IntroductionAztec Code was invented by Andy Longacre of Welch Allyn Inc. in 1995 and is in the public domain. Aztec Code was designed for ease-of-printing and ease-of-decoding.
It has a finder pattern of concentric square rings centered on a single dark module located in the center of the symbol. A two-dimensional imaging device such as a CCD camera is necessary to scan the symbology. Aztec Code is designed with user-selectable percentages of error correction. It supports industry standard escape sequences to define international code pages and special encodation schemes. Aztec Code is used for small item marking applications using a wide variety of printing and marking technologies. This document includes descriptions of the character encodation, symbol structure, reference decode algorithm, and symbol quality measurements for Aztec Code.
The symbols are square overall on a square grid with a square central bullseye finder. The smallest Aztec Code symbol is 15x15 modules square, and the largest is 151x151. The smallest Aztec Code symbol encodes 13 numeric or 12 alphabetic characters, while the largest Aztec Code symbol encodes 3832 numeric or 3067 alphabetic characters or 1914 bytes of data. No quiet zone is required outside the bounds of the symbol . There are 32 sizes in all with user-selected amounts of Reed-Solomon error encoding from 5% to 95% of data region.
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