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Browsing Large Collections of Geo-Tagged Pictures
 

Browsing Large Collections of Geo-Tagged Pictures

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    Browsing Large Collections of Geo-Tagged Pictures Browsing Large Collections of Geo-Tagged Pictures Presentation Transcript

    • Browsing large collections of geo-tagged images Davide Carboni Valentina Marotto Pietro Zanarini
    • TOC Geo-referenced data Geo-tagged images Visualization of geo-tagged images Comparison between 3 apps Conclusions
    • Geo-reference Association between a piece of information and a place Geo-referenced information is a large part of whole on line information Geo-reference can be explicit (geo-tagging) or implicit Geo-reference can be at different levels (country, city, street, lat. and lon.)
    • “places” are everywhere
    • Extracting “where” from web pages the extraction of geographic terms from structured and, more challengingly, unstructured data; the identification and removal of ambiguities in such extraction procedures; Paris Hilton ambiguity
    • Explicit geo-reference Information is manually or automatically tagged with geographical data at the moment information is produced or published
    • Lat Lon in Exif
    • The growth of geo-tagged images 1,00E+08 1,00E+07 1,00E+06 geotagged images on Flickr 1,00E+05 1,00E+04 1,00E+03 2003 2004 2005 2006 2007 2008 2009
    • Summaries and Visualization
    • Summarization How to summarize a region with a single picture?
    • Summarization Difficult task Image analysis alone is poor at capturing semantic concepts of an image In multi user sets the popularity is used but the bias introduced by few photographers can induce to overestimate the importance of some objects
    • Summarization Conceptual framework1: A real point-of-interest is a point of accumulation for several photos A real point-of interest is of interest for many photographers and not only for few Textual tags if rarely found elsewhere are likely a symptom of some peculiarity of a place 1) Alexander Jaffe et al. Generating Summaries for Large Collections of Geo-Referenced Photographs
    • Panoramio
    • Panoramio Micro thumbnail Link ??
    • Google Maps
    • Still Panoramio
    • Flickr
    • Fractal View
    • Fractal View
    • The test Panoramio Vs. Flickr Maps Vs. Fractal View Test the usability Test by interviews and eye-tracking Task: find 10 POI to collect in a favorite list Number of Testers=10
    • 1/length
    • 3 different ways Panoramio: gaze continuously moves from map controls to thumbnails and vice versa Flickr: select a cluster and then browse (loosing geographical details) Fractal View: select a bounding box and browse, pictures are tiled with geographical constraints and move picture-by-picture
    • Conclusion Geo-tagged items are growing with exponential pace Summarizing and visualizing large collections of geo-tagged objects is an open issue. Mobile devices equipped with GPS and compass are a test bench for new interaction design solutions
    • Acknowledgement Work part of Geoweb & Mobile Lab CRS4, in collaboration with DistrICT, UniCA, UniSS, Sardegna Ricerche