An Image-Based CAPTCHA Using Sophisticated Mental Rotation.

Yuki Ikeya Masahiro Fujita Junya Kani Yuta Yoneyama Masakatsu Nishigaki

Published in: HCI (24) (2014)

Keyphrases

real world
rotation invariant
rotation and translation
neural network
computer vision
invariant features
mental states
image processing
three dimensional
log polar
human cognition