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Tuesday, July 12 • 10:31 - 12:00
Accuracy of User-Contributed Image Tagging in Flickr: A Natural Disaster Case Study

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Location: PSH (Professor Stuart Hall Building) - LG01, 
Goldsmiths, University of London, Building 2
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Contributors:
  • George Panteras, George Mason University, United States
  • Xu Lu, Arie Croitoru, George Mason University, United States
  • Andrew Crooks, George Mason University, United States
  • Anthony Stefanidis, George Mason University, United States

Social media platforms have become extremely popular during the past few years, presenting an alternate, and often preferred, avenue for information dissemination within massive global communities. Such user-generated multimedia content is emerging as a critical source of information for a variety of applications, and particularly during times of crisis. In order to fully explore this potential, there is a need to better assess, and improve when possible, the accuracy of such information. This paper addresses this issue by focusing in particular on image tagging (i.e. user-assigned annotation) in Flickr. We use as case study a natural disaster event (wildfire), and assess the accuracy of user-generated tags. Furthermore, we compare these data to the results of a content-based annotation approach in order to assess the potential performance of an alternative, user-independent, automated approach to annotate such imagery. Our results show that Flickr user annotations can be considered quite reliable (at the level of ~50%), and that using a spatially distributed training dataset for our content-based image retrieval (CBIR) annotation process improves the performance of the content-based image labeling (to the level of ~75%). 

Tuesday July 12, 2016 10:31 - 12:00
PSH (Professor Stuart Hall Building) - LG01 Goldsmiths University, Building 2

Attendees (6)