37 search results - page 1 / 8 » Distortion Estimation Techniques in Solving Visual CAPTCHAs |
CVPR
2004
IEEE
15 years 1 months ago
2004
IEEE
Abstract-- This paper describes two distortion estimation techniques for object recognition that solve EZ-Gimpy and Gimpy-r, two of the visual CAPTCHAs ("Completely Automated ...
NIPS
2008
14 years 12 days ago
2008
CAPTCHAs are computer-generated tests that humans can pass but current computer systems cannot. CAPTCHAs provide a method for automatically distinguishing a human from a computer ...
WCRE
2008
IEEE
14 years 5 months ago
2008
IEEE
CAPTCHAs are automated Turing tests used to determine if the end-user is human and not an automated program. Users are asked to read and answer Visual CAPTCHAs, which often appear...
CHI
2005
ACM
14 years 28 days ago
2005
ACM
HIPs, or Human Interactive Proofs, are challenges meant to be easily solved by humans, while remaining too hard to be economically solved by computers. HIPs are increasingly used ...
CVPR
2011
IEEE
13 years 7 months ago
2011
IEEE
We present a simple, accurate, and flexible method to calibrate intrinsic parameters of a camera together with (possibly significant) lens distortion. This new method can work u...