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- research-articleDecember 2023
VIPurPCA: Visualizing and Propagating Uncertainty in Principal Component Analysis
IEEE Transactions on Visualization and Computer Graphics (ITVC), Volume 30, Issue 4Pages 2011–2022https://doi.org/10.1109/TVCG.2023.3345532Variables obtained by experimental measurements or statistical inference typically carry uncertainties. When an algorithm uses such quantities as input variables, this uncertainty should propagate to the algorithm's output. Concretely, we consider ...
- research-articleNovember 2023
PSRFlow: Probabilistic Super Resolution with Flow-Based Models for Scientific Data
IEEE Transactions on Visualization and Computer Graphics (ITVC), Volume 30, Issue 1Pages 986–996https://doi.org/10.1109/TVCG.2023.3327171Although many deep-learning-based super-resolution approaches have been proposed in recent years, because no ground truth is available in the inference stage, few can quantify the errors and uncertainties of the super-resolved results. For scientific ...
- research-articleOctober 2023
ggdist: Visualizations of Distributions and Uncertainty in the Grammar of Graphics
IEEE Transactions on Visualization and Computer Graphics (ITVC), Volume 30, Issue 1Pages 414–424https://doi.org/10.1109/TVCG.2023.3327195The grammar of graphics is ubiquitous, providing the foundation for a variety of popular visualization tools and toolkits. Yet support for uncertainty visualization in the grammar graphics—beyond simple variations of error bars, uncertainty bands, ...
- research-articleOctober 2023
Reclaiming the Horizon: Novel Visualization Designs for Time-Series Data with Large Value Ranges
IEEE Transactions on Visualization and Computer Graphics (ITVC), Volume 30, Issue 1Pages 1161–1171https://doi.org/10.1109/TVCG.2023.3326576We introduce two novel visualization designs to support practitioners in performing identification and discrimination tasks on large value ranges (i.e., several orders of magnitude) in time-series data: (1) The <italic>order of magnitude horizon</italic> ...
- research-articleOctober 2023
Visualization According to Statisticians: An Interview Study on the Role of Visualization for Inferential Statistics
IEEE Transactions on Visualization and Computer Graphics (ITVC), Volume 30, Issue 1Pages 230–239https://doi.org/10.1109/TVCG.2023.3326521Statisticians are not only one of the earliest professional adopters of data visualization, but also some of its most prolific users. Understanding how these professionals utilize visual representations in their analytic process may shed light on best ...
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- research-articleAugust 2022
Blending Surface Segmentation and Editing for 3D Models
IEEE Transactions on Visualization and Computer Graphics (ITVC), Volume 28, Issue 8Pages 2879–2894https://doi.org/10.1109/TVCG.2020.3045450Recognizing and fitting shape primitives from underlying 3D models are key components of many computer graphics and computer vision applications. Although a vast number of structural recovery methods are available, they usually fail to identify blending ...
- research-articleDecember 2021
A Discrete Probabilistic Approach to Dense Flow Visualization
IEEE Transactions on Visualization and Computer Graphics (ITVC), Volume 27, Issue 12Pages 4347–4358https://doi.org/10.1109/TVCG.2020.3006995Dense flow visualization is a popular visualization paradigm. Traditionally, the various models and methods in this area use a continuous formulation, resting upon the solid foundation of functional analysis. In this work, we examine a discrete ...
- research-articleDecember 2021
Probabilistic Data-Driven Sampling via Multi-Criteria Importance Analysis
IEEE Transactions on Visualization and Computer Graphics (ITVC), Volume 27, Issue 12Pages 4439–4454https://doi.org/10.1109/TVCG.2020.3006426Although supercomputers are becoming increasingly powerful, their components have thus far not scaled proportionately. Compute power is growing enormously and is enabling finely resolved simulations that produce never-before-seen features. However, I/O ...
- research-articleAugust 2021
Can Visualization Alleviate Dichotomous Thinking? Effects of Visual Representations on the Cliff Effect
IEEE Transactions on Visualization and Computer Graphics (ITVC), Volume 27, Issue 8Pages 3397–3409https://doi.org/10.1109/TVCG.2021.3073466Common reporting styles for statistical results in scientific articles, such as <inline-formula><tex-math notation="LaTeX">$p$</tex-math><alternatives><mml:math><mml:mi>p</mml:mi></mml:math><inline-graphic xlink:href="helske-ieq1-3073466.gif"/></...
- research-articleJanuary 2019
Comparing Similarity Perception in Time Series Visualizations
IEEE Transactions on Visualization and Computer Graphics (ITVC), Volume 25, Issue 1Pages 523–533https://doi.org/10.1109/TVCG.2018.2865077A common challenge faced by many domain experts working with time series data is how to identify and compare similar patterns. This operation is fundamental in high-level tasks, such as detecting recurring phenomena or creating clusters of similar ...
- research-articleJanuary 2019
CoDDA: A Flexible Copula-based Distribution Driven Analysis Framework for Large-Scale Multivariate Data
IEEE Transactions on Visualization and Computer Graphics (ITVC), Volume 25, Issue 1Pages 1214–1224https://doi.org/10.1109/TVCG.2018.2864801CoDDA (<bold>C</bold>opula-based <bold>D</bold>istribution <bold>D</bold>riven <bold>A</bold>nalysis) is a flexible framework for large-scale multivariate datasets. A common strategy to deal with large-scale scientific simulation data is to partition the ...
- research-articleJanuary 2019
Probabilistic Asymptotic Decider for Topological Ambiguity Resolution in Level-Set Extraction for Uncertain 2D Data
IEEE Transactions on Visualization and Computer Graphics (ITVC), Volume 25, Issue 1Pages 1163–1172https://doi.org/10.1109/TVCG.2018.2864505We present a framework for the analysis of uncertainty in isocontour extraction. The marching squares (MS) algorithm for isocontour reconstruction generates a linear topology that is consistent with hyperbolic curves of a piecewise bilinear interpolation. ...
- research-articleSeptember 2017
Knot Optimization for Biharmonic B-splines on Manifold Triangle Meshes
IEEE Transactions on Visualization and Computer Graphics (ITVC), Volume 23, Issue 9Pages 2082–2095https://doi.org/10.1109/TVCG.2016.2605092Biharmonic B-splines, proposed by Feng and Warren, are an elegant generalization of univariate B-splines to planar and curved domains with fully irregular knot configuration. Despite the theoretic breakthrough, certain technical difficulties are ...
- research-articleJanuary 2017
Probabilistic Graph Layout for Uncertain Network Visualization
IEEE Transactions on Visualization and Computer Graphics (ITVC), Volume 23, Issue 1Pages 531–540https://doi.org/10.1109/TVCG.2016.2598919We present a novel uncertain network visualization technique based on node-link diagrams. Nodes expand spatially in our probabilistic graph layout, depending on the underlying probability distributions of edges. The visualization is created by computing ...
- research-articleMarch 2016
Layer-Wise Floorplan Extraction for Automatic Urban Building Reconstruction
IEEE Transactions on Visualization and Computer Graphics (ITVC), Volume 22, Issue 3Pages 1261–1277https://doi.org/10.1109/TVCG.2015.2505296Urban building reconstruction is an important step for urban digitization and realisticvisualization. In this paper, we propose a novel automatic method to recover urban building geometry from 3D point clouds. The proposed method is suitable for buildings ...
- research-articleJanuary 2016
Isosurface Visualization of Data with Nonparametric Models for Uncertainty
IEEE Transactions on Visualization and Computer Graphics (ITVC), Volume 22, Issue 1Pages 777–786https://doi.org/10.1109/TVCG.2015.2467958The problem of isosurface extraction in uncertain data is an important research problem and may be approached in two ways. One can extract statistics (e.g., mean) from uncertain data points and visualize the extracted field. Alternatively, data ...
- research-articleJanuary 2016
Beyond Weber's Law: A Second Look at Ranking Visualizations of Correlation
IEEE Transactions on Visualization and Computer Graphics (ITVC), Volume 22, Issue 1Pages 469–478https://doi.org/10.1109/TVCG.2015.2467671Models of human perception - including perceptual “laws” - can be valuable tools for deriving visualization design recommendations. However, it is important to assess the explanatory power of such models when using them to inform design. We ...
- research-articleJanuary 2016
Visual Analytics for Development and Evaluation of Order Selection Criteria for Autoregressive Processes
IEEE Transactions on Visualization and Computer Graphics (ITVC), Volume 22, Issue 1Pages 151–159https://doi.org/10.1109/TVCG.2015.2467612Order selection of autoregressive processes is an active research topic in time series analysis, and the development and evaluation of automatic order selection criteria remains a challenging task for domain experts. We propose a visual analytics approach,...
- research-articleJanuary 2016
Temporal MDS Plots for Analysis of Multivariate Data
IEEE Transactions on Visualization and Computer Graphics (ITVC), Volume 22, Issue 1Pages 141–150https://doi.org/10.1109/TVCG.2015.2467553Multivariate time series data can be found in many application domains. Examples include data from computer networks, healthcare, social networks, or financial markets. Often, patterns in such data evolve over time among multiple dimensions and are hard ...