| The tobacco, as a special industry, has contributed to the economic development in the world greatly, and become the important source of the finance income of all the countries. However, since the people's life level increases continuously, people pay more attention to health condition of their own. The idea that smoking is harmful to health has gone deeply into the heart gradually. Then, how to reduce the harmfulness of tobacco to people, how to increase the quality of the cigarette, all above has become the first way to develop tobacco industry. Because tobacco industry can make a great fortunate, it has already become the focus that pursued by international tobacco company. In order to win the competition, we should enhance the competitive capability of the products, improve the quantity of the tobacco product and reduce disservice to people. Concretely speaking, eliminating the foreign body in the tobacco production line is the most important means.Traditionally, eliminating the foreign body is completed manually. Certainly the efficiency and dependence of this way is rather lower. Now a few large tobacco enterprises want to use high automation equipment to complete this work automatically so as to enhance competition capability of enterprise. However, this kind of automation equipment has not manufactured in home with successful experience, the only way is to import. But the advanced equipment with high technique is very expensive and its technique support is not available, most important is that it is impossible to introduce product in same period because of the intelligent property right. Therefore, it has the very profound meaning to tap and manufacture this kind of high automation equipment with the intelligent property right.Foreign body in tobacco online detecting and real-time eliminating system, supported under the country plan fund, is taped and manufactured by Chongqing university and Kunming ship group LTD. The work principle of system is following: Using high speed color line CCD to obtain the image of tobacco flow, through special software's processing, to recognize and locate the foreign body in tobacco, finally send out the foreign body position information to nozzles, which eliminate the foreign body in the end. The key point of the system is two sides, one is real-time processing, and the other is that exactly recognizing various foreign bodies in tobacco. Real-time processing is not an easy case based on Microsoft windows 2000, the writer combinedthe basic of the relevant SDK, completed not only the kernel programming, but also physical memory directly access. Aimed at the different tobacco with the random chroma value, self-adapting threshold algorithm is designed. Combined with various color space mode to process at the same time, completed precise recognition and location more than 18 kinds of foreign bodies.The prototype has unified the optical, mechanical, electronical, aerodynamics and computer control under the lack of wind press system, and be able to send material automatically, make the material spread, transport the material in a high speed (5m/s), grab image dynamically, transmit data with super-speed, recognize the foreign body, eliminate the foreign body. The successful process is validated the feasibility of whole system. In such condition, to single 30mm × 30mm foreign body, the recognition rate is 78.7℅ and the eliminating rate is 62.4℅. It is illustrated the feasibility of the design principle.To large foreign body such as 30mm×30 mm, the performance of system is rather good, but to small foreign body, the performance is not satisfaction. We analyze the experimental data and find out the way of improvement. In addition to improve wind press system, still do effort in other aspects. First, high performance line CCD, adopted prisms divide light into R, G, B three beams without three color-offset problem. Secondly, adopted the sophisticated grab card to solve minimal unit (the current card can realize the least 16 lines). Finally, synthesize more succin...
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