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Multiple SEmantic IMage CAPTCHA
Year: 2011
Abstract:
the upright orientation of warped image as a semantic. Multiple
SEIMCHA evaluates user based on the idea of almost right response instead of completely right response. This idea uses hardness rate concept which is defined based on user response rate...
SEIMCHA: A New Semantic Image CAPTCHA Using Geometric Transformations
Year: 2012
Abstract:
by eliminating the use of tags and relying on semantic visual concepts. In fact, recognition of upright orientation is used as a visual cue. The usability of the proposed approaches is verified using human subjects. An estimation of security is also obtained...