How to create QRcode
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How to create QRcode
For some reason I thought to convert code39 barcode to QRcode in a web system. However, specifications of barcode were on Internet, we could get no specification of QRcode in 2000. (Now we can see a Japanese specification for QRcode in JISC.) So I think it is useful "how to encode QRcode" for following implementers ,and I wrote this document. The below figure is a structure of QRcode model2 version 1.
For example, In version 1 and error correcting level Q, 27 numeric characters can be stored or 16 alphanumeric characters can be stored. 11 byte data can also be stored.
How to create QRcode page2 - encode to data code words
How to create QRcode page4 - Data allocation
In QRcode,1 module means 1 bit. Result data in previous section are encoded to binary representation, and we allocate these encoded data.If one color modules are much than other color or pattern like "finder pattern" exists, decoder application can have many mistake. To prevent above case,best mask pattern which is selected from among 8 pattern is covered in QRcode. We estimate result of above mask pattern to select.
How to create QRcode page5 - How to apply mask pattern for QRcod
Un article de Wikipédia, l'encyclopédie libre. Le code de Reed-Solomon est un code correcteur basé sur les corps de Galois dont le principe est de construire un polynôme formel à partir des symboles à transmettre et de le suréchantillonner .
Code de Reed-Solomon - Wikipédia
BCH code - Wikipedia, the free encyclopedia
In coding theory the BCH codes form a class of cyclic error-correcting codes that are constructed using finite fields . BCH codes were invented in 1959 by Hocquenghem , and independently in 1960 by Bose and Ray-Chaudhuri . [ 1 ] The abbreviation BCH comprises the initials of these inventors' names.
A tutorial about QR code keywords. Includes examples.
QR code (Quick Response) is a matrix code created by Japanese corporation Denso-Wave . It is a two-dimensional bar code which can store up to 7kB of data, such as: plain text, mobile telephone numbers along with a SMS message, contact cards (e.g VCards), geographic information, images and other information.
To use the word “ QR Code” in your publications or web site, etc, please indicate a sentence QR Code is registered trademark of DENSO WAVE INCORPORATED.
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