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Gotta CAPTCHA 'Em All: A Survey of 20 Years of the Human-or-computer Dilemma.
Meriem Guerar
Luca Verderame
Mauro Migliardi
Francesco Palmieri
Alessio Merlo
Published in:
ACM Comput. Surv. (2022)
Keyphrases
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expectation maximization
years ago
expert systems
maximum likelihood
computer systems
human subjects
data sets
neural network
social networks
face recognition
gaussian mixture model
human activities
computer technology