Open the mobile phone WeChat, click Me in the lower right corner, and click Pay. Find the epidemic prevention health code, enter the page, find the epidemic prevention health code and click. Click to view epidemic prevention and health code, and click to view epidemic prevention and health code in the window that opens. You can see the QR code of the finished vaccine. At this time, you can see the QR code of the finished vaccine on the opened page.
Two-dimensional code is also called two-dimensional bar code, and the common two-dimensional code is QR code, which means rapid response. It is a very popular coding method in mobile devices in recent years, which can store more information and represent more data types than traditional bar codes.
2-dimensional bar code is a kind of black-and-white figure which is distributed on a plane (two-dimensional direction) according to certain rules and records data symbol information. 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 shapes corresponding to binary are used to represent alphanumeric information.
Automatic information processing is realized by automatic reading of image input equipment or photoelectric scanning equipment: it has some characteristics of barcode technology: each coding system has its own specific character set; Each character occupies a certain width; Have certain inspection function, etc. At the same time, it also has the function of automatically identifying different line information and processing the rotation change points of graphics.