Acctually , the barcode is divided into two categories，

1D and 2D Barcode

1D :UPCs, Code 39, ITF, Code 128,Code 93, ISBN code, and Codabar, and so on,

1D mean:1D Bar code is a set of rules arranged by the bar, empty and the corresponding character of the mark, “bar” refers to the low part of the light reflectivity, “empty” refers to the higher part of the light reflectivity, these bars and empty composition Of the data to express certain information, and can use a specific device to read, converted into computer-compatible binary and decimal information. Usually for each item, its coding is unique, for the ordinary one-dimensional bar code, but also through the database to establish a bar code and commodity information correspondence, when the bar code data spread to the computer, by the computer The application manipulates and processes the data.

2D:PDF417、QR Code、Code 49、Code 16K、Code One and so on,

2D mean: 2D barcode is a certain geometric graphics in accordance with a certain law in the plane (two-dimensional direction) distribution of black and white graphics data symbolic information; in the code to make use of the computer composition of the internal logic of the “0” , “1” bit stream concept, the use of a number of binary corresponding to the geometric shape to represent the text value information, through the image input device or photoelectric scanning device automatically read to achieve automatic information processing: it has some common bar code technology : Each code has its own specific character set; each character occupies a certain width; has a certain check function and so on. But also has a different line of information automatically identify the function, and deal with graphics rotation change point

and 2D is contain more information than 1D , and it can exist independent，and no need the basedata