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Directcha: A proposal of spatiometric mental rotation CAPTCHA.

Ayane SanoMasahiro FujitaMasakatsu Nishigaki
Published in: PST (2016)
Keyphrases
  • mental states
  • rotation angle
  • neural network
  • decision trees
  • invariant features
  • real world
  • e learning
  • feature vectors
  • multiresolution
  • rotation invariant
  • fourier domain
  • affine transform