When its image-recognition software can't interpret a passage of aged or faded text, it further distorts the image and serves it up as a CAPTCHA. That means the project not only produces an enormous output of digitized records for preservation purposes--it also filters text to find far more difficult words for computers to recognize.

FORBES: Magazine Article

The CAPTCHA--that much-loathed image of distorted words and numbers found on some Web pages that users must type in order to create or access an account or post a message.

FORBES: Magazine Article

Some security researchers even believe that the CAPTCHA-breaking software was using Tesseract--an open source image recognition software sponsored by Google itself and used in its book-scanning projects--to recognize the distorted characters.

FORBES: Magazine Article