In coding, the concepts of "0" and "1" bit streams, which constitute the internal logic foundation of the computer, are skillfully used, and several geometric shapes corresponding to binary are used to represent the numerical information of characters, which can be automatically read by image input equipment or photoelectric scanning equipment to realize automatic information processing.

Strictly speaking, it doesn't matter from other places. Because QR code is a computer programming program, binary algorithm belongs to computer programming language, not mathematics.