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Image based Rendering of Walk-throughs |
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Description:
Recently, the problem of image based rendering has attracted considerable
attention wherein the environmental map for rendering of novel views
are maintained in terms of a set of images instead of explicit
geometric and photommetric models of a
scene. Here we address the problem of generation of a sequence
of novel views of a scene from a set of reference views. We assume that i)
the scene surfaces can be approximated by planar patches (a common
situation), and ii) every region in a target view is visible from at least
two reference views; and develop a complete walk-through generation system
starting from a set of sparse correspondences between the reference views.
We consider the situation where the scene can have multiple occluding
boundaries and present a simple visibility analysis algorithm to determine
which parts of a target novel view are visible in which parts of the
reference views. As a consequence, we can explicitly resolve the
visibility issues of image based rendering - those of folds, where
multiple points of the reference images map on to a single point in a
target image, and holes, where a region occluded in a reference
image becomes visible in a target image. Our method is based on
segmentation of
the scene in terms of homographies between regions in the reference images
through the planar patches
Results:
We show a sample walk-through sequence generated from three reference
images:
Reference images
The Walk-through sequence (Mpeg 2.75 MB)
(click on the image below)
Paper
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A System for Image Based Rendering of Walk-throughs.
Dinesh Rathi, Gaurav Agarwal, Prem Kalra and Subhashis Banerjee
Accepted for Computer Graphics International (CGI 2002), Bradford, UK,
July 2002.
People:
Dinesh Rathi, Gaurav Agarwal, Dipinder Sekhon, Anoop G, Subhajit Sanyal, Prem Kalra, Subhashis Banerjee.
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