How to make auto detection from the screen?

Question

Python

Good afternoon everyone
I wanted to ask you how to make an auto-determiner program in python34, i.e. I drew (entered) the number 1, 2 or 3 in the "paint", he reads this image from the screen and writes 1, 2 or 3. What should be read? What libraries to use?

Answer 1

opencv

Answer 2

In my opinion, if performance is not critical and "on the knee" implementation is sufficient, linux OS with any text recognition console program + os library is enough (for taking a "screenshot" of the screen and further recognition).

Answer 3

Neural networks. PyBrain.