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Thus, each symbol begins with a bar and ends with a space. In barcode fonts, the final bar is generally combined with the stop symbol to make a wider stop pattern. The following table details the widths associated with each bar and space for each symbol. The width of each bar or space may be 1, 2, 3 or 4 units (modules).
Library Book Barcode. Codabar is a linear barcode symbology developed in 1972 by Pitney Bowes Corp. [1] It and its variants are also known as Codeabar, Ames Code, NW-7, Monarch, Code 2 of 7, Rationalized Codabar, ANSI/AIM BC3-1995 or USD-4.
Plessey Code barcode composition. The barcode encodes hexadecimal digits (i.e., the hex digits 0-F) as 4 bars (bits). The LSB is on the first bar on the left, and the MSB is the last bar on the right. A "0" bit is represented as a narrow bar, followed by a wide space. The "1" is represented by a wide bar, followed by a narrow space.
The total width is 17 times the width of the narrowest allowed vertical bar (the X dimension); this is where the 17 in the name comes from. Each pattern starts with a bar and ends with a space. The row height must be at least 3 times the minimum width: Y ≥ 3 X. [2]: 5.8.2
The precise width of the wide bars and spaces is not critical; typically, it is permitted to be anywhere between 2 and 3 times the width of the narrow equivalents. Some other symbologies use bars of two different heights , or the presence or absence of bars (CPC Binary Barcode). These are normally also considered binary bar codes.
But rMQR Code is more suitable for the rectangular areas and has difference between width and height up to 19 in R7x139 version. In this way it can be used in places where 1D barcodes are used. rMQR Code can replace Code 128 and Code 39 barcodes with more effective data encoding.
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