© Copyright 2007 All Rights Reserved
Faculty Research Excellence Series
Sponsored by the OSU-Tulsa Library
Thursday, March 29, 2007 6:00 pm North Hall Room 150
A common type of CAPTCHA requires that the user type the letters of a distorted image, sometimes with the addition of an obscured sequence of letters or digits that appears on the screen.
This CAPTCHA of "smwm" obscures its message from computer interpretation by twisting the letters.
This somewhat more sophisticated CAPTCHA of
"wikipedia" adds more distortions as well as highlights,
shadows, and random line segments to thwart edge detection.