Aztec code
The Aztec code is a matrix code. It can be recognized by the fact that it has a square search element in the center surrounded by several lines arranged in a square. The Aztec code uses the ASCII character set with 128 characters and also Extended ASCII with 256 characters. The Aztec code can be used to represent up to 3,750 characters.
The encoded characters surround square patterns the square search element placed in the center. The characters are arranged from the inside to the outside and determine the size of the Aztec code, because each added character surrounds the existing structure on the outside in a ring. The code is equally suitable for encoding small size characters and large size characters. The smallest character is the module, which corresponds to a square dot. The module size should be between 15 mm and 30 mm to be detected by most readers.
The Aztec code is extremely resistant to errors. It is characterized by the fact that the encoded values can still be reconstructed even if up to 40% of the code area is damaged and no longer readable.