What do you think of the popular QR code on the Internet? Seek details

Two-dimensional code/two-dimensional code (2dcode. QR code- abbreviated from quick response code.

The form of 2D code-the most widely known one) [1] records data symbol information with black and white graphics distributed on a plane (two-dimensional direction) 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 characteristics of automatically identifying different lines of information and dealing with the rotation and change of graphics. Among many kinds of two-dimensional bar codes, the commonly used coding systems are: data.

Keywords matrix, Maxi code, Aztec, QR code,

Verification code, PDF4 17, super code, code

49, code 16K, etc. Two-dimensional code was invented by Denso Wave Corporation of Japan in 1994. QR comes from the English word "Quick"

The abbreviation of "response" means quick response, which comes from the inventor's hope that the QR code can quickly decode its content. QR codes are the most common in Japan and South Korea. It is the most popular two-dimensional space bar code in Japan. [