The Design And Implentation Of Two-Dimensional Barcode Recognition System On Mobile Phone

The 2D barcode which emerged with the development of information technology has a promising future. As a kind of 2D barcode, QR code is a special symbology based on digital image processing and combined coding theory. As the 2D barcode has relatively higher density information, its recongnition is more complex than that of 1D barcode. Therefore, it is important theoretical and practical meaning to study the problems of embedded barcode recognition system based on image processing, especally the recognition on mobile phone.This paper is about the projects cooperated with the enterprise and has completed the following aspects:First, we introduced the code features and coding theory about QR code. And we developed the coding system of QR code based on the fixed version (version 1 and version 4).Second, we discussed the image processing technology of QR code based on mobile phones. As the process capacity of mobile phone is limited, some excellent technology, such as Hough Transform, which is complicated and takes much time, is not practical. So we are trying to find the way of image recognition which takes little time and is easy to be operated. We introduced the methods and steps for the image processing technology which includes gray image, image binarization, image cropping, image binarization, image projection, image rotation and median filtering. Particularly, as we only choose four points to rotate, the time and memory consuming is dramatically decreased. The experiment result shows that the process steps can reduce noise influence efficiently and satisfy the command of time consuming. We proposed two methods of technology innovation to improve the speed of image processing: As we only choose four points to rotate, the time and memory consuming is dramatically decreased. Besides we reduced the complexity of choosing the Threshold for image binarization through making the image binarization twice.Last, we discussed the decoding theory and steps of QR code.We also did the research about the method to develop the software on mobile phone using J2ME.The test result shows that the 2D barcode recognition system on mobile phone can reduce noise influence efficiently and satisfy the command of time consuming.