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What is a QR code?

QR codes are also known as QR codes. A common QR code is QR Code. The full name of QR is Quick Response, which is a coding method. It can store more information and represent more data types than traditional Bar Code barcodes. QR code/QR code (2-dimensional bar code) is a black and white figure that is distributed on the plane (in the two-dimensional direction) according to a certain rule, and records data symbol information; In terms of coding, the concepts of "0" and "1" bit streams that form the internal logic foundation of the computer are cleverly utilized, and several geometric shapes corresponding to binary are used to represent textual numerical information, and are automatically read through image input devices or photoelectric scanning devices to realize automatic information processing: it has some commonalities of bar code technology: each code system has its own specific character set; each character occupies a certain width; it has a certain verification function, etc. At the same time, it also has the function of automatically identifying information on different rows and processing graphic rotation change points.