Asirra: a CAPTCHA that exploits interest-aligned manual image categorization.

Jeremy Elson John R. Douceur Jon Howell Jared Saul

Published in: CCS (2007)

Keyphrases

image categorization
multiple instance learning
visual features
image descriptors
data sets
object recognition
low level
machine learning
web pages
multiscale
reinforcement learning
semi supervised
image classification