Bar Coding 2
The concept of bar code technology was first visualized in the United States around the late 1960s, as a method of automating data collection into the computer system industry. It was retail applications, which drove the early technological developments of bar coding with industrial applications soon following. As computer systems became more advanced, bar codes became even more prevalent in our society.1 Now bar codes and barcode readers are being used in every industry. ...
Bar codes provide a simple and inexpensive method of encoding text information that is easily read by inexpensive electronic readers. ... The primary purpose of a bar code is to identify something by labeling the item with a bar code containing a unique number or character string. A bar code consists of a series of parallel, adjacent bars and spaces, much like the dots and dashes of Morse code. Predefined bar and space patterns known as "symbologies" are used to encode small strings of character data into a printed symbol, much as an alphabet specifies a pattern of lines for each letter.2 These unique patterns are added together, as letters are grouped to form words, and the result is a complete bar code. A bar code reader is then used to decode the bar code by scanning a light source across the bar code and measuring the intensity of light reflected back by the white spaces. This pattern of reflected light is detected with a photodiode, which produces an electronic signal that exactly matches the printed bar code pattern. ... Bar codes are typically used with a database application where the data encoded in the bar codes is used
Bar Coding 3
as an index to a record in the database that contains more detailed information about the item that is being scanned. Bar codes also provide quick and error free means for inputting the data into an application running on a computer.
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