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The QR code is different from the common barcode (one-dimensional code). It uses specific geometric figures to record data information on a plane (horizontal and vertical two-dimensional directions) according to certain rules. It looks like a double [banned word] shape alternately. A square maze.
The QR code has a large information capacity, which is dozens of times higher than that of ordinary barcodes. At the same time, the error rate of QR codes does not exceed one in ten million, which is much lower than ordinary barcodes. In addition, QR codes have a wide encoding range and can encode digitized information such as pictures, sounds, text, signatures, fingerprints, etc. They are easy to produce, low cost, and durable.
When we buy train tickets, we will find that there is also a QR code on the train ticket. Its main function is to record the identity information of the person who buys the ticket. Scanning the QR code on the ticket is to ensure that the passenger and the ticket are sufficient. People are the same person, and using QR codes for ticket sales and check-in can greatly improve traffic efficiency and prevent counterfeit tickets.
Nowadays, QR codes have been applied to various fields, and the functions of QR codes in different fields are also different. But they have a common feature, which is that they make our lives more convenient. This is also the meaning of the existence of QR codes.
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