The Research And Design Of 2-D Barcodes Recognition System

Now the information industry revolution climax become more and more popular,people’s life is filled with all kinds of high-tech information technology，While the barcode technology is the most representative one that integrated into people’s lives, it inthe daily life of people everywhere, it bring people great convenience in the new agelife. Bar code technology is a universal business language integrated data coding, barcode printing, bar code recognition, data collection, It has a standardized datacollection methods, which can uniform coding and marking for Commodityinformation. The bar code technology in our country are in the important period ofresearch, development and promotion, With the influence of rapid economicdevelopment brought by China’s accession to the WTO, Chinese bar code technologyresearch has been imminent.But at present, two dimensional barcode technology is far from a d codetechnology in domestic，and its application only for part of transportation industry andbusiness field. So the research about two dimensional barcode’s identification systemis necessary.First, this paper introduces the principle of major two-dimensional codes DataMatrix encoding theory, then describes the two-dimensional bar code recognitionalgorithm based on image processing in detail, which has a good processing effect forhandheld devices to get two dimensional barcode image that is not clear and difficultorientation; Then highlights the algorithm of image preprocessing and bar codepositioning, and in contrast the pros and cons of all kinds of two dimensional barcodeimage positioning algorithm choose to the optimal positioning algorithm used inmobile devices of two dimensional barcode identification. And finally complete a setof two-dimensional barcode identification algorithm in Microsoft Visual Studio 2008integrated development environment.To improve the recognition rate for barcode, this paper make an innovation andimprovement on image’s preprocessing and positioning link. The main completed works are as follows:(1) For binary image threshold value has carried on many times the test, lookingfor the best methods to gain the most optimum threshold.(2) To bar code positioning error is big, the result of identify is bad, chooseSobel operator on edge detection and treatment results projection positioning.(3) Do a thorough research on the barcode rotation correction and bar code datasampling algorithms, and when in data sampling extraction, using the 3×3neighborhood voted to pixel values.(4) To implement the system, and make verification contrast for multiplealgorithm.