CAPTCHaStar! A novel CAPTCHA based on interactive shape discovery.

Mauro Conti Claudio Guarisco Riccardo Spolaor

Published in: CoRR (2015)

Keyphrases

shape model
data mining
computer graphics
shape representation
knowledge discovery
virtual reality
image processing
shape analysis
shape descriptors
shape matching
shape features
similarity measure
three dimensional
image segmentation
vector field
prior information
neural network