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Multimedia Tools and Applications

, Volume 59, Issue 2, pp 441–462 | Cite as

Tag-based algorithms can predict human ratings of which objects a picture shows

  • Viktoria PammerEmail author
  • Barbara Kump
  • Stefanie Lindstaedt
Article

Abstract

Collaborative tagging platforms allow users to describe resources with freely chosen keywords, so called tags. The meaning of a tag as well as the precise relation between a tag and the tagged resource are left open for interpretation to the user. Although human users mostly have a fair chance at interpreting this relation, machines do not. In this paper we study the characteristics of the problem to identify descriptive tags, i.e. tags that relate to visible objects in a picture. We investigate the feasibility of using a tag-based algorithm, i.e. an algorithm that ignores actual picture content, to tackle the problem. Given the theoretical feasibility of a well-performing tag-based algorithm, which we show via an optimal algorithm, we describe the implementation and evaluation of a WordNet-based algorithm as proof-of-concept. These two investigations lead to the conclusion that even relatively simple and fast tag-based algorithms can yet predict human ratings of which objects a picture shows. Finally, we discuss the inherent difficulty both humans and machines have when deciding whether a tag is descriptive or not. Based on a qualitative analysis, we distinguish between definitional disagreement, difference in knowledge, disambiguation and difference in perception as reasons for disagreement between raters.

Keywords

Semantic annotation Image tagging behaviour Descriptive tags Flickr WordNet 

Notes

Acknowledgements

The Know-Center is funded within the Austrian COMET Program—Competence Centers for Excellent Technologies—under the auspices of the Austrian Federal Ministry of Transport, Innovation and Technology, the Austrian Federal Ministry of Economy, Family and Youth and by the State of Styria. COMET is managed by the Austrian Research Promotion Agency FFG.

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Viktoria Pammer
    • 1
    Email author
  • Barbara Kump
    • 2
  • Stefanie Lindstaedt
    • 1
  1. 1.Know-CenterGrazAustria
  2. 2.Knowledge Management Institute, Graz University of TechnologyTübingenGermany

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