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中文摘要：
车牌定位是车牌识别的基础．文中提出了一种准确快速的车牌定位方法．该方法利用三级阈值，由粗到细，首先剔除大量非角点像素，提高角点的定位速度，用大阈值突出显示车牌区域的角点，再根据车牌纹理的角点特性，利用滑动窗粗选车牌区域，然后对粗选车牌区域用小阈值，对车牌区域进行精确定位．试验证实该方法的车牌定位准确率达到98％，平均耗时约20ms．
英文摘要：
A method for locating the license plate with high speed and great accuracy is put forward for the license plate recognition. In the locating process, a system of three-level thresholds, ranging from roughness to fineness, is adopted to eliminate a number of non-corner pixels first, which speeds up the locating of the plate corners. Then, a big corner detection threshold is used to foreground the corners in the license plate region, and a slid window is used to approximately detect the license plate. Finally, the detected plate is accurately located using a smaller corner detection threshold. Experimental results show that, by the proposed method, the locating accuracy is rated at 98% and the time cost is reduced to about 20ms.
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