The two-dimensional code is a portable data file with high density and high information content. It is an ideal means to realize the automatic storage and use of large capacity and high reliability information, such as certificates and cards, and can be read automatically by machines. In the 12th Five-Year plan of our Internet of things, we use the two-dimensional code, the electronic tag and the intelligent industrial data terminal as the three major sensing technologies of the Internet of things. Among them, the two-dimensional code, with outstanding technical advantages and high cost performance cost, ranks the three largest technology of perception. Because of its unique advantages, two-dimensional code has been popularized in many applications. * the two-dimensional code is more than ten times the information capacity of the ordinary bar code, and it can contain 1848 alphabetic characters or 2729 digit characters, and about 500 Chinese character information. And more comp...
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