Creating raster Omnimax images from multiple perspective views using the elliptical weighted average filter

  • Authors:
  • Ned Greene;Paul S. Heckbert

  • Affiliations:
  • New York Institute of Technology, NY;Pixar, Inc., San Rafael, CA

  • Venue:
  • IEEE Computer Graphics and Applications
  • Year:
  • 1986

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Abstract

Creation of Omnimax animation by computer opens up fantastic new visual possibilities. Unfortunately, the fish-eye distortion of Omnimax film images complicates synthesis by computer, since most image-synthesis programs can create only perspective views. As an alternative to modifying existing image-synthesis programs to produce Omnimax projections directly, we present a method for creating them from multiple perspective views. Four perspective views of the environment are created, each a projection onto a face of a cube centered at the camera, and then a mapping program creates an Omnimax projection from them. To minimize aliasing during resampling, the mapping program uses the elliptical weighted average filter, a space-variant filter we developed for this application that computes a weighted average over an arbitrarily oriented elliptical area. This filter can also be used for texture mapping 3D surfaces.