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Second, the principle of barcode recognition
To convert barcodes compiled according to certain rules into meaningful information, you need to go through two processes: scanning and decoding. The color of an object is determined by the type of light reflected. White objects can reflect visible light of various wavelengths, and black objects can absorb visible light of various wavelengths, so when the light emitted by the barcode scanner light source is reflected on the barcode, the reflected light The photoelectric converter inside the barcode scanner is irradiated, and the photoelectric converter is converted into a corresponding electrical signal according to the reflected light signals with different strengths. According to the difference in principle, the scanner can be divided into three types: light pen, CCD and laser. After the electrical signal is output to the amplified signal of the amplifier circuit of the barcode scanner, it is sent to the shaping circuit to convert the analog signal into a digital signal. The width of the white bar and the black bar are different, and the duration of the corresponding electrical signal is also different. The decoder then judges the number of bars and spaces by measuring the number of pulsed digital electrical signals 0,1. By measuring the duration of the 0, 1 signal to determine the width of the bar and the space. At this time, the data obtained is still messy. To know the information contained in the barcode, you need to replace the bar symbol with the corresponding number and character information according to the corresponding coding rules (for example: EAN-8 code). Finally, the computer system performs data processing and management, and the detailed information of the items is identified.