AZTEC BARCODE

High density 2D matrix bar code, created in Welch Allyn Inc., Andy Longacre in year 1995, public domain. Aztec code is a 2D matrix barcode symbology designed to combine the best characteristics of several 1st generation symbologies, with special attention paid to ease of printing, ease of finding in any orientation, allowance for field distortion, high data security with user-selected redundancy, and efficient storage over the range from small to large data messages. Aztec symbols are always a square array of square cells with a square "bullseye" at the center. Figure 1 shows an Aztec code symbol encoding 109 characters of text with 50% error correction.
Reed-Solomon error control encoding provides a user-selected level of data security and robustness.reed_solomon" title="Reed-Solomon error correction agorithm">Reed-Solomon error control encoding provides a user-selected level of data security and robustness.

Easy printing
Easy decoding - bulls eye in center
minimum size is 13 chars - equal to EAN13 to size
No need quiet zone
32 code sizes
Reed Solomon error coding

can encode 3750 character from all 256 ASCII chars
center of barcode is "bulls eye"
smallest element is named "element, square dot
error correction symbols size are selectable

The overall size of an Aztec symbol is depended on module size, the total amount of encoded data and error capacity is choosen by the user.
The smallest Aztec symbol is 15 module square and ancode 14 digits with 40 % error correction.
The largest symbol is 151 modules square and can encode 3000 chracters or 3750 digits with 25% error correction.

Encodable character set:
- All 8-bit values
Representations of data : dark module is binary one and light module is binary zero....
Symbol size: smallest 15x15 modules, largest 151x151 modules
Data capacity:
- Smallest Aztec code encodes 13 numeric or 12 alphanumeric or bytes of data
- Largest encodes 3832 numerics, 3067 alphabetic or 1914 bytes.
Error correction:
- User-selectable, from 5 % to 95% of data
- Recomended level is 23% of symbol capacity plus codewords
Codetype : Matrix
Orientation independent : Yes

The size and data bits capacity of Aztec code symbols
Layers	Size	Capacity	Layers	Size	Capacity	Layers	Size	Capacity
1	19x19	21x6	12	67x67	364x10	23	113x113	920x12
2	23x23	48x6	13	71x71	416x10	24	117x117	992x12
3	27x27	60x8	14	75x75	470x10	25	121x121	1066x12
4	31x31	88x8	15	79x79	528x10	26	125x125	1144x12
5	37x37	120x8	16	83x83	588x10	27	131x131	1224x12
6	41x41	156x8	17	87x87	652x10	28	135x135	1306x12
7	45x45	196x8	18	91x91	720x10	29	139x139	1392x12
8	49x49	240x8	19	95x95	790x10	30	143x143	1480x12
9	53x53	230x10	20	101x101	864x10	31	147x147	1570x12
10	57x57	272x10	21	105x105	940x10	32	15x151	1664x12
11	61x61	316x10	22	109x109	1020x10

Data codeword sizes and prime modulus polynomials.
Layers	Codeword	Galois field	Prime Modulus Polynomial	decimal equib.
1-2	6 bits	64	X⁶+X+1	67
3-8	8 bits	256	X⁸+X⁵+X³+X²+1	301
9-22	10 bits	1024	X¹⁰+X³+1	1033
23-32	12 bits	4096	X¹²+X⁶+X⁵+X³+1	4021

Aztec code high-level encoding
	Upper		Lower		Mixed		Punct		Digit
Value	Char	ascii	Char	ascii	Char	ascii	Char	ascii	Char	ascii
0	PS		PS		PS		FLG	***	PS
1	SP	32	SP	32	SP	32	CR	13	SP	32
2	A	65	a	97	SOH	1	CR LF	13,10	0	48
3	B	66	b	98	STX	2	. SP	46,32	1	49
4	C	67	c	99	ETX	3	, SP	44,32	2	50
5	D	68	d	100	EOT	4	: SP	58,32	3	51
6	E	69	e	101	ENQ	5	!	33	4	52
7	F	70	f	102	ACK	6	"	34	5	53
8	G	71	g	103	BEL	7	#	35	6	54
9	H	72	h	104	BS	8	$	36	7	55
10	I	73	i	105	HT	9	%	37	8	56
11	J	74	j	106	LF	10	&	38	9	57
12	K	75	k	107	VT	11	'	39	,	44
13	L	76	l	108	FF	12	(	40	.	46
14	M	77	m	109	CR	13	)	41	UL
15	N	78	n	110	ESC	27	*	42	US
16	O	79	o	111	FS	28	+	43
17	P	80	p	112	GS	29	,	44
18	Q	81	q	113	RS	30	-	45
19	R	82	r	114	US	31	.	46
20	S	83	s	115	@	64	/	47
21	T	84	t	116	\	92	:	58
22	U	85	u	117	^	94	;	99
23	V	86	v	118		95	<	60
24	W	87	w	119	`	96	=	61
25	X	88	x	120	\|	124	>	62
26	Y	89	y	121	~	126	?	63
27	Z	90	z	122	DEL	127	[	91
28	LL		US		LL		]	93
29	ML		ML		UL		{	123
30	DL		DL		PL		}	125
31	BS		BS		BS		UL

The Size and Bit Capacity of Small Aztec Symbols
Layers	Size	Capacity	Layers	Size	Capacity
1	15x15	17x6	3	23x23	51x6
2	19x19	40x6	4	27x27	76x8

SMALL AZTEC CODE

Small Aztec code is smaller version of Aztec code for coding smaller messages to 95 chars.Decoding rights is some as in Aztec Code

Only 4 sizes of barcode
Easy printing
Easy decoding
Maximum 95 chars or 120 digits