Construct Of Two-Dimensional Bar Code Identification Tool

With development of communication and computer technology, bar code technology came into bing, it is one of automated identification technology. According to the binary encoding rule, some bars and spaces compose of the bar code figure. The scanner reads the figure and processor decodes informations. Since bar code technology came forth, people have paid important attention to it. The bar code technology has abroad applied in transportations, bussiness, medical treatment, manufacturing, storage, postage fields and so on. The bar code technology has improved the speed of data collection and information processing, increased the work efficiency, now one-dimensional bar codes are most widespread, but the information which one-dimensional bar codes stores is limited, this is also its most weakenss.It must depend on external database. Without the database, one-dimensional bar codes can not have meanings. Two-dimensional bar codes overcome this weakness, it can encode a large ament of information in a small area, is a full data file. It is an ideal method, which can store information on card and can be decoded by scanner.In order to popularize the domestic two-dimensional bar code, we must design flexible two-dimensional bar code identification tools. We utilize image sensor to structure the image collection circuit board. On the basis of the experiments, we consult the principle of the existing two-dimensional bar code identification tools and put forward a new design. Our purpose is to reduce the cost of tool and improve the efficiency.The article introduces the new design of two-dimensional bar codes scanner. The scaning of two-dimensional bar codes is accomplished using CMOS image sensor, high speed DSP is utilized to process image data, FPGA is utilized to control the states of system. The new design has made scaning quicker and easier. The article describes the principle, function and hardware structure of system. The important content of article is the discussion of the function of FPGA. At the same time, the article also sets forth the characteristics and development status of two-dimensional bar codes.