What is the two - dimensional code
Popular interpretation :
a two - dimensional code is a specific format picture that can store information . Technical interpretation : A two - dimensional bar code , also known as a two - dimensional bar code , is used to record data symbol information of black and white phases distributed in a plane ( two - dimensional direction ) according to a certain rule with a certain geometric figure ; It has some commonalities of bar code technology : each code has its specific character set ; each character occupies a certain width ; it has certain checking function , etc . It also has the features of automatic recognition function of information of different rows , and the change of the rotation of the process . the two - dimensional bar code is formed by stacking a one - dimensional bar code which is short - cut by a plurality of lines ; a matrix type two - dimensional bar code is formed in the form of a matrix ; the binary " 1 " is represented by a " dot " in the position of the corresponding element of the matrix ; and the binary " 0 " is represented by " null " , and the code is formed by the arrangement of " point " and " null " . In the present tens of two - dimensional bar codes , the commonly used codes are : Data Matrix , Maxi Code , Aztec , QR Code , Vernon , PDF 417 , Ultracode , Code 49 , Code 16K , etc . The QR code is invented by Denso - Wave Company in Japan in 1994 . QR code comes from the abbreviation of " Quick Response " in English . The QR code is most commonly found in Japan and Korea ; and it is the most popular two - dimensional bar code in Japan .South Korea; and the most popular two-dimensional space bar code in Japan.