I have searched for captcha generation tools, but I could not find any tool which can generate the below captcha pictures.
You can seen these when you want to register on google. It uses a number merged on a real picture and produce a new real image picture. Do you know any tools that which can do this ?! By the way, what this is the name of this kind of captcha ( or image merging technique )?
Google sources these Captcha images from Street View imagery. Direct quote from Google spokesperson:
source: techcrunch