Is same specific format of bill or invoice (1 format, really simple).
Should take picture from camera, and detect some fields.
Price, name of seller, time of sale, items, all information, variables, and details of it. Example
Price = $34.456
Seller = Carlos
I attach many examples should works in all examples (same format).
Should work, in all android phones, should be compatible, and not generated any crash.
Should work in any light condition, and take all information well. Writing information is in spanish.