Image-based CAPTCHA generation system

  • US 7,929,805 B2
  • Filed: 01/30/2007
  • Issued: 04/19/2011
  • Est. Priority Date: 01/31/2006
  • Status: Active Grant
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First Claim
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1. A method of generating a Completely Automated Public test to Tell Computers and Humans Apart (CAPTCHA), comprising the steps of:

  • storing a database of images and annotations corresponding to the images, each image depicting a concept or object intended for human recognition;

    distorting at least one of the images, and presenting the distorted image on a computer display along with a separate list of words, one of which best annotates the distorted image; and

    assuming that the user of the computer is a human as opposed to a machine if the correct word is selected to annotate the distorted image.

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