A barcode is a graphical identifier that arranges multiple black bars and blanks of varying widths according to a certain coding rule to express a set of information. The common barcode is a parallel line pattern composed of black bars (referred to as bars) and white bars (referred to as spaces) with significantly different reflectivity. Barcodes can indicate the country of production, manufacturer, product name, production date, book classification number, mail start and end locations, category, date, and many other information of an item. Therefore, they have been widely used in many fields such as commodity circulation, book management, postal management, and banking systems