(Barcode) is the width of a number of black bars and blank, according to a certain coding rules to express a set of information on the graphical identifier. Common bar code is a large difference in the reflectivity of the black bars (bar) and white bars (short) arranged in parallel lines pattern. The bar code can mark many items such as commodity circulation, library management, postal management, banking system, etc., and so on. The bar code can be used in many fields such as commodity circulation, book management, postal management, banking system and so on. Get a wide range of applications.