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Tel-Aviv University - Computer Science Colloquium

Sunday, April 2, 14:15-15:15
COFFEE at 14:00

Schreiber Building, Room 309
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Static, Dynamic and Transparent Structure From Motion

Shai Avidan

Microsoft Research

Abstract:

The problem of structure-from-motion (SFM) has been extensively explored.
Yet, most of the work seems to focus on the case of a camera moving in a
static, Lambertian 3D environment. Clearly, our world is much more
complicated than that and pushing the envelope of SFM algorithms is needed.
In this talk I will review some of the progress done in three complementing
areas of SFM. First, I will present a new method for recovering the
ego-motion of a camera moving in a static 3D world. This method takes
advantage of the relationships between affine and perspective projections
and is especially suited for dealing with video sequences. Then, I will
present a new method that can recover the 3D coordinates of moving objects
seen from a single moving camera. This problem can only be solved if some
constrains on the motion of the objects is placed. I coin the term
"trajectory triangulation" to describe this family of tasks and, in
particular, I focus on the case of objects that move along a straight line
or along a conic section. Finally, I will present a new approach to handle
reflections in 3D scenes. At its core, the new approach offers a new method
for decomposing reflections, seen by a moving camera, into the individual
layers that created them. Taken together, these contributions extend the
capabilities of SFM algorithms.

Parts of this work were done with P. Anandan, Amnon Shashua and Rick
Szeliski.
 

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For colloquium schedule, see http://www.math.tau.ac.il/~zwick/colloq.html