In the code compilation, the concept of "0" and "1" bit streams constituting the internal logic of the computer is skillfully utilized, and several geometric shapes corresponding to binary are used to represent the literal numerical information through the image input device or the photoelectric scanning device. Automatic reading for automatic processing of information. Among the many types of QR code anti-counterfeit labels, commonly used code systems are: Data Matrix, MaxiCode, Aztec, QR Code, Vericode, PDF417, Ultracode, Code 49, Code 16K, etc. QR Code is a Japanese DW company in 1994. invention. QR comes from the abbreviation of "Quick Response" in English, which means quick response. The inventor hopes that the QR code can make its content be decoded quickly. QR codes are most common in Japan and Korea; they are currently the most popular 2D space barcodes in Japan. However, the security of QR codes is also being challenged, with malware and viruses becoming a stumbling block on the road to the popularity of QR codes. The development and prevention of the abuse of QR codes is becoming an urgent problem to be solved.

Each code system has its own specific character set; each character occupies a certain width; it has a certain check function. At the same time, it also has the features of automatic identification of different lines of information and processing of graphic rotation changes.

The QR code security label is a more advanced barcode format than the one-dimensional code. One-dimensional codes can only express information in one direction (generally horizontal), while two-dimensional codes can store information in both horizontal and vertical directions. One-dimensional codes can only be composed of numbers and letters, while two-dimensional codes can store information such as Chinese characters, numbers and pictures. Therefore, the application fields of two-dimensional codes are much broader.

The 2D barcode/QR code can be divided into a stacked/row row 2D barcode and a matrix 2D barcode. The stacked/row row two-dimensional bar code is formed by stacking a plurality of short-cut one-dimensional bar codes; the matrix two-dimensional bar code is composed of a matrix, and the "point" is used to represent the binary "1" at the corresponding element position of the matrix. "," uses "empty" to represent the binary "0", "point" and "empty" arrangement of the code. [3] The principle of two-dimensional code can be described from the principle of matrix two-dimensional code and the principle of determinant two-dimensional code.