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Home QR-Code Resources + Understanding a QR-Code

Understanding a QR-Code

qrcode_overview4

Patent holder

Patent  - 6,494,375

Denso Wave - The QR code specification has been disclosed and the patent right is not exercised.

Model

Model 1 - Orginal - ISO/IEC 18004:2000 (withdrawn)
Model 2 - Enhanced - ISO/IEC 18004:2006
Micro

Code Type

Matrix

Error Correction

Reed Solomon (Decoder sourceL:7%, M:15%,Q: 25%,H:30%. View estimate of additional data required using this error correction method.

Maximum Data Characters

Text (4,296), Digits (7,089), Bytes (2,953), Kanji characters (1,817). View max characters for each version.

Standardisation

JIS X 0510, ISO/IEC 18004:2006

Application layer implementations

Google Zxing

Ntt Docomo

openmobilealliance.org

Dimensions

Symbol Height: 21-177 modules

Symbol Width: 21-177 modules

4 modules for are added each subsequent higher version

 

Version Modules
1 21
2 25
3 29
4 33
5 37
6 41
7 45
8 49
9 53
10 57
11 61
12 65
13 69
14 73
15 77
16 81
17 85
18 89
19 93
20 97
21 101
22 105
23 109
24 113
25 117
26 121
27 125
28 129
29 133
30 137
31 141
32 145
33 149
34 153
35 157
36 161
37 165
38 169
39 173
40 177
 

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