Barcode technology originated in the twenties, and was born in the laboratories of Westinghouse.

That time each conceived of electronic technology applications have made people feel very novelty. His idea is to print barcode labels on the envelope, information in the barcode is the recipient's address, just like zip code.

For this, Kermode invention the first bar code identification, the design is very simple, that a "strip" represents the number "1", two "bars" represents the number "2" inferior race, and so on. Then he invented the bar code reading device consisting of basic components. A scanner (capable of emitting light and receiving reflected light); one method which can measuring reflected signal of bars and spaces, called the edge coils positioned. Another method is use decoder.

Barcode labelsare 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.

The barcode inspection not only overcome the defects of traditional detection methods, but also has been developed to using the integrated bar code quality grading which called reflectivity curve analysis. Comprehensive grading method is based on scanning reflectivity curve. It can be referenced decoding algorithm analysis, judgment, and to appearance defect convert the defects. The test results given the level of the bar code symbol, indicating that the application occasions of the barcode labels.

Barcode technology is the based of POS systems, EDI, e-commerce, supply chain management, also a modern technical means for logistics management.