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 Aztec
Code is a high density 2 dimensional matrix style bar
code symbology that can encode up to 3750 characters
from the entire 256 byte ASCII character set. The symbol
is built on a square grid with a bullseye pattern at
its center. Data is encoded in a series of "layers"
that circle around the bullseye pattern. Each additional
layer completely surrounds the previous layer thus causing
the symbol to grow in size as more data is encoded yet
the symbol remains square. Aztec's primary features
include: a wide range of sizes allowing both small and
large messages to be encoded, orientation independent
scanning and a user selectable error correction mechanism.
The smallest element in an Aztec symbol is called a
"module" (i.e. a square dot). The module size
and the amount of error correction are the only "dimensions"
that can be specified for an Aztec symbol and both are
user selectable. It is recommended that the module size
should range between 15 to 30 mils in order to be readable
by most of the scanners that are currently available.
The overall size of an Aztec symbol is dependent on
the module size, the total amount of encoded data and
also on the level of error correction capacity chosen
by the user. The smallest Aztec symbol is 15 modules
square and can encode up to 14 digits with 40% error
correction. The largest symbol is 151 modules square
and can encode 3000 characters or 3750 numeric digits
with 25% error correction.
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