Google recently filed a patent that has now been published which targets to recognize text in images.
Some see news like this as a captcha killer.
Google foremost sees other opportunities:
Extracted image text can be stored for use an in image search application.
Additionally, in one implementation, the image is presented along with one or more advertisements. The advertisements can be selected based on the content of one or more search terms provided by the user.
This makes me believe that they will be content with reading "normal" text from images. Captcha texts are scrambled and the Google algorithm doesn't have to be that good to create revenue with Google Image Search...