| Barcode technology is an automatic identification technology that is consist of coding, printing, data acquisition and processing. Barcode can be divided into one-dimensional(1D) barcode and two-dimensional(2D) barcode,1D barcode has a lot of advantages, such as low cost and easy communication, while 2D barcode has large information capacity, high reliability, ability to express various forms of data, strong security, etc. Firstly, by analyzing multiple 2D barcode standards, summarize the general procedure of encoding technology, and detailed analyze the data coding technology, error correcting code generation method and mask technology. Secondly, analyze the 2D barcode decoding algorithm that is based on image processing, compare the different algorithms in the process of image pre-processing, positioning & adjustment and data correction. Then detailed design the decoding algorithm for QR code, improve the binarization algorithm for 2D barcode image and QR code positioning algorithm, and analyze the efficiency and fault tolerance of the improved QR code decoding algorithm. By analyzing the execution time of the decoding algorithm, find and optimize the key algorithms. The experimental results show that the improved QR code decoding algorithm is efficient and stable, and can identify the QR code image uneven illumination, with noise or deformation. Thirdly, design an embedded QR code recognition system in view of the specific application of 2D barcode. To simplify the process of image acquisition and the recognition system, design the image acquisition sub-system based on S3C2440 and OV7620 in detail. Finally, realize the embedded QR code recognition system on TQ2440, complete the function of real-time image acquisition, loop receiving user request for decoding, decoding with the result returned and some others. |
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