| Compared with ID-Barcode,2D-Barcode endows with unique advantages. As an information carrier, it has found wide application in daily life for its greater capacity, stronger error-correcting capability, higher reliability and superior confidentiality. QR Code belongs to matrix 2D-Barcode. Apart from the above mentioned advantages, it has individual distinguished features, such as ultraspeed multi-dimensional identification, extensive character encoding. Therefore it can effectively manifest Chinese characters. Based on these, QR Code is suitable for promotion in domestic. This thesis mainly deals with theory and realization about QR Code encoding and decoding system.In this thesis, a brief description of the status of QR Code is given. And combined with GB standards, the essential features, symbol structure, encoding and discoding processes of QR code are detailed analyzed. And based on the open source of Reed-Solomon code algorithm, this thesis uses C/C++language to implement and improve the encoding and decoding system. Accordingly, since Reed-Solomon code, as a kind of multi level linear space-time block code, has strong error-correcting capability in encoding/decoding, a thorough research and discussion related with its operation rules, operational circuit has been given so as to analyse its further implement and application in the QR code. During the encode system design, this thesis introduces interweave algorithm and expounds it particularly. Meanwhile, in the process of decoding, design, image preprocessing is briefly analyzed, and a detailed study about data decoding process is: also made. In addtion, this thesis adopts the precorrection method in remainder codewords. And. combined with interweave algorithm, the image of QR Code expandes its anti-pollution area. On the basis of detailed examples and description, this thesis puts forward the opinions. |
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