Khairi Reda
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View article: Color-Name Aware Optimization to Enhance the Perception of Transparent Overlapped Charts
Color-Name Aware Optimization to Enhance the Perception of Transparent Overlapped Charts Open
Transparency is commonly utilized in visualizations to overlay color-coded histograms or sets, thereby facilitating the visual comparison of categorical data. However, these charts often suffer from significant overlap between objects, res…
View article: Could Humans Outshine AI in Visual Data Analysis?
Could Humans Outshine AI in Visual Data Analysis? Open
People often use visualizations not only to explore a dataset but also to draw generalizable conclusions about underlying models or phenomena. While previous research has viewed deviations from rational analysis as problematic, we hypothes…
View article: Science in a Blink: Supporting Ensemble Perception in Scalar Fields
Science in a Blink: Supporting Ensemble Perception in Scalar Fields Open
Visualizations support rapid analysis of scientific datasets, allowing viewers to glean aggregate information (e.g., the mean) within split-seconds. While prior research has explored this ability in conventional charts, it is unclear if sp…
View article: Development of a Real-Time Dashboard for Overdose Touchpoints: User-Centered Design Approach
Development of a Real-Time Dashboard for Overdose Touchpoints: User-Centered Design Approach Open
Background Overdose Fatality Review (OFR) is an important public health tool for shaping overdose prevention strategies in communities. However, OFR teams review only a few cases at a time, which typically represent a small fraction of the…
View article: Color Maker: a Mixed-Initiative Approach to Creating Accessible Color Maps
Color Maker: a Mixed-Initiative Approach to Creating Accessible Color Maps Open
Quantitative data is frequently represented using color, yet designing\neffective color mappings is a challenging task, requiring one to balance\nperceptual standards with personal color preference. Current design tools\neither overwhelm n…
View article: Development of a Real-Time Dashboard for Overdose Touchpoints: User-Centered Design Approach (Preprint)
Development of a Real-Time Dashboard for Overdose Touchpoints: User-Centered Design Approach (Preprint) Open
BACKGROUND Overdose Fatality Review (OFR) is an important public health tool for shaping overdose prevention strategies in communities. However, OFR teams review only a few cases at a time, which typically represent a small fraction of th…
View article: Interactive Context-Preserving Color Highlighting for Multiclass Scatterplots
Interactive Context-Preserving Color Highlighting for Multiclass Scatterplots Open
Color is one of the main visual channels used for highlighting elements of\ninterest in visualization. However, in multi-class scatterplots, color\nhighlighting often comes at the expense of degraded color discriminability. In\nthis paper,…
View article: Visual Belief Elicitation Reduces the Incidence of False Discovery
Visual Belief Elicitation Reduces the Incidence of False Discovery Open
Visualization supports exploratory data analysis (EDA), but EDA frequently\npresents spurious charts, which can mislead people into drawing unwarranted\nconclusions. We investigate interventions to prevent false discovery from\nvisualized …
View article: Rainbow Colormaps: What are they good and bad for?
Rainbow Colormaps: What are they good and bad for? Open
Guidelines for color use in quantitative visualizations have strongly discouraged the use of rainbow colormaps, arguing instead for smooth designs that do not induce visual discontinuities or implicit color categories. However, the empiric…
View article: Data Prophecy: Exploring the Effects of Belief Elicitation in Visual Analytics
Data Prophecy: Exploring the Effects of Belief Elicitation in Visual Analytics Open
Interactive visualizations are widely used in exploratory data analysis, but existing systems provide limited support for confirmatory analysis. We introduce PredictMe, a tool for belief-driven visual analysis, enabling users to draw and t…
View article: Sequoia: An interactive visual analytics platform for interpretation and feature extraction from nanopore sequencing datasets
Sequoia: An interactive visual analytics platform for interpretation and feature extraction from nanopore sequencing datasets Open
Sequoia is a visualization tool that allows biologists to explore characteristics of signals generated by the Oxford Nanopore Technologies (ONT) in detail. From Fast5 files generated by ONT, the tool displays relative similarities between …
View article: Evaluating Gradient Perception in Color-Coded Scalar Fields
Evaluating Gradient Perception in Color-Coded Scalar Fields Open
Color mapping is a commonly used technique for visualizing scalar fields. While there exists advice for choosing effective colormaps, it is unclear if current guidelines apply equally across task types. We study the perception of gradients…
View article: Dynamic Glyphs: Appropriating Causality Perception in Multivariate Visual Analysis
Dynamic Glyphs: Appropriating Causality Perception in Multivariate Visual Analysis Open
We investigate how to co-opt the perception of causality to aid the analysis of multivariate data. We propose Dynamic Glyphs (DyGs), an animated extension to traditional glyphs. DyGs encode data relations through seemingly physical interac…
View article: Evaluating Gradient Perception in Color-Coded Scalar Fields
Evaluating Gradient Perception in Color-Coded Scalar Fields Open
Color mapping is a commonly used technique for visualizing scalar fields. While there exists advice for choosing effective colormaps, it is unclear if current guidelines apply equally across task types. We study the perception of gradients…
View article: Concept-Driven Visual Analytics
Concept-Driven Visual Analytics Open
Visualization tools facilitate exploratory data analysis, but fall short at supporting hypothesis-based reasoning. We conducted an exploratory study to investigate how visualizations might support a concept-driven analysis style, where use…
View article: Towards Concept-Driven Visual Analytics
Towards Concept-Driven Visual Analytics Open
Visualizations of data provide a proven method for analysts to explore and make data-driven discoveries. However, current visualization tools provide only limited support for hypothesis-driven analyses, and often lack capabilities that wou…