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bar code - technical definition
The printed code used for recognition by a bar code scanner (reader). Traditional one-dimensional bar codes use the bar's width to encode just a product or account number. Two-dimensional bar codes, such as PDF417, MaxiCode and DataMatrix, are scanned horizontally and vertically and hold considerably more data. PDF417 is widely used for general purposes. MaxiCode is used for high-speed sortation, and DataMatrix is used for marking small parts. See bar code scanner, UPC, point of sale, AIM and PDF417. Contrast with RFID.
One-Dimensional Bar Code
This 1-D bar code is widely used as the universal product code (UPC) on millions of consumer items.
PDF417
This 2D PDF417 bar code image developed by Symbol Technologies contains the entire Gettysburg address. It is identified by patterns of vertical lines on each side. (Image courtesy of Symbol Technologies, Inc.)
DataMatrix
The DataMatrix code is used to mark small parts. It is identified by two solid lines and two alternating dark and light lines on its perimeter. (Image courtesy of AIM, Warrendale, PA, www.aimglobal.org)
MaxiCode
The MaxiCode uses hexagonal symbols and is identified by a bulls eye in the center. It is used for high-speed sortation. (Image courtesy of AIM, Warrendale, PA, www.aimglobal.org)
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