Tue Jul 05 10:57:19 CST 2022
The QR code is scanned every day. Do you know its technical principle? The QR code is scanned every day. Do you know its technical principle?
QR code has become an indispensable part of our daily life. You need to scan the QR code when logging in, when paying for things, and when signing in for meetings. What is the principle behind such a widely used QR code technology? This paper will analyze the technical principles behind QR code based on its development and typical application scenarios.
A brief history of QR code development
2.1 the birth of bar code
Before we understand the principle of two-dimensional code technology, let's take a brief look at how it developed. As early as 1948, Bernard salvo was a graduate student at the Philadelphia Institute of gas technology. By chance, he learned that the owner of a local supermarket wanted the dean to help design a device that could scan commodity prices to improve the efficiency of commodity sales in the supermarket. Because the cashier in the supermarket needs to enter the structure manually every time when settling the goods, the cashier's settlement efficiency is very low when the overtime passenger flow reaches. But the Dean thought it was a very difficult thing to do.
However, Bernard selver and his friend Joseph woodland thought it was a huge business opportunity and decided to design a commercially viable product. After trying the scheme of ultraviolet irradiation graphite luminescence, blind spot system and dot line symbol system, they were not widely used due to the technical limitations at that time.
In the blink of an eye, in the 1960s, woodland never gave up the golden idea that did not realize commercial application in those years. At this time, he was already an engineer of IBM. During his stay in the company, he constantly expounded his ideas on the technical implementation of bar code, and his colleagues constantly emphasized the commercial value of bar code. At the same time, lasers and computers have been applied, and the technical foundation of bar code implementation has been completed. About 1969, woodland participated in the supermarket scanner and label research project team invested by IBM, which was headed by George laurel. After several years of painstaking research, IBM finally launched a recognizable bar code.
On June 26th, 1974, the world's first barcode scanner was installed in marsh supermarket in Troy, Ohio. The first item scanned was 10 packs of Wrigley's juicy fruit flavored gum, which has now been collected by the American Museum of history. Then, barcode is widely used in commodities, books, postal and other systems, which greatly improves the efficiency of business operation.