NDLI: Coverage-based opacity estimation for interactive Depth of Field in molecular visualization

Content Provider	IEEE Xplore Digital Library
Author	Kottravel, S. Falk, M. Sunden, E. Ropinski, T.
Copyright Year	2015
Description	Author affiliation: Visual Comput. Res. Group, Ulm Univ., Ulm, Germany (Ropinski, T.) \|\| Interactive Visualization Group, Linkoping Univ., Linkoping, Sweden (Kottravel, S.; Falk, M.; Sunden, E.)
Abstract	In this paper, we introduce coverage-based opacity estimation to achieve Depth of Field (DoF) effects when visualizing molecular dynamics (MD) data. The proposed algorithm is a novel object-based approach which eliminates many of the shortcomings of state-of-the-art image-based DoF algorithms. Based on observations derived from a physically-correct reference renderer, coverage-based opacity estimation exploits semi-transparency to simulate the blur inherent to DoF effects. It achieves high quality DoF effects, by augmenting each atom with a semi-transparent shell, which has a radius proportional to the distance from the focal plane of the camera. Thus, each shell represents an additional coverage area whose opacity varies radially, based on our observations derived from the results of multi-sampling DoF algorithms. By using the proposed technique, it becomes possible to generate high quality visual results, comparable to those achieved through ground-truth multi-sampling algorithms. At the same time, we obtain a significant speedup which is essential for visualizing MD data as it enables interactive rendering. In this paper, we derive the underlying theory, introduce coverage-based opacity estimation and demonstrate how it can be applied to real world MD data in order to achieve DoF effects. We further analyze the achieved results with respect to performance as well as quality and show that they are comparable to images generated with modern distributed ray tracing engines.
Starting Page	255
Ending Page	262
File Size	13934923
Page Count	8
File Format	PDF
ISBN	9781467368797
DOI	10.1109/PACIFICVIS.2015.7156385
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-04-14
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Atomic measurements shading I.3.7 [Computer Graphics]: Three-Dimensional Graphics and Realism—Color Estimation Data visualization texture Apertures Rendering (computer graphics) Cameras Lenses shadowing
Content Type	Text
Resource Type	Article

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