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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 ...
ISSN with an EAN-2 addon representing issue number 5. The EAN-2 is a supplement to the EAN -13 and UPC-A barcodes. It is often used on magazines and periodicals to indicate an issue number.
Two out of every five bars or spaces are wide, giving the name "2 of 5", and each pair has a consistent width. The wide lines form a two-out-of-five code with consecutive values of 1, 2, 4, 7, and 0, where the code 0 is assigned to the value of 11. This is similar to the POSTNET bar code. Digits 01 23 45 67 89 encoded in ITF: a = quiet zones
Industrial 2 of 5 is a subset of two-out-of-five codes. [5] Industrial 2 of 5 is one of the first 1D and oldest barcodes and can encode only digits (0-9). It was invented in 1971 [6] by Identicon Corp. and Computer Identics Corp. At this time, it has only historical value because of low encoding density and restricted charset.
For instance, encoding the ASCII character "0" can be viewed as 10011101100, where a sequence of 1's is a bar and a sequence of 0's is a space. A single 1 would be the thinnest line in the bar code. Three 1's in sequence (111) indicates a bar three times as thick as a single 1 bar.
Plessey Code is a 1D linear barcode symbology based on pulse-width modulation, developed in 1971 by The Plessey Company plc, a British-based company. [1] It is one of the first barcode symbology , and is still used rarely in some libraries and for shelf tags in retail stores, in part as a solution to their internal requirement for stock control.
The structure of the barcode is based on the checksum. In order to compute the checksum, multiply each of the digits by either 3 or 9, alternating each time. Then add them and then do a mod 10. So the checksum for 05415 MN is 1 based on the following calculations: 0*3=0 5*9=45 4*3=12 1*9=9 5*3=15 ----- 81 % 10 = 1
The PDF417 bar code (also called a symbol) consists of 3 to 90 rows, each of which is like a small linear bar code. Each row has: a quiet zone. This is a mandated minimum amount of white space before the bar code begins. a start pattern which identifies the format as PDF417.