There is also a habit of scanning the QR code when paying merchants, which is very convenient.
Two-dimensional code has deeply invaded our life and become our life, but friends, do you know how two-dimensional code is produced? Shijiazhuang Beida Jade Bird/Suggest to have a good look at the following if you don't know! 1, the concept of 2-dimensionalbarcode records data symbol information on a plane (two-dimensional direction) with certain geometric figures distributed according to certain rules; 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 figures 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 the automatic processing of information: it has some characteristics of barcode technology: each code system has its own specific character set; Each character occupies a certain width; It has certain verification function.
At the same time, it also has the function of automatically identifying different line information and processing graphics rotation change points.
2. Two-dimensional code classification Two-dimensional code is a more advanced barcode format than one-dimensional code.
One-dimensional code can only express information in one direction (generally horizontal direction), while two-dimensional code can store information in both horizontal and vertical directions.
One-dimensional code can only be composed of numbers and letters, while two-dimensional code can store Chinese characters, numbers, pictures and other information, so the application field of two-dimensional code is much wider.
A. The principle of stacking/line-by-line coding is based on one-dimensional bar codes and stacked into two or more lines as required.
It inherits some characteristics of one-dimensional bar code in coding design, checking principle and reading mode, and the reading equipment is compatible with bar code printing and one-dimensional bar code technology.
However, due to the increase of the number of lines, it is necessary to judge the number of lines, and its decoding algorithm and software are not exactly the same as those of one-dimensional bar code.
Representative two-dimensional bar codes are: Code 16K, Code49, PDF4 17, microppdf 417, etc. B. Matrix two-dimensional code is coded in rectangular space through different distributions of black and white pixels in the matrix.
In the position of the corresponding element in the matrix, the binary "1" is represented by the appearance of points (squares, points or other shapes), and the binary "0" is represented by the absence of points. The arrangement and combination of points determine the meaning represented by matrix two-dimensional bar code.
Matrix two-dimensional bar code is a new coding system based on computer image processing technology and combined coding principle, which can automatically read and process graphic symbols.
Representative matrix QRCodes include: CodeOne, MaxiCode, QR code, DataMatrix, HanXinCode, GridMatrix, etc.