I'm planning on doing an project related to Augmented reality, which will be focusing on developing a calculator for the primary children. Therefore i will be using a set of cards(15) which will have numbers from 0-9 and the 4 operands(adding, subtraction , division and multiplication) together with a card that will symbolize the question mark. So the application will give the opportunity for the user to either ask a question or to give an answer to an equation using the set of cards. what is better to use, is it color detection or QR codes?
Any help given regarding this will be very helpful. Thanks in advance.