Two-dimensional bar code is not as important as you think. It is not an anti-counterfeiting code, so it can't verify the authenticity of goods.

Besides, two-dimensional bar code can be made on the Internet by itself, such as text, business cards, websites, etc.

2-dimensional bar code records data symbol information with a certain geometric figure distributed in black and white on a plane (two-dimensional direction) according to a certain rule. In coding, the concepts of "" and "1" bit streams, which constitute the internal logic foundation of a computer, are skillfully used, and several geometric shapes corresponding to binary systems are used to represent numerical information of characters, which can be automatically read by image input equipment or photoelectric scanning equipment to realize automatic information processing: it has some characteristics of bar code technology: each code system has its own specific character set; Each character occupies a certain width; It has certain verification function, etc. At the same time, it also has the function of automatically recognizing the information of different lines and processing the rotation change points of graphics.