I need to detect and the check visual codes that I have designed as the below images
I will stick that visual code on sidewalks so user can read it by android real time camera view and depends on which dots blacked, takes act. Just like snapchat id but more simple as 24 different possibilty.
Its does not sound good to detect circles on view, so as a beginner how to make it in an effective way?
A Different Picture
And one more Different picture of the code