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Opacity volume based halo generation and depth-dependent halos

Yubo Tao, Chao Wang, Hai Lin, Feng Dong, Gordon Clapworthy
2012 The Visual Computer  
Halos are generally used to enhance depth perception and display spatial relationships in illustrative visualization.  ...  At the preprocessing stage, we generate, on graphics hardware, a viewindependent halo intensity volume, which contains all of the potential halos around the boundaries of features, based on the opacity  ...  Bruckner and Gröller [3] presented volumetric halos based on screen-space halo generation to enhance depth perception.  ... 
doi:10.1007/s00371-012-0764-2 fatcat:cirmpmvt3ffvpbzeja6cj76doy

Volume illustration: nonphotorealistic rendering of volume models

P. Rheingans, D. Ebert
2001 IEEE Transactions on Visualization and Computer Graphics  
Volume illustration provides a flexible unified framework for enhancing structural perception of volume models through the amplification of features and the addition of illumination effects.  ...  Transfer function approaches allow flexible design of the volume appearance, but generally require substantial hand tuning for each new data set in order to be effective.  ...  Distance color blending Intensity depth-cuing is a well known technique for enhancing the perception of depth in a scene [Foley96] .  ... 
doi:10.1109/2945.942693 fatcat:qoc6ajynxnfdviavuopzf5fxvm

Enhancing Depth-Perception with Flexible Volumetric Halos

Stefan Bruckner, Eduard Gröller
2007 IEEE Transactions on Visualization and Computer Graphics  
There are many different ways to enhance depth perception, such as shading, contours, and shadows. Artists and illustrators frequently employ halos for this purpose.  ...  Based on this concept, we present a flexible method for enhancing and highlighting structures of interest using GPU-based direct volume rendering.  ...  ACKNOWLEDGEMENTS We thank the anonymous reviewers for their valuable comments.  ... 
doi:10.1109/tvcg.2007.70555 pmid:17968083 fatcat:nejgsbpmkfhupjhc3gdnnc2ty4

Feature enhancement by volumetric unsharp masking

Yubo Tao, Hai Lin, Hujun Bao, Feng Dong, Gordon Clapworthy
2009 The Visual Computer  
Feature enhancement is important for the interpretation of complex structures and the detection of local details in volume visualization.  ...  The results showed that volumetric unsharp masking reveals more local details and improves depth perception.  ...  The data sets are courtesy of Olaf Ronneberger, General Electric, and VoreenPub.  ... 
doi:10.1007/s00371-009-0328-2 fatcat:ozwhf6pz6jetxc6i4s5anjhica

Perceptually-Based Depth-Ordering Enhancement for Direct Volume Rendering

Lin Zheng, Yingcai Wu, Kwan-Liu Ma
2013 IEEE Transactions on Visualization and Computer Graphics  
Existing methods use visual cues such as halos and shadows to enhance depth perception. Along with other limitations, these methods introduce redundant information and require additional overhead.  ...  This paper presents a new approach to enhancing depth-ordering perception of volume rendered images without using additional visual cues.  ...  Bruckner and Gröller [6] introduced an approach that enables users to generate halos interactively for volume data using the halo transfer function. Everts et al.  ... 
doi:10.1109/tvcg.2012.144 pmid:22732679 fatcat:pzs4vxoj7nhapnluci7ov4bi2m

Real-time ambient occlusion and halos with Summed Area Tables

José Díaz, Pere-Pau Vázquez, Isabel Navazo, Florent Duguet
2010 Computers & graphics  
Illustrators usually use certain techniques such as improving the shading through shadows, halos, or edge darkening in order to enhance depth perception of certain structures.  ...  Volume models often show high depth complexity. This poses difficulties to the observer in judging the spatial relationships accurately.  ...  The authors want to thank the anonymous reviewers for their valuable comments.  ... 
doi:10.1016/j.cag.2010.03.005 fatcat:4id37w4nxrc27pg6s4zlbv4g74

Strategies for interactive exploration of 3D flow using evenly-spaced illuminated streamlines

Oliver Mattausch, Thomas Theußl, Helwig Hauser, Eduard Gröller
2003 Proceedings of the 18th spring conference on Computer graphics - SCCG '03  
To improve spatial perception of the 3D flow we apply techniques based on animation, depth cueing, and halos along a streamline if it is crossed by another streamline in the foreground.  ...  Finally, we make intense use of focus+context methods like magic volumes, region of interest driven streamline placing, and spotlights to solve the occlusion problem.  ...  [6] point out the use of animation to improve depth perception. They introduce an algorithm for animating texture based particles along a streamline.  ... 
doi:10.1145/984952.984987 dblp:conf/sccg/MattauschTHG03 fatcat:uojibe4hfzeqzfgzzk6dc7fbly

Real-Time Advection and Volumetric Illumination for the Visualization of 3D Unsteady Flow [article]

Daniel Weiskopf, Tobias Schafhitzel, Thomas Ertl
2005 EUROVIS 2005: Eurographics / IEEE VGTC Symposium on Visualization  
Perception-guided volume shading methods are included, such as halos, cool/warm shading, or color-based depth cueing.  ...  Slice-based direct volume rendering is used for the final display. A real-time computation of gradients is employed to achieve volume illumination.  ...  Acknowledgments We would like to thank Roger Crawfis for providing the tornado data set used in Figure 4 , Simon "nine-to-go" Stegmaier for help with the λ 2 code, and Mark Segal (ATI) for the Radeon  ... 
doi:10.2312/vissym/eurovis05/013-020 fatcat:74wj6ijsuncaphicooebitpaou

Effective visualization of complex vascular structures using a non-parametric vessel detection method

A. Joshi, Xiaoning Qian, D. Dione, K. Bulsara, C. Breuer, A. Sinusas, X. Papademetris
2008 IEEE Transactions on Visualization and Computer Graphics  
Results indicate that experts preferred distance color blending and tone shading for conveying depth over standard visualization techniques.  ...  Compared to standard Hessian based techniques, which are fine-tuned to identify long cylindrical structures, our technique identifies branches and connections with other vessels.  ...  [1] applied depth enhancing halos using graphics hardware and discussed their benefits for conveying depth.  ... 
doi:10.1109/tvcg.2008.123 pmid:18989016 pmcid:PMC2636705 fatcat:ss5evbv2ebe7jlxncjtr6fllsy

Procedural Volume Modeling, Rendering, and Visualization [chapter]

David Ebert, Penny Rheingans
2003 Data Visualization  
Christopher Morris generated some of the pictures included in this paper.  ...  This material is based on work supported by the National Science Foundation under Grants No. 0081581, 9996043, and 9978032. 7.  ...  Feature halos Illustrators sometimes use null halos around foreground features to reinforce the perception of depth relationships within a scene.  ... 
doi:10.1007/978-1-4615-1177-9_22 fatcat:o7c5jfh4pnf6hb7ihaacxcwcom

Dense Geometric Flow Visualization [article]

Sung W. Park, Brian Budge, Lars Linsen, Bernd Hamann, Kenneth I. Joy
2005 EUROVIS 2005: Eurographics / IEEE VGTC Symposium on Visualization  
Geometry is rendered in graphics hardware using techniques such as depth sorting, illumination, haloing, flow orientation, and depth-based color attenuation to enhance visual perception.  ...  By adopting ideas from texture-based techniques and taking advantage of parallelism and programmability of contemporary graphics hardware, we generate streamlines and pathlines addressing both steady and  ...  We thank the members of the Visualization and Computer Graphics Research Group at the Institute for Data Analysis and Visualization (IDAV) at the University of California, Davis.  ... 
doi:10.2312/vissym/eurovis05/021-028 fatcat:wfpihfjieffsvmetsiw6kudgsm

Tractography in Context: Multimodal Visualization of Probabilistic Tractograms in Anatomical Context [article]

Anne Berres, Mathias Goldau, Marc Tittgemeyer, Gerik Scheuermann, Hans Hagen
2012 Eurographics Workshop on Visual Computing for Biomedicine  
Unique dataset features are reflected by value-based opacity and further enhanced by depth cues.  ...  The presented methods are based on a detailed requirements analysis with domain experts.  ...  Furthermore, we thank the Max Planck Institute for Human Cognitive and Brain Sciences for providing the datasets, and the OpenWalnut development team for their support.  ... 
doi:10.2312/vcbm/vcbm12/009-016 fatcat:wm6x4zo3kjae5pcyhd6b6in6au

A Survey of Perceptually Motivated 3D Visualization of Medical Image Data

Bernhard Preim, Alexandra Baer, Douglas Cunningham, Tobias Isenberg, Timo Ropinski
2016 Computer graphics forum (Print)  
These evaluations assessed depth and shape perception with depth judgment, orientation matching, and related tasks.  ...  This survey provides an overview of perceptually motivated techniques for the visualization of medical image data, including physics-based lighting techniques as well as illustrative rendering that incorporate  ...  We thank the authors that let us use their images for our survey. For fruitful discussions on this manuscript we thank Christian Hansen, Maria Luz, Felix Ritter, and Ivan Viola.  ... 
doi:10.1111/cgf.12927 fatcat:avmv75vbqzgrzics2vrttqcyhe

Visualization of Cardiac Blood Flow Using Anisotropic Ambient Occlusion for Lines [article]

Benjamin Köhler, Matthias Grothoff, Matthias Gutberlet, Bernhard Preim
2017 International Symposium on Vision, Modeling, and Visualization  
We further enhance the perception of homogeneous flow by incorporating depth-dependent halos.  ...  Ambient occlusion (AO) for lines (LineAO) was introduced by Eichelbaum et al.  ...  Seibt for fruitful discussions.  ... 
doi:10.2312/vmv.20171256 dblp:conf/vmv/0001GGP17 fatcat:k4oz6pdec5fctcb2algzvzlrea

DTI volume rendering techniques for visualising the brain anatomy

Burkhard Wünsche, Jarno van der Linden, Nathan Holmberg
2005 Excerpta Medica: International Congress Series  
We present two novel methods which improve the perception of the 3D arrangements of fibre tracts.  ...  The enhancement of tube silhouettes improves the identification of individual fibre tracts and their 3D arrangement.  ...  A second method uses a direct volume rendering technique which represents fibre tracts by a line integral convolution texture and uses an opacity transfer functions based on a fuzzy tissue classier which  ... 
doi:10.1016/j.ics.2005.03.333 fatcat:hcrdx7kburg3llfzbno723lwpi
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