Broad Area Colloquium For AI-Geometry-Graphics-Robotics-Vision

Mosaicing Impossible New Views

Shmuel Peleg
School of Computer Science and Engineering
Hebrew University Monday, April 14, 2003, 4:15PM
TCSeq 200


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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