So you've read a little about QR codes and now want to know more about who created them and how the're created?. Rather than regurgitate content already available on the web I thought that I'd just list the points.
The finder pattern enables scanners to locate the QR code and its orientation in order for it to be scanned and decoded correctly. Most scanners can scan a QR code even if it's upside down as the software will correct the skew before processing. The three static finder patterns are placed in the top left, right and bottom left and are surrounds by white-space seperators
Timing patterns were introduced in version two of the specification and are used solely to adjust th skew. Smaller QR codes will have a single pattern whereas larger codes will have multiple patterns. No white space seperators are used.
As a redundancy Version informtion is stored in two areas on QR codes with version 7 or higher.
Patent - 6,494,375
Denso Wave - The QR code specification has been disclosed and the patent right is not exercised.
Model 1 - Orginal - ISO/IEC 18004:2000 (withdrawn)
Model 2 - Enhanced - ISO/IEC 18004:2006
Reed Solomon (Decoder source) L:7%, M:15%,Q: 25%,H:30%.
Maximum Data Characters
Text (4,296), Digits (7,089), Bytes (2,953), Kanji characters (1,817).
JIS X 0510, ISO/IEC 18004:2006
Application layer implementations
Symbol Height: 21-177 modules
Symbol Width: 21-177 modules
4 modules for are added each subsequent higher version