.. humans can help the poor bastards out .. ;)
Some people are afraid computers might take over the world some day, but before that they'd need to be able to distinguish different objects from each other ;) ..
As I mentioned in
my thesis, automated Computer Based Image Recognition - for indexing images in order to be able to do automated searches in large image collections - is nice, very nice .. But it is not working perfectly .. bar far ..
An example is the process of digitizing books. The scans might be un-'read'-able by the computer when people have written between lines or underlined / stroke through pieces of text for example ..
Other than that sometimes we want to be sure that a person actually enters data, instead of an automated script .. This is done by using captchas (Completely Automated Public Turingtest to tell Computers and Humans Apart) - found in many weblog comments forms or application forms for free services .. Before a form can be submitted, the image of a piece of deformed/scrambled text needs to be typed in .. People can only do this properly, hence the submitted form is truly filled in by a human ..
A group of programmers at the Carnegie Mellon University (Yes, the Lycos people) thought of combining the two 'problems' above with ReCaptcha .. Instead of just using a randomly generated words for captchas, they combine these with scans from books that could not have been interpreted by a computer for digitization .. After three similar results the word is considered to be 'decoded' ..
Source:
Humans helping out book scanners, Smartmobs.com