Aztec Barcode

The AZTEC barcode type is the ISO / IEC 24778: 2008 2D barcode standard invented by Andrew Longacre, Jr. and Robert Hussey in 1995 filed in the public domain.

An Aztec code consists of a central eye of 5 concentric squares on 9x9 pixels, and 4 marks at the corners to distinguish the orientation increasing the minimum size to 11x11 pixels minimum. The first 40 bits available are used to encode the message parameters.

The message data is then distributed in binary around the edge, always concentrically. In the message, check / error correction bits must be added according to the Reed-Solomon code.

The Aztec barcode uses 4-bit and 5-bit coding, with a switch system from one mode to another.

The 1 bits are encoded by black squares, and the 0 bits are encoded by white squares.

Refer to the documentation for more details. dCode allows the encoding of any ASCII message.

The reading consists of detecting the central eye of the 2D code, identifying the orientation and spiral reading the bits 0 and 1 (black = 1 and white = 0).

dCode does not offer playback, but recommends mobile phone apps.

The Aztec code has the ability to be adaptive in size while keeping it minimal. Graphical coding makes the data concentric.

The Aztec name (from the Aztec Indian people) comes from the graphical resemblance of the bar code center with the Aztec pyramids (seen from above).

An Aztec barcode is a 2D square composed of black and white dots (or 2 distinguishable enough colors). Its main feature is the center of the barcode with 5 concentric squares, 3 black and 2 white alternately. These squares may be reminiscent of an Aztec pyramid (staircase) in plan view.