15. The CAPTCHA system of claim 12 , wherein the processor is operative to: present a composite image including a plurality of different images separated by borders which are distorted or otherwise visually obfuscated.
12. A Completely Automated Public test to Tell Computers and Humans Apart (CAPTCHA) system, comprising: a database for storing annotated images, each image depicting a concept or object intended for human recognition; a processor for distorting the images; a display for presenting a distorted image to a user along with a separate list of annotations to choose from; and an input allowing a user to select the annotation that best corresponds to the distorted image.