Broad Area Colloquium For AI-Geometry-Graphics-Robotics-Vision
Mosaicing Impossible New Views
School of Computer Science and Engineering
Monday, April 14, 2003, 4:15PM
Most image rendering methods try to mimic real cameras by generating
images having the perspective projection. In contrast, a unique power of
image mosaicing is the ability to generate new views with "impossible"
projections which are not perspective. This can be done with mosaicing
methods that construct a panoramic mosaic image by stitching together
narrow strips, each strip taken from a different source image. A
different selection of strips gives a different mosaicing effect using
the same set of source images.
For example, given a sequence of source images from a camera moving
sideways, a set of mosaic images can be generated providing a virtual
walkthrough in the scene, including forward motion. And this is done
without recovering any 3D geometry and without calibration. In another
example, a set of full panoramic stereo views can be generated, even
though perspective cameras allow only a very narrow view for stereo images.
The power of mosaicing to generate such "impossible" views is a result
of the new family of projections that can be constructed. These
projections, the "Crossed Slits" projections, will be defined and
analyzed together with the appropriate mosaicing.
About the Speaker
Shmuel Peleg received the BSc degree in mathematics from The Hebrew
University of Jerusalem, Israel, in 1976 and the MSc and PhD degrees
in computer science from the University of Maryland, College Park, in
1978 and 1979, respectively. He has been a faculty member at the
Hebrew University of Jerusalem since 1980 and has held visiting
positions at the University of Maryland, New York University, and the
Sarnoff Corporation. His recent research interests include image motion
analysis and image mosaicing.
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