Two-dimensional code is also called two-dimensional bar code. The common two-dimensional code is QR Code, and the full name of QR is Quick Response. It is a very popular encoding method on mobile devices in recent years. It can store more than traditional Bar Code. The information can also represent more data types.
Two-dimensional bar code/two-dimensional bar code (2-dimensional bar code) uses a certain geometric figure to record data symbol information in a black and white pattern distributed on a plane (two-dimensional direction) according to a certain rule; ingenious in coding Utilize the concept of "0" and "1" bit stream that constitute the internal logic of the computer, and use several geometric shapes corresponding to the binary system to represent the text value information, which can be automatically read by image input equipment or photoelectric scanning equipment. Automatic information processing: It has some common features of barcode technology: each code system has its own specific character set; each character occupies a certain width; it has certain verification functions, etc. At the same time, it also has the function of automatically identifying different lines of information, and processing graphics rotation change points.
How to recognize the QR code?
Two-dimensional code technology includes two-dimensional code analysis and two-dimensional code generation. Usually, the information that needs to be transmitted is transmitted in the form of two-dimensional code generation, so that a two-dimensional code decoder is required to recognize the information inside.
The two-dimensional code consists of two color blocks: black represents a binary "1", and white represents a binary "0". Among them, some fixed graphics are mixed in geometric graphics, which are invisible to the naked eye, such as positioning graphics and separators. The function of the positioning graphic is to determine the coordinates of the module in the two-dimensional code symbol, and the function of the separator is to separate the position detection graphic from the rest of the symbol.
For example, when an access control reader scans a two-dimensional code, the location of the information is first determined by the positioning graphics and the separator, and then the data information read is compared and verified for identity and authority.
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