CSAIL Event Calendar: Previous Series

Variable-Aperture Photography

Speaker: Sam Hasinoff , University of Toronto
Date: December 18 2007
Time: 11:00AM to 12:00PM
Location: 32-D507
Host: Fredo Durand, MIT - CSAIL - Computer Graphics Group

Abstract:
In this talk I will describe three projects that harness the power
of variable-aperture photography -- capturing multiple photos by
manipulating basic lens controls such as aperture and focus. I will
show that by combining such photos, the information encoded in
defocus can be exploited to achieve a variety of goals.
First, I will describe a new method for computing highly detailed 3D
shape by controlling both the aperture and focus of a lens. This
method is particularly well-suited for scenes with high geometric
complexity, for which standard reconstruction methods can break down.
Second, I will show that we can exploit "aperture bracketing" -- a
one-button operation on most digital SLR's -- to allow refocusing
and other effects in post-capture, all with increased dynamic range.
To achieve this, we compute a layered scene model that
simultaneously accounts for defocus, high dynamic range exposure,
and noise in the input images.
Finally, I will talk about our current work on "light-efficient"
photography, whose goal is to capture photos with the desired level
of defocus in the shortest time possible.

Joint work with Kyros Kutulakos.


Bio:
Sam Hasinoff received the BSc degree in computer science from the
University of British Columbia in 2000. He is currently a PhD
candidate at the University of Toronto. In 2006, he received an
honorable mention for the Longuet-Higgins Best Paper Award at the
European Conference on Computer Vision. His interests include cross-
country skiing, spicy foods, and amateur photography.


- - -
If you are interested in meeting with Sam Hasinoff during his visit,
please contact Bryt Bradley with your availability.

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