Browsing by Author "Li, Y. -N"
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Item Interactive Influences of Color Attributes on Color Perception Bias(Springer Verlag, 2019-06-12) Yang, H.; Li, Y. -N; Zhang, Kang; 65983012 (Zhang, K); Zhang, KangGraphic user interfaces and information visualization use color to represent qualitative or quantitative information. The interaction between adjacent colors leads to perceptual bias, known as simultaneous color contrast, and implicitly distort the understanding of visualized information presentation. To investigate the effect of simultaneous color contrast, we conduct two empirical experiments, in both theoretical and application settings, using a set of random target/proximal combinations of colors in the CIEL*a*b* color space. The perception bias of a target color, induced by its surround, is measured. Linear regression analysis indicates that both a high saturation of the proximal color and a high a*/low b* value of the target color cause a strong simultaneous color contrast (i.e., high perception bias). A moderating effect analysis indicates that a* value/b* value of the target color moderates the influence of the saturation of the proximal color on the perception bias. For example, controlling the saturation of the proximal color, the more reddish/yellowish the target color is, the more alleviated the perceptual bias is. ©2019, Springer-Verlag GmbH Germany, part of Springer Nature.Item The Influence of Edge Bundling on Visual Information Search(Elsevier Inc., 2019-05-04) Li, Y. -N; Zhang, Kang; Hu, D. -N; Huang, M. L.; 65983012 (Zhang, K); Zhang, KangMillions of nodes and edges in a node-link diagram representing the network structure of big data may clutter the space, reducing the aesthetic quality and hindering the process of information search. Edge bundling offers an approach to solve this problem. However, to what extent that edge bundling can solve the problem remains unclear. Addressing the literature in visual complexity and Gestalt law of prägnanz, we empirically examine the influence of edge bundling on users’ information search performance, i.e., the accuracy, responding time and perceptual fluency under different levels of bundling strength. The paper reports our findings with detailed discussions. © 2019 Elsevier Inc.Item Visual Exploration of 3d Geospatial Networks in a Virtual Reality Environment(Oxford University Press) Zhang, M. -J; Zhang, Kang; Li, J.; Li, Y. -N; 65983012 (Zhang, K); Zhang, KangClassic geospatial network visualization tends to limit itself to 2D representation by organizing edges and nodes on a 2D map or the external surface of a traditional 3D globe model. Visual clutters and occlusions due to edge crossings and node-edge overlaps make efficient and effective exploration of geospatial networks a challenge. This paper proposes an interactive visualization approach for the intuitive exploration of geospatial networks inside a spherical virtual reality environment. To reduce visual clutter and reveal network patterns, we also propose a parameterized 5-step 3D edge-bundling algorithm and a set of techniques to avoid collision of network edges with the viewpoint. Our spherical interaction and 3D edge-bundling approach have been implemented in an Oculus Rift VR system. We demonstrate the usefulness of our approach with two case studies on real-world network data and usability experiments. ©2018 The British Computer Society. All rights reserved.