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http://ssbkyh.com/works/fadtcha/ http://ssbkyh.com/works/fadtcha/

• pimlottc 12y ago
  Nice, a captcha to block colorblind users!
  • arjie 12y ago
    That's a subset of the objective. The objective is to detect all humans because they wouldn't spot the 'face' in the coloured circles. Whether or not it's coloured doesn't change that. Unless you're concerned about the rights of colour-blind computers for some reason.
    • pimlottc 12y ago
      Ha, oops, I guess I didn't read it closely enough. As someone who's partially colorblind, just seeing those dot patterns pisses me off... :P
• dreamlane 12y ago
  How do you know if the individual being tested doesn't see a face? You have to trust them when they say "no face here"... May as well just ask "are you human?"
• edwintorok 12y ago
  What if the computer just chooses a random rectangular region, or it always answers 'no face here'?