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Investigating CAPTCHAs Based on Visual Phenomena.
Anja B. Naumann
Thomas Franke
Christian Bauckhage
Published in:
INTERACT (2) (2009)
Keyphrases
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visual information
high level
visual representation
three dimensional
low level
visual data
databases
information retrieval
learning algorithm
computer vision
case study
image segmentation
visual features
visual appearance
visual exploration