John Comand, an eccentric inventor, wanted to sort postal documents automatically. At that time, every idea about the application of electronic technology was very novel.
His idea is to put a barcode on the envelope, and the information in the barcode is the address of the recipient, just like today's postal code. For this reason, Comand invented the earliest bar code recognition, and the design scheme is very simple, that is, one represents the number "1", two represents the number "2", and so on. Then, he invented a bar code reading device composed of basic components: scanner; A method for measuring the band and space of reflected signal, namely edge positioning coil; And a method of using the measurement result, namely a decoder.
Barcode or barcode is a graphic identifier that arranges several black bars and blanks with different widths according to certain coding rules to represent a group of information. Common bar codes are parallel lines composed of black bars (referred to as bars) and white bars (referred to as spaces) with great differences in reflectivity. Barcode can indicate the country of production, manufacturer, commodity name, production date, book classification number, starting and ending place, category and mailing date, so it has been widely used in many fields such as commodity circulation, book management, postal management, banking system and so on.
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Advantages of barcode
1, with strong reliability. The reading accuracy of bar code far exceeds manual recording, and an error will appear every 15000 characters on average.
2. High efficiency. The reading speed of bar code is very fast, which is equivalent to 40 characters per second.
3. Low cost. Compared with other automatic identification technologies, bar code technology only needs a small sticker and a relatively simple optical scanner, and the cost is quite low.
4, easy to manufacture. Bar code writing is very simple, just need to print, so it is called "printable computer language".
5, the operation is simple. Bar code recognition equipment is simple in structure and convenient to use.
6. Flexible and practical. Bar code symbols can be input by manual keyboard, can also be combined with related equipment to realize automatic identification, and can also be linked with other control equipment to realize automatic management of the whole system.
Baidu encyclopedia-barcode
Baidu Encyclopedia-Commodity Barcode