Introduction: barcode (English: barcode) is a graphic identifier that arranges a plurality of black bars and blanks with different widths according to certain coding rules to express a group of information. Common bar codes are parallel lines arranged by black bars (referred to as bars) and white bars (referred to as spaces) with great differences in reflectivity

1. Materials required for applying for bar codes

A: A copy of the business license of an enterprise as a legal person is stamped with the official seal of the company;

B: product barcode application registration form;

C: an official fee of 1,88 yuan is required to apply for commodity bar code;

second, the recognition principle of bar code

to convert the bar code compiled according to certain rules into meaningful information, it needs to go through two processes: scanning and decoding. The color of an object is determined by the type of its reflected light. White objects can reflect visible light of various wavelengths, while black objects absorb visible light of various wavelengths. Therefore, when the light emitted by the light source of the barcode scanner is reflected on the barcode, the reflected light shines on the photoelectric converter inside barcode scanner, and the photoelectric converter converts it into corresponding electrical signals according to the reflected light signals with different intensities.