Difference between revisions of "Main Page"

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<Big>'''Computer Vision Student Seminar'''</Big>
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<Big>'''Computer Vision Student Seminars'''</Big>
  
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The Computer Vision Student Seminar at the University of Maryland College Park is a student-run series of talks given by current graduate students for [http://www.cfar.umd.edu/cvl/meetthe.html#Graduate current graduate students].
+
The Computer Vision Student Seminars at the University of Maryland College Park are a student-run series of talks given by [http://www.cfar.umd.edu/cvl/meetthe.html#Graduate current graduate students] for [http://www.cfar.umd.edu/cvl/meetthe.html#Graduate current graduate students].
  
 +
To receive regular information about the Computer Vision Student Seminars, subscribe to our [https://mailman.cs.umd.edu/mailman/listinfo/cvss mailing list] or our [http://talks.cs.umd.edu/lists/12 talks list].
  
 
==Description==
 
==Description==
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* Encourage interaction between computer vision students;
 
* Encourage interaction between computer vision students;
−
 
 
* Provide an opportunity for computer vision students to be aware of and possibly get involved in the research their peers are conducting;
 
* Provide an opportunity for computer vision students to be aware of and possibly get involved in the research their peers are conducting;
−
 
 
* Provide an opportunity for computer vision students to receive feedback on their current research;
 
* Provide an opportunity for computer vision students to receive feedback on their current research;
−
 
 
* Provide speaking opportunities for computer vision students.
 
* Provide speaking opportunities for computer vision students.
  
−
 
+
The guidelines for the format are:
−
==Format==
 
  
 
* An hour-long weekly meeting, consisting of one 20-40 minute talk followed by discussion and food.   
 
* An hour-long weekly meeting, consisting of one 20-40 minute talk followed by discussion and food.   
Line 23: Line 20:
 
* Topics may include current research, past research, general topic presentations, paper summaries and critiques, or anything else beneficial to the computer vision graduate student community.
 
* Topics may include current research, past research, general topic presentations, paper summaries and critiques, or anything else beneficial to the computer vision graduate student community.
  
 +
==Schedule Fall 2015==
 +
 +
All talks take place on Thursdays at 3:30pm in AVW 3450.
 +
 +
{| class="wikitable" cellpadding="10" border="1" cellspacing="1"
 +
|-
 +
! Date
 +
! Speaker
 +
! Title
 +
|-
 +
| December 3
 +
| Angjoo Kanazawa
 +
| Learning 3D Deformation of Animals from 2D Images
 +
|-
 +
| December 10
 +
| Xintong Han
 +
| Automated Event Retrieval using Web Trained Detectors
 +
|}
 +
 +
==Talk Abstracts Spring 2015==
 +
 +
 +
===Learning 3D Deformation of Animals from 2D Images===
 +
Speaker: [http://www.umiacs.umd.edu/~kanazawa/ Angjoo Kanazawa] -- Date: December 3, 2015
 +
 +
Abstract: Understanding how an animal can deform and articulate is essential for a realistic modification of its 3D model. In this paper, we show that such information can be learned from user-clicked 2D images and a template 3D model of the target animal. We present a volumetric deformation framework that produces a set of new 3D models by deforming a template 3D model according to a set of user-clicked images. Our framework is based on a novel locally-bounded deformation energy, where every local region has its own stiffness value that bounds how much distortion is allowed at that location. We jointly learn the local stiffness bounds as we deform the template 3D mesh to match each user-clicked image. We show that this seemingly complex task can be solved as a sequence of convex optimization problems. We demonstrate the effectiveness of our approach on cats and horses, which are highly deformable and articulated animals. Our framework produces new 3D models of animals that are significantly more plausible than methods without learned stiffness.
 +
 +
Link: [http://arxiv.org/pdf/1507.07646v1.pdf paper]
 +
 +
===Automated Event Retrieval using Web Trained Detectors===
 +
 +
Speaker: [http://www.umiacs.umd.edu/~xintong/ Xintong Han] -- Date: December 10, 2015
  
−
==Subscribe to the Mailing List==
+
Abstract: Complex event retrieval is a challenging research problem, especially when no training videos are available. An alternative to collecting training videos is to train a large semantic concept bank a priori. Given a text description of an event, event retrieval is performed by selecting concepts linguistically related to the event description and fusing the concept responses on unseen videos. However, defining an exhaustive concept lexicon and pre-training it requires vast computational resources. Therefore, recent approaches automate concept discovery and training by leveraging large amounts of weakly annotated web data. Compact visually salient concepts are automatically obtained by the use of concept pairs or, more generally, n-grams. However, not all visually salient n-grams are necessarily useful for an event query - some combinations of concepts may be visually compact but irrelevant--and this drastically affects performance. We propose an event retrieval algorithm that constructs pairs of automatically discovered concepts and then prunes those concepts that are unlikely to be helpful for retrieval. Pruning depends both on the query and on the specific video instance being evaluated. Our approach also addresses calibration and domain adaptation issues that arise when applying concept detectors to unseen videos. We demonstrate large improvements over other vision based systems on the TRECVID MED 13 dataset.
  
−
To receive regular information about the Computer Vision Student Seminar, subscribe to the mailing list by following the instructions [https://mailman.cs.umd.edu/mailman/listinfo/cvss here].
+
Link: [http://arxiv.org/pdf/1509.07845v1.pdf paper]
  
 +
==Past Semesters==
 +
* [[Cvss:Spring2015| Spring 2015]]
 +
* [[cvss fall2014|Fall 2014]]
 +
* [[cvss_spring2014|Spring 2014]]
 +
* [[cvss_fall2013|Fall 2013]]
 +
* [[cvss_summer2013|Summer 2013]]
 +
* [[cvss_spring2013|Spring 2013]]
 +
* [[cvss_fall2012|Fall 2012]]
 +
* [[cvss_spring2012|Spring 2012]]
 +
* [[cvss_fall2011|Fall 2011]]
 +
* [[cvss_summer2011|Summer 2011]]
  
−
==Schedule Summer 2011==
+
==Funded By==
 +
* Computer Vision Faculty
 +
<!-- * '''[http://www.northropgrumman.com/ Northrop Grumman]''' -->
  
−
All talks take place Thursdays at 4pm in AVW 3450.
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==Current Seminar Series Coordinators==
  
−
{| class="wikitable" cellpadding="10" border="1" cellspacing="0"
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Emails are at umiacs.umd.edu.
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|-
+
 
−
|Date
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{| cellpadding="1"
−
|Speaker
 
−
|Title
 
 
|-
 
|-
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| June 9
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| [http://sites.google.com/site/austinomyers/ Austin Myers], amyers@
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| Vlad Morariu
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| (student of [http://www.cfar.umd.edu/~yiannis/ Professor Yiannis Aloimonos])
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| Multi-Agent Event Recognition in Structured Scenarios
 
 
|-
 
|-
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| June 16
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| [http://www.umiacs.umd.edu/~kanazawa/ Angjoo Kanazawa], kanazawa@
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| Ajay Mishra
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| (student of [http://cs.umd.edu/~djacobs/ Professor David Jacobs])
−
|  
 
 
|-
 
|-
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| June 23
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| [http://sites.google.com/site/yechengxi/ Chenxi Ye] cxy@
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| (no meeting, CVPR)
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| (student of [http://www.cfar.umd.edu/~yiannis/ Professor Yiannis Aloimonos])
−
|
 
 
|-
 
|-
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| June 30
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| [http://www.umiacs.umd.edu/~xintong/ Xintong Han], xintong@
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| Dikpal Reddy
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| (student of [http://www.umiacs.umd.edu/~lsd/ Professor Larry Davis])
−
|  
 
 
|-
 
|-
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| July 7
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| [http://www.cs.umd.edu/~bharat/ Bharat Singh], bharat@
−
| Raghuraman Gopalan
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| (student of [http://www.umiacs.umd.edu/~lsd/ Professor Larry Davis])
−
|
 
 
|-
 
|-
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| July 14
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| [http://bcsiriuschen.github.io/ Bor-Chun (Sirius) Chen], sirius@
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|  
+
| (student of [http://www.umiacs.umd.edu/~lsd/ Professor Larry Davis])
−
|
+
|}
 +
 
 +
Gone but not forgotten.
 +
{| cellpadding="1"
 
|-
 
|-
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| July 21
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| [http://www.umiacs.umd.edu/~jhchoi/ Jonghyun Choi], jhchoi@
−
| Kaushik Mitra
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| (student of [http://www.umiacs.umd.edu/~lsd/ Professor Larry Davis])
−
|
 
 
|-
 
|-
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| July 28
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| Ching-Hui Chen, ching@
−
| Carlos Castillo
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| (student of [http://www.umiacs.umd.edu/~rama/ Professor Rama Chellappa])
 
|
 
|
 
|-
 
|-
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| August 4
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| [http://ravitejav.weebly.com/ Raviteja Vemulapalli], raviteja @
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|
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| (student of [http://www.umiacs.umd.edu/~rama/ Professor Rama Chellappa])
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|
 
−
|-
 
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| August 11
 
−
|
 
−
|
 
 
|-
 
|-
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| August 18
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| [http://www.umiacs.umd.edu/~sameh/ Sameh Khamis]
 
|  
 
|  
−
|
 
 
|-
 
|-
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| August 25
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| [http://www.umiacs.umd.edu/~ejaz/ Ejaz Ahmed]
 
|  
 
|  
−
|
 
−
|}
 
−
 
−
 
−
==Talk Abstracts==
 
−
 
−
====Multi-Agent Event Recognition in Structured Scenarios====
 
−
Speaker: Vlad Morariu -- Date: June 9, 2011
 
−
 
−
I will present a framework for the automatic recognition of complex multi-agent events in settings where structure is imposed by rules that agents must follow while performing activities.  Given semantic spatio-temporal descriptions of what generally happens (i.e., rules, event descriptions, physical constraints), and based on video analysis, the framework determines the events that occurred.  Knowledge about spatio-temporal structure is encoded using first-order logic using an approach based on Allen's Interval Logic, and robustness to low-level observation uncertainty is provided by Markov Logic Networks (MLN).  The main contribution is that the framework integrates interval-based temporal reasoning with probabilistic logical inference, relying on an efficient bottom-up grounding scheme to avoid combinatorial explosion. Applied to one-on-one basketball, the framework detects and tracks players, their hands and feet, and the ball, generates event observations from the resulting trajectories, and performs probabilistic logical inference to determine the most consistent sequence of events.
 
−
 
−
 
−
 
−
 
−
==Current Seminar Series Coordinators==
 
−
 
−
Emails are at umiacs.umd.edu.
 
−
 
−
{| class="wikitable" cellpadding="5"
 
 
|-
 
|-
−
| Anne Jorstad, jorstad@
+
| [http://cvlabwww.epfl.ch/~jorstad/ Anne Jorstad]
−
| (student of Professor David Jacobs)
+
| now at EPFL
 
|-
 
|-
−
| Sameh Khamis, sameh@
+
| [http://www.umiacs.umd.edu/~jni/ Jie Ni]
−
| (student of Professor Larry Davis)
+
| now at Sony
 
|-
 
|-
−
| Sima Taheri, taheri@
+
| [http://www.umiacs.umd.edu/~taheri/ Sima Taheri]
−
| (student of Professor Rama Chellappa)
+
|  
 
|-
 
|-
−
| Ching Lik Teo, cteo@
+
| [http://www.umiacs.umd.edu/~cteo/ Ching Lik Teo]
−
| (student of Professor Yiannis Aloimonos)
+
|  
 
|}
 
|}
−
 
−
 
−
== Wiki Editing ==
 
−
 
−
Consult the [http://meta.wikimedia.org/wiki/Help:Contents User's Guide] for information on using the wiki software.
 
−
 
−
* [http://www.mediawiki.org/wiki/Help:Configuration_settings Configuration settings list]
 
−
* [http://www.mediawiki.org/wiki/Help:FAQ MediaWiki FAQ]
 
−
* [http://mail.wikimedia.org/mailman/listinfo/mediawiki-announce MediaWiki release mailing list]
 

Latest revision as of 23:40, 3 December 2015

Computer Vision Student Seminars

The Computer Vision Student Seminars at the University of Maryland College Park are a student-run series of talks given by current graduate students for current graduate students.

To receive regular information about the Computer Vision Student Seminars, subscribe to our mailing list or our talks list.

Description[edit]

The purpose of these talks is to:

  • Encourage interaction between computer vision students;
  • Provide an opportunity for computer vision students to be aware of and possibly get involved in the research their peers are conducting;
  • Provide an opportunity for computer vision students to receive feedback on their current research;
  • Provide speaking opportunities for computer vision students.

The guidelines for the format are:

  • An hour-long weekly meeting, consisting of one 20-40 minute talk followed by discussion and food.
  • The talks are meant to be casual and discussion is encouraged.
  • Topics may include current research, past research, general topic presentations, paper summaries and critiques, or anything else beneficial to the computer vision graduate student community.

Schedule Fall 2015[edit]

All talks take place on Thursdays at 3:30pm in AVW 3450.

Date Speaker Title
December 3 Angjoo Kanazawa Learning 3D Deformation of Animals from 2D Images
December 10 Xintong Han Automated Event Retrieval using Web Trained Detectors

Talk Abstracts Spring 2015[edit]

Learning 3D Deformation of Animals from 2D Images[edit]

Speaker: Angjoo Kanazawa -- Date: December 3, 2015

Abstract: Understanding how an animal can deform and articulate is essential for a realistic modification of its 3D model. In this paper, we show that such information can be learned from user-clicked 2D images and a template 3D model of the target animal. We present a volumetric deformation framework that produces a set of new 3D models by deforming a template 3D model according to a set of user-clicked images. Our framework is based on a novel locally-bounded deformation energy, where every local region has its own stiffness value that bounds how much distortion is allowed at that location. We jointly learn the local stiffness bounds as we deform the template 3D mesh to match each user-clicked image. We show that this seemingly complex task can be solved as a sequence of convex optimization problems. We demonstrate the effectiveness of our approach on cats and horses, which are highly deformable and articulated animals. Our framework produces new 3D models of animals that are significantly more plausible than methods without learned stiffness.

Link: paper

Automated Event Retrieval using Web Trained Detectors[edit]

Speaker: Xintong Han -- Date: December 10, 2015

Abstract: Complex event retrieval is a challenging research problem, especially when no training videos are available. An alternative to collecting training videos is to train a large semantic concept bank a priori. Given a text description of an event, event retrieval is performed by selecting concepts linguistically related to the event description and fusing the concept responses on unseen videos. However, defining an exhaustive concept lexicon and pre-training it requires vast computational resources. Therefore, recent approaches automate concept discovery and training by leveraging large amounts of weakly annotated web data. Compact visually salient concepts are automatically obtained by the use of concept pairs or, more generally, n-grams. However, not all visually salient n-grams are necessarily useful for an event query - some combinations of concepts may be visually compact but irrelevant--and this drastically affects performance. We propose an event retrieval algorithm that constructs pairs of automatically discovered concepts and then prunes those concepts that are unlikely to be helpful for retrieval. Pruning depends both on the query and on the specific video instance being evaluated. Our approach also addresses calibration and domain adaptation issues that arise when applying concept detectors to unseen videos. We demonstrate large improvements over other vision based systems on the TRECVID MED 13 dataset.

Link: paper

Past Semesters[edit]

Funded By[edit]

  • Computer Vision Faculty

Current Seminar Series Coordinators[edit]

Emails are at umiacs.umd.edu.

Austin Myers, amyers@ (student of Professor Yiannis Aloimonos)
Angjoo Kanazawa, kanazawa@ (student of Professor David Jacobs)
Chenxi Ye cxy@ (student of Professor Yiannis Aloimonos)
Xintong Han, xintong@ (student of Professor Larry Davis)
Bharat Singh, bharat@ (student of Professor Larry Davis)
Bor-Chun (Sirius) Chen, sirius@ (student of Professor Larry Davis)

Gone but not forgotten.

Jonghyun Choi, jhchoi@ (student of Professor Larry Davis)
Ching-Hui Chen, ching@ (student of Professor Rama Chellappa)
Raviteja Vemulapalli, raviteja @ (student of Professor Rama Chellappa)
Sameh Khamis
Ejaz Ahmed
Anne Jorstad now at EPFL
Jie Ni now at Sony
Sima Taheri
Ching Lik Teo

Web Accessibility

Retrieved from "https://wiki.cs.umd.edu/cvss/w/index.php?title=Main_Page&oldid=1868"