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Applications of barcodes:
Barcodes and RFID (Radio frequency Identification) are used when items
have to be labeled with information, which are to be processed by
computers. No longer does the data have to be manually typed into a
terminal, the operator simply has to display the code to a barcode
reader and the information is entered automatically. In fully automated
environments, such as baggage routing at airports barcodes contain the
destination and passenger information.
With each application, the data contained in the barcode varies. A
simple example of this would be an identification number, which is used
to index a database where the complete information is kept. The EAN-13
and UPC codes work in this manner.
The more completed barcode contains the complete information; therefore,
there is no need for an external database. This led to the development
of barcode symbologies, which are equivalent to a language. The limited
space of simple barcodes and the push to encode more information led to
the development of matrix codes or true 2D barcodes. These consist of a
grid of square cells rather than bars. A compromise between true 2D
barcodes and linear barcodes are the stacked barcodes. These are created
by taking a traditional linear symbology, and then placing it in an
envelope, which permits multiple rows.
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