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Unformatted text preview: Appearing in Proc. Workshop on Representations of Visual Scenes, Cambridge MA, 1995. Physically-Valid View Synthesis by Image Interpolation
Steven M. Seitz Charles R. Dyer firstname.lastname@example.org email@example.com Department of Computer Sciences
University of Wisconsin
Madison, WI 53706
very successful in the entertainment industry, providing a simple mechanism capable of producing visually
appealing transformations from one image to another.
Despite the popularity of morphing techniques, little
attention has focused on the physical validity of the
In this paper, we investigate the feasibility of using image warping techniques for view synthesis. We
use the term view synthesis to refer to the rendering of
images of an observed object or scene from new viewpoints. A special case of view synthesis is view interpolation, which concerns the synthesis of a continuous
series of views starting at one known viewpoint and
ending at another. In the context of these de nitions,
the main result of this paper is that for a broad class of
scenes and images image interpolation is a physically valid mechanism for view interpolation.
This result provides a theoretical basis for morphing
techniques and demonstrates that views can be synthesized with simple 2D image operations. In addition, we
demonstrate constructively that, unlike 3D structure
recovery, view interpolation is well-posed and does not
su er from the aperture problem. The result depends
on an assumption of monotonicity which requires that
corresponding scene points appear in the same order
in both images.
Practical applications of view synthesis include virtual teleconferencing 1, 2 with limited network bandwidth. By using view synthesis at the receiving end,
di erent views of the participants can be synthesized
from a small number of transmitted views. View synthesis has also been used to create panoramic mosaic
images 3 . Several images of a scene can be combined
to create a single mosaic image by warping the images
to be consistent with a common viewpoint. An advantage of image-based view synthesis is that rendering
time is independent of scene complexity. This property can be exploited to speed up rendering of complex
scenes 4 .
The remainder of the paper is structured as follows:
Section 2 reviews related work in image-based view
synthesis. Section 3 describes the projection model
and relevant terminology. Section 4 formalizes the notion of view interpolation and proves that the problem is well-posed under a general visibility assumption.
The feasibility of using image interpolation for view in- Abstract Image warping is a popular tool for smoothly transforming one image to another. Morphing" techniques
based on geometric image interpolation create compelling visual e ects, but the validity of such transformations has not been established. In particular, does
2D interpolation of two views of the same scene produce a sequence of physically valid in-between views of
that scene? In this paper, we describe a simple image
recti cation procedure which guarantees that interpolation does in fact produce valid views, under generic
assumptions about visibility and the projection process.
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