In our daily lives, images and texts are among the most commonly found data which we need to handle. We
present iGraph, a graph-based approach for visual analytics of large image and text collections. Given such a
collection, we compute the similarity between images, the distance between texts, and the connection between
image and text to construct iGraph, a compound graph representation which encodes the underlying relationships
among these images and texts. To enable effective visual navigation and comprehension of iGraph with tens of
thousands of nodes and hundreds of millions of edges, we present a progressive solution that offers collection
overview, node comparison, and visual recommendation. Our solution not only allows users to explore the entire
collection with representative images and keywords, but also supports detailed comparison for understanding and
intuitive guidance for navigation. For performance speedup, multiple GPUs and CPUs are utilized for processing
and visualization in parallel. We experiment with two image and text collections and leverage a cluster driving a
display wall of nearly 50 million pixels. We show the effectiveness of our approach by demonstrating experimental
results and conducting a user study.
Streamline visualization can be formulated as the problem of streamline placement or streamline selection. In this
paper, we present an importance-driven approach to view-dependent streamline selection that guarantees coherent
streamline update when the view changes gradually. Given a large number of randomly or uniformly seeded
and traced streamlines and sample viewpoints, our approach evaluates, for each streamline, the view-dependent
importance by considering the amount of information shared by the 3D streamline and its 2D projection as well as
how stereoscopic the streamline’s shape is reflected under each viewpoint. We achieve coherent view-dependent
streamline selection following a two-pass solution that considers i) the relationships between local viewpoints
and the global streamline set selected in a view-independent manner and ii) the continuity between adjacent
viewpoints. We demonstrate the effectiveness of our approach with several synthesized and simulated flow fields
and compare our view-dependent streamline selection algorithm with a naïve algorithm that selects streamlines
solely based on the information at the current viewpoint.
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