The two-dimensional code we have long been familiar with can not be familiar, and now a lot of partners see the two-dimensional code would like to take out their hands to sweep, maybe there is really a surprise.

And now we're all used to paying merchants by scanning QR codes, which is really very convenient.

The QR code has y invaded our lives, into our lives, but partners, you know how the QR code is generated? Qingdao North Youth Bird / suggested not know on a good look at the following! 1, two-dimensional barcode concept two-dimensional barcode / two-dimensional barcode (2-dimensionalbarcode) is a specific geometric pattern according to certain laws in the plane (two-dimensional direction) distribution of black and white graphic record data symbols information; in the code compilation on the clever use of the internal logic of the computer constituting the basis of the It has some ** of barcode technology: each code system has its own specific character set; each character occupies a certain width; it has a certain checksum function.

At the same time, it also has the function of automatic identification of different lines of information, and the processing of graphic rotation change point.

2, two-dimensional code classification two-dimensional code is a more advanced than one-dimensional code bar code format.

One-dimensional code can only express information in one direction (usually horizontal), while two-dimensional code can store information in both horizontal and vertical directions.

One-dimensional codes can only consist of numbers and letters, while two-dimensional codes can store information such as Chinese characters, numbers and pictures, making two-dimensional codes much more versatile.

A. Stacked/rowed type Its coding principle is based on 1D barcode, which is stacked into two or more rows as needed.

It inherits some features of 1D barcode in terms of coding design, checking principle, reading mode, etc. The reading equipment and barcode printing are compatible with 1D barcode technology.

But due to the increase in the number of rows, it is necessary to determine the rows, and its decoding algorithm and software are not exactly the same as that of 1D barcode.

The representative rows of 2D barcodes are: Code16K, Code49, PDF417, MicroPDF417, etc. B. Matrix 2D barcodes are encoded in a rectangular space through the different distributions of black and white pixels in the matrix.

In the corresponding element position of the matrix, the appearance of dots (square dots, round dots or other shapes) indicates the binary "1", the non-appearance of dots indicates the binary "0", the arrangement and combination of dots determines the meaning of the matrix two-dimensional bar code represents.

The matrix two-dimensional bar code is a new type of graphic symbols based on computer image processing technology, combination of coding principles, automatic reading and processing code system.

The representative matrix 2D barcodes are: CodeOne, MaxiCode, QRCode, DataMatrix, HanXinCode, GridMatrix and so on.