I've seen similar systems, such as "Which one of these four images is a puppy?". I think the problem is that the set has to be small, so it ends up being a multiple choice quiz. With one correct answer out of four or five choices, it is very easy to brute force.
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I've seen similar systems, such as "Which one of these four images is a puppy?". I think the problem is that the set has to be small, so it ends up being a multiple choice quiz. With one correct answer out of four or five choices, it is very easy to brute force.
The ones I've seen don't ask you to identify one single puppy. They ask you to identify all the puppies, making it rather harder to brute force:
http://thepcspy.com/read/the_cutest_humantest_kittenauth/
http://research.microsoft.com/en-us/um/redmond/projects/asir...