Captcha with merging a number with real image

Question

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 )?

Answer 1

Google sources these Captcha images from Street View imagery. Direct quote from Google spokesperson:

We’re currently running an experiment in which characters from Street View images are appearing in CAPTCHAs. We often extract data such as street names and traffic signs from Street View imagery to improve Google Maps with useful information like business addresses and locations. Based on the data and results of these reCaptcha tests, we’ll determine if using imagery might also be an effective way to further refine our tools for fighting machine and bot-related abuse online.

source: techcrunch