Computer Graphics
TU Braunschweig

Spacetime Tetrahedra: Image-Based Viewpoint Navigation through Space and Time


Spacetime Tetrahedra: Image-Based Viewpoint Navigation through Space and Time

We present a purely image-based rendering system to viewpoint-navigate through space and time of arbitrary dynamic scenes. Unlike previous methods, our approach does not rely on synchronized and calibrated multi-video footage as input. Instead of estimating scene depth or reconstructing 3D geometry, our approach is based on dense image correspondences, treating view interpolation equally in space and time. In a nutshell, we tetrahedrally partition the volume spanned by camera directions and time, determine the warp field along each tetrahedral edge, and warp-blend-interpolate any viewpoint inside a tetrahedron from the four video frames representing its vertices. Besides fast and easy acquisition to make outdoor recordings feasible, our space-time symmetric approach allows for smooth interpolation of view perspective and time, i.e., for simultaneous free-viewpoint and slow motion rendering.


Author(s):Christian Lipski, Georgia Albuquerque, Timo Stich, Marcus Magnor
Year:2008
Month:December
Type:Technical Report
Institution:
Note:http://www.digibib.tu-bs.de/?docid=00023968
Project(s): Virtual Video Camera 


@techreport{lipski2008stt,
  title = {Spacetime Tetrahedra: Image-Based Viewpoint Navigation through Space and Time},
  author = {Lipski, Christian and Albuquerque, Georgia and Stich, Timo and Magnor, Marcus},
  institution = {Institut f{\"u}r Computergraphik, {TU} Braunschweig},
  number = {12-9},
  note = {http://www.digibib.tu-bs.de/?docid=00023968},
  month = {Dec},
  year = {2008}
}

Authors