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IEEE Transactions on Visualization and Computer Graphics

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https://www.readbyqxmd.com/read/28422685/outdoor-markerless-motion-capture-with-sparse-handheld-video-cameras
#1
Yangang Wang, Yebin Liu, Xin Tong, Qionghai Dai, Ping Tan
We present a method for outdoor markerless motion capture with sparse handheld video cameras. In the simplest setting, it only involves two mobile phone cameras following the character. This setup can maximize the flexibilities of data capture and broaden the applications of motion capture. To solve the character pose under such challenge settings, we exploit the generative motion capture methods and propose a novel model-view consistency that considers both foreground and background in the tracking stage. The background is modeled as a deformable 2D grid, which allows us to compute the background-view consistency for sparse moving cameras...
April 12, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28422684/visual-analysis-of-inclusion-dynamics-in-two-phase-flow
#2
Grzegorz Karch, Fabian Beck, Moritz Ertl, Christian Meister, Kathrin Schulte, Bernhard Weigand, Thomas Ertl, Filip Sadlo
In single-phase flow visualization, research focuses on the analysis of vector field properties. In two-phase flow, in contrast, analysis of the phase components is typically of major interest. So far, visualization research of two-phase flow concentrated on proper interface reconstruction and the analysis thereof. In this paper, we present a novel visualization technique that enables the investigation of complex two-phase flow phenomena with respect to the physics of breakup and coalescence of inclusions. On the one hand, we adapt dimensionless quantities for a localized analysis of phase instability and breakup, and provide detailed inspection of breakup dynamics with emphasis on oscillation and its interplay with rotational motion...
April 12, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28391198/the-discriminative-power-of-shape-an-empirical-study-in-time-series-matching
#3
Kaustubha Mendhurwar, Qing Gu, Sudhir Mudur, Tiberiu Popa
Shape provides significant discriminating power in time series matching of visual or geometric data as required in many important applications in graphics and vision. The well established dynamic time warping (DTW) algorithm and its variants do this matching by determining a non-linear time mapping to minimise Euclidean distances between corresponding time-warped points. However the shape of curves is not considered. In this paper, we present a new shape-aware algorithm which uses time and shape correspondence (TSC) at increasing levels of detail to define a similarity measure with an L0 norm to aggregate the results, making it robust to noise and missing data...
April 5, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28391197/virtual-character-animation-based-on-affordable-motion-capture-and-reconfigurable-tangible-interfaces
#4
Fabrizio Lamberti, Gianluca Paravati, Valentina Gatteschi, Alberto Cannavo, Paolo Montuschi
Software for computer animation is generally characterized by a steep learning curve, due to the entanglement of both sophisticated techniques and interaction methods required to control 3D geometries. This paper proposes a tool designed to support computer animation production processes by leveraging the affordances offered by articulated tangible user interfaces and motion capture retargeting solutions. To this aim, orientations of an instrumented prop are recorded together with animator's motion in the 3D space and used to quickly pose characters in the virtual environment...
April 3, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28371779/dynamic-path-exploration-on-mobile-devices
#5
Michael Birsak, Przemyslaw Musialski, Peter Wonka, Michael Wimmer
We present a novel framework for visualizing routes on mobile devices. Our framework is suitable for helping users explore their environment. First, given a starting point and a maximum route length, the system retrieves nearby points of interest (POIs). Second, we automatically compute an attractive walking path through the environment trying to pass by as many highly ranked POIs as possible. Third, we automatically compute a route visualization that shows the current user position, POI locations via pins, and detail lenses for more information about the POIs...
March 31, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28368822/sculpting-mountains-interactive-terrain-modeling-based-on-subsurface-geology
#6
Guillaume Cordonnier, Marie-Paule Cani, Bedrich Benes, Jean Braun, Eric Galin
Most mountain ranges are formed by the compression and folding of colliding tectonic plates. Subduction of one plate causes large-scale asymmetry while their layered composition (or stratigraphy) explains the multi-scale folded strata observed on real terrains. We introduce a novel interactive modeling technique to generate visually plausible, large scale terrains that capture these phenomena. Our method draws on both geological knowledge for consistency and on sculpting systems for user interaction. The user is provided hands-on control on the shape and motion of tectonic plates, represented using a new geologically-inspired model for the Earth crust...
March 29, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28368821/drawing-large-graphs-by-multilevel-maxent-stress-optimization
#7
Henning Meyerhenke, Martin Nollenburg, Christian Schulz
Drawing large graphs appropriately is an important step for the visual analysis of data from real-world networks. Here we present a novel multilevel algorithm to compute a graph layout with respect to the maxent-stress metric proposed by Gansner et al. (2013) that combines layout stress and entropy. As opposed to previous work, we do not solve the resulting linear systems of the maxent-stress metric with a typical numerical solver. Instead we use a simple local iterative scheme within a multilevel approach...
March 29, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28368820/robust-non-rigid-motion-tracking-and-surface-reconstruction-using-l-0-regularization
#8
Kaiwen Guo, Feng Xu, Yangang Wang, Yebin Liu, Qionghai Dai
We present a new motion tracking technique to robustly reconstruct non-rigid geometries and motions from a single view depth input recorded by a consumer depth sensor. The idea is based on the observation that most non-rigid motions (especially human-related motions) are intrinsically involved in articulate motion subspace. To take this advantage, we propose a novel L0 based motion regularizer with an iterative solver that implicitly constrains local deformations with articulate structures, leading to reduced solution space and physical plausible deformations...
March 28, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28320668/petminer-a-visual-analysis-tool-for-petrophysical-properties-of-core-sample-data
#9
Dave G Harrison, Nick D Efford, Quentin J Fisher, Roy A Ruddle
The aim of the PETMiner software is to reduce the time and monetary cost of analysing petrophysical data that is obtained from reservoir sample cores. Analysis of these data requires tacit knowledge to fill 'gaps' so that predictions can be made for incomplete data. Through discussions with 30 industry and academic specialists, we identified three analysis use cases that exemplified the limitations of current petrophysics analysis tools. We used those use cases to develop nine core requirements for PETMiner, which is innovative because of its ability to display detailed images of the samples as data points, directly plot multiple sample properties and derived measures for comparison, and substantially reduce interaction cost...
March 15, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28362588/evaluating-interactive-graphical-encodings-for-data-visualization
#10
Bahador Saket, Arjun Srinivasan, Eric D Ragan, Alex Endert
User interfaces for data visualization often consist of two main components: control panels for user interaction and visual representation. A recent trend in visualization is directly embedding user interaction into the visual representations. For example, instead of using control panels to adjust visualization parameters, users can directly adjust basic graphical encodings (e.g., changing distances between points in a scatterplot) to perform similar parameterizations. However, enabling embedded interactions for data visualization requires a strong understanding of how user interactions influence the ability to accurately control and perceive graphical encodings...
March 9, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28278471/a-geometric-model-for-specularity-prediction-on-planar-surfaces-with-multiple-light-sources
#11
Alexandre Morgand, Mohamed Tamaazousti, Adrien Bartoli
Specularities are often problematic in computer vision since they impact the dynamic range of the image intensity. A natural approach would be to predict and discard them using computer graphics models. However, these models depend on parameters which are difficult to estimate (light sources, objects' material properties and camera). We present a geometric model called JOLIMAS: JOint LIght-MAterial Specularity, which predicts the shape of specularities. JOLIMAS is reconstructed from images of specularities observed on a planar surface...
March 2, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28287975/rendering-rough-opaque-materials-with-interfaced-lambertian-microfacets
#12
Daniel Meneveaux, Benjamin Bringier, Emmanuelle Tauzia, Mickael Ribardiere, Lionel Simonot
Specular microfacet distributions have been successfully employed by many authors for representing glossiness of materials. They are generally combined with a Lambertian term to account for the colored aspect. These representations make use of the Fresnel reflectance factor at the interface, but the transmission factor at the interface should also be managed. One solution is to employ a multi-layered model with a single layer for the rough interface, which requires a numerical simulation for handling the multiple reflections of light between the substrate and the interface...
March 1, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28278470/a-context-aware-method-for-authentically-simulating-outdoors-shadows-for-mobile-augmented-reality
#13
Joao Barreira, Maximino Bessa, Luis Barbosa, Luis Magalhaes
Visual coherence between virtual and real objects is a major issue in creating convincing augmented reality (AR) applications. To achieve this seamless integration, actual light conditions must be determined in real time to ensure that virtual objects are correctly illuminated and cast consistent shadows. In this paper, we propose a novel method to estimate daylight illumination and use this information in outdoor AR applications to render virtual objects with coherent shadows. The illumination parameters are acquired in real time from context-aware live sensor data...
March 1, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28252408/proxy-graph-visual-quality-metrics-of-big-graph-sampling
#14
Quan-Hoang Nguyen, Seok-Hee Hong, Peter Eades, Amyra Meidiana
Data sampling has been extensively studied for large scale graph mining. Many analyses and tasks become more efficient when performed on graph samples of much smaller size. The use of proxy objects is common in software engineering for analysis and interaction with heavy objects or systems. In this paper, we coin the term 'proxy graph' and empirically investigate how well a proxy graph visualization can represent a big graph. Our investigation focuses on proxy graphs obtained by sampling; this is one of the most common proxy approaches...
February 24, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28252407/towards-perceptual-optimization-of-the-visual-design-of-scatterplots
#15
Luana Micallef, Gregorio Palmas, Antti Oulasvirta, Tino Weinkauf
Designing a good scatterplot can be difficult for non-experts in visualization, because they need to decide on many parameters, such as marker size and opacity, aspect ratio, color, and rendering order. This paper contributes to research exploring the use of perceptual models and quality metrics to set such parameters automatically for enhanced visual quality of a scatterplot. A key consideration in this paper is the construction of a cost function to capture several relevant aspects of the human visual system, examining a scatterplot design for some data analysis task...
February 24, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28252406/word-sized-graphics-for-scientific-texts
#16
Fabian Beck, Daniel Weiskopf
Generating visualizations at the size of a word creates dense information representations often called sparklines. The integration of word-sized graphics into text could avoid additional cognitive load caused by splitting the readers' attention between figures and text. In scientific publications, these graphics make statements easier to understand and verify because additional quantitative information is available where needed. In this work, we perform a literature review to find out how researchers have already applied such word-sized representations...
February 24, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28252405/placenta-maps-in-utero-placental-health-assessment-of-the-human-fetus
#17
Haichao Miao, Gabriel Mistelbauer, Alexey Karimov, Amir Alansary, Alice Davidson, David Lloyd, Mellisa Damodaram, Lisa Story, Jana Hutter, Joseph Hajnal, Mary Rutherford, Bernhard Preim, Bernhard Kainz, M Eduard Groller
The human placenta is essential for the supply of the fetus. To monitor the fetal development, imaging data is acquired using ultrasound (US). Although it is currently the gold-standard in fetal imaging, it might not capture certain abnormalities of the placenta. Magnetic resonance imaging (MRI) is a safe alternative for the in utero examination while acquiring the fetus data in higher detail. Nevertheless, there is currently no established procedure for assessing the condition of the placenta and consequently the fetal health...
February 24, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28252404/spatio-temporal-feature-exploration-in-combined-particle-volume-reference-frames
#18
Franz Sauer, Kwan-Liu Ma
The use of large-scale scientific simulations that can represent physical systems using both particle and volume data simultaneously is gaining popularity as each of these reference frames has an inherent set of advantages when studying different phenomena. Furthermore, being able to study the dynamic evolution of these time varying data types is an integral part of nearly all scientific endeavors. However, the techniques available to scientists generally limit them to studying each reference frame separately making it difficult to draw connections between the two...
February 24, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28252403/the-subspace-voyager-exploring-high-dimensional-data-along-a-continuum-of-salient-3d-subspace
#19
Bing Wang, Klaus Mueller
Analyzing high-dimensional data and finding hidden patterns is a difficult problem and has attracted numerous research efforts. Automated methods can be useful to some extent but bringing the data analyst into the loop via interactive visual tools can help the discovery process tremendously. An inherent problem in this effort is that humans lack the mental capacity to truly understand spaces exceeding three spatial dimensions. To keep within this limitation, we describe a framework that decomposes a high-dimensional data space into a continuum of generalized 3D subspaces...
February 23, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28221997/topkube-a-rank-aware-data-cube-for-real-time-exploration-of-spatiotemporal-data
#20
Fabio Miranda, Lauro Lins, James Klosowski, Claudio Silva
From economics to sports to entertainment and social media, ranking objects according to some notion of importance is a fundamental tool we humans use all the time to better understand our world. With the ever-increasing amount of user-generated content found online, "what's trending" is now a commonplace phrase that tries to capture the zeitgeist of the world by ranking the most popular microblogging hashtags in a given region and time. However, before we can understand what these rankings tell us about the world, we need to be able to more easily create and explore them, given the significant scale of today's data...
February 17, 2017: IEEE Transactions on Visualization and Computer Graphics
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