization 归一化三维流场的矩不变量
Pub Date : 2015-04-14 DOI: 10.1109/PACIFICVIS.2015.7156350
R. Bujack, Jens Kasten, I. Hotz, G. Scheuermann, E. Hitzer
We generalize the framework of moments and introduce a definition of invariants for three-dimensional vector fields. To do so, we use the method of moment normalization that has been shown to be useful in the two dimensions. Using invariant moments, we show how to search for patterns in these fields independent from their position, orientation and scale. From the first order vector moment tensor, we construct a complete and independent set of descriptors. We test the invariants in queries on synthetic and real world flow fields.
我们推广了矩的框架,并引入了三维矢量场的不变量的定义。为此,我们使用力矩归一化方法,该方法已被证明在二维中是有用的。使用不变矩,我们展示了如何在这些领域中寻找独立于它们的位置、方向和规模的模式。从一阶矢量矩张量出发,构造了一个完整的、独立的描述子集。我们测试了合成流场和真实流场查询中的不变量。
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引用次数: 19
MultiStory: Visual analytics of dynamic multi-relational networks 多层:动态多关系网络的可视化分析
Pub Date : 2015-04-14 DOI: 10.1109/PACIFICVIS.2015.7156359
A. Meidiana, Seok-Hee Hong
Modern-day social networks are often dynamic and multi-relational, however there is currently little being studied on how to incorporate both aspects simultaneously to support visual analytic tasks for such complex social networks. We present a visual analytic framework for dynamic multi-relational networks and a prototype implementation, called the MultiStory system, which includes two new visualisation methods, AlterCluster and InterArc, designed for dynamic networks with multiple relations. The system is evaluated with two case studies using social networks from the MIT Reality Commons to demonstrate the effectiveness of the system to support a variety of visual analytical tasks on dynamic multi-relational networks.
现代社会网络通常是动态的和多关系的,然而目前很少有人研究如何同时结合这两个方面来支持如此复杂的社会网络的可视化分析任务。我们提出了一个动态多关系网络的可视化分析框架和一个原型实现,称为MultiStory系统,其中包括两种新的可视化方法,AlterCluster和InterArc,专为具有多关系的动态网络设计。该系统通过使用麻省理工学院现实共享网络的两个案例研究进行评估,以证明该系统在支持动态多关系网络上各种视觉分析任务方面的有效性。
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引用次数: 6
SketchInsight: Natural data exploration on interactive whiteboards leveraging pen and touch interaction SketchInsight:利用笔和触摸交互在交互式白板上进行自然数据探索
Pub Date : 2015-04-14 DOI: 10.1109/PACIFICVIS.2015.7156378
Bongshin Lee, Greg Smith, N. Riche, Amy K. Karlson, Sheelagh Carpendale
In this work, we advance research efforts in combining the casual sketching approach of whiteboards with the machine's computing power. We present SketchInsight, a system that applies the familiar and collaborative features of a whiteboard interface to the accurate data exploration capabilities of interactive visualizations. SketchInsight enables data analysis with more fluid interaction, allowing people to visually explore their data by drawing simple charts and directly manipulating them. In addition, we report results from a qualitative study conducted to evaluate user experience in exploring data with SketchInsight, expanding our understanding on how people use a pen- and touch-enabled digital whiteboard for data exploration. We also discuss the challenges in building a working system that supports data analytic capabilities with pen and touch interaction and freeform annotation.
在这项工作中,我们推进了将白板的随意素描方法与机器的计算能力相结合的研究工作。我们介绍了SketchInsight,一个将白板界面的熟悉和协作特性应用于交互式可视化的精确数据探索功能的系统。SketchInsight使数据分析具有更流畅的交互,允许人们通过绘制简单的图表并直接操作它们来直观地探索数据。此外,我们报告了一项定性研究的结果,该研究旨在评估使用SketchInsight探索数据的用户体验,扩展了我们对人们如何使用笔和触摸功能的数字白板进行数据探索的理解。我们还讨论了构建一个支持数据分析功能的工作系统所面临的挑战,该系统具有笔和触摸交互以及自由格式注释。
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引用次数: 42
Distance between extremum graphs 极值图之间的距离
Pub Date : 2015-04-14 DOI: 10.1109/PACIFICVIS.2015.7156386
V. Narayanan, Dilip Mathew Thomas, V. Natarajan
Scientific phenomena are often studied through collections of related scalar fields generated from different observations of the same phenomenon. Exploration of such data requires a robust distance measure to compare scalar fields for tasks such as identifying key events and establishing correspondence between features in the data. Towards this goal, we propose a topological data structure called the complete extremum graph and define a distance measure on it for comparing scalar fields in a feature-aware manner. We design an algorithm for computing the distance and show its applications in analysing time varying data.
科学现象通常是通过对同一现象的不同观测产生的相关标量场的集合来研究的。对这些数据的探索需要一个强大的距离度量来比较标量字段,以完成诸如识别关键事件和建立数据中特征之间的对应关系等任务。为了实现这一目标,我们提出了一种称为完全极值图的拓扑数据结构,并在其上定义了一个距离度量,用于以特征感知的方式比较标量场。我们设计了一种计算距离的算法,并展示了它在时变数据分析中的应用。
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引用次数: 30
期刊
2015 IEEE Pacific Visualization Symposium (PacificVis)
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