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GRASP Lab Seminar 2003-2004
July 7 (Wednesday), 2:00 PM, Levine Hall 307, hosted by Kostas Daniilidis.
Tomas
Pajdla
Czech Technical University, Prague
Non-central Cameras, Their Models, and Stereo Geometries
Abstract: Recently, a number of new and interesting image acquisition techniques appeared, e.g. pushbroom cameras, stereo panoramas, omnivergent mosaics, and spherical mosaics. These image acquisition techniques often acquire large number of images from a moving camera and then choose some pixels from each image to form a mosaic. Since the cameras move, the rays corresponding to individual pixels of the mosaics do not pass through one center of projection. Instead, they may be incident to, e.g., a line, a circle, or a sphere. Such mosaic can be so viewed as images taken by a non-central camera, a camera that does not have a center of projection.
The mosaics can be, and actually are, used to reconstruct scenes because they posses the important advantage compared to classical pinhole cameras that almost complete surrounding is seen from each viewpoint. However, the mosaic stereo geometry can be rather complicated, depending on the way the mosaic was acquired. Several non-central cameras and their geometry will be presented. Aplpications in stereo reconstruction and Image Based Rendering will be demonstrated.Biography: TBA
