How to create QRcode. CAUTION: This document contains strange or wrong English because I'm poor at English.
You should confirm standards as needed. 0. Introduction 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. QRcode is developed by DENSO Corporation. 1. How to create QRcode page2 - encode to data code words. How to create QRcode page2 previous page next page CAUTION: This document contains strange or wrong English because I'm poor at English.
You should confirm standards as needed. top page > QRcode > How to create QRcode > page2: How to encode - Capacity. Encoding to data code words. This document is describe how to encode with an easy example, and no complex function(like structured append) is. 2.1 Capacity Capacity of a QRcode is determined by version,error correcting level and encoding mode(e.g. numeric,alphanumeric etc) 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 page3 - Calculate error correcting code wor. How to create QRcode page4 - Data allocation. How to create QRcode page5 - How to apply mask pattern for QRcod. How to create QRcode page5 top page previous page next page CAUTION: This document contains strange or wrong English because I'm poor at English.
You should confirm standards as needed. How to create QRcode page6 - Format information. How to create QRcode page6 top page previous page next page CAUTION: This document contains strange or wrong English because I'm poor at English.
You should confirm standards as needed. How to create QRcode page7 - completion. 表５、QRコードでのRSブロック. 表２、QRコード 英数字モードの各文字に対応する値. 表３、QRコードでのエラー訂正コードの生成多項式. 表４、GF(2^8)αの指数表現と整数表現の対応表. 表１、QRコード バージョン１～９のコード数とデータ容量. Table6 calculation of error correct codewords for sample. Code de Reed-Solomon. 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.
Le résultat est alors envoyé, au lieu des symboles originaux. La redondance de ce suréchantillonnage permet au récepteur du message encodé de reconstruire le polynôme même s'il y a eu des erreurs pendant la transmission. Vue d'ensemble[modifier | modifier le code] Image de La Joconde, transmis au Lunar Reconnaissance Orbiter. Les codes Reed-Solomon sont des codes par bloc. Éléments. Les erreurs induisant une modification des données, ou certains bits passent de la valeur 0 à la valeur 1 et vice versa comme sur le canal binaire symétrique,les erreurs provoquant des pertes d'informations aussi appelées effacements, lorsque des paquets d'informations sont perdus ou effacés comme sur le canal binaire à effacement.
On note un codage de Reed-Solomon ou Avec : et. BCH code. 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 French mathematician Alexis Hocquenghem, and independently in 1960 by Raj Bose and D. K. Ray-Chaudhuri.[1] The acronym BCH comprises the initials of these inventors' names. One of the key features of BCH codes is that during code design, there is a precise control over the number of symbol errors correctable by the code. In particular, it is possible to design binary BCH codes that can correct multiple bit errors. BCH codes are used in applications such as satellite communications,[2] compact disc players, DVDs, disk drives, solid-state drives[3] and two-dimensional bar codes. Definition and illustration[edit] Primitive narrow-sense BCH codes[edit] Example[edit] Let q=2 and m=4 (therefore n=15). Its minimal polynomial over GF(2) is The minimal polynomials of the first seven powers of α are. A tutorial about QR code keywords. Includes examples. FAQ.
Number of total data bits when different kind of character was m. QR Code Standardization. Here is qr code spec in english - Open Source QR Code Library - Search. QR Code. QR code for the URL of the English Wikipedia Mobile main page, " QR code (abbreviated from Quick Response Code) is the trademark for a type of matrix barcode (or two-dimensional barcode) first designed for the automotive industry in Japan.
A barcode is a machine-readable optical label that contains information about the item to which it is attached. A QR code uses four standardized encoding modes (numeric, alphanumeric, byte / binary, and kanji) to efficiently store data; extensions may also be used.[1] The QR Code system became popular outside the automotive industry due to its fast readability and greater storage capacity compared to standard UPC barcodes. Applications include product tracking, item identification, time tracking, document management, and general marketing.[2] History[edit] The QR code system was invented in 1994 by Denso Wave.
Standards[edit] There are several standards that cover the encoding of data as QR codes:[5]