[Colloquium] Reminder: Naderi Parizi/MS Presentation/Feb 10, 2012

[Margaret Jaffey]

Please Note: Sobhan's MS Presentation today will begin 15 minutes
later than originally scheduled (start time of 2:15 instead of 2:00).
This announcement shows the revised start time.

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Date:  Friday, February 10, 2012

Time:  2:15 PM

Place:  Ryerson 276

M.S. Candidate:  Sobhan Naderi Parizi

M.S. Paper Title: Image Classification with Reconfigurable Spatial
Structures

Abstract:
We propose a new latent variable model for scene recognition. Our
approach represents a scene as a collection of region models (“parts”)
arranged in a reconfigurable pattern. We partition an image into a
pre-defined set of regions and use a latent variable to specify which
region model is assigned to each image region. In our current
implementation we use a bag of words representation to capture the
appearance of an image region. The resulting method generalizes a
spatial bag of words approach that relies on a fixed model for the bag
of words in each image region. Our models can be trained using both
generative and discriminative methods. In the generative setting we
use the Expectation-Maximization (EM) algorithm to estimate model
parameters from a collection of images with category labels. In the
discriminative setting we use a latent structural SVM (LSSVM). We note
that LSSVMs can be very sensitive to initialization and demonstrate
that generative training with EM provides a good initialization for
discriminative training with LSSVM.

Sobhan's advisor is Prof. Pedro Felzenszwalb

Login to the Computer Science Department website for details:
 https://www.cs.uchicago.edu/phd/ms_announcements#sobhan

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Margaret P. Jaffey            margaret at cs.uchicago.edu
Department of Computer Science
Student Support Rep (Ry 156)               (773) 702-6011
The University of Chicago      http://www.cs.uchicago.edu
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