author = "Frey, Steffen and Sadlo, Filip and Ertl, Thomas",
          affiliation = "{University of Stuttgart} and {University of Stuttgart} and 
                         {University of Stuttgart}",
                title = "Explorable Volumetric Depth Images from Raycasting",
            booktitle = "Proceedings...",
                 year = "2013",
               editor = "Boyer, Kim and Hirata, Nina and Nedel, Luciana and Silva, 
         organization = "Conference on Graphics, Patterns and Images, 26. (SIBGRAPI)",
            publisher = "IEEE Computer Society",
              address = "Los Alamitos",
             keywords = "Volume Raycasting, Explorable Image, Preview and Offline 
             abstract = "View-dependent image-based rendering techniques have become 
                         increasingly popular as they combine the high quality of images 
                         with the explorability of interactive techniques. However, in the 
                         context of volume rendering, previous approaches suffer from 
                         various shortcomings, including the limitation to surfaces, 
                         expensive generation, and insufficient occlusion and motion 
                         parallax impairing depth perception. In this paper, we propose 
                         Volumetric Depth Images (VDI) to overcome these issues for 
                         view-dependent volume visualization by an extension of the Layered 
                         Depth Image (LDI) approach. Instead of only saving for each view 
                         ray of one camera configuration the depth and color values for a 
                         set of surfaces, as in LDIs, VDIs store so- called supersegments, 
                         each consisting of a depth range as well as composited color and 
                         opacity. This compact representation is independent from the 
                         structure of the original data and can be generated by slight 
                         modification of raycasters with very low overhead. VDIs can be 
                         rendered efficiently at high quality with arbitrary camera 
                         configurations by means of proxy frustum geometry and an efficient 
                         depth ordering scheme. When viewing the scene from the initial 
                         view point, VDIs produce results identical to the original 
                         raycasting. As demonstrated by means of a prototype implementation 
                         and data from different fields, our approach can be useful for 
                         preview rendering and a-priori analysis in in-situ contexts among 
  conference-location = "Arequipa, Peru",
      conference-year = "Aug. 5-8, 2013",
             language = "en",
           targetfile = "paper_final.pdf",
        urlaccessdate = "2020, Nov. 25"