Void Space Surfaces to Convey Depth in Vessel Visualizations

Julian Kreiser, Pedro Hermosilla, Timo Ropinski

View presentation: 2020-10-28T17:00:00Z GMT-0600 Change your timezone on the schedule page
Exemplar figure
Example of a vascular structure visualized using our technique, Void Space Surfaces. Our technique takes advantage of the empty space between vessels and interpolates a surface between them in which different depth cues can be applied, such as dark-means-deep (left), pseudo-chromadepth (middle), chromadepth (right), or advanced illumination techniques and iso-lines (all figures). Moreover, since depth cues have been shifted away from the vessels’ surface, additional information can be encoded on them.
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Direct link to video on YouTube: https://youtu.be/CbyO6HYSGdw


Depth Perception, Void Space Surface, Chromadepth


To enhance depth perception and thus data comprehension, additional depth cues are often used in 3D visualizations of complex vascular structures. There is a variety of different approaches described in theliterature, ranging from chromadepth color coding over depth of field to glyph-based encodings. Unfortunately, the majority of existing approaches suffers from the same problem: As these cues are directly applied to the geometry's surface, the display of additional information on the vessel wall, such as other modalities or derived attributes, is impaired. To overcome this limitation we propose Void Space Surfaces which utilizes empty space in between vessel branches to communicate depth and their relative positioning. This allows us to enhance the depth perception of vascular structures without interfering with the spatial data and potentially superimposed parameter information. With this paper, we introduce Void Space Surfaces, describe their technical realization, and show their application to various vessel trees. Moreover, we report the outcome of two user studies which we have conducted in order to evaluate the perceptual impact of Void Space Surfaces compared to existing vessel visualization techniques and discuss expert feedback.