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Slant and incorrect segmentation of characters may result in descending discrimination of characters in automatic license plate recognition. To solve this problem, cellular neural networks and discrete-time cellular neural networks are used. First a massive region where characters are included in image is got by use of a shadow detector, then upper edge and subjacent edge of this massive region are obtained. As a result, a slant angle of license plate is achieved gotten and slant correction is made.... Slant and incorrect segmentation of characters may result in descending discrimination of characters in automatic license plate recognition. To solve this problem, cellular neural networks and discrete-time cellular neural networks are used. First a massive region where characters are included in image is got by use of a shadow detector, then upper edge and subjacent edge of this massive region are obtained. As a result, a slant angle of license plate is achieved gotten and slant correction is made. When slant image is corrected, the frame and other interferences are removed. Finally isolation of characters is done using another discrete-time cellular neural networks template. The results show that cellular neural networks and discrete-time cellular neural networks are efficient in slant correction and isolation of characters. 车牌自动识别中 ,牌照倾斜和单字切分不准确会使字符识别率下降。为此提出基于细胞神经网络的牌照倾斜校正及单字切分的方法。由阴影检测器得到包含字符的块状区域 ,并得到块状区域的上、下边缘线 ,从而得到牌照的倾斜角度 ,对牌照进行倾斜校正。对校正后的图像 ,用相连单元检测器去除边框及其它干扰 ,并用另一个离散时间细胞神经网络模板完成单字切分。结果表明 ,利用细胞神经网络可以较好地完成牌照倾斜校正和单字切分 ,为后面的字符识别作了较好的准备。 China had a monopoly over its oil imports and exports before 1994, With reform of the foreign trading system and the oil industrial system, three enterprises were authorized to conduct imports and exports in 1994, Currently, China practices the automatic license management system for imports of crude oil, divided between state-owned trade and non-state-owned trade. There are four state-owned trade enterprises that are subject to adjustment of the total import volume by the Stale Economic and Trade Commission... China had a monopoly over its oil imports and exports before 1994, With reform of the foreign trading system and the oil industrial system, three enterprises were authorized to conduct imports and exports in 1994, Currently, China practices the automatic license management system for imports of crude oil, divided between state-owned trade and non-state-owned trade. There are four state-owned trade enterprises that are subject to adjustment of the total import volume by the Stale Economic and Trade Commission under the unified with a tariff rate of zero. The quota and license management system pertains to the import of oil products, also covering both state-owned trade and non-state-owned trade. There four state-owned trade enterprises engaged in import of oil products (excluding fuel oil). A total of 65 state-owned enterprises are engaged in import of fuel oil. Together with Ministry of Foreign Trade and Economic Cooperation, the State Economic and Trade Commission sets import quotas according to the total volume promised at the time of China's entry into World Trade Organization. The Quota License Affairs Bureau and its local offices, authorized by the Ministry of Foreign Trade and Economic Cooperation, is responsible for issuance of import licenses. The government will gradually lift administration control over oil imports and exports. Foreign oil trade will be ultimately be based on international and domestic markets. With China's WTO membership, China's oil foreign trade and oil market will increasingly be deregulated so that the qualified foreign enterprises can enter China's oil retail and wholesale market. 1994年以前我国对石油的进出口贸易实行独家专营。1994年,随着我国外贸体制和石油产业体制改革的深入,石油进出口经营企业扩大为三家。目前我国原油进口为自动进口许可管理,分国营贸易和非国营贸易两部分,国营贸易企业共有四家,由国家经贸委进行总量调控,统一安排进口量,关税为零。成品油进口实行配额和许可证管理,并实行国营贸易和非国营贸易。成品油(除燃料油外)国营贸易企业有4家,燃料油国营贸易企业为65家。进口配额由国家经贸委会同外经贸部在“入世”承诺的成品油进口总量内下达,外经贸部授权的配额许可证事务局和驻各地办事处负责签发进口许可证。今后政府对石油进出口的管理将逐步弱化行政手段,最终走向主要由国际、国内两个市场来决定。随着中国“入世”承诺的兑现,中国的石油贸易和石油市场将越来越开放,符合条件的外国企业将全面进入中国石油市场的零售、批发领域,中国的石油市场将更趋向国际化。 The paper analyzes the demands,structure, functions and the realized method of the data base of the Automatic License Plate Recognition System(ALPRS),and designs the data base accommodated the ALPRS.It is good by experiment. 对车辆牌照自动识别监控系统(ALPRS)数据库的需求、结构、功能及实现方法进行了分析,设计了与其适应的功能完备的数据库系统,实验效果良好。
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