A barcode is an optical machine-readable representation of data relating to the object to which it is attached. Originally barcodes systematically represented data by varying the widths and spacings of parallel lines, and may be referred to as linear or one-dimensional (1D). Later they evolved into rectangles, dots, hexagons and other geometric patterns in two dimensions (2D). Although 2D systems use a variety of symbols, they are generally referred to as barcodes as well. Barcodes originally were scanned by special optical scanners called barcode readers; later, scanners and interpretive software became available on devices including desktop printers and smartphones.

All barcode labels have are uniqueness. The same kind of specifications products should correspond to the same product codes. The same kind but different specifications product correspond to the different codes. According to the different nature of product, such as: weight, packing, specifications, smell, color，shape and so on. Barcode can give products the different commodity code.

Barcode labelscan allow for the organization of large amounts of data. They are widely used in the healthcare and hospital settings, ranging from patient identification (to access patient data, including medical history, drug allergies, etc.) to creating SOAP Notes with barcodes to medication management. They are also used to facilitate the separation and indexing of documents that have been imaged in batch scanning applications, track the organization of species in biology, and integrate with in-motion checkweighers to identify the item being weighed in a conveyor line for data collection.

Barcode labels are data carrier. It plays an important role in the information transmission. If the barcode has a problem, the item’s information communication will be interrupted, so it is necessary to control the barcode’s quality effectively, make sure the bar code symbol in the supply chain can be properly read. Barcode detection is an effective tool to achieve this goal. Bar code detection target is to check whether the bar code symbol is able to play its due role.