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Symbologies:
Symbology is the equivalent to a language, the mapping between messages
and barcodes. Several systems require that you conform to a specific
company-specified symbology. With a few systems, you have the choice of
using any symbology you want.
Linear symbologies can be classified properties:
Continuous or discrete:
Continuous is when the characters are adjoin, with one character ending
with a space, the following character starting with a bar, or
conversely.
Discrete symbologies begin and end with bars ignoring the intercharacter
space providing it doesn't appear to be the code ends.
Two-width or many-width:
Two-width symbologies can be wide or narrow. Their width has no
significance providing the symbology specifications for wide bars are
adhered.
Many-width symbologies are multiples of the basic modules, usually using
four widths of 1, 2, 3, and 4 modules.
Stacked symbologies are a given linear symbology that is repeated
vertically in multiple rows.
2-D symbologies feature square or dot-shaped modules position on a grid
pattern. The most common 2-D symbologies are matrix codes. There
are numerous 2-D symbologies that use steganography to hide various
sized or shaped modules within a user-specified image.
Scanner/symbology interaction:
Linear symbologies are read by a laser scanner. The scanner sweeps a
light beam across the barcode, reading the barcode's light-dark
patterns.
Stacked symbologies are also read by laser scanning. With stacked
symbologies, the laser makes multiple passes across the barcode.
2-D symbologies cannot be read by a laser they must be read or scanned
by a camera capture device.
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Terms for use
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