The Design And Implementation Of QR Code Recognition System Based On Windows Phone

In the recently a half century, the science and technology in the world have beendeveloped rapidly. As one of the technologies, bar code has been used in everyaspects of our lives. Barcode is a kind of two-dimensional code, QR code is acommon encoding which based on computer science and coding. The technology hasbeen widely applied in developed countries, while China is still on the startline.Information covered by a two-dimensional code is very rich, especially QR code, ahigher degree of technical complexity compared to one-dimensional code, how toachieve rapid and effective identification of two-dimensional code has become a hotresearch topic right now. As a mobile client, you can easily scan the two-dimensionalcode on your cell phone, so there are great potential and research value on theresearch of two-dimensional code on cell phone.This paper completed the following content:Firstly, the paper had introduced the most improtant features and coding theoryabout QR, and realized the decoding system from version1to version40.Secondly, I did the study of the advantages and limitations of the phone when weare doing image processing. The advantage is the phone small, we can carry iteverywhere, and we can easily scan two-dimensional code by it. But we will meetsome limitation about the phone’s hardware configuration, some efficient classicalalgorithms implemented on the PC, such as the Hough transform, is difficult toachieve on the phone. Therefore, how to develop an instant, and efficient algorithmswhich is suitable for windows phone platform becomes a focus of this study. Centeredalong these lines, this novel made a detailed description of the steps about the methodbased on two-dimensional code image processing on mobile platforms, including gray,binary and so on.Through two technical innovations which improved image processing speed: onthe one hand, when we rotate the binary image to a horizontal position, we justchoose the center of three detect-images, and put them into the two-dimensionalCartesian coordinate system, using the anti-trigonometric function calculated theangle that we must rotated. By this way, we had greatly reduced the time of the processing. On the other hand, I used an improved Wellner algorithm, which reducedthe complexity when we choosing the threshold to binary, and effectively elimiantethe effect of uneven illumination.Third, this paper focuses on the analysis of the characteristics of Windows Phonemobile phone operating system, made the realization of the QR code image detectionand recognition and RS correction algorithm by using C#language, the design andimplementation of a QR windows code recognition system based on Windows Phonemobile phone operating system. After that, I had mad detailed tests on both thesimulator and the real phone, the results of the experiments shows that the system hasgood performance and practical value, can meet the requirements of time andaccuracy on Windows Phone.