Not necessarily an authentic product.

Bar codes can indicate the country of production, manufacturer, product name, production date, book classification number, starting and ending location of the mail, category, date and many other information. Therefore, they are widely used in commodity circulation, library management, and postal management. It is widely used in many fields such as , banking system, etc., but it is not possible to know the authenticity of the product.

Identification principle:

The barcode symbol is an information symbol composed of "bars" and "spaces" with different reflectivities according to certain coding rules. Since the "bars" and "spaces" in the barcode symbol have different reflectivities for light, the barcode scanner receives reflected light signals of different strengths and correspondingly generates electrical pulses with different potentials. The width of the "bar" and "space" in the barcode symbol determines the length of the electrical pulse signal with different potentials.

The optical signal received by the scanner needs to be photoelectrically converted into an electrical signal and amplified by an amplification circuit. Due to the certain size of the scanning light spot, the edge ambiguity during barcode printing and some other reasons, the barcode electrical signal amplified by the circuit is a smooth fluctuating signal, which is called an "analog electrical signal". "Analog electrical signals" need to be shaped into ordinary "digital signals". According to the encoding rules corresponding to the code system, the decoder can read and translate the "digital signal" into digital and character information.

Reference for the above content: Baidu Encyclopedia-Barcode