%0 Journal Article
%T An Adaptive Algorithm for Automatic License Plate Orientation<br>一种自适应车牌图像定位新方法
%A LI Bo
%A ZENG Zhi-yuan
%A ZHOU Jian-zhong
%A LI Bo
%A ZENG Zhi-yuan
%A ZHOU Jian-zhong
%A LI Bo
%A ZENG Zhi-yuan
%A ZHOU Jian-zhong
%A <br>李波
%A 曾致远
%A 周建中
%J 中国图象图形学报
%D 2009
%I 
%X An adaptive algorithm for license plate(LP) orientation was proposed. Based on the common features of LP, the vertical edge was first detected. Then, some approaches were adopted to remove adaptively the invalid edge due to the characteristics of vertical texture and edge density, so that the regions with features of LP were preserved. Next, horizontal morphologic operation was conducted to close the candidate regions, and the above method overcomes the problem how the morphologic structure element was adjusted adaptively to the size change of LP. A viewpoint then proposed was that the gray adjustment and color recognition modules could be employed according to actual scene conditions. With abundant samples verified in dark hours and daytime in real conditions, the experiment indicates that it is feasible to adopt this algorithm in LP recognition system to achieve both accuracy and adaptability.
%K license plate recognition
%K license plate orientation
%K image processing
%K edge characteristic
%K adaptability<br>车牌识别
%K 车牌定位
%K 图像处理
%K 边缘特征
%K 自适应性
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=8240383F08CE46C8B05036380D75B607&jid=D06194629680C940ACE75262F54B9D85&aid=2B25C2E0CDC8954CA9889D321DD8AF3C&yid=DE12191FBD62783C&vid=F3583C8E78166B9E&iid=F3090AE9B60B7ED1&sid=EA437CDB73D9759D&eid=36250D1D6BDC99BD&journal_id=1006-8961&journal_name=中国图象图形学报&referenced_num=0&reference_num=7