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PDF417 is also used by the airline industry's Bar Coded Boarding Pass (BCBP) standard as the 2D bar code symbolism for paper boarding passes. PDF417 is the standard selected by the Department of Homeland Security as the machine readable zone technology for RealID compliant driver licenses and state issued identification cards.
A Patch Code consists of two wide bars (0.2 inches (5.1 mm) ± 0.01 inches (0.25 mm)) and two narrow bars (0.08 inches (2.0 mm)). The bars are separated by three narrow spaces, so the Patch Code symbols are a fixed length. There are six distinct permutations of the wide and narrow bars, so there are six Patch Codes. [2] The patches are called:
Before 2006, the standard can be obtained only from AIM store [7] as ITS MicroPDF417 standard. [8] At that time, it is used as part of ITS - EAN.UCC Composite Symbology. [ 9 ] In 2006, MicroPDF417 standard was brought out as ISO/IEC 24728:2006 [ 3 ] and can be used independently or as part of GS1 Composite barcode symbology.
In 1973, the Universal Product Code (UPC) was selected by this group as the first single standard for unique product identification. In 1974, the Uniform Code Council (UCC) was founded to administer the standard. [1] On 26 June 1974, a pack of Wrigley's chewing gum became the first ever product with a barcode to be scanned in a shop. [1] [3]
A UPC barcode. The Universal Product Code (UPC or UPC code) is a barcode symbology that is used worldwide for tracking trade items in stores.. The chosen symbology has bars (or spaces) of exactly 1, 2, 3, or 4 units wide each; each decimal digit to be encoded consists of two bars and two spaces chosen to have a total width of 7 units, in both an "even" and an "odd" parity form, which enables ...
where "n" is a narrow line (bar or space) and "W" a wide line (2.0 to 3.0 times the width of a narrow line). Decoding Interleaved 2 of 5. Every pair of digits is color-coded, showing the code and the value for each digit. Because digits are encoded by pairs, only an even number of digits can be encoded.
The longer the barcode is, the greater distance of laser barcode reader from barcode image is needed, making reading difficult or impossible above some threshold lengths/distances. The optimal encoding can be found using a dynamic programming algorithm. [9]
The Microsoft Tag reader application is a free download for an Internet-capable mobile device with a camera. The Microsoft Tag reader is compatible with Internet-capable mobile devices, including many based on the Windows Phone 7 , Windows Mobile , BlackBerry , Java , Android , Symbian S60 , iPhone and Java ME platforms.