A sigma-lognormal model for character level CAPTCHA generation.
Chetan RamaiahRejean PlamondonVenu GovindarajuPublished in: ICDAR (2015)
Keyphrases
- computational model
- mathematical model
- high level
- probabilistic model
- hybrid model
- formal model
- statistical model
- higher level
- cost function
- bayesian networks
- information systems
- process model
- prediction model
- real time
- artificial neural networks
- management system
- similarity measure
- artificial intelligence
- real world
- experimental data
- neural network