Fast Visualization of Object Contours by Non-Photorealistic Volume Rendering

Information

• Publication Type: Technical Report
• Workgroup(s)/Project(s): not specified
• Date: April 2001
• Number: TR-186-2-01-09
• Keywords: shear-warp projection, non-photorealistic rendering, interactive volume rendering

Abstract

In this paper we present a fast visualization technique for volumetric data, which is based on a recent non-photorealistic rendering technique. Our new approach enables alternative insights into 3D data sets (compared to traditional approaches such as direct volume rendering or iso-surface rendering). Object contours, which usually are characterized by locally high gradient values, are visualized regardless of their density values. Cumbersome tuning of transfer functions, as usually needed for setting up DVR views is avoided. Instead, a small number of parameters is available to adjust the non-photorealistic display. Based on the magnitude of local gradient information as well as on the angle between viewing direction and gradient vector, data values are mapped to visual properties (color, opacity), which then are combined to form the rendered image (MIP is proposed as the default compositing stragtegy here). Due to the fast implementation of this alternative rendering approach, it is possible to interactively investigate the 3D data, and quickly learn about internal structures. Several further extensions of our new approach, such as level lines are also presented in this paper.

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BibTeX

@techreport{Csebfalvi-2001-NPVR,
  title =      "Fast Visualization of Object Contours by Non-Photorealistic
               Volume Rendering",
  author =     "Bal\'{a}zs Cs\'{e}bfalvi and Lukas Mroz and Helwig Hauser
               and Andreas K\"{o}nig and Eduard Gr\"{o}ller",
  year =       "2001",
  abstract =   "In this paper we present a fast visualization technique for
               volumetric data, which is based on a recent
               non-photorealistic rendering technique.  Our new approach
               enables alternative insights into 3D data sets (compared to
               traditional approaches such as direct volume rendering or
               iso-surface rendering). Object contours, which usually are
               characterized by locally high gradient values, are
               visualized regardless of their density values. Cumbersome
               tuning of transfer functions, as usually needed for setting
               up DVR views is avoided.  Instead, a small number of
               parameters is available to adjust the non-photorealistic
               display. Based on the magnitude of local gradient
               information as well as on the angle between viewing
               direction and gradient vector, data values are mapped to
               visual properties (color, opacity), which then are combined
               to form the rendered image (MIP is proposed as the default
               compositing stragtegy here).  Due to the fast implementation
               of this alternative rendering approach, it is possible to
               interactively investigate the 3D data, and quickly learn
               about internal structures. Several further extensions of our
               new approach, such as level lines                   are also
               presented in this paper.",
  month =      apr,
  number =     "TR-186-2-01-09",
  address =    "Favoritenstrasse 9-11/E193-02, A-1040 Vienna, Austria",
  institution = "Institute of Computer Graphics and Algorithms, Vienna
               University of Technology ",
  note =       "human contact: technical-report@cg.tuwien.ac.at",
  keywords =   "shear-warp projection, non-photorealistic rendering,
               interactive volume rendering",
  URL =        "https://www.cg.tuwien.ac.at/research/publications/2001/Csebfalvi-2001-NPVR/",
}