[Colloquium] CORRECTION

[Dawn Ellis]

***The Talk scheduled for Friday, January 24th will begin at Noon*

When:     Friday, January 24th at 12pm

Where:    TTIC, 6045 S Kenwood Avenue, 5th Floor, Room #526

Who:       George Papandreou, TTIC Faculty

Title:       Describing Images with Visual Dictionaries of Mini-Epitome
Patches

Abstract:

  A key modeling problem in computer vision is identifying elementary
``visual
  words'' that capture the appearance of small image patches and can be used
  as building blocks for describing the content of whole
  images. Hand-engineered features like SIFT or HOG are widely used for this
  task but are hard to visualize or generalize to new domains or tasks. I
will
  describe an alternative approach in which we learn a generative dictionary
  model for image patches in an unsupervised way from a large collection of
  images. A key novelty in the proposed model is the use of the epitome data
  structure, allowing it to explicitly account for position variability in
  image appearance. This flexibility significantly increases the capacity of
  the dictionary to accurately reconstruct images and support recognition
  tasks. For the task of image classification, I will describe both
  histogram-based and Fisher Vector-based descriptors building on the
epitomic
  representation and report promising results on the PASCAL VOC-07
benchmark.

  I will also describe work in progress, towards developing hierarchical
deep
  epitomic models for describing whole images. In particular, inspired by
the
  recent impressive results of deep neural networks on hard computer vision
  tasks, I will outline how we can stack multiple layers of epitomic patch
  models and train them by blending supervised and unsupervised objectives.

  Parts of this work are in collaboration with Liang-Chieh Chen and Alan
  Yuille at UCLA.


***************************************
Research at TTIC Seminar Series

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underway at the Institute. Every week a different TTIC faculty member will
present their research.  The lectures are intended both for students
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Speaker details can be found at: http://www.ttic.edu/tticseminar.php.

For additional questions, please contact David McAllester at
mcallester at ttic.edu

-- 
*Dawn Ellis*
Administrative Coordinator,
Bookkeeper
773-834-1757
dellis at ttic.edu

TTIC
6045 S. Kenwood Ave.
Chicago, IL. 60637
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