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Summary: Appeared: IEEE Visualization '98, Oct 18-23, 1998.
Efficient Warping for Architectural Walkthroughs
Using Layered Depth Images
Voicu Popescu, Anselmo Lastra, Daniel Aliaga, Manuel de Oliveira Neto
University of North Carolina at Chapel Hill
Abstract
This paper presents efficient image-based rendering techniques
used in the context of an architectural walkthrough system. Portals
(doors and windows) are rendered by warping layered depth
images (LDIs). In a preprocessing phase, for every portal, a
number of pre-rendered images are combined into a LDI. The
resulting LDI stores, exactly once, all surfaces visible in at least
one of the images used in the construction, so most of the
exposure errors are efficiently eliminated. The LDI can be warped
in the McMillan occlusion compatible ordering. A substantial
increase in performance is obtained by warping in parallel. Our
parallelization scheme achieves good load balancing, scales with
the number of processors, and preserves the occlusion compatible
ordering. A fast, conservative reference-image-space clipping
algorithm also reduces the warping effort.
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